Historical Weather Data

Observations began July 2015

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Last 24 hours:

Temperature graph Heat index graph Humidity graph Dew point graph Wind direction graph Wind speed graph Barometric Pressure graph Rainfall graph
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Daily History

Temperature

HourHigh TempLow TempAvgLow Wind ChillAvg Wind Chill
12:00 AM39.8°39.1°39.3°39.1°39.3°
01:00 AM39.2°38.9°39.1°38.9°39.1°
02:00 AM39.4°38.9°39.1°38.9°39.1°
03:00 AM39.7°39.3°39.6°39.3°39.6°
04:00 AM39.4°38.6°39.2°36.3°38.7°
05:00 AM38.8°38.4°38.6°38.4°38.6°
06:00 AM38.9°38.4°38.6°38.4°38.6°
07:00 AM38.8°37.9°38.3°37.9°38.3°
08:00 AM38.4°37.9°38.2°37.9°38.2°
09:00 AM38.9°38.1°38.4°32.9°37.2°
10:00 AM38.6°37.6°38.1°34.6°37.6°
11:00 AM38.3°37.0°37.7°33.9°37.0°
12:00 PM38.9°37.3°38.2°32.8°35.3°
01:00 PM38.0°36.4°36.8°31.0°32.1°
02:00 PM37.3°36.3°36.9°32.2°34.3°
03:00 PM37.2°36.6°36.9°32.5°34.3°
04:00 PM37.1°36.3°36.8°31.3°32.4°
05:00 PM36.7°36.0°36.2°30.3°31.4°
06:00 PM36.2°35.8°36.0°30.4°31.5°
07:00 PM36.2°35.9°36.1°31.8°33.1°
08:00 PM36.1°35.9°36.0°32.6°33.3°
SUMMARYHigh TempLow TempAvgLow Wind ChillAvg Wind Chill
Max39.8°39.3°39.6°39.3°39.6°
Min36.1°35.8°36.0°30.3°31.4°
Avg38.2°37.5°37.9°34.8°36.2°

Humidity & Dew Point

HourHigh HumidityLow HumidityAvg HumidityHigh Dew PointLow Dew PointAvg Dew Point
12:00 AM86%83%85%35.5°34.8°35.2°
01:00 AM90%86%89%36.4°35.3°36.0°
02:00 AM93%92%92%37.5°36.8°37.1°
03:00 AM93%92%93%37.8°37.4°37.7°
04:00 AM94%93%93%37.6°37.0°37.4°
05:00 AM94%94%94%37.2°36.8°37.0°
06:00 AM94%94%94%37.3°36.8°37.0°
07:00 AM94%94%94%37.2°36.3°36.7°
08:00 AM95%94%94%37.1°36.3°36.6°
09:00 AM95%94%94%37.5°36.5°36.9°
10:00 AM95%94%94%37.3°36.0°36.6°
11:00 AM95%94%95%37.0°35.4°36.3°
12:00 PM95%94%95%37.6°36.0°36.8°
01:00 PM95%94%95%36.5°35.0°35.4°
02:00 PM95%95%95%36.0°35.0°35.6°
03:00 PM95%95%95%35.9°35.3°35.6°
04:00 PM95%95%95%35.8°35.0°35.5°
05:00 PM95%95%95%35.4°34.7°34.9°
06:00 PM95%95%95%34.9°34.5°34.7°
07:00 PM95%95%95%34.9°34.6°34.8°
08:00 PM95%95%95%34.8°34.6°34.7°
SUMMARYHigh HumidityLow HumidityAvg HumidityHigh Dew PointLow Dew PointAvg Dew Point
Max95%95%95%37.8°37.4°37.7°
Min86%83%85%34.8°34.5°34.7°
Avg94%93%94%36.5°35.7°36.2°

