Historical Weather Data

Observations began July 2015

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Temperature graph UV Index graph Humidity graph Dew point graph Wind direction graph Wind speed graph Barometric Pressure graph Rainfall graph> Rain Rate graph> Solar Radiation graph
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Daily History

Temperature

HourHigh TempLow TempAvgHigh Heat IndexAvg Heat Index
12:00 AM51.7°50.8°51.3°51.7°51.3°
01:00 AM51.8°51.0°51.3°51.8°51.3°
02:00 AM51.5°51.0°51.2°51.5°51.2°
03:00 AM51.1°50.1°50.8°51.1°50.8°
04:00 AM50.1°48.9°49.4°50.1°49.4°
05:00 AM49.0°48.0°48.6°49.0°48.6°
06:00 AM48.8°48.2°48.5°48.8°48.5°
07:00 AM53.3°48.8°50.8°53.3°50.8°
08:00 AM56.9°53.6°55.3°56.9°55.3°
09:00 AM55.8°54.1°54.8°55.8°54.8°
10:00 AM59.0°55.6°57.1°59.0°57.1°
11:00 AM63.7°58.8°61.2°63.7°61.2°
12:00 PM64.7°59.1°61.6°64.7°61.6°
01:00 PM65.4°61.6°63.6°65.4°63.6°
02:00 PM66.9°64.2°65.7°66.9°65.7°
03:00 PM67.4°63.8°65.5°67.4°65.5°
04:00 PM68.1°63.1°66.3°68.1°66.3°
05:00 PM67.0°62.6°65.2°67.0°65.2°
SUMMARYHigh TempLow TempAvgHigh Heat IndexAvg Heat Index
Max68.1°64.2°66.3°68.1°66.3°
Min48.8°48.0°48.5°48.8°48.5°
Avg57.9°55.2°56.5°57.9°56.5°

Humidity

HourHigh HumidityLow HumidityAvg HumidityHigh Dew PointLow Dew PointAvg Dew Point
12:00 AM38%36%38%26.7°25.5°26.2°
01:00 AM41%36%38%28.5°25.5°26.8°
02:00 AM43%41%42%29.5°28.3°28.7°
03:00 AM45%42%43%29.8°28.8°29.4°
04:00 AM49%45%48%30.9°29.4°30.3°
05:00 AM51%49%50%30.9°30.3°30.7°
06:00 AM50%48%49%30.9°29.7°30.2°
07:00 AM48%39%44%30.3°28.8°29.6°
08:00 AM47%34%39%34.6°28.3°30.5°
09:00 AM46%41%43%34.2°32.0°32.9°
10:00 AM42%36%39%33.7°31.0°32.1°
11:00 AM37%26%31%33.0°26.4°30.2°
12:00 PM33%26%29%34.2°25.4°29.2°
01:00 PM36%25%27%35.3°26.9°29.2°
02:00 PM29%23%26%31.7°27.6°29.5°
03:00 PM31%21%26%33.7°25.6°29.2°
04:00 PM27%23%25%31.6°26.8°29.6°
05:00 PM27%22%25%31.0°25.8°28.3°
SUMMARYHigh HumidityLow HumidityAvg HumidityHigh Dew PointLow Dew PointAvg Dew Point
Max51%49%50%35.3°32.0°32.9°
Min27%21%25%26.7°25.4°26.2°
Avg40%34%37%31.7°27.9°29.6°

