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 AM69.7°68.2°69.0°69.7°69.0°
01:00 AM68.4°67.5°68.0°68.4°68.0°
02:00 AM67.7°66.3°67.0°67.7°67.0°
03:00 AM66.4°65.5°66.0°66.4°66.0°
04:00 AM66.0°65.6°65.8°66.0°65.8°
05:00 AM66.5°65.6°66.1°66.5°66.1°
06:00 AM66.5°65.7°66.2°66.5°66.2°
07:00 AM67.6°66.5°67.1°67.6°67.1°
08:00 AM68.7°67.3°67.9°68.7°67.9°
09:00 AM70.8°68.8°69.8°70.8°69.8°
10:00 AM76.1°70.9°74.2°76.1°74.2°
11:00 AM79.3°76.4°77.9°79.3°77.9°
12:00 PM81.4°78.8°80.1°81.2°80.1°
01:00 PM82.9°80.7°81.9°82.0°81.3°
02:00 PM83.8°82.0°83.0°82.8°81.9°
03:00 PM84.2°81.9°83.3°82.9°82.2°
04:00 PM84.1°82.9°83.6°83.1°82.6°
05:00 PM84.2°82.3°83.0°83.4°82.1°
06:00 PM82.3°78.7°80.0°81.4°79.9°
07:00 PM79.6°78.7°79.2°79.6°79.2°
SUMMARYHigh TempLow TempAvgHigh Heat IndexAvg Heat Index
Max84.2°82.9°83.6°83.4°82.6°
Min66.0°65.5°65.8°66.0°65.8°
Avg74.8°73.0°73.8°74.5°73.5°

Humidity

HourHigh HumidityLow HumidityAvg HumidityHigh Dew PointLow Dew PointAvg Dew Point
12:00 AM67%62%64%57.0°55.4°56.1°
01:00 AM67%65%65%57.0°55.3°55.8°
02:00 AM68%65%66%55.7°54.8°55.3°
03:00 AM69%67%68%55.5°54.8°55.2°
04:00 AM69%68%68%55.4°54.8°55.1°
05:00 AM69%67%68%55.4°54.8°55.1°
06:00 AM68%65%67%55.2°54.2°54.9°
07:00 AM65%64%65%55.3°54.3°54.8°
08:00 AM67%65%66%57.2°55.1°56.1°
09:00 AM65%63%64%58.4°56.4°57.2°
10:00 AM65%52%57%59.1°56.9°58.2°
11:00 AM55%44%50%59.8°55.4°57.4°
12:00 PM46%40%43%57.8°54.1°55.5°
01:00 PM43%36%39%57.2°52.4°54.5°
02:00 PM40%34%36%55.9°51.9°53.6°
03:00 PM39%35%37%56.0°52.1°54.1°
04:00 PM42%36%38%58.0°53.7°55.3°
05:00 PM41%37%38%57.2°53.5°55.1°
06:00 PM48%37%42%57.4°53.1°55.1°
07:00 PM47%47%47%57.6°56.8°57.2°
SUMMARYHigh HumidityLow HumidityAvg HumidityHigh Dew PointLow Dew PointAvg Dew Point
Max69%68%68%59.8°56.9°58.2°
Min39%34%36%55.2°51.9°53.6°
Avg57%52%55%56.9°54.5°55.5°

