Lasem climate — normals and trends

Q: What is the climate of Lasem?

Lasem has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 26.8 °C and it receives 1,691 mm of precipitation per year.

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

The hottest day measured in Lasem between 1940 and 2025 was 17 October 1968, reaching 33.6 °C.

Q: What is the coldest day in Lasem?

The coldest day measured in Lasem between 1940 and 2025 was 18 June 1941, at 20.5 °C.

Q: Does it snow in Lasem?

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

Q: Has the climate of Lasem warmed?

Yes: Lasem warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Lasem?

The wettest day measured in Lasem between 1940 and 2025 was 27 March 1986, with 191 mm of rain in 24 hours.

Q: What was the windiest day in Lasem?

The windiest day measured in Lasem between 1940 and 2025 was 12 January 1981, with winds reaching 40.4 km/h.

Q: What is the warmest month in Lasem?

The warmest month in Lasem is October (27.5 °C on average); the coldest is January (26.3 °C).

Q: How much does it rain in Lasem?

Lasem receives on average 1,691 mm of precipitation per year, spread over about 221 rainy days.

Q: Is it sunny in Lasem?

Lasem gets on average 10.5 hours of sunshine per day, roughly 3,833 hours per year over 1940-2025.

Lasem (Indonesia) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 26.8 °C and it receives 1,691 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 (27.5 °C on average) and the coldest is January (26.3 °C). Rainfall peaks in January.

Lasem averages 0 frost days, 140 hot days (≥ 30 °C) and 221 rainy days per year.

Lasem has warmed by +1.3 °C between 1940 and 2025, or +0.15 °C per decade. This trend is statistically significant.

The hottest day of the period reached 33.6 °C (on 17 October 1968) and the coldest 20.5 °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.

Climate normals · ERA5

LasemCentral Java

coords: -6.69°, 111.45°
period: 1940–2025 · 86 yrs

AwTropical savannaWarmest monthOctoberColdest monthJanuaryWettest monthJanuaryDriest monthAugust

Mean daily temperature

26.8°C

Average daily high

29.6°C

Average daily low

24.7°C

Annual rainfall

1,691mm

Sunshine / day

10.5h

Mean relative humidity

79%

Average peak wind

16.4km/h

Seasonal range

1.2°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

140 d/yr

Rainy days (≥ 1 mm)

221 d/yr

Annual snowfall

0.0 cm

Average feels-like high

34.8 °C

Average feels-like low

28.5 °C

Average peak gust

29.2 km/h

Tropical nights (≥ 20 °C)

365 d/yr

Solar radiation

20.6 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.3 °C

since 1940

+0.2 °C per decade · r² = 0.73 · 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