Wind

HourHigh SustainedLow SustainedAvg SustainedHigh GustLow GustAvg GustAvg DirectionWind Run
12:00 AM8.0 mph1.0 mph5.5 mph17.0 mph0.0 mph12.1 mph210° SSW5.5 mi
01:00 AM10.0 mph6.0 mph7.9 mph18.0 mph12.0 mph16.0 mph232° SW7.9 mi
02:00 AM9.0 mph7.0 mph7.8 mph16.0 mph13.0 mph15.0 mph239° WSW7.8 mi
03:00 AM9.0 mph7.0 mph7.9 mph17.0 mph15.0 mph16.4 mph236° SW7.9 mi
04:00 AM8.0 mph3.0 mph5.6 mph16.0 mph9.0 mph12.3 mph252° WSW5.6 mi
05:00 AM4.0 mph2.0 mph3.2 mph10.0 mph8.0 mph9.5 mph282° WNW3.2 mi
06:00 AM4.0 mph2.0 mph3.3 mph10.0 mph7.0 mph8.1 mph291° WNW3.3 mi
07:00 AM2.0 mph0.0 mph0.7 mph8.0 mph0.0 mph3.0 mph315° NW0.7 mi
08:00 AM2.0 mph0.0 mph1.5 mph4.0 mph0.0 mph3.2 mph338° NNW1.5 mi
09:00 AM3.0 mph1.0 mph1.9 mph4.0 mph3.0 mph3.6 mph95° E1.9 mi
10:00 AM3.0 mph2.0 mph2.6 mph7.0 mph4.0 mph5.8 mph92° E2.6 mi
11:00 AM5.0 mph2.0 mph3.3 mph8.0 mph7.0 mph7.3 mph91° E3.3 mi
12:00 PM4.0 mph1.0 mph2.7 mph8.0 mph6.0 mph6.8 mph97° E2.7 mi
01:00 PM3.0 mph1.0 mph2.4 mph7.0 mph4.0 mph5.3 mph79° ENE2.4 mi
02:00 PM5.0 mph3.0 mph3.5 mph8.0 mph7.0 mph7.8 mph78° ENE3.5 mi
03:00 PM3.0 mph2.0 mph2.9 mph8.0 mph6.0 mph7.2 mph82° E2.9 mi
04:00 PM5.0 mph2.0 mph3.2 mph8.0 mph4.0 mph6.9 mph81° E3.2 mi
05:00 PM3.0 mph2.0 mph2.4 mph6.0 mph3.0 mph5.1 mph98° E2.1 mi
SUMMARYHigh SustainedLow SustainedAvg SustainedHigh GustLow GustAvg GustAvg DirectionWind Run
Max10.0 mph7.0 mph7.9 mph18.0 mph15.0 mph16.4 mph7.9 mi
Min2.0 mph0.0 mph0.7 mph4.0 mph0.0 mph3.0 mph0.7 mi
Avg5.0 mph2.4 mph3.8 mph10.0 mph6.0 mph8.4 mph113° ESE3.8 mi
Total67.9 mi

Rain

SUMMARYLiquidSnow
Total0.00"0.0"

Pressure

HourHigh PressureLow PressureAvg Pressure
12:00 AM30.35"30.34"30.35"
01:00 AM30.34"30.33"30.34"
02:00 AM30.34"30.33"30.33"
03:00 AM30.33"30.32"30.33"
04:00 AM30.33"30.32"30.32"
05:00 AM30.33"30.32"30.32"
06:00 AM30.33"30.32"30.32"
07:00 AM30.34"30.32"30.33"
08:00 AM30.34"30.33"30.34"
09:00 AM30.34"30.32"30.33"
10:00 AM30.33"30.31"30.32"
11:00 AM30.32"30.31"30.31"
12:00 PM30.31"30.30"30.31"
01:00 PM30.31"30.29"30.30"
02:00 PM30.29"30.28"30.29"
03:00 PM30.29"30.27"30.28"
04:00 PM30.27"30.25"30.26"
05:00 PM30.25"30.24"30.24"
SUMMARYHigh PressureLow PressureAvg Pressure
Max30.35"30.34"30.35"
Min30.25"30.24"30.24"
Avg30.32"30.31"30.31"

