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Machesney Park, Illinois climate

Dfb Warm-summer humid continental

Machesney Park has a strongly seasonal cool-temperate climate (Warm-summer humid continental, Köppen Dfb). The hottest month is July with an average daily high near 26°C, while the coldest is January averaging around −12°C at night. Around 950 mm of precipitation falls each year, peaking in June (143 mm) and easing off in February (39 mm). Winters bring significant snowfall (90 cm of snow per year on average).

☀️ Summers
Warm
Highs near 26°C in July.
About 10 days a year above 32 °C
❄️ Winters
Very cold
Lows near −12°C in January.
About 141 freezing nights a year
🌧️ Rain & snow
Moderate rainfall
About 950 mm of rain a year, plus 90 cm of snow.
Snow falls through the winter months
⛅ Sky & trend
Partly cloudy
A roughly even mix of sun and cloud.
−1.5 °C vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation split into rain and snow · 1991–2020 normals · hover a month for the exact figures TEMPERATURE °C -20°-10°0°10°20°30° PRECIPITATION (mm) 075150 RainSnow JanAprJulOct

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts 0%25%50%75%100% JanAprJulOct Cloudy Partly Cloudy Clear

Machesney Park climate normals (1991–2020)

JanFebMarAprMayJunJulAugSepOctNovDec
Avg high (°C)−4−15131925262622156−1
Avg temp (°C)−8−607131921201692−5
Avg low (°C)−12−10−518131515104−3−8
Precipitation (mm)413954941101438510597706150
Snowfall (cm)2519113—————1726
Jan – JunJanFebMarAprMayJun
Avg high (°C)−4−15131925
Avg temp (°C)−8−6071319
Avg low (°C)−12−10−51813
Precipitation (mm)41395494110143
Snowfall (cm)2519113——
Jul – DecJulAugSepOctNovDec
Avg high (°C)262622156−1
Avg temp (°C)21201692−5
Avg low (°C)1515104−3−8
Precipitation (mm)8510597706150
Snowfall (cm)———1726

How often — frequency of weather events

JanFebMarAprMayJunJulAugSepOctNovDec
Days with measurable rain (days)978101211998989
Days with high ≥ 32°C (days)———0.00.32430.8———
Days with low ≤ 0°C (days)30262390.5———0.261928
Days with snowfall ≥ 2.5 cm (days)4310.5—————0.10.63
Jan – JunJanFebMarAprMayJun
Days with measurable rain (days)978101211
Days with high ≥ 32°C (days)———0.00.32
Days with low ≤ 0°C (days)30262390.5—
Days with snowfall ≥ 2.5 cm (days)4310.5——
Jul – DecJulAugSepOctNovDec
Days with measurable rain (days)998989
Days with high ≥ 32°C (days)430.8———
Days with low ≤ 0°C (days)——0.261928
Days with snowfall ≥ 2.5 cm (days)———0.10.63

Sky & atmosphere

JanFebMarAprMayJunJulAugSepOctNovDec
Cloud cover (%)666465666659525250616666
Clear days (≤ 30% cloud)5465578910755
Partly cloudy days (30–70%)1110991010131299109
Cloudy days (≥ 70%)161416161613101010151617
Relative humidity (%)898680767777777675778288
Wind speed (m/s)3.94.03.83.83.22.72.42.22.63.13.43.5
Jan – JunJanFebMarAprMayJun
Cloud cover (%)666465666659
Clear days (≤ 30% cloud)546557
Partly cloudy days (30–70%)1110991010
Cloudy days (≥ 70%)161416161613
Relative humidity (%)898680767777
Wind speed (m/s)3.94.03.83.83.22.7
Jul – DecJulAugSepOctNovDec
Cloud cover (%)525250616666
Clear days (≤ 30% cloud)8910755
Partly cloudy days (30–70%)131299109
Cloudy days (≥ 70%)101010151617
Relative humidity (%)777675778288
Wind speed (m/s)2.42.22.63.13.43.5
Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Beloit (NOAA GHCN station USC00470696), about 17 km from the city centre.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →