Ilām climate — normals and trends

Q: What is the climate of Ilām?

Ilām has a subtropical highland, dry winter climate (Köppen Cwb). Over 1940-2025, the average annual temperature is 16.5 °C and it receives 3,096 mm of precipitation per year.

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

The hottest day measured in Ilām between 1940 and 2025 was 26 May 1957, reaching 33.6 °C.

Q: What is the coldest day in Ilām?

The coldest day measured in Ilām between 1940 and 2025 was 25 January 1953, at -5.0 °C.

Q: Does it snow in Ilām?

Almost never: Ilām sees virtually no snow, with about 1 frost days per year.

Q: Has the climate of Ilām warmed?

Yes: Ilām warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Ilām?

The wettest day measured in Ilām between 1940 and 2025 was 2 September 1998, with 343 mm of rain in 24 hours.

Q: What was the windiest day in Ilām?

The windiest day measured in Ilām between 1940 and 2025 was 11 April 1976, with winds reaching 17.3 km/h.

Q: What is the warmest month in Ilām?

The warmest month in Ilām is July (21.2 °C on average); the coldest is January (9.1 °C).

Q: How much does it rain in Ilām?

Ilām receives on average 3,096 mm of precipitation per year, spread over about 231 rainy days.

Q: Is it sunny in Ilām?

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

Ilām (Nepal) has a subtropical highland, dry winter climate (Cwb) under the Köppen-Geiger classification. Its mean annual temperature is 16.5 °C and it receives 3,096 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 July (21.2 °C on average) and the coldest is January (9.1 °C). Rainfall peaks in July.

Ilām averages 1 frost days, 1 hot days (≥ 30 °C) and 231 rainy days per year.

Ilām has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.

The hottest day of the period reached 33.6 °C (on 26 May 1957) and the coldest -5.0 °C (on 25 January 1953).

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

IlāmKoshi

coords: 26.91°, 87.93°
period: 1940–2025 · 86 yrs

CwbSubtropical highland, dry winterWarmest monthJulyColdest monthJanuaryWettest monthJulyDriest monthDecember

Mean daily temperature

16.5°C

Average daily high

21.2°C

Average daily low

12.6°C

Annual rainfall

3,096mm

Sunshine / day

9.4h

Mean relative humidity

83%

Average peak wind

7.0km/h

Seasonal range

12.1°C

Frost days (< 0 °C)

1 d/yr

Hot days (≥ 30 °C)

1 d/yr

Rainy days (≥ 1 mm)

231 d/yr

Annual snowfall

0.4 cm

Average feels-like high

22.6 °C

Average feels-like low

12.9 °C

Average peak gust

31.4 km/h

Tropical nights (≥ 20 °C)

13 d/yr

Solar radiation

15.3 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.7 °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

26 May 1957

Coldest day

-5.0 °C

25 January 1953

Wettest day

343 mm

2 September 1998

Windiest day

17.3 km/h

11 April 1976

Strongest gust

91.8 km/h

28 May 1989

Hottest feels-like

36.0 °C

4 August 2020

Coldest feels-like

-8.5 °C

25 January 1953

Snowiest day

6.8 cm

5 February 2022

Sunniest day

13.4 h

3 June 1958

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	29.5 °C23 July 2025	4.8 °C14 January 2025	17.8 °C	3,122 mm	0	0
2024	30.1 °C23 September 2024	0.6 °C28 January 2024	17.5 °C	3,543 mm	1	0
2023	29.2 °C8 June 2023	2.5 °C6 January 2023	17.5 °C	2,938 mm	0	0
2022	29.6 °C15 July 2022	-0.7 °C6 February 2022	17.3 °C	2,751 mm	0	2
2021	28.8 °C24 May 2021	0.6 °C31 January 2021	17.2 °C	3,376 mm	0	0
2020	30.0 °C4 August 2020	1.2 °C25 January 2020	16.8 °C	3,840 mm	1	0
2019	29.6 °C6 August 2019	0.9 °C30 January 2019	17.0 °C	3,479 mm	0	0
2018	29.1 °C20 July 2018	1.0 °C8 January 2018	16.8 °C	2,992 mm	0	0
2017	29.5 °C18 July 2017	1.6 °C14 January 2017	17.4 °C	2,862 mm	0	0
2016	28.7 °C9 April 2016	2.0 °C29 January 2016	17.3 °C	3,782 mm	0	0
2015	27.4 °C19 September 2015	1.4 °C20 January 2015	16.9 °C	2,832 mm	0	0
2014	28.3 °C25 April 2014	2.8 °C26 December 2014	17.1 °C	2,639 mm	0	0
2013	29.2 °C12 April 2013	-1.9 °C11 January 2013	17.2 °C	3,326 mm	0	3
2012	29.2 °C15 May 2012	0.7 °C15 January 2012	16.8 °C	3,111 mm	0	0
2011	28.5 °C14 June 2011	0.6 °C17 January 2011	16.8 °C	3,600 mm	0	0
2010	28.7 °C8 April 2010	2.4 °C29 December 2010	17.6 °C	3,077 mm	0	0
2009	28.6 °C23 April 2009	2.5 °C28 December 2009	17.5 °C	2,932 mm	0	0
2008	28.4 °C9 August 2008	1.8 °C20 February 2008	16.9 °C	3,502 mm	0	0
2007	28.7 °C5 May 2007	0.7 °C16 January 2007	17.0 °C	3,433 mm	0	0
2006	29.5 °C11 August 2006	3.0 °C25 January 2006	17.3 °C	2,438 mm	0	0
2005	28.8 °C18 April 2005	2.8 °C30 December 2005	17.0 °C	2,604 mm	0	0
2004	28.5 °C8 May 2004	1.7 °C29 January 2004	16.8 °C	2,746 mm	0	0
2003	29.4 °C24 July 2003	1.8 °C23 January 2003	16.8 °C	3,577 mm	0	0
2002	27.5 °C13 May 2002	3.1 °C15 January 2002	16.9 °C	3,077 mm	0	0
2001	29.0 °C7 April 2001	1.0 °C9 January 2001	16.9 °C	2,696 mm	0	0
2000	27.8 °C13 May 2000	1.6 °C3 February 2000	16.5 °C	3,030 mm	0	0
1999	28.1 °C1 August 1999	1.1 °C14 January 1999	17.3 °C	3,262 mm	0	0
1998	28.4 °C20 May 1998	2.6 °C23 January 1998	17.1 °C	4,296 mm	0	0
1997	29.1 °C27 August 1997	0.4 °C19 February 1997	16.1 °C	3,272 mm	0	0
1996	29.2 °C15 April 1996	2.6 °C8 January 1996	17.0 °C	3,441 mm	0	0
1995	28.7 °C25 April 1995	-0.8 °C2 January 1995	17.0 °C	3,538 mm	0	3
1994	29.2 °C5 May 1994	1.2 °C26 December 1994	17.0 °C	2,400 mm	0	0
1993	27.6 °C26 May 1993	0.6 °C23 February 1993	16.5 °C	3,206 mm	0	0
1992	32.4 °C14 April 1992	1.0 °C3 January 1992	16.4 °C	1,822 mm	2	0
1991	28.2 °C16 April 1991	1.8 °C4 January 1991	16.6 °C	2,914 mm	0	0
1990	27.7 °C1 September 1990	2.1 °C1 January 1990	16.6 °C	3,532 mm	0	0
1989	30.3 °C7 May 1989	-0.5 °C20 February 1989	16.5 °C	3,557 mm	4	1
1988	29.9 °C11 April 1988	1.2 °C26 January 1988	17.1 °C	3,263 mm	0	0
1987	29.4 °C18 May 1987	1.6 °C9 January 1987	16.8 °C	3,462 mm	0	0
1986	28.8 °C30 March 1986	0.2 °C29 December 1986	16.4 °C	2,580 mm	0	0
