Sumber climate — normals and trends
Sumber has a tropical savanna climate, averaging 25.8 °C annually with 1,907 mm of rain per year.
Climate normals · ERA5
SumberWest Java
- coords
- -6.76°, 108.48°
- period
- 1940–2025 · 86 yrs
The normals for this period
The average of every indicator across the whole window: temperature, water, sky, wind and notable days.
Mean daily temperature
25.8°C
Average daily high
28.7°C
Average daily low
23.8°C
Annual rainfall
1,907mm
Sunshine / day
10.2h
Mean relative humidity
80%
Average peak wind
12.7km/h
Seasonal range
1.3°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
46 d/yr
Rainy days (≥ 1 mm)
222 d/yr
Annual snowfall
0.0 cm
Average feels-like high
33.5 °C
Average feels-like low
27.2 °C
Average peak gust
28.1 km/h
Tropical nights (≥ 20 °C)
365 d/yr
Solar radiation
19.0 MJ/m²
Has the climate changed?
What the yearly averages say about warming here, and whether the slope is statistically solid.
+1.3 °C
since 1940
+0.2 °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).
Climate month by month
How an average year unfolds: when it rains, when it turns hot, when the sun is out.
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
The most extreme days ever measured here, then the year-by-year detail.
Hottest day
32.8 °C
28 October 2023
Coldest day
19.7 °C
18 June 1941
Wettest day
132 mm
7 June 1962
Windiest day
30.0 km/h
11 February 2001
Strongest gust
77.0 km/h
11 February 2001
Hottest feels-like
39.1 °C
30 March 2024
Coldest feels-like
19.5 °C
9 September 1963
Sunniest day
12.4 h
27 November 1942
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and compare it with the normal: warmer, drier, more extreme?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 28.7 °C | +0.9 °C | 393 mm | +80 mm |
| Feb | 28.7 °C | +0.9 °C | 271 mm | -26 mm |
| Mar | 28.9 °C | +0.6 °C | 289 mm | +9 mm |
| Apr | 29.1 °C | +0.5 °C | 297 mm | +117 mm |
| May | 29.2 °C | +0.4 °C | 244 mm | +134 mm |
| Jun | 29.1 °C | +0.4 °C | 81 mm | +21 mm |
| Jul | 29.0 °C | +0.3 °C | 24 mm | -10 mm |
| Aug | 28.7 °C | -0.3 °C | 94 mm | +74 mm |
| Sep | 29.5 °C | 0.0 °C | 53 mm | +21 mm |
| Oct | 30.3 °C | +0.6 °C | 213 mm | +126 mm |
| Nov | 29.3 °C | +0.1 °C | 373 mm | +177 mm |
| Dec | 29.4 °C | +1.0 °C | 312 mm | +12 mm |
The year's extremes
What was the weather like that day?
The weather actually measured on a given date, anywhere in the covered window.
Climate at a glance
What these normals say about the place, in a few sentences, and the notions needed to read them.
Sumber (Indonesia) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 25.8 °C and it receives 1,907 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 October (26.5 °C on average) and the coldest is January (25.2 °C). Rainfall peaks in January.
Sumber averages 0 frost days, 46 hot days (≥ 30 °C) and 222 rainy days per year.
Sumber has warmed by +1.3 °C between 1940 and 2025, or +0.16 °C per decade. This trend is statistically significant.
The hottest day of the period reached 32.8 °C (on 28 October 2023) and the coldest 19.7 °C (on 18 June 1941).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Compare Sumber with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Sumber
Other cities — Indonesia
Frequently asked questions
What is the climate of Sumber?
Sumber has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 25.8 °C and it receives 1,907 mm of precipitation per year.
What is the hottest day ever recorded in Sumber?
The hottest day measured in Sumber between 1940 and 2025 was 28 October 2023, reaching 32.8 °C.
What is the coldest day in Sumber?
The coldest day measured in Sumber between 1940 and 2025 was 18 June 1941, at 19.7 °C.
Does it snow in Sumber?
Almost never: Sumber sees virtually no snow, with about 0 frost days per year.
Has the climate of Sumber warmed?
Yes: Sumber warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sumber?
The wettest day measured in Sumber between 1940 and 2025 was 7 June 1962, with 132 mm of rain in 24 hours.
What was the windiest day in Sumber?
The windiest day measured in Sumber between 1940 and 2025 was 11 February 2001, with winds reaching 30.0 km/h.
What is the warmest month in Sumber?
The warmest month in Sumber is October (26.5 °C on average); the coldest is January (25.2 °C).
How much does it rain in Sumber?
Sumber receives on average 1,907 mm of precipitation per year, spread over about 222 rainy days.
Is it sunny in Sumber?
Sumber gets on average 10.2 hours of sunshine per day, roughly 3,723 hours per year over 1940-2025.
Are there tropical nights in Sumber?
Yes: Sumber has on average 365 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Sumber?
In Sumber, between 1940 and 2025, the highest apparent temperature reached 39.1 °C on 30 March 2024, and the lowest was 19.5 °C on 9 September 1963.
These forecasts and records come from our own weather API. Developer documentation →