Ít Ong climate — normals and trends

Q: What is the climate of Ít Ong?

Ít Ong has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 20.9 °C and it receives 1,686 mm of precipitation per year.

Q: What is the hottest day ever recorded in Ít Ong?

The hottest day measured in Ít Ong between 1940 and 2025 was 25 April 1958, reaching 37.2 °C.

Q: What is the coldest day in Ít Ong?

The coldest day measured in Ít Ong between 1940 and 2025 was 31 December 1975, at -0.6 °C.

Q: Does it snow in Ít Ong?

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

Q: Has the climate of Ít Ong warmed?

Yes: Ít Ong warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Ít Ong?

The wettest day measured in Ít Ong between 1940 and 2025 was 16 August 1996, with 321 mm of rain in 24 hours.

Q: What was the windiest day in Ít Ong?

The windiest day measured in Ít Ong between 1940 and 2025 was 31 March 1967, with winds reaching 21.3 km/h.

Q: What is the warmest month in Ít Ong?

The warmest month in Ít Ong is May (24.3 °C on average); the coldest is January (15.1 °C).

Q: How much does it rain in Ít Ong?

Ít Ong receives on average 1,686 mm of precipitation per year, spread over about 160 rainy days.

Q: Is it sunny in Ít Ong?

Ít Ong gets on average 8.4 hours of sunshine per day, roughly 3,066 hours per year over 1940-2025.

Ít Ong (Vietnam) has a humid subtropical, dry winter climate (Cwa) under the Köppen-Geiger classification. Its mean annual temperature is 20.9 °C and it receives 1,686 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 (24.3 °C on average) and the coldest is January (15.1 °C). Rainfall peaks in August.

Ít Ong averages 0 frost days, 40 hot days (≥ 30 °C) and 160 rainy days per year.

Ít Ong has warmed by +1.8 °C between 1940 and 2025, or +0.21 °C per decade. This trend is statistically significant.

The hottest day of the period reached 37.2 °C (on 25 April 1958) and the coldest -0.6 °C (on 31 December 1975).

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

Ít OngSơn La Province

coords: 21.52°, 104.03°
period: 1940–2025 · 86 yrs

CwaHumid subtropical, dry winterWarmest monthMayColdest monthJanuaryWettest monthAugustDriest monthDecember

Mean daily temperature

20.9°C

Average daily high

25.4°C

Average daily low

17.4°C

Annual rainfall

1,686mm

Sunshine / day

8.4h

Mean relative humidity

79%

Average peak wind

7.3km/h

Seasonal range

9.2°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

40 d/yr

Rainy days (≥ 1 mm)

160 d/yr

Annual snowfall

0.0 cm

Average feels-like high

27.7 °C

Average feels-like low

19.0 °C

Average peak gust

28.3 km/h

Tropical nights (≥ 20 °C)

143 d/yr

Solar radiation

14.9 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.8 °C

since 1940

+0.2 °C per decade · r² = 0.63 · 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

