Stoneham climate — normals and trends
Stoneham (United States) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.8 °C and it receives 1,115 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 (21.6 °C on average) and the coldest is January (-2.1 °C). Rainfall peaks in December.
Stoneham averages 94 frost days, 5 hot days (≥ 30 °C) and 120 rainy days per year.
Stoneham 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 103 to 85 per year over the period.
The hottest day of the period reached 34.9 °C (on 22 July 2011) and the coldest -23.9 °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
StonehamMassachusetts
- coords
- 42.48°, -71.10°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.8°C
Average daily high
13.4°C
Average daily low
6.3°C
Annual rainfall
1,115mm
Sunshine / day
8.6h
Mean relative humidity
71%
Average peak wind
21.0km/h
Seasonal range
23.7°C
Frost days (< 0 °C)
94 d/yr
Hot days (≥ 30 °C)
5 d/yr
Rainy days (≥ 1 mm)
120 d/yr
Annual snowfall
102.6 cm
Average feels-like high
11.3 °C
Average feels-like low
3.0 °C
Average peak gust
39.9 km/h
Tropical nights (≥ 20 °C)
16 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 = 0.39 · 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
34.9 °C
22 July 2011
Coldest day
-23.9 °C
13 February 1967
Wettest day
150 mm
19 August 1955
Windiest day
66.6 km/h
31 August 1954
Strongest gust
134.6 km/h
26 November 1950
Hottest feels-like
39.8 °C
26 August 1948
Coldest feels-like
-32.0 °C
4 February 2023
Snowiest day
32.4 cm
27 January 2015
Sunniest day
14.8 h
12 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 | 1.0 °C | -0.4 °C | 50 mm | -46 mm |
| Feb | 2.0 °C | -0.4 °C | 95 mm | +6 mm |
| Mar | 8.9 °C | +2.7 °C | 112 mm | +5 mm |
| Apr | 13.4 °C | +1.8 °C | 117 mm | +15 mm |
| May | 17.2 °C | +0.2 °C | 161 mm | +71 mm |
| Jun | 22.9 °C | +0.8 °C | 56 mm | -28 mm |
| Jul | 26.6 °C | +1.3 °C | 73 mm | -3 mm |
| Aug | 24.2 °C | -0.4 °C | 33 mm | -52 mm |
| Sep | 21.8 °C | +0.9 °C | 68 mm | -15 mm |
| Oct | 16.4 °C | +0.9 °C | 109 mm | +14 mm |
| Nov | 9.5 °C | -0.3 °C | 66 mm | -38 mm |
| Dec | 2.6 °C | -1.5 °C | 87 mm | -20 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 Stoneham?
Stoneham has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 9.8 °C and it receives 1,115 mm of precipitation per year.
What is the hottest day ever recorded in Stoneham?
The hottest day measured in Stoneham between 1940 and 2025 was 22 July 2011, reaching 34.9 °C.
What is the coldest day in Stoneham?
The coldest day measured in Stoneham between 1940 and 2025 was 13 February 1967, at -23.9 °C.
Does it snow in Stoneham?
Yes. Stoneham gets on average 102.6 cm of snow per year and has around 94 frost days.
Has the climate of Stoneham warmed?
Yes: Stoneham warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Stoneham?
The wettest day measured in Stoneham between 1940 and 2025 was 19 August 1955, with 150 mm of rain in 24 hours.
What was the windiest day in Stoneham?
The windiest day measured in Stoneham between 1940 and 2025 was 31 August 1954, with winds reaching 66.6 km/h.
What is the warmest month in Stoneham?
The warmest month in Stoneham is July (21.6 °C on average); the coldest is January (-2.1 °C).
How much does it rain in Stoneham?
Stoneham receives on average 1,115 mm of precipitation per year, spread over about 120 rainy days.
Is it sunny in Stoneham?
Stoneham 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 Stoneham?
The heaviest 24-hour snowfall measured in Stoneham between 1940 and 2025 was 27 January 2015, with 32.4 cm.
Are there tropical nights in Stoneham?
Yes: Stoneham has on average 16 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Stoneham?
In Stoneham, between 1940 and 2025, the highest apparent temperature reached 39.8 °C on 26 August 1948, and the lowest was -32.0 °C on 4 February 2023.
Compare Stoneham with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Stoneham