Bol climate — normals and trends
Bol (Chad) has a hot desert climate (BWh) under the Köppen-Geiger classification. Its mean annual temperature is 28.4 °C and it receives 261 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 (33.5 °C on average) and the coldest is January (22.1 °C). Rainfall peaks in August.
Bol averages 0 frost days, 319 hot days (≥ 30 °C) and 41 rainy days per year.
Bol has warmed by +2.2 °C between 1940 and 2025, or +0.26 °C per decade. This trend is statistically significant.
The hottest day of the period reached 46.0 °C (on 22 May 2024) and the coldest 7.1 °C (on 12 January 1978).
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
BolLac Region
- coords
- 13.47°, 14.71°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
28.4°C
Average daily high
35.4°C
Average daily low
22.3°C
Annual rainfall
261mm
Sunshine / day
11.2h
Mean relative humidity
36%
Average peak wind
20.2km/h
Seasonal range
11.4°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
319 d/yr
Rainy days (≥ 1 mm)
41 d/yr
Annual snowfall
0.0 cm
Average feels-like high
34.9 °C
Average feels-like low
21.1 °C
Average peak gust
37.0 km/h
Tropical nights (≥ 20 °C)
255 d/yr
Solar radiation
23.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.2 °C
since 1940
+0.3 °C per decade · r² = 0.65 · 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
46.0 °C
22 May 2024
Coldest day
7.1 °C
12 January 1978
Wettest day
157 mm
8 August 2010
Windiest day
43.0 km/h
19 May 2005
Strongest gust
70.9 km/h
19 May 2005
Hottest feels-like
46.8 °C
22 May 1998
Coldest feels-like
2.6 °C
12 January 1978
Sunniest day
12.1 h
13 July 1941
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 | 32.3 °C | +1.9 °C | 0 mm | 0 mm |
| Feb | 34.6 °C | +1.4 °C | 0 mm | 0 mm |
| Mar | 39.5 °C | +2.2 °C | 0 mm | 0 mm |
| Apr | 41.5 °C | +1.1 °C | 0 mm | -1 mm |
| May | 42.1 °C | +1.6 °C | 0 mm | -7 mm |
| Jun | 39.7 °C | +1.0 °C | 2 mm | -13 mm |
| Jul | 34.8 °C | +0.1 °C | 29 mm | -44 mm |
| Aug | 32.4 °C | +0.2 °C | 80 mm | -45 mm |
| Sep | 35.2 °C | +0.1 °C | 34 mm | -2 mm |
| Oct | 38.5 °C | +1.3 °C | 0 mm | -5 mm |
| Nov | 36.9 °C | +2.4 °C | 0 mm | -0 mm |
| Dec | 34.9 °C | +3.8 °C | 0 mm | 0 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 Bol?
Bol has a hot desert climate (Köppen BWh). Over 1940-2025, the average annual temperature is 28.4 °C and it receives 261 mm of precipitation per year.
What is the hottest day ever recorded in Bol?
The hottest day measured in Bol between 1940 and 2025 was 22 May 2024, reaching 46.0 °C.
What is the coldest day in Bol?
The coldest day measured in Bol between 1940 and 2025 was 12 January 1978, at 7.1 °C.
Does it snow in Bol?
Almost never: Bol sees virtually no snow, with about 0 frost days per year.
Has the climate of Bol warmed?
Yes: Bol warmed by +2.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Bol?
The wettest day measured in Bol between 1940 and 2025 was 8 August 2010, with 157 mm of rain in 24 hours.
What was the windiest day in Bol?
The windiest day measured in Bol between 1940 and 2025 was 19 May 2005, with winds reaching 43.0 km/h.
What is the warmest month in Bol?
The warmest month in Bol is May (33.5 °C on average); the coldest is January (22.1 °C).
How much does it rain in Bol?
Bol receives on average 261 mm of precipitation per year, spread over about 41 rainy days.
Is it sunny in Bol?
Bol gets on average 11.2 hours of sunshine per day, roughly 4,088 hours per year over 1940-2025.
Are there tropical nights in Bol?
Yes: Bol has on average 255 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Bol?
In Bol, between 1940 and 2025, the highest apparent temperature reached 46.8 °C on 22 May 1998, and the lowest was 2.6 °C on 12 January 1978.
Compare Bol with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Bol