Solar

HourHigh UVLow UVAvg UVHigh RadiationLow RadiationAvg RadiationTotal Radiation
12:00 AM0.00.00.00 W/m20 W/m20 W/m20.00 MJ/m2
01:00 AM0.00.00.00 W/m20 W/m20 W/m20.00 MJ/m2
02:00 AM0.00.00.00 W/m20 W/m20 W/m20.00 MJ/m2
03:00 AM0.00.00.00 W/m20 W/m20 W/m20.00 MJ/m2
04:00 AM0.00.00.00 W/m20 W/m20 W/m20.00 MJ/m2
05:00 AM0.00.00.00 W/m20 W/m20 W/m20.00 MJ/m2
06:00 AM0.00.00.021 W/m20 W/m29 W/m20.03 MJ/m2
07:00 AM0.50.00.1149 W/m223 W/m282 W/m20.29 MJ/m2
08:00 AM1.30.50.8371 W/m2114 W/m2201 W/m20.72 MJ/m2
09:00 AM2.51.21.8548 W/m2214 W/m2436 W/m21.57 MJ/m2
10:00 AM4.02.63.3698 W/m2552 W/m2628 W/m22.26 MJ/m2
11:00 AM6.14.04.81000 W/m2700 W/m2790 W/m22.85 MJ/m2
12:00 PM6.83.14.51129 W/m2218 W/m2594 W/m22.14 MJ/m2
01:00 PM7.53.85.01195 W/m2279 W/m2635 W/m22.28 MJ/m2
02:00 PM7.43.65.41155 W/m2336 W/m2665 W/m22.39 MJ/m2
03:00 PM6.32.94.51021 W/m2204 W/m2601 W/m22.16 MJ/m2
04:00 PM4.82.03.7858 W/m2181 W/m2587 W/m22.11 MJ/m2
05:00 PM3.01.92.3735 W/m2220 W/m2490 W/m21.59 MJ/m2
SUMMARYHigh UVLow UVAvg UVHigh RadiationLow RadiationAvg RadiationTotal Radiation
Max7.54.05.41195 W/m2700 W/m2790 W/m22.85 MJ/m2
Daytime Avg3.1489 W/m21.70 MJ/m2
Total20.40 MJ/m2
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Monthly History

Temperature

DayHigh TempLow TempAvg (NWS)AvgHDDCDDHigh Heat IndexAvg Heat Index
May 0174.8°38.5°56.5°51.6°13.40.074.8°51.6°
May 0257.1°42.5°49.5°50.2°14.80.057.1°50.2°
May 0344.3°39.8°42.0°42.1°22.90.044.3°42.1°
May 0446.9°39.5°43.5°42.5°22.50.046.9°42.5°
May 0547.3°35.8°41.5°40.6°24.40.047.3°40.6°
May 0648.6°35.9°42.5°42.8°22.20.048.6°42.8°
May 0743.7°34.2°39.0°39.4°25.60.043.7°39.4°
May 0846.5°36.6°42.0°41.7°23.30.046.5°41.7°
May 0944.9°33.7°39.5°40.1°24.90.044.9°40.1°
May 1044.3°35.2°39.5°39.7°25.30.044.3°39.7°
May 1153.7°38.4°46.0°45.7°19.30.053.7°45.7°
May 1260.6°37.6°49.5°50.0°15.00.060.6°50.0°
May 1368.1°48.0°58.0°56.5°8.50.068.1°56.5°
SUMMARYHigh TempLow TempAvg (NWS)AvgHDDCDDHigh Heat IndexAvg Heat Index
Max74.8°48.0°58.0°56.5°25.60.074.8°56.5°
Min43.7°33.7°39.0°39.4°8.50.043.7°39.4°
Avg52.4°38.1°45.1°44.6°20.20.052.4°44.6°
Total262.00.0
ThresholdsHigh TempLow Temp 
>= 900 days 
>= 800 days0 days 
<= 320 days0 days 
<= 00 days0 days 

Humidity

DayHigh HumidityLow HumidityAvg HumidityHigh Dew PointLow Dew PointAvg Dew Point
May 0173%27%50%42.3°15.1°32.6°
May 0282%45%62%42.7°33.8°37.3°
May 0397%82%91%42.6°36.1°39.7°
May 0499%68%84%41.9°32.6°37.7°
May 0584%56%72%36.5°29.8°32.2°
May 0678%34%59%35.0°20.4°29.3°
May 0791%52%73%37.0°26.0°31.0°
May 0867%48%58%33.8°25.0°27.8°
May 0972%51%63%35.1°24.3°28.5°
May 1082%55%67%33.6°24.7°29.4°
May 1180%28%52%32.9°20.3°27.4°
May 1259%25%38%29.7°18.6°24.2°
May 1357%24%42%39.2°28.7°33.1°
SUMMARYHigh HumidityLow HumidityAvg HumidityHigh Dew PointLow Dew PointAvg Dew Point
Max99%82%91%42.7°36.1°39.7°
Min57%24%38%29.7°15.1°24.2°
Avg79%46%63%37.1°25.8°31.5°