1985	28.1 °C14 April 1985	1.4 °C9 January 1985	16.5 °C	3,381 mm	0	0
1984	29.1 °C4 April 1984	1.2 °C4 January 1984	16.4 °C	2,716 mm	0	0
1983	27.8 °C1 June 1983	-0.8 °C2 February 1983	16.1 °C	2,700 mm	0	7
1982	28.9 °C7 April 1982	1.8 °C6 February 1982	16.2 °C	2,634 mm	0	0
1981	28.1 °C22 July 1981	1.1 °C11 January 1981	16.1 °C	2,574 mm	0	0
1980	29.0 °C18 April 1980	0.4 °C7 February 1980	16.5 °C	2,555 mm	0	0
1979	29.7 °C6 June 1979	1.3 °C10 March 1979	17.0 °C	2,945 mm	0	0
1978	28.1 °C14 August 1978	-0.9 °C6 January 1978	16.3 °C	2,435 mm	0	3
1977	27.9 °C11 September 1977	-0.9 °C8 February 1977	16.3 °C	2,757 mm	0	3
1976	28.9 °C12 April 1976	-0.5 °C19 January 1976	16.4 °C	2,790 mm	0	1
1975	29.6 °C4 April 1975	0.3 °C15 January 1975	16.5 °C	3,481 mm	0	0
1974	27.7 °C14 August 1974	-0.1 °C7 February 1974	16.2 °C	2,686 mm	0	1
1973	32.3 °C15 April 1973	2.0 °C26 December 1973	16.9 °C	3,279 mm	3	0
1972	28.3 °C13 July 1972	-0.4 °C18 February 1972	16.5 °C	3,261 mm	0	1
1971	27.3 °C15 July 1971	0.5 °C1 February 1971	15.9 °C	3,201 mm	0	0
1970	28.0 °C21 August 1970	1.8 °C13 January 1970	16.3 °C	2,530 mm	0	0
1969	27.1 °C29 July 1969	0.4 °C30 January 1969	16.3 °C	2,481 mm	0	0
1968	27.6 °C21 April 1968	0.5 °C12 February 1968	15.8 °C	3,089 mm	0	0
1967	27.3 °C31 July 1967	0.1 °C3 January 1967	15.7 °C	2,857 mm	0	0
1966	31.2 °C2 May 1966	3.4 °C10 January 1966	16.2 °C	3,583 mm	1	0
1965	28.1 °C26 April 1965	2.0 °C10 January 1965	15.7 °C	2,725 mm	0	0
1964	30.9 °C7 June 1964	-2.5 °C31 January 1964	16.5 °C	3,196 mm	2	13
1963	27.6 °C25 June 1963	1.3 °C20 January 1963	16.2 °C	3,278 mm	0	0
1962	28.2 °C15 July 1962	0.7 °C18 January 1962	16.1 °C	3,818 mm	0	0
1961	29.8 °C24 April 1961	-0.6 °C25 December 1961	16.2 °C	3,073 mm	0	1
1960	32.3 °C2 May 1960	0.7 °C18 January 1960	16.8 °C	3,232 mm	18	0
1959	29.0 °C9 April 1959	1.4 °C30 December 1959	16.3 °C	2,967 mm	0	0
1958	28.2 °C2 June 1958	1.5 °C16 February 1958	16.7 °C	3,513 mm	0	0
1957	33.6 °C26 May 1957	1.5 °C13 January 1957	16.5 °C	2,939 mm	22	0
1956	29.5 °C19 April 1956	1.2 °C24 January 1956	16.1 °C	3,657 mm	0	0
1955	27.5 °C15 May 1955	0.8 °C2 January 1955	16.0 °C	3,378 mm	0	0
1954	28.4 °C19 April 1954	1.2 °C15 January 1954	16.0 °C	3,316 mm	0	0
1953	26.7 °C16 August 1953	-5.0 °C25 January 1953	15.4 °C	2,976 mm	0	6
1952	26.4 °C14 April 1952	0.4 °C24 February 1952	15.7 °C	3,321 mm	0	0
1951	26.9 °C5 September 1951	2.3 °C27 January 1951	15.9 °C	3,621 mm	0	0
1950	26.6 °C23 April 1950	1.9 °C17 January 1950	15.9 °C	3,749 mm	0	0
1949	25.5 °C21 September 1949	0.9 °C1 January 1949	15.7 °C	3,784 mm	0	0
1948	26.7 °C13 April 1948	0.8 °C8 February 1948	15.8 °C	2,706 mm	0	0
1947	28.2 °C17 May 1947	2.0 °C25 January 1947	16.2 °C	2,409 mm	0	0
1946	27.5 °C9 September 1946	3.0 °C2 January 1946	16.1 °C	2,574 mm	0	0
1945	27.9 °C9 April 1945	-0.5 °C10 February 1945	15.5 °C	3,181 mm	0	4
1944	26.7 °C18 August 1944	0.0 °C21 January 1944	15.8 °C	3,065 mm	0	0
1943	26.8 °C10 July 1943	0.7 °C1 February 1943	15.2 °C	3,048 mm	0	0
1942	26.4 °C26 April 1942	1.6 °C31 January 1942	15.6 °C	3,584 mm	0	0
1941	26.1 °C10 July 1941	0.7 °C31 January 1941	15.4 °C	3,071 mm	0	0
1940	26.2 °C7 July 1940	1.1 °C20 January 1940	15.4 °C	2,264 mm	0	0

