Sewell climate — normals and trends
Sewell (United States) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 13.0 °C and it receives 1,057 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 (25.0 °C on average) and the coldest is January (0.7 °C). Rainfall peaks in August.
Sewell averages 78 frost days, 39 hot days (≥ 30 °C) and 114 rainy days per year.
Sewell 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 86 to 70 per year over the period.
The hottest day of the period reached 39.3 °C (on 3 July 1966) and the coldest -22.7 °C (on 22 January 1961).
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
SewellNew Jersey
- coords
- 39.77°, -75.14°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
13.0°C
Average daily high
17.6°C
Average daily low
8.6°C
Annual rainfall
1,057mm
Sunshine / day
8.9h
Mean relative humidity
67%
Average peak wind
17.3km/h
Seasonal range
24.3°C
Frost days (< 0 °C)
78 d/yr
Hot days (≥ 30 °C)
39 d/yr
Rainy days (≥ 1 mm)
114 d/yr
Annual snowfall
45.5 cm
Average feels-like high
16.4 °C
Average feels-like low
6.4 °C
Average peak gust
37.6 km/h
Tropical nights (≥ 20 °C)
52 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 = 0.38 · 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
39.3 °C
3 July 1966
Coldest day
-22.7 °C
22 January 1961
Wettest day
147 mm
16 September 1999
Windiest day
52.6 km/h
12 September 1960
Strongest gust
133.9 km/h
9 January 2024
Hottest feels-like
45.6 °C
15 July 1995
Coldest feels-like
-28.7 °C
21 January 1985
Snowiest day
39.0 cm
20 March 1958
Sunniest day
14.1 h
1 July 1943
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 | 2.9 °C | -1.7 °C | 33 mm | -47 mm |
| Feb | 6.5 °C | +0.2 °C | 61 mm | -14 mm |
| Mar | 15.3 °C | +4.2 °C | 93 mm | -4 mm |
| Apr | 18.9 °C | +1.6 °C | 80 mm | -12 mm |
| May | 22.7 °C | 0.0 °C | 139 mm | +48 mm |
| Jun | 28.7 °C | +1.4 °C | 67 mm | -19 mm |
| Jul | 31.3 °C | +1.7 °C | 190 mm | +93 mm |
| Aug | 27.5 °C | -1.1 °C | 26 mm | -72 mm |
| Sep | 26.2 °C | +1.1 °C | 84 mm | -3 mm |
| Oct | 19.6 °C | +0.5 °C | 59 mm | -22 mm |
| Nov | 13.0 °C | +0.1 °C | 46 mm | -38 mm |
| Dec | 4.8 °C | -2.1 °C | 64 mm | -26 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 Sewell?
Sewell has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 13.0 °C and it receives 1,057 mm of precipitation per year.
What is the hottest day ever recorded in Sewell?
The hottest day measured in Sewell between 1940 and 2025 was 3 July 1966, reaching 39.3 °C.
What is the coldest day in Sewell?
The coldest day measured in Sewell between 1940 and 2025 was 22 January 1961, at -22.7 °C.
Does it snow in Sewell?
Yes. Sewell gets on average 45.5 cm of snow per year and has around 78 frost days.
Has the climate of Sewell warmed?
Yes: Sewell warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sewell?
The wettest day measured in Sewell between 1940 and 2025 was 16 September 1999, with 147 mm of rain in 24 hours.
What was the windiest day in Sewell?
The windiest day measured in Sewell between 1940 and 2025 was 12 September 1960, with winds reaching 52.6 km/h.
What is the warmest month in Sewell?
The warmest month in Sewell is July (25.0 °C on average); the coldest is January (0.7 °C).
How much does it rain in Sewell?
Sewell receives on average 1,057 mm of precipitation per year, spread over about 114 rainy days.
Is it sunny in Sewell?
Sewell 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 Sewell?
The heaviest 24-hour snowfall measured in Sewell between 1940 and 2025 was 20 March 1958, with 39.0 cm.
Are there tropical nights in Sewell?
Yes: Sewell has on average 52 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Sewell?
In Sewell, between 1940 and 2025, the highest apparent temperature reached 45.6 °C on 15 July 1995, and the lowest was -28.7 °C on 21 January 1985.
Compare Sewell with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Sewell