Ciechanów climate — normals and trends
Ciechanów (Poland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 7.6 °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 (18.0 °C on average) and the coldest is January (-3.1 °C). Rainfall peaks in July.
Ciechanów averages 109 frost days, 3 hot days (≥ 30 °C) and 129 rainy days per year.
Ciechanów 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 128 to 90 per year over the period.
The hottest day of the period reached 35.1 °C (on 8 August 2015) and the coldest -30.4 °C (on 30 January 1987).
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
CiechanówMazovia
- coords
- 52.88°, 20.62°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
7.6°C
Average daily high
11.2°C
Average daily low
4.0°C
Annual rainfall
620mm
Sunshine / day
7.2h
Mean relative humidity
80%
Average peak wind
19.3km/h
Seasonal range
21.1°C
Frost days (< 0 °C)
109 d/yr
Hot days (≥ 30 °C)
3 d/yr
Rainy days (≥ 1 mm)
129 d/yr
Annual snowfall
65.3 cm
Average feels-like high
8.3 °C
Average feels-like low
0.7 °C
Average peak gust
36.4 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
10.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.4 °C
since 1940
+0.3 °C per decade · r² = 0.42 · 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
35.1 °C
8 August 2015
Coldest day
-30.4 °C
30 January 1987
Wettest day
77 mm
3 September 1995
Windiest day
55.6 km/h
3 November 1981
Strongest gust
106.2 km/h
23 February 2008
Hottest feels-like
36.4 °C
11 July 1959
Coldest feels-like
-36.1 °C
30 January 1987
Snowiest day
18.8 cm
30 January 1979
Sunniest day
16.2 h
17 June 2021
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 | 3.8 °C | +4.8 °C | 45 mm | +5 mm |
| Feb | 2.0 °C | +1.7 °C | 10 mm | -27 mm |
| Mar | 11.2 °C | +6.2 °C | 29 mm | -9 mm |
| Apr | 16.0 °C | +4.2 °C | 20 mm | -24 mm |
| May | 15.2 °C | -2.1 °C | 74 mm | +10 mm |
| Jun | 21.8 °C | +1.1 °C | 62 mm | -6 mm |
| Jul | 23.2 °C | +0.7 °C | 119 mm | +37 mm |
| Aug | 23.0 °C | +0.8 °C | 52 mm | -11 mm |
| Sep | 19.7 °C | +2.1 °C | 74 mm | +24 mm |
| Oct | 11.5 °C | -0.1 °C | 59 mm | +16 mm |
| Nov | 5.5 °C | +0.5 °C | 51 mm | +7 mm |
| Dec | 3.8 °C | +2.7 °C | 20 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 Ciechanów?
Ciechanów has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 7.6 °C and it receives 620 mm of precipitation per year.
What is the hottest day ever recorded in Ciechanów?
The hottest day measured in Ciechanów between 1940 and 2025 was 8 August 2015, reaching 35.1 °C.
What is the coldest day in Ciechanów?
The coldest day measured in Ciechanów between 1940 and 2025 was 30 January 1987, at -30.4 °C.
Does it snow in Ciechanów?
Yes. Ciechanów gets on average 65.3 cm of snow per year and has around 109 frost days.
Has the climate of Ciechanów warmed?
Yes: Ciechanów warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ciechanów?
The wettest day measured in Ciechanów between 1940 and 2025 was 3 September 1995, with 77 mm of rain in 24 hours.
What was the windiest day in Ciechanów?
The windiest day measured in Ciechanów between 1940 and 2025 was 3 November 1981, with winds reaching 55.6 km/h.
What is the warmest month in Ciechanów?
The warmest month in Ciechanów is July (18.0 °C on average); the coldest is January (-3.1 °C).
How much does it rain in Ciechanów?
Ciechanów receives on average 620 mm of precipitation per year, spread over about 129 rainy days.
Is it sunny in Ciechanów?
Ciechanów gets on average 7.2 hours of sunshine per day, roughly 2,628 hours per year over 1940-2025.
What is the biggest single-day snowfall in Ciechanów?
The heaviest 24-hour snowfall measured in Ciechanów between 1940 and 2025 was 30 January 1979, with 18.8 cm.
Are there tropical nights in Ciechanów?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Ciechanów.
What was the most extreme apparent temperature in Ciechanów?
In Ciechanów, between 1940 and 2025, the highest apparent temperature reached 36.4 °C on 11 July 1959, and the lowest was -36.1 °C on 30 January 1987.
Compare Ciechanów with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Ciechanów