Wind

HourHigh 10 Min AvgLow 10 Min AvgAvg 10 Min AvgHigh MaxLow MaxAvg MaxAvg DirectionWind Run
12:00 AM3.0 mph1.0 mph2.0 mph8.0 mph0.0 mph5.3 mph357° N2.0 mi
01:00 AM3.0 mph1.0 mph2.0 mph6.0 mph0.0 mph4.0 mph351° N2.0 mi
02:00 AM3.0 mph0.0 mph1.6 mph6.0 mph0.0 mph3.6 mph335° NNW1.6 mi
03:00 AM3.0 mph1.0 mph2.0 mph9.0 mph3.0 mph6.6 mph354° N2.0 mi
04:00 AM4.0 mph1.0 mph2.7 mph10.0 mph5.0 mph8.3 mph27° NNE2.7 mi
05:00 AM3.0 mph1.0 mph2.3 mph8.0 mph5.0 mph6.0 mph4° N2.3 mi
06:00 AM3.0 mph1.0 mph2.4 mph8.0 mph4.0 mph6.5 mph8° N2.4 mi
07:00 AM3.0 mph2.0 mph2.4 mph10.0 mph6.0 mph8.4 mph59° ENE2.4 mi
08:00 AM2.0 mph1.0 mph1.1 mph4.0 mph2.0 mph3.5 mph78° ENE1.1 mi
09:00 AM7.0 mph1.0 mph3.0 mph12.0 mph4.0 mph6.7 mph44° NE3.0 mi
10:00 AM4.0 mph1.0 mph2.5 mph12.0 mph3.0 mph7.5 mph1° N2.5 mi
11:00 AM4.0 mph2.0 mph3.2 mph9.0 mph5.0 mph7.5 mph346° NNW3.2 mi
12:00 PM7.0 mph3.0 mph4.7 mph15.0 mph8.0 mph10.5 mph334° NNW4.6 mi
01:00 PM8.0 mph4.0 mph6.0 mph16.0 mph10.0 mph13.7 mph342° NNW6.0 mi
02:00 PM5.0 mph3.0 mph3.9 mph11.0 mph9.0 mph9.7 mph354° N3.9 mi
03:00 PM5.0 mph3.0 mph3.9 mph11.0 mph9.0 mph9.5 mph346° NNW3.9 mi
04:00 PM6.0 mph4.0 mph5.4 mph14.0 mph10.0 mph12.6 mph347° NNW5.4 mi
05:00 PM7.0 mph5.0 mph5.9 mph15.0 mph11.0 mph13.0 mph354° N5.9 mi
06:00 PM7.0 mph4.0 mph5.4 mph15.0 mph11.0 mph12.3 mph345° NNW5.4 mi
07:00 PM5.0 mph3.0 mph4.0 mph11.0 mph8.0 mph10.3 mph355° N4.0 mi
08:00 PM4.0 mph3.0 mph3.8 mph10.0 mph8.0 mph8.6 mph341° NNW1.5 mi
SUMMARYHigh 10 Min AvgLow 10 Min AvgAvg 10 Min AvgHigh MaxLow MaxAvg MaxAvg DirectionWind Run
Max8.0 mph5.0 mph6.0 mph16.0 mph11.0 mph13.7 mph6.0 mi
Min2.0 mph0.0 mph1.1 mph4.0 mph0.0 mph3.5 mph1.1 mi
Avg4.6 mph2.1 mph3.3 mph10.5 mph5.8 mph8.3 mph1° N3.2 mi
Total67.8 mi

Precipitation

DateLiquidSnow
2019-04-221.25"0.0"

Pressure

HourHigh PressureLow PressureAvg Pressure
12:00 AM30.15"30.13"30.14"
01:00 AM30.15"30.13"30.14"
02:00 AM30.14"30.11"30.12"
03:00 AM30.14"30.09"30.11"
04:00 AM30.11"30.09"30.10"
05:00 AM30.12"30.10"30.11"
06:00 AM30.13"30.10"30.12"
07:00 AM30.13"30.10"30.12"
08:00 AM30.14"30.12"30.13"
09:00 AM30.14"30.10"30.13"
10:00 AM30.14"30.11"30.12"
11:00 AM30.15"30.11"30.12"
12:00 PM30.15"30.09"30.12"
01:00 PM30.11"30.09"30.10"
02:00 PM30.10"30.10"30.10"
03:00 PM30.11"30.09"30.10"
04:00 PM30.10"30.09"30.10"
05:00 PM30.09"30.08"30.09"
06:00 PM30.09"30.06"30.07"
07:00 PM30.07"30.06"30.07"
08:00 PM30.07"30.06"30.07"
SUMMARYHigh PressureLow PressureAvg Pressure
Max30.15"30.13"30.14"
Min30.07"30.06"30.07"
Avg30.12"30.10"30.11"
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Monthly History

