Loreto climate — normals and trends
Loreto (Mexico) has a cold semi-arid climate (BSk) under the Köppen-Geiger classification. Its mean annual temperature is 17.2 °C and it receives 389 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 May (21.1 °C on average) and the coldest is January (12.3 °C). Rainfall peaks in July.
Loreto averages 2 frost days, 21 hot days (≥ 30 °C) and 59 rainy days per year.
Loreto has warmed by +1.9 °C between 1940 and 2025, or +0.22 °C per decade. This trend is statistically significant.
The hottest day of the period reached 35.3 °C (on 8 May 1998) and the coldest -5.7 °C (on 24 January 1955).
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
LoretoZacatecas
- coords
- 22.27°, -101.99°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
17.2°C
Average daily high
24.4°C
Average daily low
10.7°C
Annual rainfall
389mm
Sunshine / day
11.1h
Mean relative humidity
51%
Average peak wind
18.6km/h
Seasonal range
8.8°C
Frost days (< 0 °C)
2 d/yr
Hot days (≥ 30 °C)
21 d/yr
Rainy days (≥ 1 mm)
59 d/yr
Annual snowfall
0.2 cm
Average feels-like high
22.4 °C
Average feels-like low
8.8 °C
Average peak gust
36.6 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
22.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °C
since 1940
+0.2 °C per decade · r² = 0.63 · 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
35.3 °C
8 May 1998
Coldest day
-5.7 °C
24 January 1955
Wettest day
60 mm
1 July 2010
Windiest day
50.8 km/h
7 January 1946
Strongest gust
96.1 km/h
8 January 2013
Hottest feels-like
36.3 °C
9 June 1989
Coldest feels-like
-12.2 °C
13 December 1997
Snowiest day
6.4 cm
10 January 1967
Sunniest day
13.3 h
26 June 1957
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 | 21.9 °C | +2.0 °C | 10 mm | -3 mm |
| Feb | 25.8 °C | +3.8 °C | 0 mm | -8 mm |
| Mar | 27.8 °C | +3.0 °C | 0 mm | -5 mm |
| Apr | 29.0 °C | +1.8 °C | 0 mm | -8 mm |
| May | 30.5 °C | +1.9 °C | 31 mm | +10 mm |
| Jun | 26.6 °C | -0.8 °C | 61 mm | -3 mm |
| Jul | 24.9 °C | -0.9 °C | 140 mm | +58 mm |
| Aug | 26.9 °C | +1.1 °C | 148 mm | +72 mm |
| Sep | 26.3 °C | +1.7 °C | 78 mm | +11 mm |
| Oct | 26.6 °C | +2.6 °C | 13 mm | -14 mm |
| Nov | 25.6 °C | +3.0 °C | 0 mm | -8 mm |
| Dec | 22.8 °C | +2.4 °C | 4 mm | -5 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 Loreto?
Loreto has a cold semi-arid climate (Köppen BSk). Over 1940-2025, the average annual temperature is 17.2 °C and it receives 389 mm of precipitation per year.
What is the hottest day ever recorded in Loreto?
The hottest day measured in Loreto between 1940 and 2025 was 8 May 1998, reaching 35.3 °C.
What is the coldest day in Loreto?
The coldest day measured in Loreto between 1940 and 2025 was 24 January 1955, at -5.7 °C.
Does it snow in Loreto?
Almost never: Loreto sees virtually no snow, with about 2 frost days per year.
Has the climate of Loreto warmed?
Yes: Loreto warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Loreto?
The wettest day measured in Loreto between 1940 and 2025 was 1 July 2010, with 60 mm of rain in 24 hours.
What was the windiest day in Loreto?
The windiest day measured in Loreto between 1940 and 2025 was 7 January 1946, with winds reaching 50.8 km/h.
What is the warmest month in Loreto?
The warmest month in Loreto is May (21.1 °C on average); the coldest is January (12.3 °C).
How much does it rain in Loreto?
Loreto receives on average 389 mm of precipitation per year, spread over about 59 rainy days.
Is it sunny in Loreto?
Loreto gets on average 11.1 hours of sunshine per day, roughly 4,052 hours per year over 1940-2025.
What is the biggest single-day snowfall in Loreto?
The heaviest 24-hour snowfall measured in Loreto between 1940 and 2025 was 10 January 1967, with 6.4 cm.
Are there tropical nights in Loreto?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Loreto.
What was the most extreme apparent temperature in Loreto?
In Loreto, between 1940 and 2025, the highest apparent temperature reached 36.3 °C on 9 June 1989, and the lowest was -12.2 °C on 13 December 1997.
Compare Loreto with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Loreto