Wind

DayHigh SustainedLow SustainedAvg SustainedHigh GustLow GustAvg GustAvg DirectionWind Run
May 0117.0 mph0.0 mph6.6 mph42.0 mph0.0 mph16.3 mph215° SW159.3 mi
May 026.0 mph0.0 mph2.0 mph14.0 mph0.0 mph5.5 mph103° ESE48.5 mi
May 034.0 mph0.0 mph1.8 mph9.0 mph0.0 mph4.4 mph343° NNW42.7 mi
May 0412.0 mph3.0 mph7.2 mph25.0 mph6.0 mph16.0 mph325° NW172.3 mi
May 059.0 mph0.0 mph4.5 mph18.0 mph0.0 mph10.6 mph7° N108.1 mi
May 066.0 mph0.0 mph2.8 mph12.0 mph0.0 mph7.0 mph334° NNW66.0 mi
May 0712.0 mph0.0 mph4.8 mph24.0 mph0.0 mph11.2 mph346° NNW114.7 mi
May 087.0 mph0.0 mph3.2 mph12.0 mph0.0 mph8.0 mph32° NNE76.2 mi
May 099.0 mph0.0 mph4.2 mph19.0 mph0.0 mph9.3 mph349° NNW99.7 mi
May 1011.0 mph4.0 mph7.3 mph26.0 mph9.0 mph15.8 mph333° NNW174.7 mi
May 1112.0 mph1.0 mph6.7 mph22.0 mph2.0 mph14.7 mph331° NNW161.8 mi
May 127.0 mph0.0 mph2.4 mph11.0 mph0.0 mph5.6 mph44° NE58.4 mi
May 1310.0 mph0.0 mph3.8 mph18.0 mph0.0 mph8.4 mph113° ESE67.9 mi
SUMMARYHigh SustainedLow SustainedAvg SustainedHigh GustLow GustAvg GustAvg DirectionWind Run
Max17.0 mph4.0 mph7.3 mph42.0 mph9.0 mph16.3 mph174.7 mi
Min4.0 mph0.0 mph1.8 mph9.0 mph0.0 mph4.4 mph42.7 mi
Avg9.4 mph0.6 mph4.4 mph19.4 mph1.3 mph10.3 mph342° NNW103.9 mi
Total1350.4 mi

Rain

DayLiquidSnow
May 010.04"0.0"
May 020.00"0.0"
May 030.45"0.0"
May 040.01"0.0"
May 050.00"0.0"
May 060.00"0.0"
May 070.12"0.0"
May 080.00"0.0"
May 090.00"0.0"
May 100.00"0.0"
May 110.00"0.0"
May 120.00"0.0"
May 130.00"0.0"
SUMMARYLiquidSnow
Max0.45"0.0"
Min0.00"0.0"
Avg0.05"0.0"
Total0.62"0.0"
ThresholdsLiquidSnow
>= 0.01"4 days
>= 0.10"2 days0 days
>= 1"0 days0 days
>= 4"0 days0 days
>= 8"0 days

Pressure

DayHigh PressureLow PressureAvg Pressure
May 0130.08"29.45"29.69"
May 0229.70"29.55"29.63"
May 0329.73"29.67"29.70"
May 0429.99"29.70"29.83"
May 0530.15"29.99"30.08"
May 0630.14"30.00"30.08"
May 0730.08"29.96"30.03"
May 0830.11"30.06"30.09"
May 0930.13"30.03"30.08"
May 1030.24"30.10"30.18"
May 1130.39"30.24"30.31"
May 1230.45"30.35"30.40"
May 1330.35"30.24"30.31"
SUMMARYHigh PressureLow PressureAvg Pressure
Max30.45"30.35"30.40"
Min29.70"29.45"29.63"
Avg30.12"29.95"30.03"

