Zalla climate — normals and trends
Zalla (Spain) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 12.4 °C and it receives 1,108 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 August (18.4 °C on average) and the coldest is January (6.9 °C). Rainfall peaks in November.
Zalla averages 7 frost days, 1 hot days (≥ 30 °C) and 170 rainy days per year.
Zalla has warmed by +1.9 °C between 1940 and 2025, or +0.22 °C per decade. This trend is statistically significant.
The number of frost days there went from about 13 to 1 per year over the period.
The hottest day of the period reached 34.4 °C (on 18 June 2022) and the coldest -11.3 °C (on 21 January 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
ZallaBasque Country
- coords
- 43.23°, -3.13°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
12.4°C
Average daily high
15.7°C
Average daily low
9.5°C
Annual rainfall
1,108mm
Sunshine / day
8.9h
Mean relative humidity
80%
Average peak wind
16.1km/h
Seasonal range
11.5°C
Frost days (< 0 °C)
7 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
170 d/yr
Annual snowfall
21.8 cm
Average feels-like high
14.5 °C
Average feels-like low
7.5 °C
Average peak gust
36.4 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
13.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °C
since 1940
+0.2 °C per decade · r² = 0.57 · 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
34.4 °C
18 June 2022
Coldest day
-11.3 °C
21 January 1940
Wettest day
66 mm
10 June 1966
Windiest day
49.0 km/h
29 December 1951
Strongest gust
127.4 km/h
29 December 1951
Hottest feels-like
38.0 °C
30 June 1968
Coldest feels-like
-15.8 °C
21 January 1940
Snowiest day
16.7 cm
13 January 1978
Sunniest day
14.9 h
27 June 1940
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 | 12.5 °C | +2.7 °C | 120 mm | +13 mm |
| Feb | 13.8 °C | +3.2 °C | 63 mm | -31 mm |
| Mar | 12.6 °C | 0.0 °C | 106 mm | +13 mm |
| Apr | 16.8 °C | +3.0 °C | 101 mm | -6 mm |
| May | 17.6 °C | +1.1 °C | 130 mm | +28 mm |
| Jun | 23.0 °C | +3.6 °C | 83 mm | +1 mm |
| Jul | 22.5 °C | +1.0 °C | 63 mm | +1 mm |
| Aug | 24.5 °C | +2.5 °C | 45 mm | -18 mm |
| Sep | 21.1 °C | +0.5 °C | 71 mm | -10 mm |
| Oct | 19.5 °C | +1.9 °C | 37 mm | -57 mm |
| Nov | 14.8 °C | +1.7 °C | 146 mm | +31 mm |
| Dec | 12.1 °C | +1.6 °C | 100 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 Zalla?
Zalla has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 12.4 °C and it receives 1,108 mm of precipitation per year.
What is the hottest day ever recorded in Zalla?
The hottest day measured in Zalla between 1940 and 2025 was 18 June 2022, reaching 34.4 °C.
What is the coldest day in Zalla?
The coldest day measured in Zalla between 1940 and 2025 was 21 January 1940, at -11.3 °C.
Does it snow in Zalla?
Yes. Zalla gets on average 21.8 cm of snow per year and has around 7 frost days.
Has the climate of Zalla warmed?
Yes: Zalla warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Zalla?
The wettest day measured in Zalla between 1940 and 2025 was 10 June 1966, with 66 mm of rain in 24 hours.
What was the windiest day in Zalla?
The windiest day measured in Zalla between 1940 and 2025 was 29 December 1951, with winds reaching 49.0 km/h.
What is the warmest month in Zalla?
The warmest month in Zalla is August (18.4 °C on average); the coldest is January (6.9 °C).
How much does it rain in Zalla?
Zalla receives on average 1,108 mm of precipitation per year, spread over about 170 rainy days.
Is it sunny in Zalla?
Zalla gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.
What is the biggest single-day snowfall in Zalla?
The heaviest 24-hour snowfall measured in Zalla between 1940 and 2025 was 13 January 1978, with 16.7 cm.
Are there tropical nights in Zalla?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Zalla.
What was the most extreme apparent temperature in Zalla?
In Zalla, between 1940 and 2025, the highest apparent temperature reached 38.0 °C on 30 June 1968, and the lowest was -15.8 °C on 21 January 1940.
Compare Zalla with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Zalla