Wind

HourHigh SustainedLow SustainedAvg SustainedHigh GustLow GustAvg GustAvg DirectionWind Run
12:00 AM7.0 mph4.0 mph5.4 mph15.0 mph10.0 mph13.2 mph222° SW5.4 mi
01:00 AM6.0 mph4.0 mph4.7 mph14.0 mph9.0 mph12.2 mph219° SW4.7 mi
02:00 AM6.0 mph4.0 mph4.7 mph13.0 mph9.0 mph11.1 mph223° SW4.7 mi
03:00 AM5.0 mph4.0 mph4.4 mph10.0 mph8.0 mph9.7 mph229° SW4.4 mi
04:00 AM5.0 mph4.0 mph4.4 mph10.0 mph8.0 mph9.2 mph232° SW4.4 mi
05:00 AM6.0 mph4.0 mph4.7 mph10.0 mph9.0 mph9.6 mph232° SW4.7 mi
06:00 AM6.0 mph4.0 mph4.9 mph11.0 mph9.0 mph10.0 mph229° SW4.9 mi
07:00 AM5.0 mph4.0 mph4.3 mph9.0 mph8.0 mph9.0 mph226° SW4.3 mi
08:00 AM4.0 mph3.0 mph3.5 mph12.0 mph7.0 mph9.4 mph217° SW3.5 mi
09:00 AM5.0 mph4.0 mph4.5 mph12.0 mph9.0 mph10.2 mph231° SW4.4 mi
10:00 AM6.0 mph4.0 mph5.0 mph16.0 mph10.0 mph13.1 mph223° SW5.0 mi
11:00 AM7.0 mph4.0 mph5.5 mph20.0 mph9.0 mph15.2 mph204° SSW5.5 mi
12:00 PM7.0 mph4.0 mph5.7 mph20.0 mph10.0 mph13.7 mph198° SSW5.7 mi
01:00 PM7.0 mph5.0 mph5.9 mph16.0 mph13.0 mph14.9 mph192° SSW5.9 mi
02:00 PM8.0 mph4.0 mph5.9 mph19.0 mph11.0 mph14.8 mph191° S5.9 mi
03:00 PM7.0 mph6.0 mph6.6 mph19.0 mph13.0 mph16.7 mph191° S6.6 mi
04:00 PM8.0 mph5.0 mph6.4 mph19.0 mph13.0 mph16.2 mph186° S6.4 mi
05:00 PM6.0 mph3.0 mph4.9 mph19.0 mph12.0 mph16.9 mph175° S4.9 mi
06:00 PM6.0 mph4.0 mph4.8 mph21.0 mph10.0 mph15.3 mph171° S4.8 mi
07:00 PM6.0 mph4.0 mph4.9 mph14.0 mph10.0 mph12.9 mph175° S1.6 mi
SUMMARYHigh SustainedLow SustainedAvg SustainedHigh GustLow GustAvg GustAvg DirectionWind Run
Max8.0 mph6.0 mph6.6 mph21.0 mph13.0 mph16.9 mph6.6 mi
Min4.0 mph3.0 mph3.5 mph9.0 mph7.0 mph9.0 mph1.6 mi
Avg6.2 mph4.1 mph5.1 mph14.9 mph9.9 mph12.7 mph210° SSW4.9 mi
Total97.6 mi

Rain

SUMMARYLiquidSnow
Total0.00"0.0"

Pressure

HourHigh PressureLow PressureAvg Pressure
12:00 AM30.08"30.07"30.08"
01:00 AM30.09"30.08"30.09"
02:00 AM30.10"30.09"30.09"
03:00 AM30.10"30.09"30.10"
04:00 AM30.11"30.10"30.11"
05:00 AM30.12"30.11"30.12"
06:00 AM30.13"30.12"30.12"
07:00 AM30.14"30.13"30.13"
08:00 AM30.14"30.14"30.14"
09:00 AM30.14"30.13"30.13"
10:00 AM30.13"30.12"30.13"
11:00 AM30.13"30.12"30.12"
12:00 PM30.13"30.11"30.12"
01:00 PM30.11"30.09"30.10"
02:00 PM30.09"30.06"30.08"
03:00 PM30.07"30.06"30.07"
04:00 PM30.07"30.06"30.06"
05:00 PM30.06"30.05"30.06"
06:00 PM30.06"30.05"30.06"
07:00 PM30.06"30.06"30.06"
SUMMARYHigh PressureLow PressureAvg Pressure
Max30.14"30.14"30.14"
Min30.06"30.05"30.06"
Avg30.10"30.09"30.10"

