Jam climate — normals and trends
Jam (Iran) has a hot desert climate (BWh) under the Köppen-Geiger classification. Its mean annual temperature is 25.1 °C and it receives 237 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 (32.7 °C on average) and the coldest is January (15.8 °C). Rainfall peaks in December.
Jam averages 0 frost days, 163 hot days (≥ 30 °C) and 22 rainy days per year.
Jam has warmed by +1.4 °C between 1940 and 2025, or +0.16 °C per decade. This trend is statistically significant.
The hottest day of the period reached 41.4 °C (on 1 August 1988) and the coldest 1.5 °C (on 20 January 1964).
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
JamBushehr
- coords
- 27.83°, 52.33°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
25.1°C
Average daily high
27.3°C
Average daily low
22.9°C
Annual rainfall
237mm
Sunshine / day
11.2h
Mean relative humidity
58%
Average peak wind
16.8km/h
Seasonal range
16.9°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
163 d/yr
Rainy days (≥ 1 mm)
22 d/yr
Annual snowfall
0.0 cm
Average feels-like high
29.0 °C
Average feels-like low
23.6 °C
Average peak gust
27.1 km/h
Tropical nights (≥ 20 °C)
231 d/yr
Solar radiation
21.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.4 °C
since 1940
+0.2 °C per decade · r² = 0.35 · 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
41.4 °C
1 August 1988
Coldest day
1.5 °C
20 January 1964
Wettest day
139 mm
14 December 1953
Windiest day
43.8 km/h
7 March 1954
Strongest gust
65.5 km/h
16 December 1964
Hottest feels-like
46.1 °C
11 August 2022
Coldest feels-like
-5.7 °C
20 January 1964
Snowiest day
0.2 cm
10 January 1949
Sunniest day
13.0 h
26 April 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 | 19.8 °C | +1.8 °C | 7 mm | -65 mm |
| Feb | 19.6 °C | +0.5 °C | 34 mm | -1 mm |
| Mar | 22.6 °C | +0.5 °C | 13 mm | -9 mm |
| Apr | 29.5 °C | +3.3 °C | 0 mm | -8 mm |
| May | 32.9 °C | +1.8 °C | 0 mm | -2 mm |
| Jun | 34.4 °C | +0.7 °C | 0 mm | 0 mm |
| Jul | 34.7 °C | +0.3 °C | 0 mm | -0 mm |
| Aug | 34.9 °C | +0.3 °C | 0 mm | -1 mm |
| Sep | 34.0 °C | +0.8 °C | 0 mm | -0 mm |
| Oct | 30.3 °C | +0.1 °C | 0 mm | -1 mm |
| Nov | 27.1 °C | +1.9 °C | 0 mm | -22 mm |
| Dec | 21.4 °C | +1.0 °C | 202 mm | +127 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 Jam?
Jam has a hot desert climate (Köppen BWh). Over 1940-2025, the average annual temperature is 25.1 °C and it receives 237 mm of precipitation per year.
What is the hottest day ever recorded in Jam?
The hottest day measured in Jam between 1940 and 2025 was 1 August 1988, reaching 41.4 °C.
What is the coldest day in Jam?
The coldest day measured in Jam between 1940 and 2025 was 20 January 1964, at 1.5 °C.
Does it snow in Jam?
Almost never: Jam sees virtually no snow, with about 0 frost days per year.
Has the climate of Jam warmed?
Yes: Jam warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Jam?
The wettest day measured in Jam between 1940 and 2025 was 14 December 1953, with 139 mm of rain in 24 hours.
What was the windiest day in Jam?
The windiest day measured in Jam between 1940 and 2025 was 7 March 1954, with winds reaching 43.8 km/h.
What is the warmest month in Jam?
The warmest month in Jam is August (32.7 °C on average); the coldest is January (15.8 °C).
How much does it rain in Jam?
Jam receives on average 237 mm of precipitation per year, spread over about 22 rainy days.
Is it sunny in Jam?
Jam gets on average 11.2 hours of sunshine per day, roughly 4,088 hours per year over 1940-2025.
What is the biggest single-day snowfall in Jam?
The heaviest 24-hour snowfall measured in Jam between 1940 and 2025 was 10 January 1949, with 0.2 cm.
Are there tropical nights in Jam?
Yes: Jam has on average 231 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Jam?
In Jam, between 1940 and 2025, the highest apparent temperature reached 46.1 °C on 11 August 2022, and the lowest was -5.7 °C on 20 January 1964.
Compare Jam with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Jam