Plainfield, Indiana Climate by Month
Plainfield, Indiana, United States
Warm summers and cold winters, with rain spread through the year.
Plainfield has warm summers and cold winters, with rain spread through the year. Expect highs of 85°F (30°C) in July and 36°F (2°C) in January, with the coldest nights (January) near 20°F (-7°C). It gets 42 in (1072 mm) of rain a year, spread across the months.
- Warmest month
- 85°F(30°C)
- Average high, July
- Coldest nights
- 20°F(-7°C)
- Average low, January
- Rain per year
- 42 in(1072 mm)
- No clear rainy season
- Humidity
- 75%
- Sunniest: July
Best and worst months in Plainfield
Best for weatherThe most comfortable weather comes in May and September, with highs around 77°F (25°C) and about 3.9 in (99 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 36°F (2°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Plainfield weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 36°F(2°C) | 20°F(-7°C) | 2.8 in(72 mm) | 97% | 1.6 |
| FebFebruary | 40°F(5°C) | 22°F(-5°C) | 2.6 in(65 mm) | 84% | 2.6 |
| MarMarch | 51°F(11°C) | 32°F(0°C) | 3.4 in(87 mm) | 79% | 3.7 |
| AprApril | 64°F(18°C) | 42°F(5°C) | 4.2 in(107 mm) | 66% | 4.6 |
| MayMayBest | 74°F(23°C) | 52°F(11°C) | 4.7 in(120 mm) | 71% | 5.2 |
| JunJune | 82°F(28°C) | 61°F(16°C) | 4.3 in(108 mm) | 72% | 5.9 |
| JulJuly | 85°F(30°C) | 64°F(18°C) | 4.3 in(108 mm) | 71% | 6.0 |
| AugAugust | 85°F(29°C) | 63°F(17°C) | 3.2 in(82 mm) | 74% | 5.4 |
| SepSeptemberBest | 80°F(26°C) | 55°F(13°C) | 3.0 in(77 mm) | 66% | 4.5 |
| OctOctober | 67°F(20°C) | 43°F(6°C) | 3.0 in(75 mm) | 67% | 3.1 |
| NovNovember | 53°F(11°C) | 33°F(1°C) | 3.5 in(90 mm) | 75% | 1.9 |
| DecDecember | 40°F(5°C) | 25°F(-4°C) | 3.2 in(81 mm) | 80% | 1.4 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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