33.6 °C

17 October 1968

Coldest day

20.5 °C

18 June 1941

Wettest day

191 mm

27 March 1986

Windiest day

40.4 km/h

12 January 1981

Strongest gust

70.6 km/h

14 March 2012

Hottest feels-like

40.8 °C

4 April 2024

Coldest feels-like

20.0 °C

2 July 1986

Sunniest day

12.4 h

13 December 1940

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	32.4 °C16 October 2025	22.5 °C10 July 2025	27.5 °C	2,201 mm	204
2024	32.7 °C27 August 2024	23.1 °C14 July 2024	28.0 °C	1,866 mm	295
2023	33.5 °C28 October 2023	22.8 °C11 August 2023	27.7 °C	1,428 mm	269
2022	32.4 °C26 September 2022	22.7 °C26 July 2022	27.3 °C	2,283 mm	190
2021	32.5 °C12 October 2021	23.3 °C7 July 2021	27.5 °C	1,943 mm	227
2020	33.0 °C4 October 2020	23.0 °C30 July 2020	27.7 °C	1,872 mm	261
2019	33.0 °C2 December 2019	22.7 °C7 August 2019	27.6 °C	1,400 mm	264
2018	32.7 °C17 December 2018	22.0 °C4 August 2018	27.5 °C	1,384 mm	256
2017	32.8 °C15 October 2017	23.4 °C4 August 2017	27.4 °C	1,949 mm	206
2016	31.6 °C7 May 2016	24.2 °C19 June 2016	27.7 °C	2,414 mm	217
2015	33.2 °C22 November 2015	23.0 °C21 August 2015	27.5 °C	1,550 mm	223
2014	32.5 °C9 October 2014	23.5 °C17 August 2014	27.4 °C	1,635 mm	197
2013	32.3 °C25 September 2013	22.5 °C31 July 2013	27.3 °C	2,175 mm	176
2012	32.1 °C23 October 2012	22.5 °C1 September 2012	27.1 °C	1,485 mm	167
2011	31.8 °C15 October 2011	22.3 °C17 June 2011	27.0 °C	1,700 mm	142
2010	31.9 °C20 April 2010	24.1 °C23 July 2010	27.3 °C	2,692 mm	142
2009	32.4 °C31 October 2009	22.3 °C12 July 2009	27.3 °C	1,393 mm	191
2008	32.1 °C20 October 2008	22.0 °C28 July 2008	27.1 °C	1,572 mm	151
2007	32.3 °C25 September 2007	22.6 °C10 July 2007	27.2 °C	1,523 mm	169
2006	32.4 °C19 November 2006	22.2 °C14 July 2006	27.1 °C	1,426 mm	163
2005	32.2 °C7 October 2005	22.6 °C7 August 2005	27.3 °C	1,592 mm	182
2004	32.5 °C16 November 2004	23.0 °C6 August 2004	27.2 °C	1,449 mm	155
2003	32.6 °C9 November 2003	22.2 °C9 September 2003	27.2 °C	1,586 mm	180
2002	32.6 °C12 October 2002	22.5 °C9 September 2002	27.1 °C	1,316 mm	163
2001	31.7 °C15 September 2001	22.2 °C4 July 2001	26.8 °C	1,675 mm	87
2000	32.0 °C10 September 2000	23.0 °C26 June 2000	26.8 °C	1,992 mm	109
1999	31.9 °C31 March 1999	22.9 °C4 September 1999	26.9 °C	1,966 mm	143
1998	32.3 °C12 September 1998	24.3 °C28 July 1998	27.4 °C	2,563 mm	209
1997	33.3 °C30 October 1997	21.0 °C9 October 1997	27.0 °C	1,169 mm	151
1996	32.0 °C19 September 1996	23.1 °C4 August 1996	27.0 °C	1,832 mm	164
1995	32.2 °C19 October 1995	23.1 °C11 August 1995	27.0 °C	2,149 mm	138
1994	32.0 °C22 October 1994	21.5 °C31 August 1994	26.7 °C	1,675 mm	106
1993	32.1 °C3 November 1993	23.2 °C9 August 1993	26.9 °C	1,540 mm	129
1992	31.3 °C23 September 1992	23.2 °C18 September 1992	26.7 °C	1,869 mm	98
1991	31.9 °C6 October 1991	22.1 °C16 August 1991	26.7 °C	1,707 mm	131
1990	33.2 °C3 November 1990	22.7 °C29 July 1990	27.1 °C	1,614 mm	163
1989	32.3 °C11 October 1989	22.5 °C1 August 1989	26.7 °C	1,907 mm	99
1988	32.8 °C14 September 1988	22.7 °C13 July 1988	27.0 °C	1,895 mm	166
1987	33.4 °C3 November 1987	22.4 °C16 August 1987	27.1 °C	1,602 mm	190
1986	31.8 °C14 November 1986	20.8 °C2 July 1986	26.6 °C	2,234 mm	129
