Sztum climate — normals and trends
Sztum (Poland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.0 °C and it receives 620 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 (17.9 °C on average) and the coldest is January (-2.1 °C). Rainfall peaks in July.
Sztum averages 97 frost days, 2 hot days (≥ 30 °C) and 130 rainy days per year.
Sztum has warmed by +2.4 °C between 1940 and 2025, or +0.28 °C per decade. This trend is statistically significant.
The number of frost days there went from about 118 to 76 per year over the period.
The hottest day of the period reached 35.5 °C (on 10 August 1992) and the coldest -30.5 °C (on 1 February 1956).
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
SztumPomerania
- coords
- 53.92°, 19.03°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.0°C
Average daily high
11.4°C
Average daily low
4.5°C
Annual rainfall
620mm
Sunshine / day
7.6h
Mean relative humidity
80%
Average peak wind
19.6km/h
Seasonal range
20.0°C
Frost days (< 0 °C)
97 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
130 d/yr
Annual snowfall
53.0 cm
Average feels-like high
8.6 °C
Average feels-like low
1.3 °C
Average peak gust
36.9 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
+2.4 °C
since 1940
+0.3 °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
35.5 °C
10 August 1992
Coldest day
-30.5 °C
1 February 1956
Wettest day
70 mm
28 July 2025
Windiest day
56.8 km/h
2 November 1981
Strongest gust
106.9 km/h
18 November 2004
Hottest feels-like
36.6 °C
30 July 1994
Coldest feels-like
-35.6 °C
1 February 1956
Snowiest day
18.1 cm
4 April 1970
Sunniest day
16.2 h
18 June 2021
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 4.4 °C | +4.4 °C | 70 mm | +33 mm |
| Feb | 2.7 °C | +1.6 °C | 17 mm | -17 mm |
| Mar | 10.8 °C | +5.4 °C | 19 mm | -16 mm |
| Apr | 14.6 °C | +3.1 °C | 30 mm | -13 mm |
| May | 14.8 °C | -1.9 °C | 66 mm | +6 mm |
| Jun | 20.7 °C | +0.6 °C | 62 mm | -10 mm |
| Jul | 22.5 °C | +0.5 °C | 213 mm | +123 mm |
| Aug | 21.8 °C | -0.2 °C | 64 mm | -7 mm |
| Sep | 19.7 °C | +1.9 °C | 63 mm | +11 mm |
| Oct | 12.1 °C | 0.0 °C | 69 mm | +25 mm |
| Nov | 5.9 °C | +0.1 °C | 46 mm | +3 mm |
| Dec | 4.4 °C | +2.4 °C | 23 mm | -19 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 Sztum?
Sztum has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.0 °C and it receives 620 mm of precipitation per year.
What is the hottest day ever recorded in Sztum?
The hottest day measured in Sztum between 1940 and 2025 was 10 August 1992, reaching 35.5 °C.
What is the coldest day in Sztum?
The coldest day measured in Sztum between 1940 and 2025 was 1 February 1956, at -30.5 °C.
Does it snow in Sztum?
Yes. Sztum gets on average 53.0 cm of snow per year and has around 97 frost days.
Has the climate of Sztum warmed?
Yes: Sztum warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sztum?
The wettest day measured in Sztum between 1940 and 2025 was 28 July 2025, with 70 mm of rain in 24 hours.
What was the windiest day in Sztum?
The windiest day measured in Sztum between 1940 and 2025 was 2 November 1981, with winds reaching 56.8 km/h.
What is the warmest month in Sztum?
The warmest month in Sztum is July (17.9 °C on average); the coldest is January (-2.1 °C).
How much does it rain in Sztum?
Sztum receives on average 620 mm of precipitation per year, spread over about 130 rainy days.
Is it sunny in Sztum?
Sztum gets on average 7.6 hours of sunshine per day, roughly 2,774 hours per year over 1940-2025.
What is the biggest single-day snowfall in Sztum?
The heaviest 24-hour snowfall measured in Sztum between 1940 and 2025 was 4 April 1970, with 18.1 cm.
Are there tropical nights in Sztum?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Sztum.
What was the most extreme apparent temperature in Sztum?
In Sztum, between 1940 and 2025, the highest apparent temperature reached 36.6 °C on 30 July 1994, and the lowest was -35.6 °C on 1 February 1956.
Compare Sztum with another city
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Nearby cities
The climate around Sztum