Temperature

DayHigh TempLow TempAvg (NWS)AvgHDDCDDLow Wind ChillAvg Wind Chill
Apr 0140.6°25.6°33.5°31.6°33.40.017.4°26.8°
Apr 0249.2°32.2°40.5°38.9°26.10.026.7°35.9°
Apr 0337.9°25.6°32.0°31.5°33.50.015.1°25.2°
Apr 0436.7°22.5°29.5°30.1°34.90.018.1°27.9°
Apr 0543.7°30.2°37.0°36.7°28.30.024.7°34.3°
Apr 0644.5°38.1°41.0°41.1°23.90.038.1°41.1°
Apr 0753.9°36.6°45.5°43.3°21.70.036.6°43.3°
Apr 0852.4°38.0°45.0°42.3°22.70.034.9°42.1°
Apr 0941.5°31.1°36.5°35.9°29.10.022.2°31.1°
Apr 1033.5°29.3°31.0°31.5°33.50.023.0°27.8°
Apr 1133.3°27.1°30.0°30.5°34.50.016.9°23.7°
Apr 1240.2°28.2°34.0°34.1°30.90.018.5°30.1°
Apr 1338.6°32.5°36.0°35.2°29.80.025.4°30.3°
Apr 1437.2°25.1°31.0°32.7°32.30.021.1°30.3°
Apr 1543.4°30.2°36.5°37.2°27.80.025.0°34.7°
Apr 1656.1°35.9°46.0°44.9°20.10.035.1°44.3°
Apr 1759.0°35.3°47.0°46.4°18.60.031.2°44.6°
Apr 1839.7°34.7°37.5°36.7°28.30.028.8°31.8°
Apr 1951.8°34.3°43.0°41.7°23.30.030.5°39.8°
Apr 2069.2°31.0°50.0°50.2°14.80.031.0°50.2°
Apr 2154.7°38.4°46.5°44.8°20.20.033.8°43.4°
Apr 2239.8°35.8°38.0°37.9°27.10.030.3°36.2°
SUMMARYHigh TempLow TempAvg (NWS)AvgHDDCDDLow Wind ChillAvg Wind Chill
Max69.2°38.4°50.0°50.2°34.90.038.1°50.2°
Min33.3°22.5°29.5°30.1°14.80.015.1°23.7°
Avg45.3°31.7°38.5°38.0°27.00.026.6°35.2°
Total594.70.0
ThresholdsHigh TempLow Temp 
>= 800 days 
<= 320 days11 days 
<= 00 days0 days 

Humidity & Dew Point

DayHigh HumidityLow HumidityAvg HumidityHigh Dew PointLow Dew PointAvg Dew Point
Apr 0170%34%51%24.7°6.7°14.9°
Apr 0283%32%57%32.8°17.5°24.0°
Apr 0386%27%50%25.5°6.0°14.1°
Apr 0465%40%55%23.2°11.4°15.5°
Apr 0584%45%72%34.2°14.0°28.4°
Apr 0693%69%79%38.9°32.6°35.1°
Apr 0795%68%88%45.2°35.1°39.8°
Apr 0895%56%85%43.7°33.2°38.0°
Apr 0993%67%84%37.3°25.3°31.3°
Apr 1082%53%66%27.7°15.9°21.2°
Apr 1192%55%71%25.9°18.1°22.0°
Apr 1295%64%83%35.7°25.1°29.2°
Apr 1385%47%63%29.9°19.0°23.7°
Apr 1483%56%70%29.5°20.4°23.7°
Apr 1562%34%49%24.2°15.1°19.5°
Apr 1679%35%58%38.2°17.7°30.7°
Apr 1792%33%66%37.7°28.7°34.8°
Apr 1895%75%90%35.7°32.2°34.1°
Apr 1981%29%60%34.1°15.9°28.1°
Apr 2069%16%36%31.0°10.2°21.8°
Apr 2186%26%58%35.5°19.0°29.4°
Apr 2295%86%94%37.8°34.5°36.2°
SUMMARYHigh HumidityLow HumidityAvg HumidityHigh Dew PointLow Dew PointAvg Dew Point
Max95%86%94%45.2°35.1°39.8°
Min62%16%36%23.2°6.0°14.1°
Avg85%48%67%33.1°20.6°27.0°

