Boyolali climate — normals and trends

Q: What is the climate of Boyolali?

Boyolali has a tropical monsoon climate (Köppen Am). Over 1940-2025, the average annual temperature is 23.1 °C and it receives 2,776 mm of precipitation per year.

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

The hottest day measured in Boyolali between 1940 and 2025 was 24 October 1961, reaching 34.1 °C.

Q: What is the coldest day in Boyolali?

The coldest day measured in Boyolali between 1940 and 2025 was 2 September 1961, at 12.5 °C.

Q: Does it snow in Boyolali?

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

Q: Has the climate of Boyolali warmed?

Yes: Boyolali warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Boyolali?

The wettest day measured in Boyolali between 1940 and 2025 was 28 July 1998, with 214 mm of rain in 24 hours.

Q: What was the windiest day in Boyolali?

The windiest day measured in Boyolali between 1940 and 2025 was 28 February 1961, with winds reaching 20.0 km/h.

Q: What is the warmest month in Boyolali?

The warmest month in Boyolali is April (23.6 °C on average); the coldest is July (22.4 °C).

Q: How much does it rain in Boyolali?

Boyolali receives on average 2,776 mm of precipitation per year, spread over about 255 rainy days.

Q: Is it sunny in Boyolali?

Boyolali gets on average 9.8 hours of sunshine per day, roughly 3,577 hours per year over 1940-2025.

Boyolali (Indonesia) has a tropical monsoon climate (Am) under the Köppen-Geiger classification. Its mean annual temperature is 23.1 °C and it receives 2,776 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 April (23.6 °C on average) and the coldest is July (22.4 °C). Rainfall peaks in February.

Boyolali averages 0 frost days, 22 hot days (≥ 30 °C) and 255 rainy days per year.

Boyolali has warmed by +1.9 °C between 1940 and 2025, or +0.22 °C per decade. This trend is statistically significant.

The hottest day of the period reached 34.1 °C (on 24 October 1961) and the coldest 12.5 °C (on 2 September 1961).

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

BoyolaliCentral Java

coords: -7.53°, 110.60°
period: 1940–2025 · 86 yrs

AmTropical monsoonWarmest monthAprilColdest monthJulyWettest monthFebruaryDriest monthAugust

Mean daily temperature

23.1°C

Average daily high

27.9°C

Average daily low

19.8°C

Annual rainfall

2,776mm

Sunshine / day

9.8h

Mean relative humidity

86%

Average peak wind

8.2km/h

Seasonal range

1.2°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

22 d/yr

Rainy days (≥ 1 mm)

255 d/yr

Annual snowfall

0.0 cm

Average feels-like high

32.5 °C

Average feels-like low

22.8 °C

Average peak gust

29.4 km/h

Tropical nights (≥ 20 °C)

180 d/yr

Solar radiation

18.2 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.9 °C

since 1940

+0.2 °C per decade · r² = 0.77 · 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