1985	32.4 °C14 October 1985	22.6 °C23 July 1985	26.7 °C	1,725 mm	120
1984	31.9 °C28 October 1984	21.7 °C28 June 1984	26.5 °C	2,197 mm	87
1983	32.3 °C27 September 1983	22.7 °C28 June 1983	27.0 °C	2,366 mm	156
1982	32.6 °C28 November 1982	21.6 °C2 September 1982	26.8 °C	1,356 mm	148
1981	32.2 °C16 October 1981	23.3 °C12 August 1981	26.7 °C	1,884 mm	125
1980	32.3 °C17 October 1980	23.1 °C19 March 1980	27.0 °C	1,754 mm	172
1979	32.9 °C14 October 1979	22.4 °C21 June 1979	26.8 °C	1,642 mm	148
1978	31.3 °C30 September 1978	22.4 °C20 July 1978	26.6 °C	2,240 mm	81
1977	32.6 °C25 October 1977	21.3 °C10 July 1977	26.6 °C	1,692 mm	93
1976	32.7 °C21 October 1976	22.0 °C18 July 1976	26.5 °C	1,283 mm	82
1975	31.1 °C20 August 1975	22.2 °C31 May 1975	26.3 °C	2,395 mm	56
1974	31.7 °C2 November 1974	22.5 °C19 July 1974	26.3 °C	1,736 mm	45
1973	32.7 °C15 October 1973	22.4 °C31 July 1973	26.8 °C	2,392 mm	103
1972	32.9 °C28 October 1972	22.2 °C21 July 1972	26.6 °C	1,248 mm	118
1971	32.9 °C5 October 1971	21.5 °C5 July 1971	26.1 °C	1,786 mm	64
1970	32.1 °C11 October 1970	22.2 °C1 July 1970	26.5 °C	1,812 mm	86
1969	32.1 °C14 October 1969	22.4 °C25 June 1969	27.0 °C	1,178 mm	203
1968	33.6 °C17 October 1968	21.9 °C10 August 1968	26.2 °C	2,224 mm	65
1967	32.2 °C1 November 1967	21.7 °C1 August 1967	26.5 °C	1,704 mm	161
1966	31.9 °C13 July 1966	21.4 °C27 June 1966	26.5 °C	1,951 mm	119
1965	32.3 °C27 October 1965	22.6 °C1 September 1965	26.6 °C	1,389 mm	138
1964	31.6 °C21 August 1964	22.1 °C29 June 1964	26.6 °C	1,458 mm	90
1963	32.2 °C14 November 1963	21.4 °C14 August 1963	26.7 °C	1,263 mm	167
1962	32.2 °C5 October 1962	22.6 °C31 July 1962	26.6 °C	1,841 mm	131
1961	32.9 °C8 October 1961	21.2 °C18 July 1961	26.8 °C	1,281 mm	172
1960	32.7 °C15 October 1960	21.9 °C22 June 1960	26.7 °C	1,779 mm	147
1959	32.8 °C7 November 1959	22.0 °C3 August 1959	26.7 °C	1,760 mm	122
1958	31.9 °C23 September 1958	23.1 °C11 June 1958	26.8 °C	2,058 mm	134
1957	32.5 °C9 November 1957	20.9 °C18 August 1957	26.6 °C	1,484 mm	143
1956	32.4 °C22 October 1956	21.6 °C8 July 1956	26.2 °C	1,786 mm	66
1955	32.3 °C8 October 1955	21.7 °C23 August 1955	26.1 °C	2,040 mm	50
1954	31.5 °C21 October 1954	21.6 °C2 August 1954	26.2 °C	1,908 mm	46
1953	33.5 °C19 October 1953	21.5 °C12 August 1953	26.8 °C	944 mm	147
1952	32.5 °C25 September 1952	21.7 °C20 June 1952	26.6 °C	1,399 mm	120
1951	32.4 °C25 November 1951	21.4 °C30 June 1951	26.5 °C	1,246 mm	119
1950	32.1 °C10 September 1950	22.3 °C17 July 1950	26.4 °C	1,460 mm	77
1949	32.5 °C2 December 1949	20.5 °C20 July 1949	26.3 °C	1,261 mm	82
1948	32.4 °C3 November 1948	22.7 °C20 August 1948	26.9 °C	733 mm	181
1947	32.9 °C6 October 1947	22.4 °C19 June 1947	26.6 °C	1,084 mm	107
1946	32.6 °C25 September 1946	21.3 °C27 May 1946	26.5 °C	1,103 mm	125
1945	31.8 °C4 October 1945	21.6 °C19 August 1945	26.1 °C	1,656 mm	59
1944	32.1 °C20 October 1944	21.7 °C3 August 1944	26.2 °C	1,567 mm	64
1943	31.7 °C26 November 1943	21.8 °C28 July 1943	26.1 °C	979 mm	61
1942	32.2 °C26 August 1942	21.2 °C8 July 1942	26.0 °C	1,614 mm	42
1941	32.2 °C28 September 1941	20.5 °C18 June 1941	26.4 °C	1,342 mm	78
1940	32.7 °C5 November 1940	21.5 °C12 July 1940	26.4 °C	1,249 mm	105

