Nykarleby climate — normals and trends
Nykarleby (Finland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 4.0 °C and it receives 550 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 (16.5 °C on average) and the coldest is February (-7.3 °C). Rainfall peaks in August.
Nykarleby averages 160 frost days, 0 hot days (≥ 30 °C) and 118 rainy days per year.
Nykarleby 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 173 to 147 per year over the period.
The hottest day of the period reached 32.3 °C (on 18 July 2018) and the coldest -35.6 °C (on 15 February 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
NykarlebyOstrobothnia
- coords
- 63.52°, 22.53°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
4.0°C
Average daily high
7.0°C
Average daily low
0.7°C
Annual rainfall
550mm
Sunshine / day
7.6h
Mean relative humidity
80%
Average peak wind
18.4km/h
Seasonal range
23.8°C
Frost days (< 0 °C)
160 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
118 d/yr
Annual snowfall
106.5 cm
Average feels-like high
3.7 °C
Average feels-like low
-3.1 °C
Average peak gust
38.3 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
9.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.26 · 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
32.3 °C
18 July 2018
Coldest day
-35.6 °C
15 February 1978
Wettest day
114 mm
6 August 1967
Windiest day
51.0 km/h
26 December 1992
Strongest gust
108.7 km/h
3 March 1953
Hottest feels-like
33.5 °C
30 July 2018
Coldest feels-like
-41.2 °C
15 February 1978
Snowiest day
17.5 cm
14 December 1964
Sunniest day
19.1 h
17 June 2000
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 | -1.9 °C | +2.7 °C | 47 mm | +15 mm |
| Feb | -1.1 °C | +3.5 °C | 15 mm | -11 mm |
| Mar | 3.7 °C | +3.9 °C | 22 mm | -5 mm |
| Apr | 8.1 °C | +2.3 °C | 20 mm | -14 mm |
| May | 11.4 °C | -0.9 °C | 32 mm | -8 mm |
| Jun | 16.3 °C | -1.0 °C | 67 mm | +16 mm |
| Jul | 24.0 °C | +3.7 °C | 61 mm | -7 mm |
| Aug | 18.5 °C | -0.1 °C | 92 mm | +18 mm |
| Sep | 16.6 °C | +3.3 °C | 77 mm | +17 mm |
| Oct | 9.1 °C | +2.2 °C | 52 mm | +2 mm |
| Nov | 3.5 °C | +2.1 °C | 52 mm | +6 mm |
| Dec | 2.5 °C | +4.5 °C | 73 mm | +33 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 Nykarleby?
Nykarleby has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 4.0 °C and it receives 550 mm of precipitation per year.
What is the hottest day ever recorded in Nykarleby?
The hottest day measured in Nykarleby between 1940 and 2025 was 18 July 2018, reaching 32.3 °C.
What is the coldest day in Nykarleby?
The coldest day measured in Nykarleby between 1940 and 2025 was 15 February 1978, at -35.6 °C.
Does it snow in Nykarleby?
Yes. Nykarleby gets on average 106.5 cm of snow per year and has around 160 frost days.
Has the climate of Nykarleby warmed?
Yes: Nykarleby warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Nykarleby?
The wettest day measured in Nykarleby between 1940 and 2025 was 6 August 1967, with 114 mm of rain in 24 hours.
What was the windiest day in Nykarleby?
The windiest day measured in Nykarleby between 1940 and 2025 was 26 December 1992, with winds reaching 51.0 km/h.
What is the warmest month in Nykarleby?
The warmest month in Nykarleby is July (16.5 °C on average); the coldest is February (-7.3 °C).
How much does it rain in Nykarleby?
Nykarleby receives on average 550 mm of precipitation per year, spread over about 118 rainy days.
Is it sunny in Nykarleby?
Nykarleby 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 Nykarleby?
The heaviest 24-hour snowfall measured in Nykarleby between 1940 and 2025 was 14 December 1964, with 17.5 cm.
Are there tropical nights in Nykarleby?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Nykarleby.
What was the most extreme apparent temperature in Nykarleby?
In Nykarleby, between 1940 and 2025, the highest apparent temperature reached 33.5 °C on 30 July 2018, and the lowest was -41.2 °C on 15 February 1978.
Compare Nykarleby with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Nykarleby