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 AM0.00.00.012 W/m20 W/m23 W/m20.01 MJ/m2
07:00 AM0.00.00.091 W/m214 W/m247 W/m20.17 MJ/m2
08:00 AM0.90.00.4174 W/m286 W/m2108 W/m20.39 MJ/m2
09:00 AM2.10.91.2309 W/m2155 W/m2198 W/m20.70 MJ/m2
10:00 AM4.22.33.4682 W/m2388 W/m2573 W/m22.06 MJ/m2
11:00 AM6.04.25.1752 W/m2642 W/m2700 W/m22.52 MJ/m2
12:00 PM7.45.96.8831 W/m2749 W/m2799 W/m22.88 MJ/m2
01:00 PM8.06.97.7870 W/m2835 W/m2850 W/m23.06 MJ/m2
02:00 PM7.97.47.8860 W/m2826 W/m2845 W/m23.04 MJ/m2
03:00 PM7.63.46.2958 W/m2144 W/m2678 W/m22.44 MJ/m2
04:00 PM6.43.35.2868 W/m2174 W/m2697 W/m22.51 MJ/m2
05:00 PM4.62.33.2814 W/m2492 W/m2586 W/m22.11 MJ/m2
06:00 PM2.20.91.3489 W/m2107 W/m2225 W/m20.81 MJ/m2
07:00 PM1.00.80.9325 W/m2172 W/m2249 W/m20.28 MJ/m2
SUMMARYHigh UVLow UVAvg UVHigh RadiationLow RadiationAvg RadiationTotal Radiation
Max8.07.47.8958 W/m2835 W/m2850 W/m23.06 MJ/m2
Daytime Avg3.8504 W/m21.64 MJ/m2
Total22.98 MJ/m2
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Monthly History

Temperature

DayHigh TempLow TempAvg (NWS)AvgHDDCDDHigh Heat IndexAvg Heat Index
Aug 0182.0°58.8°70.5°70.3°0.05.382.3°70.3°
Aug 0268.1°54.8°61.5°60.2°4.80.068.1°60.2°
Aug 0363.7°55.4°59.5°59.2°5.80.063.7°59.2°
Aug 0463.1°52.2°57.5°58.0°7.00.063.1°58.0°
Aug 0573.0°48.7°61.0°61.9°3.10.073.0°61.9°
Aug 0679.7°61.9°71.0°69.7°0.04.779.7°69.7°
Aug 0784.2°65.5°74.5°73.8°0.08.884.4°73.8°
SUMMARYHigh TempLow TempAvg (NWS)AvgHDDCDDHigh Heat IndexAvg Heat Index
Max84.2°65.5°74.5°73.8°7.08.884.4°73.8°
Min63.1°48.7°57.5°58.0°0.00.063.1°58.0°
Avg73.4°56.8°64.8°64.5°2.92.773.5°64.5°
Total20.618.8
ThresholdsHigh TempLow Temp 
>= 900 days 
>= 802 days0 days 
<= 320 days0 days 
<= 00 days0 days 

Humidity

DayHigh HumidityLow HumidityAvg HumidityHigh Dew PointLow Dew PointAvg Dew Point
Aug 0186%40%68%64.5°53.7°58.6°
Aug 0294%68%86%62.4°47.7°55.8°
Aug 0377%62%71%53.4°46.5°49.8°
Aug 0489%57%74%54.1°46.2°49.5°
Aug 0580%47%64%57.0°41.3°49.1°
Aug 0671%40%58%60.1°50.0°53.9°
Aug 0774%40%60%62.7°56.2°58.5°
SUMMARYHigh HumidityLow HumidityAvg HumidityHigh Dew PointLow Dew PointAvg Dew Point
Max94%68%86%64.5°56.2°58.6°
Min71%40%58%53.4°41.3°49.1°
Avg82%51%69%59.2°48.8°53.5°

Wind

DayHigh SustainedLow SustainedAvg SustainedHigh GustLow GustAvg GustAvg DirectionWind Run
Aug 017.0 mph0.0 mph1.9 mph15.0 mph0.0 mph5.4 mph139° SE45.9 mi
Aug 028.0 mph0.0 mph5.4 mph19.0 mph0.0 mph13.8 mph347° NNW128.4 mi
Aug 038.0 mph2.0 mph4.1 mph17.0 mph4.0 mph11.7 mph8° N97.5 mi
Aug 049.0 mph1.0 mph4.2 mph16.0 mph2.0 mph10.2 mph337° NNW100.3 mi
Aug 055.0 mph0.0 mph1.9 mph12.0 mph0.0 mph5.3 mph280° W45.4 mi
Aug 065.0 mph0.0 mph2.6 mph12.0 mph0.0 mph7.5 mph303° WNW61.3 mi
Aug 078.0 mph3.0 mph5.1 mph21.0 mph7.0 mph12.7 mph210° SSW97.6 mi
SUMMARYHigh SustainedLow SustainedAvg SustainedHigh GustLow GustAvg GustAvg DirectionWind Run
Max9.0 mph3.0 mph5.4 mph21.0 mph7.0 mph13.8 mph128.4 mi
Min5.0 mph0.0 mph1.9 mph12.0 mph0.0 mph5.3 mph45.4 mi
Avg7.1 mph0.9 mph3.5 mph16.0 mph1.9 mph9.4 mph332° NNW82.3 mi
Total576.4 mi