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

22.6 °C

+1.4 °C

Hot days (≥ 30 °C)

0 d/yr

-1

Frost days (< 0 °C)

0 d/yr

-1

Annual rainfall

3122 mm

+26 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	16.8 °C	+2.0 °C	9 mm	-24 mm
Feb	17.0 °C	+0.2 °C	91 mm	+41 mm
Mar	21.3 °C	+0.5 °C	105 mm	+7 mm
Apr	23.8 °C	+0.3 °C	164 mm	+7 mm
May	24.4 °C	+0.2 °C	447 mm	+177 mm
Jun	26.3 °C	+1.8 °C	261 mm	-264 mm
Jul	26.6 °C	+2.8 °C	454 mm	-369 mm
Aug	25.4 °C	+1.3 °C	917 mm	+332 mm
Sep	25.8 °C	+2.1 °C	271 mm	-97 mm
Oct	23.9 °C	+1.6 °C	388 mm	+244 mm
Nov	21.6 °C	+2.4 °C	17 mm	-11 mm
Dec	17.9 °C	+1.6 °C	1 mm	-15 mm

The year's extremes

Hottest day

29.5 °C

23 Jul 2025

Coldest day

4.8 °C

14 Jan 2025

Wettest day

244.2 mm

13 Aug 2025

Windiest day

15.0 km/h

17 Mar 2025

Strongest gust

62.3 km/h

16 Mar 2025

Hottest feels-like

35.5 °C

24 Jul 2025

Coldest feels-like

2.6 °C

14 Jan 2025

Sunniest day

13.1 h

7 Jun 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 Ilām?

Ilām has a subtropical highland, dry winter climate (Köppen Cwb). Over 1940-2025, the average annual temperature is 16.5 °C and it receives 3,096 mm of precipitation per year.

What is the hottest day ever recorded in Ilām?

The hottest day measured in Ilām between 1940 and 2025 was 26 May 1957, reaching 33.6 °C.

What is the coldest day in Ilām?

The coldest day measured in Ilām between 1940 and 2025 was 25 January 1953, at -5.0 °C.

Does it snow in Ilām?

Almost never: Ilām sees virtually no snow, with about 1 frost days per year.

Has the climate of Ilām warmed?

Yes: Ilām warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Ilām?

The wettest day measured in Ilām between 1940 and 2025 was 2 September 1998, with 343 mm of rain in 24 hours.

What was the windiest day in Ilām?

The windiest day measured in Ilām between 1940 and 2025 was 11 April 1976, with winds reaching 17.3 km/h.

What is the warmest month in Ilām?

The warmest month in Ilām is July (21.2 °C on average); the coldest is January (9.1 °C).

How much does it rain in Ilām?

Ilām receives on average 3,096 mm of precipitation per year, spread over about 231 rainy days.

Is it sunny in Ilām?

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

What is the biggest single-day snowfall in Ilām?

The heaviest 24-hour snowfall measured in Ilām between 1940 and 2025 was 5 February 2022, with 6.8 cm.

Are there tropical nights in Ilām?

Yes: Ilām has on average 13 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Ilām?

In Ilām, between 1940 and 2025, the highest apparent temperature reached 36.0 °C on 4 August 2020, and the lowest was -8.5 °C on 25 January 1953.

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