Historical Weather Data

Observations began July 2015

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Last 24 hours


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Daily History

Temperature

HourHigh TempLow TempAvgLow Wind ChillAvg Wind Chill
12:00 AM43.7°42.5°43.3°42.5°43.3°
01:00 AM43.6°41.6°42.7°38.9°41.8°
02:00 AM44.3°41.5°43.1°41.5°43.1°
03:00 AM44.5°42.7°43.7°41.0°43.2°
04:00 AM42.9°41.4°42.1°41.4°42.1°
05:00 AM41.8°39.8°40.5°39.8°40.6°
06:00 AM44.7°39.8°41.8°36.1°39.8°
07:00 AM40.6°39.2°39.7°36.0°39.3°
08:00 AM46.1°40.1°42.6°40.1°42.4°
09:00 AM50.6°46.2°48.9°44.1°47.1°
10:00 AM50.8°49.9°50.4°47.1°50.3°
SUMMARYHigh TempLow TempAvgLow Wind ChillAvg Wind Chill
Max50.8°49.9°50.4°47.1°50.3°
Min40.6°39.2°39.7°36.0°39.3°
Avg44.9°42.2°43.1°40.8°42.5°

Humidity

HourHigh HumidityLow HumidityAvg HumidityHigh Dew PointLow Dew PointAvg Dew Point
12:00 AM76%60%65%35.6°30.5°32.4°
01:00 AM82%77%78%37.2°35.5°36.4°
02:00 AM84%72%79%37.9°35.8°37.0°
03:00 AM77%71%74%36.4°35.5°36.0°
04:00 AM82%77%79%36.7°35.2°35.9°
05:00 AM88%80%85%36.9°35.4°36.2°
06:00 AM90%76%83%38.6°35.1°36.9°
07:00 AM90%84%87%37.2°35.5°36.3°
08:00 AM88%71%81%37.8°36.3°37.0°
09:00 AM71%62%65%38.2°37.0°37.6°
10:00 AM62%61%61%38.2°37.1°37.7°
SUMMARYHigh HumidityLow HumidityAvg HumidityHigh Dew PointLow Dew PointAvg Dew Point
Max90%84%87%38.6°37.1°37.7°
Min62%60%61%35.6°30.5°32.4°
Avg81%72%77%37.3°35.4°36.2°

Wind

HourHigh SustainedLow SustainedAvg SustainedHigh GustLow GustAvg GustAvg DirectionWind Run
12:00 AM3.0 mph1.0 mph1.8 mph7.0 mph3.0 mph5.0 mph294° WNW1.8 mi
01:00 AM6.0 mph1.0 mph2.8 mph12.0 mph4.0 mph8.6 mph133° SE2.8 mi
02:00 AM2.0 mph1.0 mph1.7 mph7.0 mph0.0 mph4.7 mph96° E1.7 mi
03:00 AM4.0 mph2.0 mph3.2 mph10.0 mph5.0 mph8.7 mph136° SE3.2 mi
04:00 AM2.0 mph1.0 mph1.9 mph7.0 mph5.0 mph5.2 mph142° SE1.9 mi
05:00 AM2.0 mph0.0 mph1.0 mph5.0 mph0.0 mph3.2 mph120° ESE1.0 mi
06:00 AM7.0 mph1.0 mph3.9 mph15.0 mph3.0 mph9.4 mph323° NW3.9 mi
07:00 AM6.0 mph0.0 mph1.7 mph13.0 mph0.0 mph4.8 mph320° NW1.7 mi
08:00 AM4.0 mph1.0 mph2.4 mph10.0 mph0.0 mph6.4 mph331° NNW2.4 mi
09:00 AM7.0 mph4.0 mph6.3 mph13.0 mph10.0 mph12.6 mph325° NW6.3 mi
10:00 AM7.0 mph5.0 mph6.3 mph14.0 mph13.0 mph13.4 mph347° NNW2.0 mi
SUMMARYHigh SustainedLow SustainedAvg SustainedHigh GustLow GustAvg GustAvg DirectionWind Run
Max7.0 mph5.0 mph6.3 mph15.0 mph13.0 mph13.4 mph6.3 mi
Min2.0 mph0.0 mph1.0 mph5.0 mph0.0 mph3.2 mph1.0 mi
Avg4.5 mph1.5 mph2.8 mph10.3 mph3.9 mph7.1 mph53° NE2.6 mi
Total28.6 mi

