Alton, Illinois, United States Climate

Weather: 19.73°C/67.51°F, Wind SW at 1.34 km/h, 56% Humidity, 0% Chance of rain

United States
(Photo by Andres Garcia on Unsplash)
Contents

Alton Climate Summary

Located at an elevation of None meters (0 feet) above sea level, Alton has a Humid subtropical, no dry season climate (Classification: Cfa). The district’s yearly temperature is 13.7ºC (56.66ºF) and it is 1.06% higher than United States’s averages. Alton typically receives about 32.28 millimeters (1.27 inches) of precipitation and has 40.91 rainy days (11.21% of the time) annually.

CountryUnited States
CityIllinois
Longitude-90.1842764
Latitude38.8906038
Attitude/ElevationNonem (0ft)
Local timeThursday 15:08
Annual high temperature16.88ºC (62.38ºF)
Annual low temperature8.85ºC (47.93ºF)
Average annual precip.32.28mm (1.27in)
Warmest monthJuly (29.09ºC / 84.36ºF)
Coldest MonthJanuary (-3.92ºC / 24.94ºF)
Wettest MonthAugust (49.75mm / 1.96in)
Driest MonthDecember (15.0mm / 0.59in)
Number of days with rainfall (≥ 1.0 mm)40.91 days (11.21%)
Days with no rain324.09000000000003 days (88.79%)
Humidity74.83%

Climate Alton: Weather By Month

MonthJanFebMarAprMayJunJulAugSepNovOctDecYear
Record high °C (°F)18.0(64.4)24.0(75.2)24.0(75.2)28.0(82.4)34.0(93.2)34.0(93.2)34.0(93.2)35.0(95.0)32.0(89.6)32.0(89.6)23.0(73.4)18.0(64.4)35.0(95.0)
Average high °C (°F)2.69(36.84)5.14(41.25)10.45(50.81)15.72(60.3)23.76(74.77)28.09(82.56)29.09(84.36)27.92(82.26)26.44(79.59)17.46(63.43)9.46(49.03)6.32(43.38)16.88(62.38)
Daily mean °C (°F)0.03(32.05)2.07(35.73)7.26(45.07)11.92(53.46)20.66(69.19)24.92(76.86)26.08(78.94)24.66(76.39)22.64(72.75)14.09(57.36)6.44(43.59)3.62(38.52)13.7(56.66)
Average low °C (°F)-3.92(24.94)-2.31(27.84)2.63(36.73)6.32(43.38)15.17(59.31)19.18(66.52)20.83(69.49)19.52(67.14)17.34(63.21)9.18(48.52)2.28(36.1)-0.02(31.96)8.85(47.93)
Record low °C (°F)-22.0(-7.6)-15.0(5.0)-15.0(5.0)-7.0(19.4)2.0(35.6)11.0(51.8)15.0(59.0)13.0(55.4)7.0(44.6)-2.0(28.4)-13.0(8.6)-11.0(12.2)-22.0(-7.6)
Average precipitation mm (inches)26.97(1.06)24.22(0.95)29.48(1.16)29.73(1.17)41.97(1.65)49.16(1.94)46.34(1.82)49.75(1.96)32.42(1.28)25.58(1.01)16.7(0.66)15.0(0.59)32.28(1.27)
Average precipitation days (≥ 1.0 mm)2.092.822.913.454.735.04.274.644.03.02.271.733.41
Average relative humidity (%)74.5872.7171.8471.0476.2776.1281.1681.3876.3869.2272.774.5374.83
Mean monthly sunshine hours6.768.128.99.5712.5113.4513.4510.810.739.396.956.729.78

Climate Graph

The chart below shows the mean monthly temperature and precipitation of Alton in recent years.

Alton

Alton Temperature by Month

July
26.08°C | 78.94°F
June
24.92°C | 76.86°F
August
24.66°C | 76.39°F
September
22.64°C | 72.75°F
May
20.66°C | 69.19°F
October
14.09°C | 57.36°F
April
11.92°C | 53.46°F
March
7.26°C | 45.07°F
November
6.44°C | 43.59°F
December
3.62°C | 38.52°F
February
2.07°C | 35.73°F
January
0.03°C | 32.05°F

