Weymouth climate — normals and trends
Weymouth (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 10.1 °C and it receives 1,100 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 (22.0 °C on average) and the coldest is January (-1.7 °C). Rainfall peaks in December.
Weymouth averages 91 frost days, 8 hot days (≥ 30 °C) and 119 rainy days per year.
Weymouth has warmed by +1.6 °C between 1940 and 2025, or +0.18 °C per decade. This trend is statistically significant.
The number of frost days there went from about 100 to 82 per year over the period.
The hottest day of the period reached 36.7 °C (on 22 July 2011) and the coldest -23.7 °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
WeymouthMassachusetts
- coords
- 42.22°, -70.94°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.1°C
Average daily high
13.9°C
Average daily low
6.5°C
Annual rainfall
1,100mm
Sunshine / day
8.6h
Mean relative humidity
72%
Average peak wind
20.8km/h
Seasonal range
23.7°C
Frost days (< 0 °C)
91 d/yr
Hot days (≥ 30 °C)
8 d/yr
Rainy days (≥ 1 mm)
119 d/yr
Annual snowfall
96.6 cm
Average feels-like high
11.9 °C
Average feels-like low
3.4 °C
Average peak gust
40.7 km/h
Tropical nights (≥ 20 °C)
19 d/yr
Solar radiation
14.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.6 °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
36.7 °C
22 July 2011
Coldest day
-23.7 °C
13 February 1967
Wettest day
137 mm
19 August 1955
Windiest day
67.1 km/h
31 August 1954
Strongest gust
136.8 km/h
31 August 1954
Hottest feels-like
40.1 °C
2 August 1975
Coldest feels-like
-30.9 °C
4 February 2023
Snowiest day
33.6 cm
27 January 2015
Sunniest day
14.8 h
16 June 1952
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 1.4 °C | -0.5 °C | 53 mm | -44 mm |
| Feb | 2.5 °C | -0.3 °C | 93 mm | +5 mm |
| Mar | 9.3 °C | +2.7 °C | 106 mm | +1 mm |
| Apr | 14.0 °C | +1.9 °C | 107 mm | +8 mm |
| May | 17.9 °C | +0.3 °C | 148 mm | +60 mm |
| Jun | 23.7 °C | +1.0 °C | 63 mm | -20 mm |
| Jul | 27.2 °C | +1.2 °C | 78 mm | +4 mm |
| Aug | 24.7 °C | -0.5 °C | 33 mm | -51 mm |
| Sep | 22.2 °C | +0.8 °C | 66 mm | -16 mm |
| Oct | 16.7 °C | +0.7 °C | 103 mm | +10 mm |
| Nov | 9.9 °C | -0.3 °C | 63 mm | -38 mm |
| Dec | 3.0 °C | -1.5 °C | 89 mm | -17 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 Weymouth?
Weymouth has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.1 °C and it receives 1,100 mm of precipitation per year.
What is the hottest day ever recorded in Weymouth?
The hottest day measured in Weymouth between 1940 and 2025 was 22 July 2011, reaching 36.7 °C.
What is the coldest day in Weymouth?
The coldest day measured in Weymouth between 1940 and 2025 was 13 February 1967, at -23.7 °C.
Does it snow in Weymouth?
Yes. Weymouth gets on average 96.6 cm of snow per year and has around 91 frost days.
Has the climate of Weymouth warmed?
Yes: Weymouth warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Weymouth?
The wettest day measured in Weymouth between 1940 and 2025 was 19 August 1955, with 137 mm of rain in 24 hours.
What was the windiest day in Weymouth?
The windiest day measured in Weymouth between 1940 and 2025 was 31 August 1954, with winds reaching 67.1 km/h.
What is the warmest month in Weymouth?
The warmest month in Weymouth is July (22.0 °C on average); the coldest is January (-1.7 °C).
How much does it rain in Weymouth?
Weymouth receives on average 1,100 mm of precipitation per year, spread over about 119 rainy days.
Is it sunny in Weymouth?
Weymouth gets on average 8.6 hours of sunshine per day, roughly 3,139 hours per year over 1940-2025.
What is the biggest single-day snowfall in Weymouth?
The heaviest 24-hour snowfall measured in Weymouth between 1940 and 2025 was 27 January 2015, with 33.6 cm.
Are there tropical nights in Weymouth?
Yes: Weymouth has on average 19 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Weymouth?
In Weymouth, between 1940 and 2025, the highest apparent temperature reached 40.1 °C on 2 August 1975, and the lowest was -30.9 °C on 4 February 2023.
Compare Weymouth with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Weymouth