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

30.0 °C

+0.4 °C

Hot days (≥ 30 °C)

204 d/yr

+64

Frost days (< 0 °C)

0 d/yr

Annual rainfall

2201 mm

+510 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	29.5 °C	+0.8 °C	361 mm	+96 mm
Feb	29.7 °C	+1.1 °C	186 mm	-41 mm
Mar	29.8 °C	+0.8 °C	245 mm	+23 mm
Apr	29.9 °C	+0.5 °C	149 mm	-17 mm
May	29.7 °C	+0.1 °C	362 mm	+239 mm
Jun	29.8 °C	+0.3 °C	99 mm	+27 mm
Jul	29.9 °C	+0.3 °C	22 mm	-20 mm
Aug	29.9 °C	-0.1 °C	95 mm	+73 mm
Sep	30.5 °C	0.0 °C	107 mm	+72 mm
Oct	31.0 °C	+0.3 °C	148 mm	+61 mm
Nov	30.1 °C	0.0 °C	162 mm	-10 mm
Dec	30.0 °C	+0.7 °C	266 mm	+7 mm

The year's extremes

Hottest day

32.4 °C

16 Oct 2025

Coldest day

22.5 °C

10 Jul 2025

Wettest day

133.0 mm

17 May 2025

Windiest day

30.1 km/h

5 Feb 2025

Strongest gust

55.4 km/h

5 Feb 2025

Hottest feels-like

39.4 °C

3 Oct 2025

Coldest feels-like

23.8 °C

10 Jul 2025

Sunniest day

12.0 h

25 Dec 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 Lasem?

Lasem has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 26.8 °C and it receives 1,691 mm of precipitation per year.

What is the hottest day ever recorded in Lasem?

The hottest day measured in Lasem between 1940 and 2025 was 17 October 1968, reaching 33.6 °C.

What is the coldest day in Lasem?

The coldest day measured in Lasem between 1940 and 2025 was 18 June 1941, at 20.5 °C.

Does it snow in Lasem?

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

Has the climate of Lasem warmed?

Yes: Lasem warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Lasem?

The wettest day measured in Lasem between 1940 and 2025 was 27 March 1986, with 191 mm of rain in 24 hours.

What was the windiest day in Lasem?

The windiest day measured in Lasem between 1940 and 2025 was 12 January 1981, with winds reaching 40.4 km/h.

What is the warmest month in Lasem?

The warmest month in Lasem is October (27.5 °C on average); the coldest is January (26.3 °C).

How much does it rain in Lasem?

Lasem receives on average 1,691 mm of precipitation per year, spread over about 221 rainy days.

Is it sunny in Lasem?

Lasem gets on average 10.5 hours of sunshine per day, roughly 3,833 hours per year over 1940-2025.

Are there tropical nights in Lasem?

Yes: Lasem has on average 365 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Lasem?

In Lasem, between 1940 and 2025, the highest apparent temperature reached 40.8 °C on 4 April 2024, and the lowest was 20.0 °C on 2 July 1986.

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