Washington, Illinois Climate
United States
Pop. 16,664 Elev. 232 m / 761 ft
TZ: America/Chicago (UTC-5) ·
Washington is largely arid, with warm summers peaking at 88°F (31°C) in July and cold winters around 17°F (-8°C) in January. Humidity pushes the summer feels-like temperature to 101°F (38°C), while wind chill can drive winter lows to 9°F (-13°C). Precipitation occurs on roughly 43 days per year (28.6 in / 726 mm total), with snow on 3 days and 29 in (742 mm) of annual accumulation. The city averages 128 sunny days per year and around 31 thunderstorm days. Nearby lake water reaches 79°F (26°C) in summer.
| Temperature | 88°F (31°C) high | 17°F (-8°C) low |
| Feels like | 101°F (38°C) high | 9°F (-13°C) low |
| Rain | 43 days | 28.6 in (726 mm) /yr |
| Snow | 3 days | 29.2 in (742 mm) /yr |
| Sky | 128 sunny | 31 stormy |
| Wind | 2.7 mph (1.2 m/s) avg |
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Explore on the MapMonthly Climate Chart
Best months to visit: Aug, Sep, Oct
Sky & Air by Month
Cloud cover (%)
52
Jan 60
Feb 52
Mar 66
Apr 57
May 52
Jun 67
Jul 51
Aug 37
Sep 45
Oct 52
Nov 71
Dec Humidity (%)
63
Jan 65
Feb 58
Mar 61
Apr 59
May 67
Jun 73
Jul 73
Aug 60
Sep 61
Oct 66
Nov 78
Dec Weather Days by Month
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 15 mi General Wayne A. Downing Peoria International Airport (PIA)
Ski resort 101 mi
National park 116 mi Historic Pullman Foundation Exhibit Hall
Hospital 7 mi Carle Eureka Hospital
Hiking trail 3 mi Meadow Valley Park
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 32°F 0°C | 17°F -8°C | 0.4 in 10 mm | 5.0 in128 mm | 15 |
| February | 38°F 3°C | 22°F -6°C | 0.2 in 6 mm | 4.8 in123 mm | 8 |
| March | 60°F 15°C | 38°F 3°C | 3.1 in 80 mm | 4.2 in106 mm | 12 |
| April | 65°F 18°C | 46°F 8°C | 3.6 in 91 mm | — | 5 |
| May | 74°F 23°C | 53°F 12°C | 3.5 in 89 mm | — | 10 |
| June | 85°F 29°C | 66°F 19°C | 3.6 in 91 mm | — | 10 |
| July | 88°F 31°C | 71°F 22°C | 5.4 in 138 mm | — | 6 |
| August | 82°F 28°C | 64°F 18°C | 2.7 in 68 mm | — | 13 |
| September | 82°F 28°C | 58°F 14°C | 1.2 in 31 mm | — | 19 |
| October | 71°F 21°C | 50°F 10°C | 2.1 in 53 mm | — | 14 |
| November | 52°F 11°C | 36°F 2°C | 1.4 in 36 mm | 7.8 in199 mm | 10 |
| December | 37°F 3°C | 21°F -6°C | 1.4 in 35 mm | 7.3 in186 mm | 6 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 15 | 0 |
| February | 8 | 0 |
| March | 12 | 4 |
| April | 5 | 5 |
| May | 10 | 2 |
| June | 10 | 2 |
| July | 6 | 7 |
| August | 13 | 5 |
| September | 19 | 2 |
| October | 14 | 1 |
| November | 10 | 2 |
| December | 6 | 1 |
Water Temperatures Data
↑ See chart| Month | Lake Avg High |
|---|---|
| January | 32°F 0°C |
| February | 32°F 0°C |
| March | 42°F 6°C |
| April | 53°F 12°C |
| May | 61°F 16°C |
| June | 73°F 23°C |
| July | 79°F 26°C |
| August | 75°F 24°C |
| September | 68°F 20°C |
| October | 59°F 15°C |
| November | 43°F 6°C |
| December | 32°F 0°C |