Plainfield, IL Weather & Climate Normals
What a normal year in Plainfield actually looks like
On the 30-year record NOAA keeps for Plainfield, IL, the comfort score comes out to 44/100, strongly seasonal: Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. Only 5 months a year land in the 55–75°F range this site treats as mild.
How much Plainfield's weather actually swings
Average temperatures in Plainfield run from 24°F in Jan up to 75°F in Jul, a 50.7°F seasonal swing, one of the widest gaps in this dataset.
Plainfield, month by month
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 32°F | 16°F | 2.19in | 10.6in |
| Feb | 36°F | 20°F | 1.98in | 8.7in |
| Mar | 49°F | 30°F | 2.71in | 4.2in |
| Apr | 61°F | 40°F | 4.11in | 0.9in |
| May | 72°F | 50°F | 4.81in | 0in |
| Jun | 82°F | 60°F | 4.68in | 0in |
| Jul | 85°F | 65°F | 4.5in | 0in |
| Aug | 83°F | 63°F | 4.36in | 0in |
| Sep | 76°F | 55°F | 3.31in | 0in |
| Oct | 64°F | 44°F | 3.67in | 0.1in |
| Nov | 49°F | 32°F | 2.67in | 1.2in |
| Dec | 37°F | 22°F | 2.15in | 7.5in |
If you're timing a visit, May, Jun, Jul, Aug, and Sep are Plainfield's mildest stretch; if you're moving there, you should plan around Jan's cold instead.
How wet Plainfield actually gets
Over a typical year, Plainfield sees about 41.14in of precipitation a year across roughly 127 days with measurable rain or snow, with 33.2in of snow a year.
Plainfield against the rest of the country
Out of 4876 cities scored here, Plainfield comes in at 3693; within IL alone it ranks 166 of 330. Population is about 48,881.
Checking the actual forecast
These figures come from Romeoville Wfo, IL US, the NOAA station 7.4 miles from Plainfield, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why some cities show no snow or rain figure · What a 30-year climate normal actually is