34.1 °C

24 October 1961

Coldest day

12.5 °C

2 September 1961

Wettest day

214 mm

28 July 1998

Windiest day

20.0 km/h

28 February 1961

Strongest gust

87.8 km/h

25 January 2012

Hottest feels-like

39.8 °C

21 February 2024

Coldest feels-like

12.1 °C

2 September 1961

Sunniest day

12.4 h

23 December 2023

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	31.3 °C4 February 2025	16.3 °C21 July 2025	24.1 °C	3,848 mm	46
2024	32.0 °C21 February 2024	16.0 °C12 August 2024	24.5 °C	2,976 mm	86
2023	32.6 °C29 December 2023	15.4 °C11 August 2023	24.0 °C	2,149 mm	74
2022	31.2 °C12 May 2022	15.8 °C26 July 2022	23.9 °C	3,636 mm	28
2021	31.4 °C23 October 2021	16.1 °C26 July 2021	24.0 °C	3,414 mm	35
2020	31.5 °C19 November 2020	15.5 °C26 July 2020	24.2 °C	3,359 mm	64
2019	32.2 °C21 October 2019	15.1 °C6 August 2019	24.0 °C	2,288 mm	78
2018	31.5 °C8 October 2018	14.9 °C27 July 2018	23.8 °C	2,335 mm	47
2017	30.9 °C7 March 2017	16.7 °C17 July 2017	24.0 °C	3,074 mm	28
2016	31.8 °C7 November 2016	18.3 °C24 August 2016	24.6 °C	3,827 mm	77
2015	32.5 °C16 October 2015	14.8 °C3 August 2015	24.1 °C	2,539 mm	66
2014	31.7 °C31 October 2014	16.0 °C10 September 2014	23.9 °C	2,834 mm	31
2013	31.3 °C7 May 2013	14.7 °C13 August 2013	23.9 °C	3,547 mm	29
2012	31.2 °C30 October 2012	15.7 °C16 August 2012	23.5 °C	2,701 mm	10
2011	31.0 °C22 October 2011	15.7 °C26 August 2011	23.4 °C	2,983 mm	10
2010	31.0 °C2 May 2010	18.5 °C24 July 2010	24.3 °C	4,190 mm	35
2009	30.9 °C19 October 2009	15.3 °C13 July 2009	23.6 °C	2,676 mm	22
2008	31.0 °C21 October 2008	15.3 °C24 July 2008	23.3 °C	2,586 mm	5
2007	30.4 °C1 May 2007	15.2 °C10 September 2007	23.5 °C	2,551 mm	11
2006	31.4 °C11 November 2006	14.8 °C4 September 2006	23.3 °C	2,607 mm	22
2005	31.0 °C2 February 2005	14.9 °C7 August 2005	23.5 °C	2,614 mm	12
2004	31.2 °C11 October 2004	15.0 °C18 August 2004	23.5 °C	2,633 mm	19
2003	30.9 °C30 November 2003	13.6 °C5 August 2003	23.4 °C	2,312 mm	6
2002	31.7 °C16 October 2002	15.1 °C31 August 2002	23.4 °C	2,462 mm	33
2001	30.0 °C16 September 2001	14.3 °C5 August 2001	23.0 °C	2,749 mm	1
2000	30.2 °C16 February 2000	14.6 °C23 August 2000	23.2 °C	3,401 mm	1
1999	30.9 °C24 September 1999	15.2 °C18 August 1999	23.3 °C	3,311 mm	12
1998	31.3 °C10 April 1998	17.0 °C30 August 1998	24.2 °C	3,919 mm	65
1997	31.3 °C21 October 1997	13.9 °C9 October 1997	23.2 °C	2,166 mm	26
1996	32.9 °C22 September 1996	17.5 °C4 August 1996	23.6 °C	2,838 mm	15
1995	31.0 °C13 September 1995	16.9 °C30 July 1995	23.6 °C	3,614 mm	19
1994	31.7 °C8 November 1994	14.2 °C21 June 1994	23.0 °C	2,635 mm	32
1993	32.5 °C4 November 1993	16.1 °C19 July 1993	23.6 °C	2,526 mm	25
1992	30.5 °C27 March 1992	16.0 °C17 May 1992	23.0 °C	3,359 mm	4
1991	31.8 °C6 October 1991	14.2 °C17 September 1991	22.9 °C	2,531 mm	20
1990	32.3 °C9 November 1990	15.6 °C29 July 1990	23.3 °C	2,623 mm	29
1989	30.2 °C18 September 1989	15.5 °C14 August 1989	22.9 °C	3,072 mm	3
1988	30.9 °C2 March 1988	15.7 °C29 June 1988	23.2 °C	2,954 mm	17
1987	32.2 °C22 October 1987	14.5 °C14 August 1987	23.3 °C	2,305 mm	28
1986	30.7 °C21 December 1986	14.1 °C18 August 1986	22.9 °C	3,141 mm	7
