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Arlington Heights, IL weather and climate

Cook County, IL · population 76,220 · about 728 ft elevation

Everything below is a 30 year average for 1991-2020, computed from daily climate history at Arlington Heights's own coordinates.

The year at a glance

Sunny days
182
clear or partly cloudy, per year
Precipitation
37 in
per year
Wet days
127
rain or snow per year
Snowfall
37 in
per year
Hot days
15
above 90 °F
Freezing nights
121
at or below 32 °F
Humidity
71%
average relative
Average temperature
51 °F
year round

Monthly temperatures

Average daily high and low for each month, in °F.

Daily highDaily low
20406080JanMarMayJulSepNovDaily high, Jan: 31 °FDaily high, Feb: 35 °FDaily high, Mar: 46 °FDaily high, Apr: 58 °FDaily high, May: 69 °FDaily high, Jun: 79 °FDaily high, Jul: 84 °FDaily high, Aug: 82 °FDaily high, Sep: 75 °FDaily high, Oct: 62 °FDaily high, Nov: 48 °FDaily high, Dec: 37 °FDaily low, Jan: 18 °FDaily low, Feb: 21 °FDaily low, Mar: 30 °FDaily low, Apr: 39 °FDaily low, May: 50 °FDaily low, Jun: 60 °FDaily low, Jul: 65 °FDaily low, Aug: 64 °FDaily low, Sep: 56 °FDaily low, Oct: 44 °FDaily low, Nov: 33 °FDaily low, Dec: 23 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Daily high313546586979848275624837
Daily low182130395060656456443323

Monthly precipitation

Total rain plus melted snow for each month, in inches.

0.02.04.0JanMarMayJulSepNovArlington Heights, Jan: 2.1 inArlington Heights, Feb: 1.9 inArlington Heights, Mar: 2.5 inArlington Heights, Apr: 4.3 inArlington Heights, May: 4.4 inArlington Heights, Jun: 3.9 inArlington Heights, Jul: 3.6 inArlington Heights, Aug: 3.7 inArlington Heights, Sep: 2.9 inArlington Heights, Oct: 3.1 inArlington Heights, Nov: 2.4 inArlington Heights, Dec: 2.1 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Arlington Heights2.11.92.54.34.43.93.63.72.93.12.42.1

Monthly sunny days

Days each month with clear or partly cloudy skies.

01020JanMarMayJulSepNovArlington Heights, Jan: 11 daysArlington Heights, Feb: 11 daysArlington Heights, Mar: 14 daysArlington Heights, Apr: 14 daysArlington Heights, May: 15 daysArlington Heights, Jun: 16 daysArlington Heights, Jul: 20 daysArlington Heights, Aug: 20 daysArlington Heights, Sep: 20 daysArlington Heights, Oct: 16 daysArlington Heights, Nov: 14 daysArlington Heights, Dec: 12 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Arlington Heights111114141516202020161412

Compare Arlington Heights with another city

Nearby cities and popular picks. Any two cities can be compared from the home page.

See weather for every covered Illinois city

About this data

Figures are 30 year averages for 1991-2020. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.

Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).