Rain

DayLiquidSnow
Aug 010.00"0.0"
Aug 020.25"0.0"
Aug 030.00"0.0"
Aug 040.01"0.0"
Aug 050.00"0.0"
Aug 060.00"0.0"
Aug 070.00"0.0"
SUMMARYLiquidSnow
Max0.25"0.0"
Min0.00"0.0"
Avg0.04"0.0"
Total0.26"0.0"
ThresholdsLiquidSnow
>= 0.01"2 days
>= 0.10"1 day0 days
>= 1"0 days0 days
>= 4"0 days0 days
>= 8"0 days

Pressure

DayHigh PressureLow PressureAvg Pressure
Aug 0130.00"29.88"29.93"
Aug 0230.09"29.88"29.97"
Aug 0330.18"30.08"30.14"
Aug 0430.16"30.07"30.12"
Aug 0530.08"30.01"30.04"
Aug 0630.11"30.04"30.08"
Aug 0730.14"30.05"30.10"
SUMMARYHigh PressureLow PressureAvg Pressure
Max30.18"30.08"30.14"
Min30.00"29.88"29.93"
Avg30.11"30.00"30.05"

Solar

DayHigh UVDaytime Avg UVHigh RadiationDaytime Avg RadiationTotal Radiation
Aug 018.53.51055 W/m2478 W/m225.51 MJ/m2
Aug 023.50.7339 W/m287 W/m24.61 MJ/m2
Aug 038.22.71129 W/m2412 W/m221.88 MJ/m2
Aug 048.42.91134 W/m2440 W/m223.25 MJ/m2
Aug 058.13.3997 W/m2476 W/m225.12 MJ/m2
Aug 067.83.1953 W/m2430 W/m222.63 MJ/m2
Aug 078.03.8958 W/m2504 W/m222.98 MJ/m2
SUMMARYHigh UVDaytime Avg UVHigh RadiationDaytime Avg RadiationTotal Radiation
Max8.53.81134 W/m2504 W/m225.51 MJ/m2
Min3.50.7339 W/m287 W/m24.61 MJ/m2
Avg7.52.9938 W/m2402 W/m220.85 MJ/m2
Total145.96 MJ/m2
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Yearly History

Temperature

MonthHigh TempLow TempAvg (NWS)AvgHDDCDDHigh Heat IndexAvg Heat IndexLow Wind ChillAvg Wind Chill
Jan38.4°3.8°24.8°24.9°1243.80.038.4°24.9°-6.8°20.6°
Feb53.5°-1.7°21.8°22.2°1241.40.053.5°22.2°-13.3°16.2°
Mar57.5°9.2°32.0°31.8°1027.40.057.5°31.8°6.7°28.0°
Apr62.2°18.2°37.0°36.2°862.70.062.2°36.2°10.3°33.6°
May90.4°24.1°50.4°50.0°485.318.991.3°50.0°13.1°48.7°
Jun90.8°39.9°65.0°64.5°118.7102.995.3°64.5°37.5°64.5°
Jul93.8°54.9°71.5°71.1°13.4203.7103.3°71.4°54.9°71.1°
Aug84.2°48.7°64.8°64.4°20.618.784.4°64.4°48.7°64.4°
SUMMARYHigh TempLow TempAvg (NWS)AvgHDDCDDHigh Heat IndexAvg Heat IndexLow Wind ChillAvg Wind Chill
Max93.8°54.9°71.5°71.1°1243.8203.7103.3°71.4°54.9°71.1°
Min38.4°-1.7°21.8°22.2°13.40.038.4°22.2°-13.3°16.2°
Avg71.4°24.6°43.8°43.8°626.643.073.2°43.8°18.9°41.4°
Total5013.2344.1
ThresholdsHigh TempLow Temp 
>= 904 days 
>= 8029 days0 days 
<= 3246 days116 days 
<= 00 days3 days 

