Piedras Negras climate — normals and trends
Piedras Negras (Mexico) has a hot semi-arid climate (BSh) under the Köppen-Geiger classification. Its mean annual temperature is 22.3 °C and it receives 543 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 (30.9 °C on average) and the coldest is January (11.9 °C). Rainfall peaks in May.
Piedras Negras averages 4 frost days, 174 hot days (≥ 30 °C) and 70 rainy days per year.
Piedras Negras has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.
The hottest day of the period reached 44.8 °C (on 28 June 1957) and the coldest -10.8 °C (on 15 February 2021).
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
Piedras NegrasCoahuila
- coords
- 28.70°, -100.52°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
22.3°C
Average daily high
28.3°C
Average daily low
17.0°C
Annual rainfall
543mm
Sunshine / day
9.8h
Mean relative humidity
58%
Average peak wind
20.6km/h
Seasonal range
19.0°C
Frost days (< 0 °C)
4 d/yr
Hot days (≥ 30 °C)
174 d/yr
Rainy days (≥ 1 mm)
70 d/yr
Annual snowfall
0.6 cm
Average feels-like high
28.1 °C
Average feels-like low
16.4 °C
Average peak gust
37.0 km/h
Tropical nights (≥ 20 °C)
162 d/yr
Solar radiation
18.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °C
since 1940
+0.2 °C per decade · r² = 0.28 · 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
44.8 °C
28 June 1957
Coldest day
-10.8 °C
15 February 2021
Wettest day
151 mm
25 May 2007
Windiest day
56.1 km/h
26 December 1940
Strongest gust
96.1 km/h
1 April 1983
Hottest feels-like
47.3 °C
21 June 2023
Coldest feels-like
-18.0 °C
15 February 2021
Snowiest day
11.0 cm
12 January 1985
Sunniest day
13.6 h
29 June 1942
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 | 16.1 °C | -2.1 °C | 16 mm | -10 mm |
| Feb | 23.3 °C | +2.3 °C | 3 mm | -27 mm |
| Mar | 30.0 °C | +4.6 °C | 23 mm | -12 mm |
| Apr | 32.5 °C | +2.8 °C | 32 mm | -19 mm |
| May | 35.9 °C | +3.3 °C | 66 mm | -13 mm |
| Jun | 36.4 °C | +0.9 °C | 31 mm | -23 mm |
| Jul | 35.5 °C | -1.0 °C | 112 mm | +69 mm |
| Aug | 38.2 °C | +1.7 °C | 10 mm | -38 mm |
| Sep | 34.7 °C | +1.7 °C | 22 mm | -47 mm |
| Oct | 32.2 °C | +3.5 °C | 5 mm | -52 mm |
| Nov | 26.7 °C | +3.7 °C | 19 mm | -11 mm |
| Dec | 21.9 °C | +2.7 °C | 2 mm | -20 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 Piedras Negras?
Piedras Negras has a hot semi-arid climate (Köppen BSh). Over 1940-2025, the average annual temperature is 22.3 °C and it receives 543 mm of precipitation per year.
What is the hottest day ever recorded in Piedras Negras?
The hottest day measured in Piedras Negras between 1940 and 2025 was 28 June 1957, reaching 44.8 °C.
What is the coldest day in Piedras Negras?
The coldest day measured in Piedras Negras between 1940 and 2025 was 15 February 2021, at -10.8 °C.
Does it snow in Piedras Negras?
Almost never: Piedras Negras sees virtually no snow, with about 4 frost days per year.
Has the climate of Piedras Negras warmed?
Yes: Piedras Negras warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Piedras Negras?
The wettest day measured in Piedras Negras between 1940 and 2025 was 25 May 2007, with 151 mm of rain in 24 hours.
What was the windiest day in Piedras Negras?
The windiest day measured in Piedras Negras between 1940 and 2025 was 26 December 1940, with winds reaching 56.1 km/h.
What is the warmest month in Piedras Negras?
The warmest month in Piedras Negras is August (30.9 °C on average); the coldest is January (11.9 °C).
How much does it rain in Piedras Negras?
Piedras Negras receives on average 543 mm of precipitation per year, spread over about 70 rainy days.
Is it sunny in Piedras Negras?
Piedras Negras gets on average 9.8 hours of sunshine per day, roughly 3,577 hours per year over 1940-2025.
What is the biggest single-day snowfall in Piedras Negras?
The heaviest 24-hour snowfall measured in Piedras Negras between 1940 and 2025 was 12 January 1985, with 11.0 cm.
Are there tropical nights in Piedras Negras?
Yes: Piedras Negras has on average 162 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Piedras Negras?
In Piedras Negras, between 1940 and 2025, the highest apparent temperature reached 47.3 °C on 21 June 2023, and the lowest was -18.0 °C on 15 February 2021.
Compare Piedras Negras with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Piedras Negras