Solar

DayHigh UVDaytime Avg UVHigh RadiationDaytime Avg RadiationTotal Radiation
May 016.72.4979 W/m2383 W/m219.87 MJ/m2
May 025.41.6788 W/m2250 W/m213.05 MJ/m2
May 031.40.3160 W/m243 W/m22.23 MJ/m2
May 047.91.4693 W/m2188 W/m29.82 MJ/m2
May 057.42.61071 W/m2448 W/m223.52 MJ/m2
May 067.61.91361 W/m2310 W/m216.35 MJ/m2
May 077.72.21259 W/m2368 W/m219.44 MJ/m2
May 086.82.81095 W/m2498 W/m226.44 MJ/m2
May 097.52.71308 W/m2483 W/m225.69 MJ/m2
May 107.72.21162 W/m2343 W/m218.29 MJ/m2
May 116.42.8904 W/m2507 W/m227.19 MJ/m2
May 127.03.1911 W/m2513 W/m227.52 MJ/m2
May 137.53.11195 W/m2489 W/m220.40 MJ/m2
SUMMARYHigh UVDaytime Avg UVHigh RadiationDaytime Avg RadiationTotal Radiation
Max7.93.11361 W/m2513 W/m227.52 MJ/m2
Min1.40.3160 W/m243 W/m22.23 MJ/m2
Avg6.72.2991 W/m2370 W/m219.22 MJ/m2
Total249.83 MJ/m2
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Yearly History

Temperature

MonthHigh TempLow TempAvg (NWS)AvgHDDCDDHigh Heat IndexAvg Heat IndexLow Wind ChillAvg Wind Chill
Jan38.7°4.6°24.0°24.2°1264.60.038.7°24.2°-4.3°20.2°
Feb44.2°-8.4°16.5°16.7°1352.70.044.2°16.7°-25.0°10.2°
Mar63.9°9.5°34.4°33.8°967.20.063.9°33.8°-5.8°30.2°
Apr73.3°21.5°41.6°40.8°725.80.073.3°40.8°11.4°38.7°
May74.8°33.7°45.0°44.6°262.40.074.8°44.6°29.7°42.9°
SUMMARYHigh TempLow TempAvg (NWS)AvgHDDCDDHigh Heat IndexAvg Heat IndexLow Wind ChillAvg Wind Chill
Max74.8°33.7°45.0°44.6°1352.70.074.8°44.6°29.7°42.9°
Min38.7°-8.4°16.5°16.7°262.40.038.7°16.7°-25.0°10.2°
Avg59.0°12.2°30.6°30.6°914.50.059.0°30.6°1.2°26.8°
Total4572.70.0
ThresholdsHigh TempLow Temp 
>= 900 days 
>= 800 days0 days 
<= 3245 days93 days 
<= 00 days8 days 

Humidity

MonthHigh HumidityLow HumidityAvg HumidityHigh Dew PointLow Dew PointAvg Dew Point
Jan94%50%76%32.9°-0.6°17.6°
Feb97%29%67%31.6°-19.1°7.2°
Mar100%15%65%48.7°-2.6°22.2°
Apr100%22%70%58.0°9.2°30.5°
May99%24%63%42.7°15.1°31.5°
SUMMARYHigh HumidityLow HumidityAvg HumidityHigh Dew PointLow Dew PointAvg Dew Point
Max100%50%76%58.0°15.1°31.5°
Min94%15%63%31.6°-19.1°7.2°
Avg98%28%69%42.8°0.4°20.7°

Wind

MonthHigh SustainedAvg SustainedHigh GustAvg GustAvg DirectionWind Run
Jan16.0 mph4.3 mph36.0 mph10.5 mph281° W3169.4 mi
Feb16.0 mph5.1 mph36.0 mph12.2 mph283° WNW3444.5 mi
Mar21.0 mph5.8 mph44.0 mph13.8 mph283° WNW4319.7 mi
Apr15.0 mph4.5 mph32.0 mph10.8 mph340° NNW3257.2 mi
May17.0 mph4.4 mph42.0 mph10.3 mph342° NNW1348.2 mi
SUMMARYHigh SustainedAvg SustainedHigh GustAvg GustAvg DirectionWind Run
Max21.0 mph5.8 mph44.0 mph13.8 mph4319.7 mi
Min15.0 mph4.3 mph32.0 mph10.3 mph1348.2 mi
Avg17.0 mph4.9 mph38.0 mph11.7 mph296° WNW3343.2 mi
Total15539.0 mi