Wind

DayHigh 10 Min AvgLow 10 Min AvgAvg 10 Min AvgHigh MaxLow MaxAvg MaxAvg DirectionWind Run
Apr 0111.0 mph1.0 mph5.6 mph25.0 mph0.0 mph13.1 mph227° SW135.5 mi
Apr 0213.0 mph3.0 mph6.0 mph26.0 mph6.0 mph14.5 mph242° WSW144.7 mi
Apr 0314.0 mph1.0 mph7.7 mph28.0 mph2.0 mph17.4 mph310° NW185.7 mi
Apr 048.0 mph0.0 mph3.6 mph17.0 mph0.0 mph8.1 mph59° ENE86.8 mi
Apr 057.0 mph0.0 mph3.5 mph17.0 mph0.0 mph9.0 mph183° S83.5 mi
Apr 063.0 mph0.0 mph1.1 mph7.0 mph0.0 mph2.9 mph203° SSW26.4 mi
Apr 079.0 mph0.0 mph2.1 mph20.0 mph0.0 mph5.5 mph173° S52.1 mi
Apr 086.0 mph0.0 mph2.3 mph14.0 mph0.0 mph5.8 mph302° WNW54.6 mi
Apr 0912.0 mph0.0 mph6.2 mph24.0 mph0.0 mph14.2 mph322° NW149.9 mi
Apr 107.0 mph2.0 mph4.3 mph16.0 mph4.0 mph11.7 mph27° NNE103.4 mi
Apr 1112.0 mph2.0 mph7.6 mph27.0 mph5.0 mph17.3 mph90° E183.3 mi
Apr 1212.0 mph0.0 mph5.4 mph27.0 mph0.0 mph12.9 mph149° SSE128.3 mi
Apr 1312.0 mph0.0 mph6.4 mph24.0 mph0.0 mph15.0 mph273° W153.0 mi
Apr 148.0 mph0.0 mph3.5 mph15.0 mph0.0 mph7.8 mph340° NNW83.9 mi
Apr 159.0 mph0.0 mph3.9 mph17.0 mph0.0 mph8.6 mph11° N92.6 mi
Apr 169.0 mph0.0 mph3.2 mph20.0 mph0.0 mph8.0 mph170° S76.5 mi
Apr 1710.0 mph1.0 mph5.1 mph21.0 mph3.0 mph12.3 mph163° SSE121.7 mi
Apr 1810.0 mph2.0 mph6.6 mph24.0 mph9.0 mph15.9 mph350° N157.6 mi
Apr 198.0 mph0.0 mph3.8 mph16.0 mph0.0 mph8.4 mph350° N90.2 mi
Apr 209.0 mph0.0 mph4.0 mph22.0 mph0.0 mph9.3 mph208° SSW95.7 mi
Apr 2110.0 mph1.0 mph4.9 mph22.0 mph1.0 mph11.1 mph326° NW116.6 mi
Apr 228.0 mph0.0 mph3.3 mph16.0 mph0.0 mph8.3 mph1° N67.8 mi
SUMMARYHigh 10 Min AvgLow 10 Min AvgAvg 10 Min AvgHigh MaxLow MaxAvg MaxAvg DirectionWind Run
Max14.0 mph3.0 mph7.7 mph28.0 mph9.0 mph17.4 mph185.7 mi
Min3.0 mph0.0 mph1.1 mph7.0 mph0.0 mph2.9 mph26.4 mi
Avg9.4 mph0.6 mph4.6 mph20.2 mph1.4 mph10.8 mph300° WNW108.6 mi
Total2389.8 mi