1985	30.9 °C12 October 1985	14.5 °C8 July 1985	23.1 °C	2,630 mm	7
1984	30.7 °C12 November 1984	14.4 °C28 June 1984	23.0 °C	3,738 mm	2
1983	31.3 °C31 August 1983	15.8 °C5 July 1983	23.5 °C	3,562 mm	37
1982	33.5 °C27 November 1982	13.7 °C1 September 1982	23.3 °C	2,444 mm	56
1981	31.0 °C17 October 1981	16.4 °C3 June 1981	23.1 °C	3,251 mm	9
1980	33.3 °C22 September 1980	15.2 °C9 June 1980	23.5 °C	2,543 mm	32
1979	31.1 °C26 October 1979	15.2 °C15 June 1979	23.2 °C	3,295 mm	18
1978	30.4 °C16 February 1978	15.8 °C27 August 1978	23.2 °C	3,505 mm	7
1977	33.2 °C25 October 1977	13.6 °C4 July 1977	23.0 °C	2,484 mm	25
1976	31.0 °C27 September 1976	13.6 °C18 July 1976	22.8 °C	2,112 mm	7
1975	30.3 °C20 September 1975	15.1 °C31 May 1975	22.9 °C	3,459 mm	2
1974	29.7 °C27 September 1974	15.4 °C8 June 1974	22.8 °C	3,059 mm	0
1973	30.6 °C19 October 1973	16.7 °C31 July 1973	23.3 °C	3,851 mm	8
1972	32.5 °C24 October 1972	15.0 °C4 June 1972	22.7 °C	2,002 mm	35
1971	30.7 °C15 September 1971	13.5 °C5 July 1971	22.3 °C	2,707 mm	1
1970	30.1 °C14 February 1970	14.6 °C1 July 1970	22.8 °C	2,798 mm	3
1969	31.1 °C14 October 1969	14.3 °C25 June 1969	22.9 °C	1,881 mm	12
1968	31.3 °C21 October 1968	16.2 °C11 August 1968	22.6 °C	3,346 mm	5
1967	31.8 °C27 October 1967	13.3 °C1 August 1967	22.5 °C	2,626 mm	35
1966	31.9 °C10 September 1966	14.2 °C27 June 1966	22.4 °C	2,615 mm	9
1965	33.1 °C26 October 1965	14.0 °C27 July 1965	23.0 °C	2,033 mm	43
1964	30.4 °C24 February 1964	14.2 °C3 August 1964	22.9 °C	2,521 mm	5
1963	33.1 °C27 September 1963	13.9 °C9 September 1963	23.1 °C	2,332 mm	59
1962	32.0 °C30 September 1962	14.2 °C31 August 1962	23.1 °C	3,301 mm	19
1961	34.1 °C24 October 1961	12.5 °C2 September 1961	23.0 °C	2,393 mm	54
1960	31.1 °C27 October 1960	15.5 °C1 October 1960	22.9 °C	3,029 mm	3
1959	31.9 °C25 October 1959	15.1 °C6 August 1959	23.1 °C	2,901 mm	23
1958	30.8 °C24 October 1958	15.1 °C12 June 1958	23.4 °C	3,104 mm	22
1957	32.1 °C25 October 1957	13.4 °C14 August 1957	22.8 °C	2,472 mm	33
1956	31.2 °C22 October 1956	13.3 °C14 September 1956	22.5 °C	2,504 mm	6
1955	30.5 °C25 October 1955	14.1 °C22 August 1955	22.4 °C	3,423 mm	1
1954	31.7 °C26 September 1954	14.4 °C2 August 1954	22.4 °C	2,887 mm	2
1953	32.5 °C10 October 1953	14.3 °C11 August 1953	22.7 °C	1,884 mm	27
1952	31.4 °C11 September 1952	13.7 °C20 June 1952	22.7 °C	2,719 mm	3
1951	32.1 °C30 October 1951	14.3 °C30 June 1951	22.6 °C	2,564 mm	23
1950	30.7 °C19 September 1950	14.5 °C29 July 1950	22.2 °C	2,660 mm	6
1949	30.9 °C15 September 1949	13.2 °C20 July 1949	21.9 °C	1,862 mm	1
1948	32.6 °C15 October 1948	14.2 °C13 August 1948	22.8 °C	1,253 mm	23
1947	31.1 °C11 October 1947	15.0 °C24 July 1947	22.5 °C	1,988 mm	4
1946	31.9 °C6 October 1946	14.2 °C25 May 1946	22.2 °C	1,908 mm	26
1945	30.2 °C16 October 1945	14.2 °C19 August 1945	21.9 °C	2,456 mm	3
1944	31.0 °C16 September 1944	13.3 °C3 August 1944	22.2 °C	2,559 mm	9
1943	29.5 °C27 December 1943	14.5 °C28 July 1943	21.9 °C	2,267 mm	0
1942	28.5 °C10 December 1942	14.5 °C8 July 1942	21.9 °C	2,361 mm	0
1941	31.7 °C15 September 1941	13.4 °C11 August 1941	22.1 °C	2,253 mm	7
1940	32.3 °C14 October 1940	13.9 °C11 July 1940	22.0 °C	1,932 mm	15