Rain

MonthLiquidSnow
Jan0.72"10.4"
Feb1.31"16.1"
Mar1.85"5.3"
Apr3.27"1.8"
May0.62"0.0"
SUMMARYLiquidSnow
Max3.27"16.1"
Min0.62"0.0"
Avg1.55"6.7"
Total7.77"33.6"
ThresholdsLiquidSnow
>= 0.01"49 days
>= 0.10"22 days29 days
>= 1"0 days11 days
>= 4"0 days2 days
>= 8"0 days

Pressure

MonthHigh PressureLow PressureAvg Pressure
Jan30.60"29.27"30.03"
Feb30.50"29.12"30.06"
Mar30.62"29.31"30.08"
Apr30.55"29.45"29.93"
May30.45"29.45"30.02"
SUMMARYHigh PressureLow PressureAvg Pressure
Max30.62"29.45"30.08"
Min30.45"29.12"29.93"
Avg30.55"29.32"30.02"

Solar

MonthHigh UVDaytime Avg UVHigh RadiationDaytime Avg RadiationTotal Radiation
Jan1.60.3642 W/m2108 W/m2109.81 MJ/m2
Feb2.80.7788 W/m2207 W/m2215.93 MJ/m2
Mar5.51.21056 W/m2239 W/m2319.70 MJ/m2
Apr6.11.51132 W/m2282 W/m2414.51 MJ/m2
May7.92.21361 W/m2369 W/m2248.23 MJ/m2
SUMMARYHigh UVDaytime Avg UVHigh RadiationDaytime Avg RadiationTotal Radiation
Max7.92.21361 W/m2369 W/m2414.51 MJ/m2
Min1.60.3642 W/m2108 W/m2109.81 MJ/m2
Avg4.81.1996 W/m2224 W/m2261.64 MJ/m2
Total1308.18 MJ/m2
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Marquette, MI Normals

Month TempHi TempLo TempAv Depart Rain Snow
January 25.0° F 12.5° F 18.8° F -0.5° F 1.83" 29.5"
February 27.8° F 13.6° F 20.7° F -0.1° F 1.31" 20.7"
March 35.9° F 22.1° F 29.0° F 0.1° F 2.00" 21.7"
April 47.3° F 32.9° F 40.1° F 0.8° F 2.45" 7.5"
May 59.4° F 42.6° F 51.0° F 3.2° F 2.53" 0.6"
June 68.3° F 51.5° F 59.9° F 3.0° F 2.68" 0.0"
July 74.5° F 58.6° F 66.6° F 1.8° F 2.82" 0.0"
August 74.2° F 59.0° F 66.6° F 0.5° F 2.63" 0.0"
September 66.8° F 52.0° F 59.4° F 0.6° F 3.16" 0.0"
October 53.9° F 40.6° F 47.3° F -0.3° F 3.13" 1.0"
November 40.3° F 29.3° F 34.8° F -0.4° F 2.62" 10.9"
December 29.1° F 18.0° F 23.5° F -0.5° F 1.97" 25.3"
SUMMARY TempHi TempLo TempAv Depart Rain Snow
Avg 50.2° F 36.0° F 43.1° F 0.68
Total 29.13" 117.2"
Based on official Marquette NOAA COOP station averages 1981-2010
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Station Records


marquetteweather.com

Highest recorded temperature: 93.8 °F on Jul 25, 2020
Lowest recorded temperature: -14.7 °F on Jan 31, 2019
Total recorded temperature range: 108.5 °F

Highest recorded pressure: 30.83 inHg on Jan 13, 2017
Lowest recorded pressure: 28.78 inHg on Dec 24, 2015
Total recorded pressure range: 2.05 inHg

Highest recorded wind speed: 51.0 MPH on Feb 24, 2019

Wettest day on record: Sep 5, 2018 with 3.11 in of rain.

Sunniest day on record: Jun 14, 2020 with 12.1 hours of sunshine.

Official Weather Data

Forecast Accuracy

Check the accuracy of forecasted temperatures

* * * * *

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Notes:

General

  • The above data, with the exception of normals, are produced by a private weather station located 1/4 mile south of downtown Marquette. The station went online July 10, 2015.
  • If you're seeking official weather data for the Marquette COOP station (1857 - present), please visit NOAA NOWData.
  • Graphs at the top are linked to larger, more detailed views that in some cases add information. These larger versions update every 5 minutes. Smaller graphs are updated every minute.
  • Daily and monthly history tables are updated every 5 minutes. Yearly histories are updated at the top of every hour.

