Jamestown climate — normals and trends
Jamestown (United States) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 7.7 °C and it receives 1,240 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 (19.8 °C on average) and the coldest is January (-5.1 °C). Rainfall peaks in June.
Jamestown averages 136 frost days, 3 hot days (≥ 30 °C) and 171 rainy days per year.
Jamestown has warmed by +1.8 °C between 1940 and 2025, or +0.21 °C per decade. This trend is statistically significant.
The number of frost days there went from about 148 to 124 per year over the period.
The hottest day of the period reached 34.8 °C (on 25 June 1988) and the coldest -28.3 °C (on 16 February 2015).
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
JamestownNew York
- coords
- 42.10°, -79.24°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
7.7°C
Average daily high
12.4°C
Average daily low
3.3°C
Annual rainfall
1,240mm
Sunshine / day
8.2h
Mean relative humidity
77%
Average peak wind
16.9km/h
Seasonal range
24.9°C
Frost days (< 0 °C)
136 d/yr
Hot days (≥ 30 °C)
3 d/yr
Rainy days (≥ 1 mm)
171 d/yr
Annual snowfall
164.2 cm
Average feels-like high
10.4 °C
Average feels-like low
0.3 °C
Average peak gust
40.8 km/h
Tropical nights (≥ 20 °C)
3 d/yr
Solar radiation
13.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.38 · 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
34.8 °C
25 June 1988
Coldest day
-28.3 °C
16 February 2015
Wettest day
107 mm
15 October 1954
Windiest day
44.5 km/h
6 April 1979
Strongest gust
114.8 km/h
22 December 2013
Hottest feels-like
39.2 °C
14 July 1995
Coldest feels-like
-35.1 °C
21 January 1985
Snowiest day
26.9 cm
3 April 2005
Sunniest day
14.9 h
21 June 1941
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 | -3.6 °C | -2.3 °C | 71 mm | -19 mm |
| Feb | -0.3 °C | -0.4 °C | 91 mm | +11 mm |
| Mar | 10.4 °C | +5.1 °C | 69 mm | -34 mm |
| Apr | 13.7 °C | +1.4 °C | 129 mm | +17 mm |
| May | 17.0 °C | -1.2 °C | 198 mm | +77 mm |
| Jun | 24.4 °C | +1.8 °C | 162 mm | +39 mm |
| Jul | 26.7 °C | +1.9 °C | 77 mm | -33 mm |
| Aug | 24.2 °C | +0.4 °C | 50 mm | -56 mm |
| Sep | 22.9 °C | +2.6 °C | 60 mm | -37 mm |
| Oct | 15.3 °C | +1.1 °C | 115 mm | +20 mm |
| Nov | 6.4 °C | -0.8 °C | 109 mm | +6 mm |
| Dec | 0.2 °C | -0.9 °C | 104 mm | +4 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 Jamestown?
Jamestown has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 7.7 °C and it receives 1,240 mm of precipitation per year.
What is the hottest day ever recorded in Jamestown?
The hottest day measured in Jamestown between 1940 and 2025 was 25 June 1988, reaching 34.8 °C.
What is the coldest day in Jamestown?
The coldest day measured in Jamestown between 1940 and 2025 was 16 February 2015, at -28.3 °C.
Does it snow in Jamestown?
Yes. Jamestown gets on average 164.2 cm of snow per year and has around 136 frost days.
Has the climate of Jamestown warmed?
Yes: Jamestown warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Jamestown?
The wettest day measured in Jamestown between 1940 and 2025 was 15 October 1954, with 107 mm of rain in 24 hours.
What was the windiest day in Jamestown?
The windiest day measured in Jamestown between 1940 and 2025 was 6 April 1979, with winds reaching 44.5 km/h.
What is the warmest month in Jamestown?
The warmest month in Jamestown is July (19.8 °C on average); the coldest is January (-5.1 °C).
How much does it rain in Jamestown?
Jamestown receives on average 1,240 mm of precipitation per year, spread over about 171 rainy days.
Is it sunny in Jamestown?
Jamestown gets on average 8.2 hours of sunshine per day, roughly 2,993 hours per year over 1940-2025.
What is the biggest single-day snowfall in Jamestown?
The heaviest 24-hour snowfall measured in Jamestown between 1940 and 2025 was 3 April 2005, with 26.9 cm.
Are there tropical nights in Jamestown?
Yes: Jamestown has on average 3 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Jamestown?
In Jamestown, between 1940 and 2025, the highest apparent temperature reached 39.2 °C on 14 July 1995, and the lowest was -35.1 °C on 21 January 1985.
Compare Jamestown with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Jamestown