Binjai climate — normals and trends
Binjai (Indonesia) has a tropical rainforest climate (Af) under the Köppen-Geiger classification. Its mean annual temperature is 25.2 °C and it receives 3,097 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 (25.9 °C on average) and the coldest is December (24.4 °C). Rainfall peaks in October.
Binjai averages 0 frost days, 217 hot days (≥ 30 °C) and 323 rainy days per year.
Binjai has warmed by +2.4 °C between 1940 and 2025, or +0.28 °C per decade. This trend is statistically significant.
The hottest day of the period reached 37.8 °C (on 20 August 1981) and the coldest 16.1 °C (on 9 February 1944).
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
BinjaiNorth Sumatra
- coords
- 3.60°, 98.49°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
25.2°C
Average daily high
30.4°C
Average daily low
21.2°C
Annual rainfall
3,097mm
Sunshine / day
9.5h
Mean relative humidity
85%
Average peak wind
7.9km/h
Seasonal range
1.5°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
217 d/yr
Rainy days (≥ 1 mm)
323 d/yr
Annual snowfall
0.0 cm
Average feels-like high
36.5 °C
Average feels-like low
24.3 °C
Average peak gust
23.5 km/h
Tropical nights (≥ 20 °C)
313 d/yr
Solar radiation
18.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.4 °C
since 1940
+0.3 °C per decade · r² = 0.88 · 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
37.8 °C
20 August 1981
Coldest day
16.1 °C
9 February 1944
Wettest day
190 mm
27 November 2025
Windiest day
18.0 km/h
27 November 2025
Strongest gust
45.4 km/h
20 July 2025
Hottest feels-like
43.9 °C
22 May 1998
Coldest feels-like
15.7 °C
23 June 1940
Sunniest day
12.2 h
3 July 2016
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 29.2 °C | 0.0 °C | 368 mm | +147 mm |
| Feb | 30.1 °C | +0.2 °C | 226 mm | +48 mm |
| Mar | 30.8 °C | +0.3 °C | 283 mm | +65 mm |
| Apr | 30.7 °C | -0.1 °C | 370 mm | +116 mm |
| May | 32.2 °C | +0.9 °C | 268 mm | -2 mm |
| Jun | 32.1 °C | +0.5 °C | 133 mm | -49 mm |
| Jul | 33.1 °C | +1.7 °C | 94 mm | -92 mm |
| Aug | 31.8 °C | +0.5 °C | 188 mm | -48 mm |
| Sep | 31.6 °C | +1.1 °C | 172 mm | -144 mm |
| Oct | 30.4 °C | +0.5 °C | 197 mm | -162 mm |
| Nov | 29.4 °C | +0.2 °C | 590 mm | +234 mm |
| Dec | 28.9 °C | +0.1 °C | 314 mm | -8 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 Binjai?
Binjai has a tropical rainforest climate (Köppen Af). Over 1940-2025, the average annual temperature is 25.2 °C and it receives 3,097 mm of precipitation per year.
What is the hottest day ever recorded in Binjai?
The hottest day measured in Binjai between 1940 and 2025 was 20 August 1981, reaching 37.8 °C.
What is the coldest day in Binjai?
The coldest day measured in Binjai between 1940 and 2025 was 9 February 1944, at 16.1 °C.
Does it snow in Binjai?
Almost never: Binjai sees virtually no snow, with about 0 frost days per year.
Has the climate of Binjai warmed?
Yes: Binjai warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Binjai?
The wettest day measured in Binjai between 1940 and 2025 was 27 November 2025, with 190 mm of rain in 24 hours.
What was the windiest day in Binjai?
The windiest day measured in Binjai between 1940 and 2025 was 27 November 2025, with winds reaching 18.0 km/h.
What is the warmest month in Binjai?
The warmest month in Binjai is May (25.9 °C on average); the coldest is December (24.4 °C).
How much does it rain in Binjai?
Binjai receives on average 3,097 mm of precipitation per year, spread over about 323 rainy days.
Is it sunny in Binjai?
Binjai gets on average 9.5 hours of sunshine per day, roughly 3,468 hours per year over 1940-2025.
Are there tropical nights in Binjai?
Yes: Binjai has on average 313 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Binjai?
In Binjai, between 1940 and 2025, the highest apparent temperature reached 43.9 °C on 22 May 1998, and the lowest was 15.7 °C on 23 June 1940.
Compare Binjai with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Binjai