Humidity

MonthHigh HumidityLow HumidityAvg HumidityHigh Dew PointLow Dew PointAvg Dew Point
Jan100%46%77%33.0°-2.4°18.5°
Feb94%27%64%31.0°-11.2°11.3°
Mar98%33%71%37.0°3.2°23.0°
Apr100%18%63%44.0°3.0°24.0°
May100%16%62%67.0°7.2°36.5°
Jun100%25%63%70.5°31.7°50.2°
Jul97%34%70%74.4°46.2°60.5°
Aug94%40%69%64.5°41.3°53.5°
SUMMARYHigh HumidityLow HumidityAvg HumidityHigh Dew PointLow Dew PointAvg Dew Point
Max100%46%77%74.4°46.2°60.5°
Min94%16%62%31.0°-11.2°11.3°
Avg98%30%67%52.7°14.9°32.8°

Wind

MonthHigh SustainedAvg SustainedHigh GustAvg GustAvg DirectionWind Run
Jan16.0 mph4.5 mph38.0 mph11.1 mph283° WNW3350.7 mi
Feb19.0 mph5.6 mph42.0 mph13.4 mph283° WNW3922.0 mi
Mar20.0 mph5.1 mph41.0 mph12.4 mph267° W3815.4 mi
Apr19.0 mph4.6 mph35.0 mph10.9 mph322° NW3329.0 mi
May14.0 mph3.9 mph28.0 mph9.6 mph5° N2912.8 mi
Jun15.0 mph3.7 mph35.0 mph9.9 mph239° WSW2690.4 mi
Jul15.0 mph3.2 mph45.0 mph8.6 mph276° W2365.9 mi
Aug9.0 mph3.5 mph21.0 mph9.4 mph332° NNW574.8 mi
SUMMARYHigh SustainedAvg SustainedHigh GustAvg GustAvg DirectionWind Run
Max20.0 mph5.6 mph45.0 mph13.4 mph3922.0 mi
Min9.0 mph3.2 mph21.0 mph8.6 mph574.8 mi
Avg15.9 mph4.3 mph35.6 mph10.8 mph291° WNW3118.4 mi
Total22960.9 mi

Rain

MonthLiquidSnow
Jan2.54"29.6"
Feb0.83"10.9"
Mar3.37"9.3"
Apr3.05"17.3"
May2.06"1.3"
Jun3.40"0.0"
Jul5.74"0.0"
Aug0.26"0.0"
SUMMARYLiquidSnow
Max5.74"29.6"
Min0.26"0.0"
Avg2.66"8.6"
Total21.25"68.4"
ThresholdsLiquidSnow
>= 0.01"81 days
>= 0.10"38 days36 days
>= 1"4 days18 days
>= 4"0 days5 days
>= 8"2 days

Pressure

MonthHigh PressureLow PressureAvg Pressure
Jan30.79"29.30"30.03"
Feb30.61"29.22"29.97"
Mar30.77"29.35"30.02"
Apr30.26"29.38"29.91"
May30.31"29.39"30.04"
Jun30.50"29.04"29.94"
Jul30.21"29.57"29.95"
Aug30.18"29.88"30.05"
SUMMARYHigh PressureLow PressureAvg Pressure
Max30.79"29.88"30.05"
Min30.18"29.04"29.91"
Avg30.45"29.39"29.98"

Solar

MonthHigh UVDaytime Avg UVHigh RadiationDaytime Avg RadiationTotal Radiation
Jan0.00.00 W/m20 W/m20.00 MJ/m2
Feb0.00.00 W/m20 W/m20.00 MJ/m2
Mar0.00.00 W/m20 W/m20.00 MJ/m2
Apr0.00.00 W/m20 W/m20.00 MJ/m2
May0.00.00 W/m20 W/m20.00 MJ/m2
Jun10.82.41151 W/m2269 W/m2457.60 MJ/m2
Jul9.83.11179 W/m2393 W/m2674.65 MJ/m2
Aug8.52.91134 W/m2402 W/m2145.67 MJ/m2
SUMMARYHigh UVDaytime Avg UVHigh RadiationDaytime Avg RadiationTotal Radiation
Max10.83.11179 W/m2402 W/m2674.65 MJ/m2
Min0.00.00 W/m20 W/m20.00 MJ/m2
Avg3.60.8433 W/m2104 W/m2159.74 MJ/m2
Total1277.92 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 -0.4° 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 0.2° 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 0.7° 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 0.71
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 7, 2020 with 23.6 hours of sunshine.

Official Records

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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