New London climate — normals and trends
New London (United States) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.8 °C and it receives 1,203 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 (21.4 °C on average) and the coldest is January (0.5 °C). Rainfall peaks in December.
New London averages 60 frost days, 0 hot days (≥ 30 °C) and 119 rainy days per year.
New London has warmed by +1.3 °C between 1940 and 2025, or +0.16 °C per decade. This trend is statistically significant.
The number of frost days there went from about 69 to 51 per year over the period.
The hottest day of the period reached 30.2 °C (on 2 August 1975) and the coldest -19.6 °C (on 14 February 2016).
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
New LondonConnecticut
- coords
- 41.36°, -72.10°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.8°C
Average daily high
13.0°C
Average daily low
8.6°C
Annual rainfall
1,203mm
Sunshine / day
8.9h
Mean relative humidity
75%
Average peak wind
27.9km/h
Seasonal range
20.9°C
Frost days (< 0 °C)
60 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
119 d/yr
Annual snowfall
60.4 cm
Average feels-like high
10.7 °C
Average feels-like low
4.9 °C
Average peak gust
43.2 km/h
Tropical nights (≥ 20 °C)
33 d/yr
Solar radiation
15.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.3 °C
since 1940
+0.2 °C per decade · r² = 0.32 · 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
30.2 °C
2 August 1975
Coldest day
-19.6 °C
14 February 2016
Wettest day
143 mm
14 October 2005
Windiest day
91.2 km/h
12 September 1960
Strongest gust
146.5 km/h
27 September 1985
Hottest feels-like
35.0 °C
2 August 1975
Coldest feels-like
-28.6 °C
14 February 2016
Snowiest day
32.4 cm
16 February 1958
Sunniest day
14.6 h
16 June 2024
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 | 2.0 °C | -1.2 °C | 46 mm | -60 mm |
| Feb | 3.2 °C | 0.0 °C | 95 mm | -1 mm |
| Mar | 7.7 °C | +1.9 °C | 119 mm | +5 mm |
| Apr | 11.0 °C | +1.1 °C | 96 mm | -10 mm |
| May | 14.8 °C | +0.4 °C | 168 mm | +68 mm |
| Jun | 20.3 °C | +0.8 °C | 47 mm | -35 mm |
| Jul | 24.3 °C | +1.1 °C | 68 mm | -9 mm |
| Aug | 23.0 °C | -0.3 °C | 49 mm | -46 mm |
| Sep | 21.6 °C | +1.0 °C | 56 mm | -40 mm |
| Oct | 16.6 °C | +0.6 °C | 101 mm | -1 mm |
| Nov | 11.1 °C | 0.0 °C | 69 mm | -44 mm |
| Dec | 4.9 °C | -1.2 °C | 90 mm | -27 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 New London?
New London has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 10.8 °C and it receives 1,203 mm of precipitation per year.
What is the hottest day ever recorded in New London?
The hottest day measured in New London between 1940 and 2025 was 2 August 1975, reaching 30.2 °C.
What is the coldest day in New London?
The coldest day measured in New London between 1940 and 2025 was 14 February 2016, at -19.6 °C.
Does it snow in New London?
Yes. New London gets on average 60.4 cm of snow per year and has around 60 frost days.
Has the climate of New London warmed?
Yes: New London warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in New London?
The wettest day measured in New London between 1940 and 2025 was 14 October 2005, with 143 mm of rain in 24 hours.
What was the windiest day in New London?
The windiest day measured in New London between 1940 and 2025 was 12 September 1960, with winds reaching 91.2 km/h.
What is the warmest month in New London?
The warmest month in New London is July (21.4 °C on average); the coldest is January (0.5 °C).
How much does it rain in New London?
New London receives on average 1,203 mm of precipitation per year, spread over about 119 rainy days.
Is it sunny in New London?
New London gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.
What is the biggest single-day snowfall in New London?
The heaviest 24-hour snowfall measured in New London between 1940 and 2025 was 16 February 1958, with 32.4 cm.
Are there tropical nights in New London?
Yes: New London has on average 33 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in New London?
In New London, between 1940 and 2025, the highest apparent temperature reached 35.0 °C on 2 August 1975, and the lowest was -28.6 °C on 14 February 2016.
Compare New London with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around New London