Historical Data

Summary
  • 2020
  • 2019
  • 2018
  • January
  • February
  • March
  • April
  • May
  • June
  • July
  • August
  • September
  • October
  • November
  • December
TemperatureMaxAverageMin
Max Temperature31.0°C (87.8°F)24.8°C (76.64°F)17.0°C (62.6°F)
Avg Temperature27.0°C (80.6°F)20.77°C (69.39°F)13.0°C (55.4°F)
Min Temperature21.0°C (69.8°F)15.37°C (59.67°F)7.0°C (44.6°F)
Dew PointMaxAverageMin
Dew Point22.0°C (71.6°F)14.07°C (57.33°F)6.0°C (42.8°F)
PrecipitationMaxAverageMinSum
Precipitation22.4mm | 0.88in1.56mm | 0.06in0.0mm | 0in46.9mm | 1.85in
Snowdepth0.0mm | 0in0.0mm | 0in0.0mm | 0in0.0mm | 0in
WindMaxAverageMin
Wind17.0kmh | 10.56mph12.13kmh | 7.54mph6.0kmh | 3.73mph
Gust Wind28.0kmh | 17.4mph19.77kmh | 12.28mph11.0kmh | 6.84mph
Sea Level PressureMaxAverageMin
Sea Level Pressure22.4mb1.56mb0.0mb
Alton

Daily Observations

TimeTemperatureDew PointHumidityWind SpeedPressurePrecipitation
September° C | ° F° C | ° F%Kph | MphHg | MbTotal (mm/in)
2020-09-0125 | 77.022 | 71.68711 | 6.8429.83 | 101016.2 | 0.64
2020-09-0225 | 77.022 | 71.6869 | 5.5929.83 | 10101.4 | 0.06
2020-09-0326 | 78.819 | 66.27512 | 7.4629.85 | 10110.0 | 0.0
2020-09-0421 | 69.811 | 51.8607 | 4.3530.15 | 10210.0 | 0.0
2020-09-0523 | 73.413 | 55.46111 | 6.8430.21 | 10230.4 | 0.02
2020-09-0626 | 78.819 | 66.27116 | 9.9430.0 | 10160.0 | 0.0
2020-09-0724 | 75.218 | 64.47216 | 9.9429.85 | 10112.5 | 0.1
2020-09-0827 | 80.619 | 66.26915 | 9.3229.88 | 10120.1 | 0.0
2020-09-0925 | 77.019 | 66.2799 | 5.5930.09 | 10191.0 | 0.04
2020-09-1021 | 69.818 | 64.48615 | 9.3230.27 | 10250.1 | 0.0
2020-09-1120 | 68.017 | 62.68712 | 7.4630.18 | 10220.9 | 0.04
2020-09-1223 | 73.418 | 64.48310 | 6.2129.94 | 10141.7 | 0.07
2020-09-1320 | 68.016 | 60.88313 | 8.0830.0 | 10160.0 | 0.0
2020-09-1421 | 69.815 | 59.07913 | 8.0830.24 | 10240.0 | 0.0
2020-09-1519 | 66.212 | 53.67210 | 6.2130.18 | 10220.0 | 0.0
2020-09-1622 | 71.615 | 59.0716 | 3.7330.03 | 10170.0 | 0.0
2020-09-1721 | 69.815 | 59.07614 | 8.730.06 | 10180.0 | 0.0
2020-09-1816 | 60.87 | 44.66216 | 9.9430.24 | 10240.0 | 0.0
2020-09-1914 | 57.26 | 42.86311 | 6.8430.3 | 10260.0 | 0.0
2020-09-2016 | 60.88 | 46.46512 | 7.4630.3 | 10260.0 | 0.0
2020-09-2118 | 64.410 | 50.06811 | 6.8430.27 | 10250.0 | 0.0
2020-09-2219 | 66.211 | 51.86810 | 6.2130.18 | 10220.0 | 0.0
2020-09-2319 | 66.213 | 55.4728 | 4.9730.06 | 10180.0 | 0.0
2020-09-2419 | 66.213 | 55.47312 | 7.4629.94 | 10140.0 | 0.0
2020-09-2520 | 68.013 | 55.4759 | 5.5929.94 | 10140.0 | 0.0
2020-09-2623 | 73.416 | 60.87317 | 10.5629.85 | 10110.0 | 0.0
2020-09-2723 | 73.415 | 59.07016 | 9.9429.77 | 10080.2 | 0.01
2020-09-2815 | 59.010 | 50.07916 | 9.9429.91 | 101322.4 | 0.88
2020-09-2913 | 55.46 | 42.87011 | 6.8430.0 | 10160.0 | 0.0
2020-09-3019 | 66.26 | 42.85216 | 9.9429.85 | 10110.0 | 0.0

Alton 3 Year Historical Weather Data

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