Rain

SUMMARYLiquidSnow
Total0.00"0.0"

Pressure

HourHigh PressureLow PressureAvg Pressure
12:00 AM29.73"29.70"29.72"
01:00 AM29.70"29.64"29.66"
02:00 AM29.64"29.61"29.62"
03:00 AM29.61"29.59"29.60"
04:00 AM29.60"29.58"29.59"
05:00 AM29.58"29.57"29.58"
06:00 AM29.61"29.58"29.60"
07:00 AM29.63"29.61"29.62"
08:00 AM29.65"29.63"29.65"
09:00 AM29.67"29.65"29.66"
10:00 AM29.68"29.66"29.67"
SUMMARYHigh PressureLow PressureAvg Pressure
Max29.73"29.70"29.72"
Min29.58"29.57"29.58"
Avg29.65"29.62"29.63"

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 AM0.00.00.00 W/m20 W/m20 W/m20.00 MJ/m2
07:00 AM0.00.00.047 W/m20 W/m220 W/m20.07 MJ/m2
08:00 AM0.70.00.3202 W/m242 W/m2115 W/m20.42 MJ/m2
09:00 AM1.60.71.0348 W/m262 W/m2172 W/m20.62 MJ/m2
10:00 AM2.11.61.9496 W/m2380 W/m2465 W/m20.53 MJ/m2
SUMMARYHigh UVLow UVAvg UVHigh RadiationLow RadiationAvg RadiationTotal Radiation
Max2.11.61.9496 W/m2380 W/m2465 W/m20.62 MJ/m2
Daytime Avg0.6138 W/m20.41 MJ/m2
Total1.63 MJ/m2

Air

HourHigh AQILow AQIAvg AQIHigh EPA AQILow EPA AQIAvg EPA AQI
12:00 AM191114171316
01:00 AM1691213811
02:00 AM26111517811
03:00 AM3291321813
04:00 AM1291113810
05:00 AM1891413811
06:00 AM21111613811
07:00 AM17111313810
08:00 AM1591113810
09:00 AM10471389
10:00 AM7451389
SUMMARYHigh AQILow AQIAvg AQIHigh EPA AQILow EPA AQIAvg EPA AQI
Max321116211316
Min7451389
Avg1891214811
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Monthly History

Temperature

DayHigh TempLow TempAvg (NWS)AvgHDDCDDLow Wind ChillAvg Wind Chill
Apr 0139.0°25.0°32.0°32.3°32.70.025.0°31.3°
Apr 0241.5°26.9°34.5°34.4°30.60.022.3°32.2°
Apr 0334.4°32.4°33.0°33.2°31.80.024.5°26.8°
Apr 0439.2°33.7°36.5°36.5°28.50.026.3°31.2°
Apr 0541.6°33.0°37.5°37.5°27.50.029.5°34.3°
Apr 0644.8°30.1°37.5°37.9°27.10.028.4°36.7°
Apr 0751.5°26.3°38.5°39.3°25.70.026.3°39.0°
Apr 0860.2°37.1°48.5°49.7°15.30.037.1°49.4°
Apr 0956.9°43.0°50.0°47.8°17.20.041.7°47.5°
Apr 1060.0°46.7°53.5°52.5°12.50.044.6°51.8°
Apr 1159.1°41.4°50.0°50.9°14.10.038.9°50.6°
Apr 1252.8°42.2°47.5°46.3°18.70.034.9°41.9°
Apr 1349.7°36.4°43.0°42.9°22.10.032.2°40.7°
Apr 1450.8°39.2°45.0°43.1°21.90.036.0°42.5°
SUMMARYHigh TempLow TempAvg (NWS)AvgHDDCDDLow Wind ChillAvg Wind Chill
Max60.2°46.7°53.5°52.5°32.70.044.6°51.8°
Min34.4°25.0°32.0°32.3°12.50.022.3°26.8°
Avg48.7°35.2°41.8°41.7°23.30.032.0°39.6°
Total325.70.0
ThresholdsHigh TempLow Temp 
>= 900 days 
>= 800 days0 days 
<= 320 days4 days 
<= 00 days0 days 

