Pematangsiantar climate — normals and trends

Q: What is the climate of Pematangsiantar?

Pematangsiantar has a tropical rainforest climate (Köppen Af). Over 1940-2025, the average annual temperature is 23.6 °C and it receives 3,189 mm of precipitation per year.

Q: What is the hottest day ever recorded in Pematangsiantar?

The hottest day measured in Pematangsiantar between 1940 and 2025 was 23 July 2024, reaching 34.2 °C.

Q: What is the coldest day in Pematangsiantar?

The coldest day measured in Pematangsiantar between 1940 and 2025 was 16 January 1963, at 16.1 °C.

Q: Does it snow in Pematangsiantar?

Almost never: Pematangsiantar sees virtually no snow, with about 0 frost days per year.

Q: Has the climate of Pematangsiantar warmed?

Yes: Pematangsiantar warmed by +2.3 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Pematangsiantar?

The wettest day measured in Pematangsiantar between 1940 and 2025 was 23 June 2018, with 193 mm of rain in 24 hours.

Q: What was the windiest day in Pematangsiantar?

The windiest day measured in Pematangsiantar between 1940 and 2025 was 27 November 2025, with winds reaching 19.5 km/h.

Q: What is the warmest month in Pematangsiantar?

The warmest month in Pematangsiantar is May (24.4 °C on average); the coldest is January (23.0 °C).

Q: How much does it rain in Pematangsiantar?

Pematangsiantar receives on average 3,189 mm of precipitation per year, spread over about 335 rainy days.

Q: Is it sunny in Pematangsiantar?

Pematangsiantar gets on average 9.4 hours of sunshine per day, roughly 3,431 hours per year over 1940-2025.

Pematangsiantar (Indonesia) has a tropical rainforest climate (Af) under the Köppen-Geiger classification. Its mean annual temperature is 23.6 °C and it receives 3,189 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 (24.4 °C on average) and the coldest is January (23.0 °C). Rainfall peaks in October.

Pematangsiantar averages 0 frost days, 45 hot days (≥ 30 °C) and 335 rainy days per year.

Pematangsiantar has warmed by +2.3 °C between 1940 and 2025, or +0.27 °C per decade. This trend is statistically significant.

The hottest day of the period reached 34.2 °C (on 23 July 2024) and the coldest 16.1 °C (on 16 January 1963).

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

PematangsiantarNorth Sumatra

coords: 2.96°, 99.07°
period: 1940–2025 · 86 yrs

AfTropical rainforestWarmest monthMayColdest monthJanuaryWettest monthOctoberDriest monthFebruary

Mean daily temperature

23.6°C

Average daily high

28.2°C

Average daily low

20.6°C

Annual rainfall

3,189mm

Sunshine / day

9.4h

Mean relative humidity

87%

Average peak wind

8.1km/h

Seasonal range

1.4°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

45 d/yr

Rainy days (≥ 1 mm)

335 d/yr

Annual snowfall

0.0 cm

Average feels-like high

33.7 °C

Average feels-like low

23.7 °C

Average peak gust

26.0 km/h

Tropical nights (≥ 20 °C)

