San Ildefonso climate — normals and trends
San Ildefonso (Spain) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.5 °C and it receives 730 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 (20.5 °C on average) and the coldest is January (2.2 °C). Rainfall peaks in May.
San Ildefonso averages 71 frost days, 15 hot days (≥ 30 °C) and 123 rainy days per year.
San Ildefonso 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 91 to 51 per year over the period.
The hottest day of the period reached 36.9 °C (on 13 August 2021) and the coldest -17.4 °C (on 18 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
San IldefonsoCastille and León
- coords
- 40.90°, -4.01°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.5°C
Average daily high
15.4°C
Average daily low
5.8°C
Annual rainfall
730mm
Sunshine / day
10.3h
Mean relative humidity
68%
Average peak wind
12.5km/h
Seasonal range
18.3°C
Frost days (< 0 °C)
71 d/yr
Hot days (≥ 30 °C)
15 d/yr
Rainy days (≥ 1 mm)
123 d/yr
Annual snowfall
68.9 cm
Average feels-like high
13.3 °C
Average feels-like low
3.3 °C
Average peak gust
37.3 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
16.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.4 °C
since 1940
+0.3 °C per decade · r² = 0.59 · 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
36.9 °C
13 August 2021
Coldest day
-17.4 °C
18 January 1940
Wettest day
49 mm
19 October 2023
Windiest day
42.8 km/h
25 February 1989
Strongest gust
150.1 km/h
25 February 1989
Hottest feels-like
36.5 °C
24 July 1995
Coldest feels-like
-21.6 °C
18 January 1940
Snowiest day
21.4 cm
6 December 1950
Sunniest day
14.8 h
26 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 | 7.7 °C | +1.9 °C | 88 mm | +20 mm |
| Feb | 10.2 °C | +2.7 °C | 45 mm | -17 mm |
| Mar | 8.8 °C | -1.9 °C | 185 mm | +116 mm |
| Apr | 14.8 °C | +1.7 °C | 121 mm | +42 mm |
| May | 18.3 °C | +1.2 °C | 118 mm | +36 mm |
| Jun | 27.9 °C | +5.5 °C | 52 mm | -7 mm |
| Jul | 28.7 °C | +1.9 °C | 23 mm | -3 mm |
| Aug | 29.9 °C | +3.3 °C | 13 mm | -12 mm |
| Sep | 23.1 °C | +1.0 °C | 18 mm | -30 mm |
| Oct | 19.1 °C | +3.2 °C | 64 mm | -4 mm |
| Nov | 9.9 °C | +0.1 °C | 112 mm | +39 mm |
| Dec | 7.1 °C | +0.7 °C | 63 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 San Ildefonso?
San Ildefonso has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 10.5 °C and it receives 730 mm of precipitation per year.
What is the hottest day ever recorded in San Ildefonso?
The hottest day measured in San Ildefonso between 1940 and 2025 was 13 August 2021, reaching 36.9 °C.
What is the coldest day in San Ildefonso?
The coldest day measured in San Ildefonso between 1940 and 2025 was 18 January 1940, at -17.4 °C.
Does it snow in San Ildefonso?
Yes. San Ildefonso gets on average 68.9 cm of snow per year and has around 71 frost days.
Has the climate of San Ildefonso warmed?
Yes: San Ildefonso warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in San Ildefonso?
The wettest day measured in San Ildefonso between 1940 and 2025 was 19 October 2023, with 49 mm of rain in 24 hours.
What was the windiest day in San Ildefonso?
The windiest day measured in San Ildefonso between 1940 and 2025 was 25 February 1989, with winds reaching 42.8 km/h.
What is the warmest month in San Ildefonso?
The warmest month in San Ildefonso is July (20.5 °C on average); the coldest is January (2.2 °C).
How much does it rain in San Ildefonso?
San Ildefonso receives on average 730 mm of precipitation per year, spread over about 123 rainy days.
Is it sunny in San Ildefonso?
San Ildefonso gets on average 10.3 hours of sunshine per day, roughly 3,760 hours per year over 1940-2025.
What is the biggest single-day snowfall in San Ildefonso?
The heaviest 24-hour snowfall measured in San Ildefonso between 1940 and 2025 was 6 December 1950, with 21.4 cm.
Are there tropical nights in San Ildefonso?
Yes: San Ildefonso has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in San Ildefonso?
In San Ildefonso, between 1940 and 2025, the highest apparent temperature reached 36.5 °C on 24 July 1995, and the lowest was -21.6 °C on 18 January 1940.
Compare San Ildefonso with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around San Ildefonso