Plainfield climate — normals and trends
Plainfield (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 10.0 °C and it receives 1,173 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (22.5 °C on average) and the coldest is January (-2.5 °C). Rainfall peaks in August.
Plainfield averages 111 frost days, 20 hot days (≥ 30 °C) and 123 rainy days per year.
Plainfield has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.
The number of frost days there went from about 119 to 103 per year over the period.
The hottest day of the period reached 40.0 °C (on 18 July 2012) and the coldest -28.4 °C (on 13 February 1967).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
PlainfieldConnecticut
- coords
- 41.68°, -71.92°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.0°C
Average daily high
14.9°C
Average daily low
5.5°C
Annual rainfall
1,173mm
Sunshine / day
8.4h
Mean relative humidity
70%
Average peak wind
17.1km/h
Seasonal range
25.0°C
Frost days (< 0 °C)
111 d/yr
Hot days (≥ 30 °C)
20 d/yr
Rainy days (≥ 1 mm)
123 d/yr
Annual snowfall
93.4 cm
Average feels-like high
13.0 °C
Average feels-like low
2.6 °C
Average peak gust
41.4 km/h
Tropical nights (≥ 20 °C)
17 d/yr
Solar radiation
14.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °C
since 1940
+0.2 °C per decade · r² = 0.42 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
40.0 °C
18 July 2012
Coldest day
-28.4 °C
13 February 1967
Wettest day
115 mm
14 September 1944
Windiest day
51.5 km/h
19 August 1991
Strongest gust
135.4 km/h
25 November 1950
Hottest feels-like
43.1 °C
26 August 1948
Coldest feels-like
-33.5 °C
13 February 1967
Snowiest day
33.2 cm
24 February 1969
Sunniest day
14.7 h
13 June 2008
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 1.0 °C | -0.7 °C | 48 mm | -44 mm |
| Feb | 3.0 °C | 0.0 °C | 77 mm | -7 mm |
| Mar | 10.7 °C | +3.1 °C | 117 mm | +15 mm |
| Apr | 15.6 °C | +1.7 °C | 96 mm | -1 mm |
| May | 19.4 °C | -0.3 °C | 190 mm | +92 mm |
| Jun | 25.9 °C | +1.1 °C | 62 mm | -34 mm |
| Jul | 29.2 °C | +1.4 °C | 121 mm | +20 mm |
| Aug | 26.7 °C | +0.1 °C | 80 mm | -32 mm |
| Sep | 24.0 °C | +1.4 °C | 70 mm | -25 mm |
| Oct | 17.0 °C | +0.4 °C | 81 mm | -12 mm |
| Nov | 9.8 °C | -0.5 °C | 64 mm | -35 mm |
| Dec | 2.6 °C | -1.6 °C | 87 mm | -16 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Plainfield?
Plainfield has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.0 °C and it receives 1,173 mm of precipitation per year.
What is the hottest day ever recorded in Plainfield?
The hottest day measured in Plainfield between 1940 and 2025 was 18 July 2012, reaching 40.0 °C.
What is the coldest day in Plainfield?
The coldest day measured in Plainfield between 1940 and 2025 was 13 February 1967, at -28.4 °C.
Does it snow in Plainfield?
Yes. Plainfield gets on average 93.4 cm of snow per year and has around 111 frost days.
Has the climate of Plainfield warmed?
Yes: Plainfield warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Plainfield?
The wettest day measured in Plainfield between 1940 and 2025 was 14 September 1944, with 115 mm of rain in 24 hours.
What was the windiest day in Plainfield?
The windiest day measured in Plainfield between 1940 and 2025 was 19 August 1991, with winds reaching 51.5 km/h.
What is the warmest month in Plainfield?
The warmest month in Plainfield is July (22.5 °C on average); the coldest is January (-2.5 °C).
How much does it rain in Plainfield?
Plainfield receives on average 1,173 mm of precipitation per year, spread over about 123 rainy days.
Is it sunny in Plainfield?
Plainfield gets on average 8.4 hours of sunshine per day, roughly 3,066 hours per year over 1940-2025.
What is the biggest single-day snowfall in Plainfield?
The heaviest 24-hour snowfall measured in Plainfield between 1940 and 2025 was 24 February 1969, with 33.2 cm.
Are there tropical nights in Plainfield?
Yes: Plainfield has on average 17 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Plainfield?
In Plainfield, between 1940 and 2025, the highest apparent temperature reached 43.1 °C on 26 August 1948, and the lowest was -33.5 °C on 13 February 1967.
Compare Plainfield with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Plainfield