Deder climate — normals and trends
Deder (Ethiopia) has a subtropical highland, dry winter climate (Cwb) under the Köppen-Geiger classification. Its mean annual temperature is 17.8 °C and it receives 1,255 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 March (19.2 °C on average) and the coldest is December (16.4 °C). Rainfall peaks in May.
Deder averages 0 frost days, 0 hot days (≥ 30 °C) and 170 rainy days per year.
Deder 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 30.5 °C (on 22 March 2009) and the coldest 5.0 °C (on 4 January 1986).
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
DederOromiya
- coords
- 9.31°, 41.44°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
17.8°C
Average daily high
23.0°C
Average daily low
13.5°C
Annual rainfall
1,255mm
Sunshine / day
10.9h
Mean relative humidity
65%
Average peak wind
9.0km/h
Seasonal range
2.8°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
170 d/yr
Annual snowfall
0.0 cm
Average feels-like high
24.0 °C
Average feels-like low
12.8 °C
Average peak gust
29.7 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
20.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.2 °C
since 1940
+0.3 °C per decade · r² = 0.79 · 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
30.5 °C
22 March 2009
Coldest day
5.0 °C
4 January 1986
Wettest day
238 mm
14 May 2016
Windiest day
23.2 km/h
20 November 1994
Strongest gust
78.1 km/h
11 May 2004
Hottest feels-like
33.5 °C
14 May 2016
Coldest feels-like
0.5 °C
17 January 1960
Sunniest day
12.0 h
29 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 | 24.7 °C | +1.8 °C | 0 mm | -19 mm |
| Feb | 26.8 °C | +2.7 °C | 1 mm | -34 mm |
| Mar | 25.9 °C | +1.5 °C | 87 mm | -13 mm |
| Apr | 26.0 °C | +2.4 °C | 131 mm | -58 mm |
| May | 26.1 °C | +2.2 °C | 122 mm | -93 mm |
| Jun | 26.1 °C | +2.6 °C | 37 mm | -55 mm |
| Jul | 24.1 °C | +2.0 °C | 86 mm | -58 mm |
| Aug | 21.9 °C | +0.1 °C | 145 mm | -11 mm |
| Sep | 22.7 °C | +0.5 °C | 111 mm | -23 mm |
| Oct | 23.5 °C | +0.8 °C | 104 mm | -2 mm |
| Nov | 23.5 °C | +1.3 °C | 1 mm | -43 mm |
| Dec | 23.8 °C | +1.7 °C | 8 mm | -10 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 Deder?
Deder has a subtropical highland, dry winter climate (Köppen Cwb). Over 1940-2025, the average annual temperature is 17.8 °C and it receives 1,255 mm of precipitation per year.
What is the hottest day ever recorded in Deder?
The hottest day measured in Deder between 1940 and 2025 was 22 March 2009, reaching 30.5 °C.
What is the coldest day in Deder?
The coldest day measured in Deder between 1940 and 2025 was 4 January 1986, at 5.0 °C.
Does it snow in Deder?
Almost never: Deder sees virtually no snow, with about 0 frost days per year.
Has the climate of Deder warmed?
Yes: Deder warmed by +2.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Deder?
The wettest day measured in Deder between 1940 and 2025 was 14 May 2016, with 238 mm of rain in 24 hours.
What was the windiest day in Deder?
The windiest day measured in Deder between 1940 and 2025 was 20 November 1994, with winds reaching 23.2 km/h.
What is the warmest month in Deder?
The warmest month in Deder is March (19.2 °C on average); the coldest is December (16.4 °C).
How much does it rain in Deder?
Deder receives on average 1,255 mm of precipitation per year, spread over about 170 rainy days.
Is it sunny in Deder?
Deder gets on average 10.9 hours of sunshine per day, roughly 3,979 hours per year over 1940-2025.
Are there tropical nights in Deder?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Deder.
What was the most extreme apparent temperature in Deder?
In Deder, between 1940 and 2025, the highest apparent temperature reached 33.5 °C on 14 May 2016, and the lowest was 0.5 °C on 17 January 1960.
Compare Deder with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Deder