262 d/yr

Solar radiation

17.9 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.3 °C

since 1940

+0.3 °C per decade · r² = 0.92 · p = < 0.001

19402025

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

34.2 °C

23 July 2024

Coldest day

16.1 °C

16 January 1963

Wettest day

193 mm

23 June 2018

Windiest day

19.5 km/h

27 November 2025

Strongest gust

48.2 km/h

21 August 2000

Hottest feels-like

41.0 °C

28 July 2024

Coldest feels-like

16.0 °C

9 February 1944

Sunniest day

12.2 h

21 June 1940

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	34.0 °C1 June 2025	19.3 °C29 November 2025	24.5 °C	3,328 mm	95
2024	34.2 °C23 July 2024	20.5 °C12 February 2024	25.1 °C	3,773 mm	132
2023	32.1 °C25 July 2023	18.9 °C18 January 2023	24.7 °C	3,465 mm	81
2022	32.2 °C18 February 2022	19.8 °C7 September 2022	24.4 °C	3,877 mm	73
2021	32.7 °C14 October 2021	19.7 °C30 June 2021	24.5 °C	3,352 mm	70
2020	32.0 °C4 August 2020	20.0 °C2 January 2020	24.6 °C	3,467 mm	81
2019	32.1 °C23 April 2019	20.0 °C7 February 2019	24.7 °C	2,913 mm	88
2018	33.2 °C10 June 2018	19.0 °C13 August 2018	24.5 °C	3,065 mm	81
2017	32.6 °C26 July 2017	19.9 °C17 January 2017	24.6 °C	3,618 mm	63
2016	32.7 °C2 July 2016	19.9 °C27 February 2016	24.8 °C	2,755 mm	99
2015	32.7 °C27 June 2015	18.2 °C3 February 2015	24.6 °C	3,065 mm	85
2014	32.7 °C25 July 2014	18.3 °C23 January 2014	24.4 °C	2,980 mm	79
2013	33.3 °C16 April 2013	19.6 °C20 July 2013	24.5 °C	3,478 mm	90
2012	32.4 °C12 June 2012	19.7 °C29 July 2012	24.5 °C	3,219 mm	64
2011	32.9 °C8 May 2011	19.3 °C10 February 2011	24.3 °C	3,590 mm	55
2010	32.3 °C24 August 2010	19.7 °C19 October 2010	24.8 °C	3,331 mm	106
2009	33.0 °C5 June 2009	18.5 °C11 January 2009	24.4 °C	3,530 mm	84
2008	33.7 °C12 May 2008	19.1 °C11 February 2008	24.1 °C	3,829 mm	50
2007	33.0 °C28 June 2007	18.5 °C4 December 2007	24.2 °C	3,672 mm	69
2006	33.0 °C28 June 2006	19.1 °C5 December 2006	24.3 °C	3,378 mm	54
2005	32.9 °C8 August 2005	19.5 °C22 January 2005	24.4 °C	2,838 mm	71
2004	33.3 °C16 May 2004	19.4 °C3 August 2004	24.2 °C	2,899 mm	40
2003	32.8 °C18 May 2003	19.6 °C29 December 2003	24.2 °C	2,927 mm	42
2002	32.3 °C21 June 2002	18.8 °C3 April 2002	24.3 °C	3,070 mm	53
2001	32.6 °C8 July 2001	18.8 °C7 July 2001	24.3 °C	3,451 mm	65
2000	32.3 °C16 July 2000	18.3 °C28 January 2000	24.0 °C	3,061 mm	56
1999	31.9 °C13 April 1999	19.2 °C28 December 1999	23.9 °C	3,420 mm	39
1998	32.5 °C20 May 1998	19.2 °C2 March 1998	24.5 °C	3,243 mm	97
1997	33.2 °C21 May 1997	18.4 °C28 January 1997	24.1 °C	3,031 mm	55
1996	32.2 °C31 July 1996	18.7 °C17 January 1996	23.9 °C	3,520 mm	62
1995	33.7 °C14 May 1995	18.5 °C6 February 1995	24.0 °C	3,736 mm	40
1994	31.6 °C19 July 1994	18.9 °C11 December 1994	23.9 °C	3,709 mm	40
1993	31.9 °C30 July 1993	18.4 °C5 March 1993	23.8 °C	3,680 mm	36
1992	31.9 °C31 July 1992	18.4 °C17 December 1992	23.7 °C	3,175 mm	39
1991	31.9 °C12 June 1991	18.0 °C8 January 1991	23.7 °C	3,117 mm	37
1990	33.2 °C26 August 1990	18.0 °C4 January 1990	23.7 °C	2,849 mm	43
1989	32.3 °C21 July 1989	18.0 °C6 February 1989	23.6 °C	3,295 mm	32
1988	32.0 °C2 June 1988	18.7 °C11 December 1988	24.0 °C	3,403 mm	74
1987	32.6 °C14 June 1987	18.3 °C5 February 1987	24.0 °C	3,442 mm	55
