Kostroma climate — normals and trends
Kostroma (Russia) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 3.8 °C and it receives 657 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 (18.3 °C on average) and the coldest is January (-10.8 °C). Rainfall peaks in July.
Kostroma averages 168 frost days, 3 hot days (≥ 30 °C) and 136 rainy days per year.
Kostroma has warmed by +2.8 °C between 1940 and 2025, or +0.33 °C per decade. This trend is statistically significant.
The number of frost days there went from about 180 to 156 per year over the period.
The hottest day of the period reached 35.4 °C (on 29 July 2010) and the coldest -44.5 °C (on 31 December 1978).
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
KostromaKostroma Oblast
- coords
- 57.77°, 40.93°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
3.8°C
Average daily high
7.3°C
Average daily low
0.1°C
Annual rainfall
657mm
Sunshine / day
6.7h
Mean relative humidity
79%
Average peak wind
18.0km/h
Seasonal range
29.1°C
Frost days (< 0 °C)
168 d/yr
Hot days (≥ 30 °C)
3 d/yr
Rainy days (≥ 1 mm)
136 d/yr
Annual snowfall
144.1 cm
Average feels-like high
4.1 °C
Average feels-like low
-3.5 °C
Average peak gust
34.6 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
9.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.8 °C
since 1940
+0.3 °C per decade · r² = 0.44 · 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
35.4 °C
29 July 2010
Coldest day
-44.5 °C
31 December 1978
Wettest day
52 mm
19 June 1945
Windiest day
45.3 km/h
24 October 1989
Strongest gust
92.9 km/h
13 November 1983
Hottest feels-like
39.5 °C
8 August 2010
Coldest feels-like
-49.9 °C
31 December 1978
Snowiest day
16.5 cm
14 October 1973
Sunniest day
17.1 h
26 June 2010
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 | -0.4 °C | +7.8 °C | 50 mm | +11 mm |
| Feb | -3.4 °C | +3.3 °C | 10 mm | -23 mm |
| Mar | 6.0 °C | +6.5 °C | 44 mm | +8 mm |
| Apr | 10.7 °C | +2.3 °C | 44 mm | +2 mm |
| May | 17.0 °C | +0.8 °C | 99 mm | +38 mm |
| Jun | 19.9 °C | -0.6 °C | 67 mm | -6 mm |
| Jul | 25.5 °C | +2.8 °C | 56 mm | -21 mm |
| Aug | 20.6 °C | -0.1 °C | 93 mm | +23 mm |
| Sep | 17.4 °C | +3.0 °C | 18 mm | -48 mm |
| Oct | 8.1 °C | +1.6 °C | 58 mm | -6 mm |
| Nov | 3.8 °C | +4.6 °C | 62 mm | +11 mm |
| Dec | -1.0 °C | +4.4 °C | 53 mm | +8 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 Kostroma?
Kostroma has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 3.8 °C and it receives 657 mm of precipitation per year.
What is the hottest day ever recorded in Kostroma?
The hottest day measured in Kostroma between 1940 and 2025 was 29 July 2010, reaching 35.4 °C.
What is the coldest day in Kostroma?
The coldest day measured in Kostroma between 1940 and 2025 was 31 December 1978, at -44.5 °C.
Does it snow in Kostroma?
Yes. Kostroma gets on average 144.1 cm of snow per year and has around 168 frost days.
Has the climate of Kostroma warmed?
Yes: Kostroma warmed by +2.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Kostroma?
The wettest day measured in Kostroma between 1940 and 2025 was 19 June 1945, with 52 mm of rain in 24 hours.
What was the windiest day in Kostroma?
The windiest day measured in Kostroma between 1940 and 2025 was 24 October 1989, with winds reaching 45.3 km/h.
What is the warmest month in Kostroma?
The warmest month in Kostroma is July (18.3 °C on average); the coldest is January (-10.8 °C).
How much does it rain in Kostroma?
Kostroma receives on average 657 mm of precipitation per year, spread over about 136 rainy days.
Is it sunny in Kostroma?
Kostroma gets on average 6.7 hours of sunshine per day, roughly 2,446 hours per year over 1940-2025.
What is the biggest single-day snowfall in Kostroma?
The heaviest 24-hour snowfall measured in Kostroma between 1940 and 2025 was 14 October 1973, with 16.5 cm.
Are there tropical nights in Kostroma?
Yes: Kostroma has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Kostroma?
In Kostroma, between 1940 and 2025, the highest apparent temperature reached 39.5 °C on 8 August 2010, and the lowest was -49.9 °C on 31 December 1978.
Compare Kostroma with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Kostroma