Temperatures

  • "NWS" averages are the sum of the daily high temperature & daily low temperature in whole degrees divided by 2. This is the National Weather Service method used for climatological summaries. All other fields labelled "Avg" contain integrated averages using one minute samples. "Avg" labelled summary columns contain weighted means (i.e. a partial hour/day/month counts less than a full one).
  • CDD = Cooling Degree Days & HDD = Heating Degree Days. Degree days are calculated using daily integrated averages of 1 minute samples compared to a base value of 65°. For example, a day with an avg temperature of 67.7° will have 2.7 CDDs & 0 HDDs. A 33.2° avg temperature will produce 31.8 HDDs & 0 CDDs.
  • In the daily & monthly history tables, "Wind Chill" appears only October through April. It is calculated when the temperature is 45 or below and sustained wind speed is at least 3 mph. Otherwise, it equals the temperature. Likewise, "Heat Index" appears only May through September. It is calculated only when the temperature is 80 or above. Otherwise, it equals the temperature.

Wind

  • "Sustained" wind is the rolling 10 minute average sustained wind speed.
  • "Wind Dir" is a scalar average of direction irrespective of speed. However, calm winds do not have a valid direction and are not included in the average.
  • "Wind Run" uses the 10 minute wind average.
  • "Low Sustained" & "Low Max" wind values are omitted from the yearly history table since every field equals 0.
  • Anemometer (wind gauge) was raised from 20 ft to 28 ft on June 18, 2017

Humidity / Dew Point

  • As of July 2018 daily, monthly, and yearly history tables contain corrected humidities and dew points. A custom correction curve addresses a dry bias above 95% and a wet bias below 92% inherent to the sensor. A third-party device accurate to within 2% humidity established the deltas used in the algorithm. The daily table contains up-to-date corrections for today. The monthly and yearly tables have corrections through yesterday (updated just after midnight each morning).
  • The smaller embedded 24 hour graphs contain uncorrected humidities & dew points. The detailed, larger graphics (available by clicking image) contain corrected values.

Precipitation

  • "Liquid" precipitation in the winter is the amount of melted snow and/or ice.
  • Daily snowfall record keeping began in October 2017.
  • Starting in the fall of 2019 snowfall measurements for the current season also appear on the Snow Measurements page. This is where you will find break outs of all intraday measurements & estimates when measurement was insufficient or impossible.
  • Snowfall measurements occur as time, health, and weather permits.
  • The daily precipitation table doesn't contain hourly reports because often we correct the total with a measurement from our manual gauge. Unfortunately, when that happens, we have no way of reconstructing hourly amounts. For a raw, uncorrected breakdown of rain over the past 24 hours please see the precipitation graph at the top of the page.

Pressure

  • Since January 15, 2018, pressure is recorded in altimeter format. The home page, however, continues to display "Barometer" in MSLP format by default.

Solar

  • UV index measurement began June 6, 2020. Sensor detects ultraviolet radiation at wavelengths of 290 to 390 nm. Scale is 0-16 (but never gets above 11 in Marquette).
  • Solar radiation measurement began June 11, 2020. Scale for solar radiation is 0 - 1800 Watts per meter squared. This measurement of the sun's energy (detected between 300 and 1100 nanometers wavelength) can approximate daylight cloud cover relative to clear days for a given time of year. It's also useful for determining solar electricity generation and aerosol levels (pollution, smoke, dust, ash, etc).
  • The daily table summary footer for this tab omits "Min" since every value is always 0. Instead you'll see a "Daytime Avg" row displaying weighted averages of all hourly maximums, minimums, and averages between sunrise & sunset.
  • In monthly & yearly tables, you'll see a "Daytime Avg" column containing daylight averages. The "Min" column will be entirely missing since every value would be 0.
  • Total Radiation is measured in Megajoules (1,000,000 J) per meter squared.

Normals

  • "Depart" in the Normals table refers to the average departure (or difference) between our weather station and the official Marquette average temperature recorded at the Water Filtration Plant on Lakeshore Dr. These numbers are updated monthly based on data beginning August 2015 (first full month of data collection).
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