1986	32.7 °C11 August 1986	17.9 °C11 February 1986	23.8 °C	3,261 mm	65
1985	32.5 °C29 May 1985	16.3 °C22 June 1985	23.6 °C	3,153 mm	54
1984	32.8 °C13 August 1984	18.3 °C31 December 1984	23.5 °C	3,617 mm	38
1983	31.3 °C2 April 1983	18.7 °C25 December 1983	23.9 °C	2,808 mm	59
1982	31.2 °C9 June 1982	17.8 °C18 January 1982	23.6 °C	2,951 mm	36
1981	32.9 °C8 August 1981	17.4 °C31 January 1981	23.7 °C	2,910 mm	75
1980	31.5 °C21 May 1980	17.4 °C16 January 1980	23.6 °C	2,947 mm	36
1979	32.7 °C21 June 1979	17.8 °C26 December 1979	23.7 °C	2,904 mm	74
1978	32.1 °C16 May 1978	18.0 °C4 January 1978	23.6 °C	2,798 mm	46
1977	31.6 °C25 June 1977	17.5 °C19 February 1977	23.4 °C	2,914 mm	37
1976	32.4 °C25 May 1976	17.3 °C29 January 1976	23.1 °C	2,744 mm	29
1975	31.5 °C13 March 1975	17.3 °C22 January 1975	23.1 °C	2,831 mm	16
1974	31.3 °C22 May 1974	17.5 °C15 January 1974	23.2 °C	2,876 mm	34
1973	31.8 °C16 June 1973	18.0 °C12 January 1973	23.4 °C	3,015 mm	30
1972	32.2 °C13 July 1972	16.6 °C18 January 1972	23.2 °C	2,899 mm	28
1971	31.6 °C1 October 1971	17.3 °C31 January 1971	22.9 °C	3,082 mm	26
1970	32.5 °C13 June 1970	18.1 °C18 February 1970	23.4 °C	2,966 mm	46
1969	33.1 °C10 July 1969	17.0 °C27 July 1969	23.4 °C	3,114 mm	52
1968	32.2 °C7 May 1968	16.1 °C22 February 1968	22.9 °C	2,920 mm	8
1967	30.9 °C28 May 1967	17.2 °C12 February 1967	22.8 °C	3,212 mm	8
1966	29.9 °C27 July 1966	17.9 °C26 February 1966	22.9 °C	3,772 mm	0
1965	32.4 °C28 May 1965	16.2 °C14 January 1965	23.0 °C	3,289 mm	36
1964	33.3 °C28 May 1964	17.2 °C31 January 1964	23.3 °C	2,866 mm	57
1963	31.8 °C3 June 1963	16.1 °C16 January 1963	23.1 °C	2,676 mm	29
1962	33.3 °C24 May 1962	17.0 °C17 February 1962	23.1 °C	2,963 mm	44
1961	33.1 °C26 May 1961	17.5 °C22 January 1961	23.1 °C	2,891 mm	46
1960	32.1 °C31 May 1960	17.3 °C19 January 1960	23.3 °C	3,166 mm	56
1959	31.8 °C3 June 1959	18.0 °C15 September 1959	23.1 °C	3,194 mm	32
1958	32.0 °C25 August 1958	17.6 °C27 February 1958	23.4 °C	2,939 mm	29
1957	30.9 °C1 July 1957	17.8 °C6 January 1957	23.1 °C	3,276 mm	13
1956	31.4 °C15 May 1956	16.6 °C13 March 1956	22.7 °C	3,753 mm	10
1955	31.5 °C1 June 1955	17.3 °C17 February 1955	22.8 °C	3,428 mm	8
1954	30.6 °C7 June 1954	18.6 °C13 January 1954	22.8 °C	3,745 mm	2
1953	30.1 °C13 May 1953	17.4 °C10 February 1953	23.1 °C	3,399 mm	5
1952	30.9 °C21 October 1952	17.8 °C19 January 1952	23.2 °C	3,306 mm	6
1951	29.8 °C7 May 1951	17.4 °C2 March 1951	22.9 °C	2,412 mm	0
1950	30.0 °C4 August 1950	17.2 °C22 February 1950	22.9 °C	3,022 mm	3
1949	31.6 °C26 March 1949	16.3 °C29 January 1949	23.2 °C	1,031 mm	64
1948	29.2 °C21 June 1948	16.7 °C18 January 1948	22.5 °C	2,866 mm	0
1947	28.7 °C11 June 1947	18.3 °C6 February 1947	22.5 °C	4,051 mm	0
1946	31.7 °C27 June 1946	17.6 °C29 January 1946	22.5 °C	3,327 mm	9
1945	29.8 °C7 June 1945	17.8 °C29 December 1945	22.4 °C	3,617 mm	0
1944	30.2 °C23 August 1944	16.2 °C9 February 1944	22.5 °C	3,138 mm	1
1943	30.6 °C20 August 1943	16.8 °C13 January 1943	22.2 °C	2,634 mm	2
1942	29.8 °C26 June 1942	17.8 °C5 February 1942	22.4 °C	3,346 mm	0
1941	30.3 °C14 June 1941	18.0 °C30 December 1941	22.6 °C	3,694 mm	2
1940	30.4 °C22 July 1940	17.0 °C23 June 1940	22.6 °C	2,961 mm	5