Precipitation

DayLiquidSnow
Apr 010.00"0.0"
Apr 020.09"0.0"
Apr 030.07"0.9"
Apr 040.00"0.0"
Apr 050.03"0.4"
Apr 060.01"0.0"
Apr 070.13"0.0"
Apr 080.61"0.0"
Apr 090.02"0.0"
Apr 100.00"0.0"
Apr 110.53"3.6"
Apr 120.44"0.6"
Apr 130.03"0.0"
Apr 140.00"0.0"
Apr 150.00"0.0"
Apr 160.02"0.0"
Apr 170.62"0.0"
Apr 180.23"0.0"
Apr 190.00"0.0"
Apr 200.00"0.0"
Apr 210.17"0.0"
Apr 221.25"0.0"
SUMMARYLiquidSnow
Max1.25"3.6"
Min0.00"0.0"
Avg0.19"0.3"
Total4.25"5.5"
ThresholdsLiquidSnow
>= 0.01"15 days
>= 0.10"8 days4 days
>= 1"1 day1 day
>= 4"0 days0 days
>= 8"0 days

Pressure

DayHigh PressureLow PressureAvg Pressure
Apr 0130.22"29.93"30.10"
Apr 0229.93"29.65"29.79"
Apr 0330.30"29.75"30.06"
Apr 0430.51"30.26"30.40"
Apr 0530.26"30.00"30.08"
Apr 0630.17"30.06"30.11"
Apr 0730.11"29.69"29.89"
Apr 0829.78"29.68"29.73"
Apr 0930.06"29.72"29.83"
Apr 1030.25"30.04"30.18"
Apr 1130.24"29.85"30.12"
Apr 1229.86"29.45"29.58"
Apr 1330.12"29.61"29.85"
Apr 1430.11"29.82"29.96"
Apr 1529.97"29.82"29.91"
Apr 1630.04"29.91"29.95"
Apr 1730.04"29.63"29.91"
Apr 1829.89"29.52"29.67"
Apr 1930.01"29.87"29.96"
Apr 2029.95"29.72"29.85"
Apr 2130.17"29.75"29.96"
Apr 2230.15"30.06"30.11"
SUMMARYHigh PressureLow PressureAvg Pressure
Max30.51"30.26"30.40"
Min29.78"29.45"29.58"
Avg30.10"29.81"29.95"
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Yearly History

Temperature

MonthHigh TempLow TempAvg (NWS)AvgHDDCDDHigh Heat IndexAvg Heat IndexLow Wind ChillAvg Wind Chill
Jan39.5°-14.7°14.6°15.2°1544.00.039.5°15.2°-30.8°8.6°
Feb35.5°-7.8°15.8°16.9°1347.40.035.5°16.9°-18.1°13.1°
Mar54.0°-7.5°26.8°26.6°1189.70.054.0°26.6°-21.9°22.5°
Apr69.2°22.5°38.5°38.0°594.60.069.2°38.0°15.1°35.2°
SUMMARYHigh TempLow TempAvg (NWS)AvgHDDCDDHigh Heat IndexAvg Heat IndexLow Wind ChillAvg Wind Chill
Max69.2°22.5°38.5°38.0°1544.00.069.2°38.0°15.1°35.2°
Min35.5°-14.7°14.6°15.2°594.60.035.5°15.2°-30.8°8.6°
Avg49.6°-1.9°22.9°23.2°1168.90.049.6°23.2°-13.9°18.7°
Total4675.70.0
ThresholdsHigh TempLow Temp 
>= 900 days 
>= 800 days0 days 
<= 3261 days96 days 
<= 00 days17 days 

