Denville climate — normals and trends
Denville (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 10.4 °C and it receives 1,197 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 (22.9 °C on average) and the coldest is January (-2.3 °C). Rainfall peaks in July.
Denville averages 108 frost days, 21 hot days (≥ 30 °C) and 125 rainy days per year.
Denville has warmed by +2.0 °C between 1940 and 2025, or +0.23 °C per decade. This trend is statistically significant.
The number of frost days there went from about 120 to 96 per year over the period.
The hottest day of the period reached 39.6 °C (on 18 July 2012) and the coldest -27.4 °C (on 12 January 1981).
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
DenvilleNew Jersey
- coords
- 40.89°, -74.48°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.4°C
Average daily high
15.2°C
Average daily low
5.9°C
Annual rainfall
1,197mm
Sunshine / day
8.6h
Mean relative humidity
69%
Average peak wind
16.0km/h
Seasonal range
25.2°C
Frost days (< 0 °C)
108 d/yr
Hot days (≥ 30 °C)
21 d/yr
Rainy days (≥ 1 mm)
125 d/yr
Annual snowfall
90.1 cm
Average feels-like high
13.6 °C
Average feels-like low
3.3 °C
Average peak gust
38.7 km/h
Tropical nights (≥ 20 °C)
21 d/yr
Solar radiation
14.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.47 · 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
39.6 °C
18 July 2012
Coldest day
-27.4 °C
12 January 1981
Wettest day
178 mm
16 September 1999
Windiest day
49.8 km/h
25 November 1950
Strongest gust
146.9 km/h
25 November 1950
Hottest feels-like
43.9 °C
26 August 1948
Coldest feels-like
-33.3 °C
12 January 1981
Snowiest day
33.5 cm
14 March 2017
Sunniest day
14.2 h
15 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 | 0.9 °C | -0.7 °C | 29 mm | -59 mm |
| Feb | 3.5 °C | +0.3 °C | 87 mm | +5 mm |
| Mar | 12.8 °C | +4.6 °C | 111 mm | +7 mm |
| Apr | 16.5 °C | +1.6 °C | 101 mm | -1 mm |
| May | 20.0 °C | -0.5 °C | 199 mm | +88 mm |
| Jun | 26.2 °C | +0.9 °C | 68 mm | -32 mm |
| Jul | 30.4 °C | +2.4 °C | 111 mm | -3 mm |
| Aug | 27.4 °C | +0.5 °C | 37 mm | -72 mm |
| Sep | 25.3 °C | +2.4 °C | 78 mm | -24 mm |
| Oct | 17.9 °C | +1.0 °C | 88 mm | -5 mm |
| Nov | 10.3 °C | 0.0 °C | 56 mm | -39 mm |
| Dec | 2.3 °C | -1.7 °C | 73 mm | -25 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 Denville?
Denville has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.4 °C and it receives 1,197 mm of precipitation per year.
What is the hottest day ever recorded in Denville?
The hottest day measured in Denville between 1940 and 2025 was 18 July 2012, reaching 39.6 °C.
What is the coldest day in Denville?
The coldest day measured in Denville between 1940 and 2025 was 12 January 1981, at -27.4 °C.
Does it snow in Denville?
Yes. Denville gets on average 90.1 cm of snow per year and has around 108 frost days.
Has the climate of Denville warmed?
Yes: Denville warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Denville?
The wettest day measured in Denville between 1940 and 2025 was 16 September 1999, with 178 mm of rain in 24 hours.
What was the windiest day in Denville?
The windiest day measured in Denville between 1940 and 2025 was 25 November 1950, with winds reaching 49.8 km/h.
What is the warmest month in Denville?
The warmest month in Denville is July (22.9 °C on average); the coldest is January (-2.3 °C).
How much does it rain in Denville?
Denville receives on average 1,197 mm of precipitation per year, spread over about 125 rainy days.
Is it sunny in Denville?
Denville 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 Denville?
The heaviest 24-hour snowfall measured in Denville between 1940 and 2025 was 14 March 2017, with 33.5 cm.
Are there tropical nights in Denville?
Yes: Denville has on average 21 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Denville?
In Denville, between 1940 and 2025, the highest apparent temperature reached 43.9 °C on 26 August 1948, and the lowest was -33.3 °C on 12 January 1981.
Compare Denville with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Denville