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?

Year

Across the whole year

Average daily high

28.9 °C

+0.7 °C

Hot days (≥ 30 °C)

95 d/yr

+50

Frost days (< 0 °C)

0 d/yr

Annual rainfall

3328 mm

+139 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	27.6 °C	+0.3 °C	412 mm	+203 mm
Feb	28.5 °C	+0.6 °C	216 mm	+40 mm
Mar	29.1 °C	+0.7 °C	339 mm	+129 mm
Apr	28.9 °C	+0.2 °C	324 mm	+82 mm
May	30.2 °C	+1.1 °C	260 mm	+0 mm
Jun	30.0 °C	+0.9 °C	170 mm	-37 mm
Jul	30.3 °C	+1.6 °C	130 mm	-93 mm
Aug	29.7 °C	+1.1 °C	203 mm	-76 mm
Sep	29.0 °C	+0.9 °C	293 mm	-66 mm
Oct	28.6 °C	+0.8 °C	290 mm	-91 mm
Nov	27.4 °C	-0.1 °C	416 mm	+68 mm
Dec	27.3 °C	+0.1 °C	275 mm	-20 mm

The year's extremes

Hottest day

34.0 °C

1 Jun 2025

Coldest day

19.3 °C

29 Nov 2025

Wettest day

110.6 mm

27 Nov 2025

Windiest day

19.5 km/h

27 Nov 2025

Strongest gust

42.5 km/h

27 Nov 2025

Hottest feels-like

39.7 °C

1 Jun 2025

Coldest feels-like

21.8 °C

23 Aug 2025

Sunniest day

12.0 h

10 Jul 2025

What was the weather like that day?

Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.

Date

Frequently asked questions

What is the climate of Pematangsiantar?

Pematangsiantar has a tropical rainforest climate (Köppen Af). Over 1940-2025, the average annual temperature is 23.6 °C and it receives 3,189 mm of precipitation per year.

What is the hottest day ever recorded in Pematangsiantar?

The hottest day measured in Pematangsiantar between 1940 and 2025 was 23 July 2024, reaching 34.2 °C.

What is the coldest day in Pematangsiantar?

The coldest day measured in Pematangsiantar between 1940 and 2025 was 16 January 1963, at 16.1 °C.

Does it snow in Pematangsiantar?

Almost never: Pematangsiantar sees virtually no snow, with about 0 frost days per year.

Has the climate of Pematangsiantar warmed?

Yes: Pematangsiantar warmed by +2.3 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Pematangsiantar?

The wettest day measured in Pematangsiantar between 1940 and 2025 was 23 June 2018, with 193 mm of rain in 24 hours.

What was the windiest day in Pematangsiantar?

The windiest day measured in Pematangsiantar between 1940 and 2025 was 27 November 2025, with winds reaching 19.5 km/h.

What is the warmest month in Pematangsiantar?

The warmest month in Pematangsiantar is May (24.4 °C on average); the coldest is January (23.0 °C).

How much does it rain in Pematangsiantar?

Pematangsiantar receives on average 3,189 mm of precipitation per year, spread over about 335 rainy days.

Is it sunny in Pematangsiantar?

Pematangsiantar gets on average 9.4 hours of sunshine per day, roughly 3,431 hours per year over 1940-2025.

Are there tropical nights in Pematangsiantar?

Yes: Pematangsiantar has on average 262 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Pematangsiantar?

In Pematangsiantar, between 1940 and 2025, the highest apparent temperature reached 41.0 °C on 28 July 2024, and the lowest was 16.0 °C on 9 February 1944.

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