Humidity

DayHigh HumidityLow HumidityAvg HumidityHigh Dew PointLow Dew PointAvg Dew Point
Apr 0196%58%79%28.5°23.5°26.1°
Apr 02100%53%83%34.3°25.5°29.6°
Apr 03100%100%100%34.4°32.4°33.2°
Apr 04100%74%88%35.6°30.5°33.3°
Apr 0592%52%73%33.3°20.5°29.3°
Apr 0684%47%59%30.2°19.9°24.6°
Apr 0784%44%62%35.2°18.9°26.8°
Apr 0890%47%65%43.5°28.5°38.2°
Apr 09100%52%78%47.3°37.4°40.7°
Apr 1069%46%59%41.6°35.8°38.4°
Apr 1186%48%63%41.5°35.2°38.5°
Apr 1296%36%63%43.1°21.1°33.6°
Apr 1368%44%57%35.2°25.8°28.4°
Apr 1487%66%79%40.6°32.9°37.1°
SUMMARYHigh HumidityLow HumidityAvg HumidityHigh Dew PointLow Dew PointAvg Dew Point
Max100%100%100%47.3°37.4°40.7°
Min68%36%57%28.5°18.9°24.6°
Avg89%55%72%37.5°27.7°32.5°

Wind

DayHigh SustainedLow SustainedAvg SustainedHigh GustLow GustAvg GustAvg DirectionWind Run
Apr 016.0 mph0.0 mph2.7 mph13.0 mph0.0 mph6.4 mph10° N65.1 mi
Apr 0212.0 mph1.0 mph4.0 mph26.0 mph2.0 mph10.6 mph358° N96.8 mi
Apr 0311.0 mph4.0 mph7.4 mph31.0 mph13.0 mph20.8 mph23° NNE176.5 mi
Apr 0412.0 mph2.0 mph7.2 mph24.0 mph4.0 mph17.6 mph360° N172.4 mi
Apr 0510.0 mph1.0 mph5.1 mph18.0 mph3.0 mph10.7 mph322° NW123.1 mi
Apr 066.0 mph0.0 mph3.0 mph11.0 mph0.0 mph6.9 mph341° NNW71.6 mi
Apr 077.0 mph0.0 mph2.2 mph14.0 mph0.0 mph5.6 mph87° E53.2 mi
Apr 0810.0 mph0.0 mph4.1 mph25.0 mph0.0 mph10.4 mph159° SSE99.5 mi
Apr 098.0 mph0.0 mph2.8 mph19.0 mph0.0 mph7.1 mph203° SSW66.7 mi
Apr 1010.0 mph0.0 mph3.8 mph18.0 mph0.0 mph9.2 mph189° S92.4 mi
Apr 119.0 mph0.0 mph4.1 mph21.0 mph1.0 mph9.7 mph231° SW97.8 mi
Apr 1218.0 mph1.0 mph11.3 mph37.0 mph3.0 mph24.8 mph320° NW270.3 mi
Apr 1311.0 mph0.0 mph4.4 mph24.0 mph0.0 mph9.8 mph351° N106.5 mi
Apr 147.0 mph0.0 mph2.8 mph15.0 mph0.0 mph7.1 mph53° NE28.6 mi
SUMMARYHigh SustainedLow SustainedAvg SustainedHigh GustLow GustAvg GustAvg DirectionWind Run
Max18.0 mph4.0 mph11.3 mph37.0 mph13.0 mph24.8 mph270.3 mi
Min6.0 mph0.0 mph2.2 mph11.0 mph0.0 mph5.6 mph28.6 mi
Avg9.8 mph0.6 mph4.7 mph21.1 mph1.9 mph11.4 mph344° NNW108.6 mi
Total1520.4 mi

