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Rock Falls, IL weather and climate

Whiteside County, IL · population 8,683 · about 653 ft elevation

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

The year at a glance

Sunny days
188
clear or partly cloudy, per year
Precipitation
38 in
per year
Wet days
121
rain or snow per year
Snowfall
29 in
per year
Hot days
13
above 90 °F
Freezing nights
137
at or below 32 °F
Humidity
71%
average relative
Average temperature
49 °F
year round

Monthly temperatures

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

Daily highDaily low
255075JanMarMayJulSepNovDaily high, Jan: 29 °FDaily high, Feb: 34 °FDaily high, Mar: 46 °FDaily high, Apr: 60 °FDaily high, May: 71 °FDaily high, Jun: 80 °FDaily high, Jul: 83 °FDaily high, Aug: 81 °FDaily high, Sep: 75 °FDaily high, Oct: 63 °FDaily high, Nov: 47 °FDaily high, Dec: 35 °FDaily low, Jan: 13 °FDaily low, Feb: 17 °FDaily low, Mar: 28 °FDaily low, Apr: 38 °FDaily low, May: 50 °FDaily low, Jun: 60 °FDaily low, Jul: 64 °FDaily low, Aug: 61 °FDaily low, Sep: 53 °FDaily low, Oct: 41 °FDaily low, Nov: 30 °FDaily low, Dec: 19 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Daily high293446607180838175634735
Daily low131728385060646153413019

Monthly precipitation

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

0.02.04.0JanMarMayJulSepNovRock Falls, Jan: 1.9 inRock Falls, Feb: 1.9 inRock Falls, Mar: 2.6 inRock Falls, Apr: 4.3 inRock Falls, May: 4.7 inRock Falls, Jun: 4.5 inRock Falls, Jul: 3.7 inRock Falls, Aug: 3.3 inRock Falls, Sep: 3.4 inRock Falls, Oct: 2.9 inRock Falls, Nov: 2.5 inRock Falls, Dec: 2.2 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Rock Falls1.91.92.64.34.74.53.73.33.42.92.52.2

Monthly sunny days

Days each month with clear or partly cloudy skies.

01020JanMarMayJulSepNovRock Falls, Jan: 13 daysRock Falls, Feb: 12 daysRock Falls, Mar: 14 daysRock Falls, Apr: 13 daysRock Falls, May: 15 daysRock Falls, Jun: 16 daysRock Falls, Jul: 20 daysRock Falls, Aug: 21 daysRock Falls, Sep: 20 daysRock Falls, Oct: 17 daysRock Falls, Nov: 15 daysRock Falls, Dec: 13 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Rock Falls131214131516202120171513

Compare Rock Falls 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).