Humidity & Dew Point

MonthHigh HumidityLow HumidityAvg HumidityHigh Dew PointLow Dew PointAvg Dew Point
Jan95%38%71%33.6°-23.6°7.5°
Feb97%32%76%30.3°-20.0°10.5°
Mar95%17%62%44.2°-16.6°14.7°
Apr95%16%67%45.2°6.0°27.0°
SUMMARYHigh HumidityLow HumidityAvg HumidityHigh Dew PointLow Dew PointAvg Dew Point
Max97%38%76%45.2°6.0°27.0°
Min95%16%62%30.3°-23.6°7.5°
Avg96%26%69%38.3°-13.6°14.0°

Wind

MonthHigh 10 Min AvgAvg 10 Min AvgHigh MaxAvg MaxAvg DirectionWind Run
Jan17.0 mph5.4 mph33.0 mph12.5 mph277° W4023.4 mi
Feb24.0 mph3.8 mph51.0 mph8.7 mph290° WNW2527.1 mi
Mar18.0 mph5.2 mph39.0 mph12.3 mph292° WNW3847.6 mi
Apr14.0 mph4.6 mph28.0 mph10.8 mph300° WNW2388.2 mi
SUMMARYHigh 10 Min AvgAvg 10 Min AvgHigh MaxAvg MaxAvg DirectionWind Run
Max24.0 mph5.4 mph51.0 mph12.5 mph4023.4 mi
Min14.0 mph3.8 mph28.0 mph8.7 mph2388.2 mi
Avg18.3 mph4.7 mph37.8 mph11.1 mph286° WNW3255.6 mi
Total12786.2 mi

Precipitation

MonthLiquidSnow
Jan2.17"23.1"
Feb5.44"50.3"
Mar0.88"5.3"
Apr4.21"5.5"
SUMMARYLiquidSnow
Max5.44"50.3"
Min0.88"5.3"
Avg3.18"21.1"
Total12.70"84.2"
ThresholdsLiquidSnow
>= 0.01"58 days
>= 0.10"29 days43 days
>= 1"3 days21 days
>= 4"0 days5 days
>= 8"2 days

Pressure

MonthHigh PressureLow PressureAvg Pressure
Jan30.57"29.39"30.04"
Feb30.79"29.02"30.06"
Mar30.41"29.19"30.04"
Apr30.51"29.45"29.95"
SUMMARYHigh PressureLow PressureAvg Pressure
Max30.79"29.45"30.06"
Min30.41"29.02"29.95"
Avg30.57"29.26"30.03"
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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 0.0° 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 0.9° F 2.45" 7.5"
May 59.4° F 42.6° F 51.0° F 4.0° 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 1.7° F 2.82" 0.0"
August 74.2° F 59.0° F 66.6° F 0.6° 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 -0.4° 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 0.79
Total 29.13" 117.2"
Records from Marquette Waste Water Treatment Plant 1981-2010
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Station Records


marquetteweather.com

Highest recorded temperature: 93.5 °F on Jul 21, 2016
Lowest recorded temperature: -14.7 °F on Jan 31, 2019
Total recorded temperature range: 108.2 °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.

Official Records

Forecast Accuracy

screen shot

View the accuracy of current &
past forecasted temperatures

* * * * *

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Notes:

  • 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 along with daily and monthly history tables are updated every 5 minutes. Yearly histories are updated at the top of every hour.
  • "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.
  • "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 10 Min Avg" & "Low Max" wind values are omitted from the yearly history table since every field equals 0.
  • In the daily & monthly history tables, "Wind Chill" appears only October through April. It is calculated when the temperature is 45 or below and average 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.
  • 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).
  • "Liquid" precipitation in the winter is the amount of melted snow and/or ice.
  • Snow measurement began in October 2017.
  • 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.
  • Humidity and dewpoint are corrected in all tables according to a custom calibration curve. 24 hour graphs contain uncorrected values.
  • Since January 15, 2018, pressure is recorded in altimeter format. The home page, however, continues to display "Barometer" in MSLP format by default.
  • "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 Waste Water Treatment 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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