Rain

DayLiquidSnow
Apr 010.00"0.0"
Apr 020.16"0.0"
Apr 030.90"0.0"
Apr 040.04"0.0"
Apr 050.00"0.0"
Apr 060.00"0.0"
Apr 070.00"0.0"
Apr 080.00"0.0"
Apr 090.12"0.0"
Apr 100.00"0.0"
Apr 110.00"0.0"
Apr 120.01"0.0"
Apr 130.00"0.0"
Apr 140.00"0.0"
SUMMARYLiquidSnow
Max0.90"0.0"
Min0.00"0.0"
Avg0.09"0.0"
Total1.23"0.0"
ThresholdsLiquidSnow
>= 0.01"5 days
>= 0.10"3 days0 days
>= 1"0 days0 days
>= 4"0 days0 days
>= 8"0 days

Pressure

DayHigh PressureLow PressureAvg Pressure
Apr 0130.10"29.99"30.05"
Apr 0230.00"29.59"29.80"
Apr 0329.59"29.42"29.49"
Apr 0430.01"29.58"29.78"
Apr 0530.24"30.01"30.14"
Apr 0630.33"30.20"30.27"
Apr 0730.20"29.98"30.10"
Apr 0829.99"29.74"29.84"
Apr 0929.83"29.74"29.79"
Apr 1029.84"29.76"29.80"
Apr 1129.78"29.61"29.67"
Apr 1229.89"29.56"29.71"
Apr 1329.98"29.73"29.89"
Apr 1429.73"29.57"29.63"
SUMMARYHigh PressureLow PressureAvg Pressure
Max30.33"30.20"30.27"
Min29.59"29.42"29.49"
Avg29.97"29.75"29.86"

Solar

DayHigh UVDaytime Avg UVHigh RadiationDaytime Avg RadiationTotal Radiation
Apr 014.31.6817 W/m2321 W/m214.93 MJ/m2
Apr 022.60.8821 W/m2151 W/m27.03 MJ/m2
Apr 031.00.2139 W/m250 W/m22.33 MJ/m2
Apr 044.61.1809 W/m2179 W/m28.43 MJ/m2
Apr 054.62.1796 W/m2430 W/m220.33 MJ/m2
Apr 065.02.3798 W/m2433 W/m220.55 MJ/m2
Apr 075.32.2803 W/m2384 W/m218.27 MJ/m2
Apr 085.11.2889 W/m2225 W/m210.77 MJ/m2
Apr 095.51.11086 W/m2207 W/m29.96 MJ/m2
Apr 105.21.9986 W/m2378 W/m218.24 MJ/m2
Apr 112.50.9369 W/m2156 W/m27.57 MJ/m2
Apr 124.92.0891 W/m2400 W/m219.44 MJ/m2
Apr 135.21.7875 W/m2312 W/m215.23 MJ/m2
Apr 142.10.6496 W/m2138 W/m21.63 MJ/m2
SUMMARYHigh UVDaytime Avg UVHigh RadiationDaytime Avg RadiationTotal Radiation
Max5.52.31086 W/m2433 W/m220.55 MJ/m2
Min1.00.2139 W/m250 W/m21.63 MJ/m2
Avg4.11.4755 W/m2277 W/m212.48 MJ/m2
Total174.72 MJ/m2

Air

DayHigh AQILow AQIAvg AQIHigh EPA AQILow EPA AQIAvg EPA AQI
Apr 014001125410
Apr 0251152905
Apr 03110013-40
Apr 0413011301
Apr 0510031705
Apr 06650353011
Apr 07690453410
Apr 08940868411
Apr 0925062108
Apr 106521950819
Apr 11771728571722
Apr 12420925010
Apr 13160217411
Apr 143241221811
SUMMARYHigh AQILow AQIAvg AQIHigh EPA AQILow EPA AQIAvg EPA AQI
Max941728681722
Min100013-40
Avg442833310
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Yearly History

