Delfzijl climate — normals and trends
Delfzijl (The Netherlands) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.4 °C and it receives 787 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 (17.0 °C on average) and the coldest is January (1.8 °C). Rainfall peaks in July.
Delfzijl averages 53 frost days, 2 hot days (≥ 30 °C) and 153 rainy days per year.
Delfzijl 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 68 to 38 per year over the period.
The hottest day of the period reached 36.0 °C (on 25 July 2019) and the coldest -22.4 °C (on 13 February 1940).
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
DelfzijlGroningen
- coords
- 53.33°, 6.92°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.4°C
Average daily high
12.5°C
Average daily low
6.4°C
Annual rainfall
787mm
Sunshine / day
7.8h
Mean relative humidity
82%
Average peak wind
21.3km/h
Seasonal range
15.2°C
Frost days (< 0 °C)
53 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
153 d/yr
Annual snowfall
22.9 cm
Average feels-like high
9.8 °C
Average feels-like low
3.2 °C
Average peak gust
39.5 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
10.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.41 · 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
36.0 °C
25 July 2019
Coldest day
-22.4 °C
13 February 1940
Wettest day
53 mm
29 June 1981
Windiest day
64.8 km/h
28 October 2013
Strongest gust
127.4 km/h
23 February 1967
Hottest feels-like
39.5 °C
25 July 2019
Coldest feels-like
-27.5 °C
13 February 1940
Snowiest day
14.9 cm
25 February 1958
Sunniest day
16.3 h
21 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 | 5.3 °C | +1.6 °C | 61 mm | +2 mm |
| Feb | 5.4 °C | +0.8 °C | 29 mm | -19 mm |
| Mar | 11.8 °C | +3.8 °C | 11 mm | -44 mm |
| Apr | 14.9 °C | +2.8 °C | 45 mm | -11 mm |
| May | 17.3 °C | +1.1 °C | 41 mm | -25 mm |
| Jun | 21.2 °C | +2.2 °C | 112 mm | +34 mm |
| Jul | 22.1 °C | +1.4 °C | 96 mm | +5 mm |
| Aug | 22.6 °C | +1.8 °C | 53 mm | -31 mm |
| Sep | 19.0 °C | +1.1 °C | 85 mm | +19 mm |
| Oct | 14.0 °C | +0.6 °C | 99 mm | +38 mm |
| Nov | 9.3 °C | +1.1 °C | 79 mm | +17 mm |
| Dec | 7.6 °C | +2.5 °C | 31 mm | -30 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 Delfzijl?
Delfzijl has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 9.4 °C and it receives 787 mm of precipitation per year.
What is the hottest day ever recorded in Delfzijl?
The hottest day measured in Delfzijl between 1940 and 2025 was 25 July 2019, reaching 36.0 °C.
What is the coldest day in Delfzijl?
The coldest day measured in Delfzijl between 1940 and 2025 was 13 February 1940, at -22.4 °C.
Does it snow in Delfzijl?
Yes. Delfzijl gets on average 22.9 cm of snow per year and has around 53 frost days.
Has the climate of Delfzijl warmed?
Yes: Delfzijl warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Delfzijl?
The wettest day measured in Delfzijl between 1940 and 2025 was 29 June 1981, with 53 mm of rain in 24 hours.
What was the windiest day in Delfzijl?
The windiest day measured in Delfzijl between 1940 and 2025 was 28 October 2013, with winds reaching 64.8 km/h.
What is the warmest month in Delfzijl?
The warmest month in Delfzijl is July (17.0 °C on average); the coldest is January (1.8 °C).
How much does it rain in Delfzijl?
Delfzijl receives on average 787 mm of precipitation per year, spread over about 153 rainy days.
Is it sunny in Delfzijl?
Delfzijl gets on average 7.8 hours of sunshine per day, roughly 2,847 hours per year over 1940-2025.
What is the biggest single-day snowfall in Delfzijl?
The heaviest 24-hour snowfall measured in Delfzijl between 1940 and 2025 was 25 February 1958, with 14.9 cm.
Are there tropical nights in Delfzijl?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Delfzijl.
What was the most extreme apparent temperature in Delfzijl?
In Delfzijl, between 1940 and 2025, the highest apparent temperature reached 39.5 °C on 25 July 2019, and the lowest was -27.5 °C on 13 February 1940.
Compare Delfzijl with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Delfzijl