Washington, IL Weather & Climate Normals
What a normal year in Washington actually looks like
On the 30-year record NOAA keeps for Washington, IL, the comfort score comes out to 41/100, strongly seasonal: Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. Only 4 months a year land in the 55–75°F range this site treats as mild.
How much Washington's weather actually swings
Average temperatures in Washington run from 25°F in Jan up to 75°F in Jul, a 50°F seasonal swing, one of the widest gaps in this dataset.
Washington, month by month
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 33°F | 17°F | 2.05in | 6.8in |
| Feb | 38°F | 21°F | 1.76in | 5.2in |
| Mar | 50°F | 31°F | 2.44in | 2.8in |
| Apr | 63°F | 41°F | 3.77in | 0.8in |
| May | 74°F | 52°F | 4.77in | 0in |
| Jun | 83°F | 61°F | 4.05in | 0in |
| Jul | 86°F | 65°F | 3.86in | 0in |
| Aug | 84°F | 63°F | 3.74in | 0in |
| Sep | 80°F | 55°F | 3.21in | 0in |
| Oct | 67°F | 43°F | 3.14in | 0in |
| Nov | 51°F | 32°F | 2.64in | 1.5in |
| Dec | 39°F | 23°F | 2.04in | 5.2in |
If you're timing a visit, May, Jun, Aug, and Sep are Washington's mildest stretch; if you're moving there, you should plan around Jul's heat and Jan's cold instead.
How wet Washington actually gets
Over a typical year, Washington sees about 37.47in of precipitation a year across roughly 110 days with measurable rain or snow, with 22.3in of snow a year.
Washington against the rest of the country
Out of 4876 cities scored here, Washington comes in at 4400; within IL alone it ranks 290 of 330. Population is about 15,857.
Checking the actual forecast
These figures come from Congerville 2nw, IL US, the NOAA station 11.7 miles from Washington, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why this uses the nearest NOAA station · How the comfort score is calculated