Barnstable climate — normals and trends
Barnstable (United States) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.0 °C and it receives 1,169 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 August (20.2 °C on average) and the coldest is February (0.5 °C). Rainfall peaks in December.
Barnstable averages 55 frost days, 0 hot days (≥ 30 °C) and 118 rainy days per year.
Barnstable has warmed by +1.6 °C between 1940 and 2025, or +0.19 °C per decade. This trend is statistically significant.
The number of frost days there went from about 64 to 46 per year over the period.
The hottest day of the period reached 28.7 °C (on 28 July 2020) and the coldest -19.5 °C (on 16 January 2004).
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
BarnstableMassachusetts
- coords
- 41.70°, -70.30°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.0°C
Average daily high
11.7°C
Average daily low
8.5°C
Annual rainfall
1,169mm
Sunshine / day
8.6h
Mean relative humidity
79%
Average peak wind
32.7km/h
Seasonal range
19.7°C
Frost days (< 0 °C)
55 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
118 d/yr
Annual snowfall
67.9 cm
Average feels-like high
9.0 °C
Average feels-like low
4.1 °C
Average peak gust
46.6 km/h
Tropical nights (≥ 20 °C)
21 d/yr
Solar radiation
14.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.6 °C
since 1940
+0.2 °C per decade · r² = 0.36 · 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
28.7 °C
28 July 2020
Coldest day
-19.5 °C
16 January 2004
Wettest day
148 mm
7 October 1962
Windiest day
101.1 km/h
31 August 1954
Strongest gust
151.2 km/h
31 August 1954
Hottest feels-like
34.2 °C
20 July 2019
Coldest feels-like
-31.1 °C
4 February 2023
Snowiest day
36.3 cm
27 January 2015
Sunniest day
14.8 h
20 June 2025
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 | 1.6 °C | -1.5 °C | 59 mm | -50 mm |
| Feb | 2.4 °C | -0.4 °C | 93 mm | -7 mm |
| Mar | 6.3 °C | +1.7 °C | 128 mm | +16 mm |
| Apr | 9.7 °C | +1.6 °C | 124 mm | +21 mm |
| May | 13.9 °C | +1.5 °C | 85 mm | -8 mm |
| Jun | 19.2 °C | +1.9 °C | 52 mm | -26 mm |
| Jul | 22.8 °C | +1.7 °C | 83 mm | +15 mm |
| Aug | 21.3 °C | 0.0 °C | 41 mm | -41 mm |
| Sep | 19.7 °C | +0.9 °C | 39 mm | -52 mm |
| Oct | 15.3 °C | +0.7 °C | 151 mm | +44 mm |
| Nov | 10.2 °C | -0.1 °C | 66 mm | -47 mm |
| Dec | 4.8 °C | -1.0 °C | 107 mm | -9 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 Barnstable?
Barnstable has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 10.0 °C and it receives 1,169 mm of precipitation per year.
What is the hottest day ever recorded in Barnstable?
The hottest day measured in Barnstable between 1940 and 2025 was 28 July 2020, reaching 28.7 °C.
What is the coldest day in Barnstable?
The coldest day measured in Barnstable between 1940 and 2025 was 16 January 2004, at -19.5 °C.
Does it snow in Barnstable?
Yes. Barnstable gets on average 67.9 cm of snow per year and has around 55 frost days.
Has the climate of Barnstable warmed?
Yes: Barnstable warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Barnstable?
The wettest day measured in Barnstable between 1940 and 2025 was 7 October 1962, with 148 mm of rain in 24 hours.
What was the windiest day in Barnstable?
The windiest day measured in Barnstable between 1940 and 2025 was 31 August 1954, with winds reaching 101.1 km/h.
What is the warmest month in Barnstable?
The warmest month in Barnstable is August (20.2 °C on average); the coldest is February (0.5 °C).
How much does it rain in Barnstable?
Barnstable receives on average 1,169 mm of precipitation per year, spread over about 118 rainy days.
Is it sunny in Barnstable?
Barnstable 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 Barnstable?
The heaviest 24-hour snowfall measured in Barnstable between 1940 and 2025 was 27 January 2015, with 36.3 cm.
Are there tropical nights in Barnstable?
Yes: Barnstable has on average 21 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Barnstable?
In Barnstable, between 1940 and 2025, the highest apparent temperature reached 34.2 °C on 20 July 2019, and the lowest was -31.1 °C on 4 February 2023.
Compare Barnstable with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Barnstable