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Plainfield, IL Climate
1991 to 2020 normals at Romeoville WFO, 8.1 mi from the center of Plainfield, elevation 660 ft.
Average weather by month
Select a month for daily normals and last year's weather
| Month | Range | High | Low | Precip. | Snow |
|---|---|---|---|---|---|
| January | 32° | 16° | 2.19 in | 10.6 in | |
| February | 36° | 20° | 1.98 in | 8.7 in | |
| March | 49° | 30° | 2.71 in | 4.2 in | |
| April | 61° | 40° | 4.11 in | 0.9 in | |
| May | 72° | 50° | 4.81 in | 0.0 in | |
| June | 82° | 60° | 4.68 in | 0.0 in | |
| July | 85° | 65° | 4.50 in | 0.0 in | |
| August | 83° | 63° | 4.36 in | 0.0 in | |
| September | 76° | 55° | 3.31 in | 0.0 in | |
| October | 64° | 44° | 3.67 in | 0.1 in | |
| November | 49° | 32° | 2.67 in | 1.2 in | |
| December | 37° | 22° | 2.15 in | 7.5 in | |
| Year | 60° | 41.14 in | 33.2 in |
Frequently asked questions
- What is the hottest month in Plainfield, IL?
- July is the warmest month, with a normal high of 85°F at Romeoville WFO.
- What is the coldest month in Plainfield, IL?
- January is the coldest month, with a normal low of 16°F.
- What is the wettest month in Plainfield, IL?
- May has the most precipitation on average, about 4.81 inches.