La Unión climate — normals and trends
La Unión (Spain) has a cold semi-arid climate (BSk) under the Köppen-Geiger classification. Its mean annual temperature is 18.0 °C and it receives 281 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 (24.7 °C on average) and the coldest is January (12.8 °C). Rainfall peaks in October.
La Unión averages 0 frost days, 0 hot days (≥ 30 °C) and 42 rainy days per year.
La Unión has warmed by +1.3 °C between 1940 and 2025, or +0.16 °C per decade. This trend is statistically significant.
The hottest day of the period reached 33.0 °C (on 18 August 2025) and the coldest 1.7 °C (on 11 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
La UniónMurcia
- coords
- 37.62°, -0.88°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
18.0°C
Average daily high
19.0°C
Average daily low
17.0°C
Annual rainfall
281mm
Sunshine / day
10.9h
Mean relative humidity
78%
Average peak wind
25.8km/h
Seasonal range
11.9°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
42 d/yr
Annual snowfall
0.0 cm
Average feels-like high
19.0 °C
Average feels-like low
15.5 °C
Average peak gust
34.9 km/h
Tropical nights (≥ 20 °C)
117 d/yr
Solar radiation
18.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.3 °C
since 1940
+0.2 °C per decade · r² = 0.50 · 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
33.0 °C
18 August 2025
Coldest day
1.7 °C
11 February 1956
Wettest day
132 mm
7 September 1989
Windiest day
77.2 km/h
22 December 1958
Strongest gust
119.2 km/h
13 December 1949
Hottest feels-like
36.1 °C
21 July 2023
Coldest feels-like
-7.5 °C
1 February 1954
Snowiest day
0.4 cm
11 January 1960
Sunniest day
14.0 h
12 May 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 | 15.7 °C | +1.7 °C | 10 mm | -22 mm |
| Feb | 15.1 °C | +1.1 °C | 11 mm | -11 mm |
| Mar | 15.9 °C | +1.0 °C | 89 mm | +63 mm |
| Apr | 17.6 °C | +1.2 °C | 2 mm | -24 mm |
| May | 20.4 °C | +1.7 °C | 38 mm | +20 mm |
| Jun | 24.9 °C | +3.1 °C | 2 mm | -4 mm |
| Jul | 26.9 °C | +2.4 °C | 5 mm | +3 mm |
| Aug | 27.4 °C | +1.9 °C | 0 mm | -6 mm |
| Sep | 25.3 °C | +1.3 °C | 16 mm | -10 mm |
| Oct | 22.5 °C | +1.5 °C | 50 mm | +9 mm |
| Nov | 18.9 °C | +1.2 °C | 6 mm | -32 mm |
| Dec | 15.8 °C | +0.7 °C | 75 mm | +38 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 La Unión?
La Unión has a cold semi-arid climate (Köppen BSk). Over 1940-2025, the average annual temperature is 18.0 °C and it receives 281 mm of precipitation per year.
What is the hottest day ever recorded in La Unión?
The hottest day measured in La Unión between 1940 and 2025 was 18 August 2025, reaching 33.0 °C.
What is the coldest day in La Unión?
The coldest day measured in La Unión between 1940 and 2025 was 11 February 1956, at 1.7 °C.
Does it snow in La Unión?
Almost never: La Unión sees virtually no snow, with about 0 frost days per year.
Has the climate of La Unión warmed?
Yes: La Unión warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in La Unión?
The wettest day measured in La Unión between 1940 and 2025 was 7 September 1989, with 132 mm of rain in 24 hours.
What was the windiest day in La Unión?
The windiest day measured in La Unión between 1940 and 2025 was 22 December 1958, with winds reaching 77.2 km/h.
What is the warmest month in La Unión?
The warmest month in La Unión is August (24.7 °C on average); the coldest is January (12.8 °C).
How much does it rain in La Unión?
La Unión receives on average 281 mm of precipitation per year, spread over about 42 rainy days.
Is it sunny in La Unión?
La Unión gets on average 10.9 hours of sunshine per day, roughly 3,979 hours per year over 1940-2025.
What is the biggest single-day snowfall in La Unión?
The heaviest 24-hour snowfall measured in La Unión between 1940 and 2025 was 11 January 1960, with 0.4 cm.
Are there tropical nights in La Unión?
Yes: La Unión has on average 117 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in La Unión?
In La Unión, between 1940 and 2025, the highest apparent temperature reached 36.1 °C on 21 July 2023, and the lowest was -7.5 °C on 1 February 1954.
Compare La Unión with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around La Unión