Temperature

MonthHigh TempLow TempAvg (NWS)AvgHDDCDDHigh Heat IndexAvg Heat IndexLow Wind ChillAvg Wind Chill
Jan50.1°-4.8°23.2°23.6°1284.00.050.1°23.6°-23.3°19.3°
Feb51.0°6.3°29.6°29.2°1038.10.051.0°29.2°-9.0°25.3°
Mar64.3°14.6°33.2°32.8°998.90.064.3°32.8°0.8°29.2°
Apr60.2°25.0°41.8°41.7°326.00.060.2°41.7°22.3°39.6°
SUMMARYHigh TempLow TempAvg (NWS)AvgHDDCDDHigh Heat IndexAvg Heat IndexLow Wind ChillAvg Wind Chill
Max64.3°25.0°41.8°41.7°1284.00.064.3°41.7°22.3°39.6°
Min50.1°-4.8°23.2°23.6°326.00.050.1°23.6°-23.3°19.3°
Avg56.4°10.3°30.4°30.2°911.80.056.4°30.2°-2.3°26.5°
Total3647.10.0
ThresholdsHigh TempLow Temp 
>= 900 days 
>= 800 days0 days 
<= 3238 days83 days 
<= 00 days2 days 

Humidity

MonthHigh HumidityLow HumidityAvg HumidityHigh Dew PointLow Dew PointAvg Dew Point
Jan100%46%81%37.2°-13.9°18.4°
Feb100%26%73%42.2°-0.8°21.2°
Mar100%20%70%47.5°3.4°23.3°
Apr100%36%72%47.3°18.9°32.5°
SUMMARYHigh HumidityLow HumidityAvg HumidityHigh Dew PointLow Dew PointAvg Dew Point
Max100%46%81%47.5°18.9°32.5°
Min100%20%70%37.2°-13.9°18.4°
Avg100%32%74%43.6°1.9°22.4°

Wind

MonthHigh SustainedAvg SustainedHigh GustAvg GustAvg DirectionWind Run
Jan17.0 mph4.1 mph39.0 mph10.2 mph273° W3084.1 mi
Feb18.0 mph4.8 mph37.0 mph11.4 mph265° W3321.4 mi
Mar16.0 mph5.0 mph36.0 mph11.8 mph288° WNW3712.6 mi
Apr18.0 mph4.7 mph37.0 mph11.4 mph344° NNW1518.3 mi
SUMMARYHigh SustainedAvg SustainedHigh GustAvg GustAvg DirectionWind Run
Max18.0 mph5.0 mph39.0 mph11.8 mph3712.6 mi
Min16.0 mph4.1 mph36.0 mph10.2 mph1518.3 mi
Avg17.3 mph4.6 mph37.2 mph11.2 mph279° W3132.1 mi
Total11636.4 mi

Rain

MonthLiquidSnow
Jan1.69"0.6"
Feb0.70"0.0"
Mar2.29"0.0"
Apr1.23"0.0"
SUMMARYLiquidSnow
Max2.29"0.6"
Min0.70"0.0"
Avg1.48"0.2"
Total5.91"0.6"
ThresholdsLiquidSnow
>= 0.01"38 days
>= 0.10"15 days1 day
>= 1"0 days0 days
>= 4"0 days0 days
>= 8"0 days

Pressure

MonthHigh PressureLow PressureAvg Pressure
Jan30.45"29.21"29.97"
Feb30.37"29.20"29.90"
Mar30.33"29.22"29.94"
Apr30.33"29.42"29.86"
SUMMARYHigh PressureLow PressureAvg Pressure
Max30.45"29.42"29.97"
Min30.33"29.20"29.86"
Avg30.37"29.26"29.93"