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

28.3 °C

+0.4 °C

Hot days (≥ 30 °C)

46 d/yr

+24

Frost days (< 0 °C)

0 d/yr

Annual rainfall

3848 mm

+1072 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	28.5 °C	+1.0 °C	461 mm	+44 mm
Feb	29.2 °C	+1.5 °C	502 mm	+76 mm
Mar	28.8 °C	+0.8 °C	485 mm	+101 mm
Apr	28.2 °C	0.0 °C	262 mm	+15 mm
May	28.5 °C	+0.4 °C	434 mm	+270 mm
Jun	28.2 °C	+0.5 °C	77 mm	-24 mm
Jul	27.3 °C	0.0 °C	41 mm	-26 mm
Aug	27.7 °C	+0.1 °C	151 mm	+97 mm
Sep	28.5 °C	+0.2 °C	137 mm	+50 mm
Oct	28.8 °C	+0.2 °C	335 mm	+154 mm
Nov	27.9 °C	-0.3 °C	596 mm	+289 mm
Dec	28.6 °C	+0.9 °C	367 mm	+24 mm

The year's extremes

Hottest day

31.3 °C

4 Feb 2025

Coldest day

16.3 °C

21 Jul 2025

Wettest day

122.5 mm

17 Feb 2025

Windiest day

15.7 km/h

27 Aug 2025

Strongest gust

48.2 km/h

31 Jan 2025

Hottest feels-like

37.9 °C

23 Dec 2025

Coldest feels-like

17.6 °C

22 Jul 2025

Sunniest day

12.2 h

28 Nov 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 Boyolali?

Boyolali has a tropical monsoon climate (Köppen Am). Over 1940-2025, the average annual temperature is 23.1 °C and it receives 2,776 mm of precipitation per year.

What is the hottest day ever recorded in Boyolali?

The hottest day measured in Boyolali between 1940 and 2025 was 24 October 1961, reaching 34.1 °C.

What is the coldest day in Boyolali?

The coldest day measured in Boyolali between 1940 and 2025 was 2 September 1961, at 12.5 °C.

Does it snow in Boyolali?

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

Has the climate of Boyolali warmed?

Yes: Boyolali warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Boyolali?

The wettest day measured in Boyolali between 1940 and 2025 was 28 July 1998, with 214 mm of rain in 24 hours.

What was the windiest day in Boyolali?

The windiest day measured in Boyolali between 1940 and 2025 was 28 February 1961, with winds reaching 20.0 km/h.

What is the warmest month in Boyolali?

The warmest month in Boyolali is April (23.6 °C on average); the coldest is July (22.4 °C).

How much does it rain in Boyolali?

Boyolali receives on average 2,776 mm of precipitation per year, spread over about 255 rainy days.

Is it sunny in Boyolali?

Boyolali gets on average 9.8 hours of sunshine per day, roughly 3,577 hours per year over 1940-2025.

Are there tropical nights in Boyolali?

Yes: Boyolali has on average 180 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Boyolali?

In Boyolali, between 1940 and 2025, the highest apparent temperature reached 39.8 °C on 21 February 2024, and the lowest was 12.1 °C on 2 September 1961.

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