Solar

MonthHigh UVDaytime Avg UVHigh RadiationDaytime Avg RadiationTotal Radiation
Jan1.70.2584 W/m285 W/m286.57 MJ/m2
Feb2.70.6856 W/m2163 W/m2177.25 MJ/m2
Mar4.41.01000 W/m2222 W/m2297.49 MJ/m2
Apr5.51.41086 W/m2276 W/m2174.18 MJ/m2
SUMMARYHigh UVDaytime Avg UVHigh RadiationDaytime Avg RadiationTotal Radiation
Max5.51.41086 W/m2276 W/m2297.49 MJ/m2
Min1.70.2584 W/m285 W/m286.57 MJ/m2
Avg3.60.7882 W/m2172 W/m2183.87 MJ/m2
Total735.49 MJ/m2

Air

MonthHigh AQILow AQIAvg AQIHigh EPA AQILow EPA AQIAvg EPA AQI
Jan232022197019
Feb132025107022
Mar251015211016
Apr940868-410
SUMMARYHigh AQILow AQIAvg AQIHigh EPA AQILow EPA AQIAvg EPA AQI
Max251025211022
Min940868-410
Avg177019146-118
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Marquette, MI Normals

Month TempHi TempLo TempAv Depart Rain Snow
January 24.6° F 12.4° F 18.5° F -0.6° F 1.86" 25.1"
February 26.9° F 12.5° F 19.7° F -0.2° F 1.47" 20.9"
March 35.3° F 21.0° F 28.2° F 0.0° F 1.59" 14.2"
April 45.8° F 31.0° F 38.4° F 1.0° F 2.74" 8.4"
May 58.7° F 40.8° F 49.8° F 2.9° F 2.90" 0.3"
June 67.9° F 50.1° F 59.0° F 2.8° F 3.05" 0.0"
July 74.6° F 57.7° F 66.2° F 1.6° F 3.11" 0.0"
August 74.3° F 58.1° F 66.2° F 0.4° F 2.31" 0.0"
September 67.3° F 51.6° F 59.4° F 0.5° F 3.34" 0.0"
October 53.9° F 40.0° F 47.0° F -0.1° F 3.43" 0.9"
November 40.6° F 28.5° F 34.5° F -0.4° F 2.42" 11.1"
December 30.2° F 18.6° F 24.4° F -0.5° F 1.98" 21.1"
SUMMARY TempHi TempLo TempAv Depart Rain Snow
Avg 50.0° F 35.2° F 42.6° F 0.63
Total 30.2" 102.0"
Based on official Marquette NOAA COOP station averages 1991-2020
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Station Records


marquetteweather.com

Highest recorded temperature: 95.7 °F on Sep 4, 2023
Lowest recorded temperature: -14.7 °F on Jan 31, 2019
Total recorded temperature range: 110.4 °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: May 27, 2023 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.
  • 24 hour graphs at the top of the page are updated every 5 minutes.
  • Daily and monthly history tables are updated along with the graphs 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 NWS averages 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 50 or below and sustained wind speed is greater than 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 24 hour graphs contain corrected humidities & dew points.

Precipitation

  • "Liquid" precipitation in the winter is the amount of melted snow and/or ice.
  • Daily snowfall record keeping ran from October 2017 through December 2023. Snowfall is no longer measured.
  • 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).

Air Quality

  • Air quality data collection began June 21, 2023. The table contains the Air Quality Index (AQI) and the EPA-adjusted AQI (which is the reading published on the City/home page). AQI is based on a 2.5 micron particle count. The scale is 0-500. The higher the AQI, the worse the air quality. We use a Purple Air dual-laser particle counter which records the 2-minute average AQI every minute. For an explanation of the ratings (not published here) that accompany AQI please tap on the linked headline "Air Quality" on the City page (in the Weather Conditions section at the top/left).
  • Sometimes my neighbor to the south burns trash (notable on days with a south wind). Also two doors down to the east is an Airbnb home with a fire pit. Burning events will be evidenced by a 1 hour spike in AQI. On such days, it is important to evaluate the daily average rather than maximum AQI.
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