37.2 °C

25 April 1958

Coldest day

-0.6 °C

31 December 1975

Wettest day

321 mm

16 August 1996

Windiest day

21.3 km/h

31 March 1967

Strongest gust

85.3 km/h

9 July 1956

Hottest feels-like

40.5 °C

1 June 2023

Coldest feels-like

-3.5 °C

31 December 1975

Sunniest day

13.2 h

13 June 2013

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	34.9 °C9 May 2025	5.6 °C12 January 2025	21.6 °C	1,687 mm	75	0
2024	36.8 °C27 April 2024	7.9 °C24 January 2024	22.6 °C	2,227 mm	84	0
2023	36.8 °C30 May 2023	5.5 °C30 January 2023	22.4 °C	1,414 mm	95	0
2022	33.1 °C25 July 2022	5.9 °C19 December 2022	21.4 °C	1,671 mm	54	0
2021	34.3 °C22 May 2021	6.0 °C12 January 2021	21.6 °C	1,191 mm	81	0
2020	34.9 °C22 May 2020	7.9 °C22 December 2020	21.8 °C	1,097 mm	73	0
2019	37.2 °C19 May 2019	3.8 °C8 December 2019	22.7 °C	1,423 mm	101	0
2018	33.1 °C9 May 2018	7.1 °C5 February 2018	21.6 °C	2,056 mm	56	0
2017	34.5 °C6 June 2017	4.5 °C21 December 2017	21.6 °C	1,747 mm	55	0
2016	33.2 °C28 June 2016	3.1 °C25 January 2016	21.8 °C	1,487 mm	78	0
2015	36.6 °C6 May 2015	6.5 °C14 January 2015	22.1 °C	1,481 mm	83	0
2014	34.5 °C24 May 2014	2.9 °C23 January 2014	21.6 °C	1,545 mm	79	0
2013	33.6 °C16 May 2013	4.3 °C20 December 2013	21.3 °C	1,710 mm	68	0
2012	35.3 °C4 May 2012	7.9 °C25 January 2012	21.7 °C	1,791 mm	57	0
2011	32.1 °C26 July 2011	5.9 °C27 December 2011	20.4 °C	1,394 mm	29	0
2010	34.9 °C13 April 2010	7.5 °C19 February 2010	22.0 °C	1,365 mm	81	0
2009	33.5 °C24 April 2009	5.4 °C11 January 2009	21.8 °C	1,371 mm	72	0
2008	32.0 °C23 September 2008	5.2 °C1 December 2008	20.6 °C	1,861 mm	32	0
2007	36.9 °C2 April 2007	4.7 °C29 January 2007	21.5 °C	1,033 mm	56	0
2006	33.4 °C11 April 2006	4.3 °C23 December 2006	21.6 °C	1,394 mm	39	0
2005	33.5 °C1 May 2005	5.1 °C20 December 2005	21.3 °C	1,451 mm	56	0
2004	33.1 °C3 May 2004	5.9 °C9 February 2004	21.0 °C	1,577 mm	29	0
2003	35.2 °C8 May 2003	6.9 °C21 December 2003	21.7 °C	1,388 mm	53	0
2002	33.5 °C2 May 2002	7.7 °C5 January 2002	21.4 °C	1,990 mm	46	0
2001	33.5 °C10 April 2001	5.8 °C24 December 2001	21.2 °C	1,587 mm	32	0
2000	32.3 °C25 April 2000	6.0 °C2 February 2000	21.2 °C	1,316 mm	39	0
1999	32.0 °C10 March 1999	0.5 °C27 December 1999	21.1 °C	1,269 mm	23	0
1998	34.3 °C15 May 1998	8.0 °C13 December 1998	22.0 °C	1,402 mm	55	0
1997	33.9 °C4 June 1997	8.5 °C12 January 1997	21.4 °C	1,665 mm	33	0
1996	32.1 °C17 March 1996	2.6 °C1 January 1996	20.7 °C	2,113 mm	21	0
1995	33.4 °C19 April 1995	2.8 °C31 December 1995	20.8 °C	1,823 mm	32	0
1994	34.0 °C2 May 1994	8.2 °C1 January 1994	21.2 °C	2,685 mm	26	0
1993	32.6 °C5 April 1993	2.9 °C28 December 1993	20.6 °C	1,464 mm	18	0
1992	33.9 °C8 May 1992	6.0 °C11 November 1992	20.7 °C	2,096 mm	54	0
1991	32.5 °C24 March 1991	7.5 °C29 December 1991	21.4 °C	2,222 mm	41	0
1990	33.4 °C22 April 1990	7.0 °C6 December 1990	20.8 °C	1,578 mm	33	0
1989	33.3 °C21 April 1989	7.0 °C14 January 1989	20.6 °C	1,924 mm	30	0
1988	34.4 °C13 June 1988	7.6 °C13 December 1988	21.1 °C	1,226 mm	52	0
1987	33.0 °C13 May 1987	4.8 °C8 December 1987	21.4 °C	1,429 mm	41	0
1986	32.5 °C15 March 1986	3.3 °C11 January 1986	20.8 °C	1,606 mm	36	0
1985	33.6 °C7 May 1985	3.8 °C25 December 1985	20.3 °C	1,902 mm	16	0
1984	34.3 °C21 April 1984	5.0 °C9 January 1984	20.6 °C	1,823 mm	33	0
1983	34.3 °C24 May 1983	3.9 °C2 December 1983	20.6 °C	1,616 mm	61	0
1982	32.2 °C12 May 1982	2.3 °C28 December 1982	20.9 °C	2,092 mm	34	0
1981	32.3 °C24 February 1981	5.7 °C12 January 1981	21.0 °C	2,654 mm	34	0
1980	35.2 °C3 May 1980	6.2 °C9 February 1980	21.2 °C	1,932 mm	42	0
1979	33.0 °C13 May 1979	7.1 °C29 November 1979	20.9 °C	1,467 mm	22	0
1978	32.2 °C9 May 1978	5.8 °C17 December 1978	20.5 °C	2,476 mm	21	0
1977	33.0 °C23 August 1977	7.3 °C2 February 1977	20.2 °C	1,904 mm	32	0
1976	30.9 °C20 May 1976	1.4 °C1 January 1976	20.0 °C	1,712 mm	13	0
1975	33.7 °C28 April 1975	-0.6 °C31 December 1975	20.3 °C	1,886 mm	23	1
1974	33.6 °C24 February 1974	0.3 °C2 January 1974	20.3 °C	1,874 mm	21	0
1973	36.3 °C9 April 1973	1.6 °C31 December 1973	21.2 °C	1,957 mm	42	0
1972	33.7 °C12 May 1972	5.5 °C10 February 1972	20.7 °C	2,387 mm	41	0
1971	33.6 °C31 March 1971	2.0 °C6 January 1971	20.0 °C	1,858 mm	24	0
1970	34.3 °C12 May 1970	6.7 °C31 January 1970	20.6 °C	1,817 mm	39	0
1969	35.4 °C14 May 1969	5.2 °C30 November 1969	20.9 °C	1,698 mm	54	0
1968	31.8 °C29 March 1968	6.3 °C8 February 1968	20.6 °C	1,823 mm	24	0
1967	35.0 °C31 March 1967	2.9 °C18 January 1967	20.5 °C	1,556 mm	42	0
1966	32.8 °C29 April 1966	5.2 °C1 January 1966	20.5 °C	1,859 mm	18	0
1965	33.6 °C3 April 1965	5.5 °C17 January 1965	20.1 °C	1,532 mm	20	0
1964	32.3 °C26 May 1964	3.6 °C19 December 1964	20.3 °C	1,798 mm	20	0
1963	32.1 °C30 April 1963	3.5 °C16 January 1963	20.5 °C	1,699 mm	49	0
1962	33.6 °C21 March 1962	5.1 °C6 December 1962	20.5 °C	1,424 mm	38	0
1961	33.6 °C16 May 1961	1.7 °C18 January 1961	20.8 °C	2,180 mm	27	0
1960	35.9 °C27 April 1960	4.1 °C2 January 1960	21.1 °C	1,905 mm	48	0
1959	35.5 °C21 May 1959	6.3 °C11 January 1959	21.0 °C	1,467 mm	38	0
1958	37.2 °C25 April 1958	4.8 °C14 December 1958	20.9 °C	1,995 mm	73	0
1957	36.1 °C24 May 1957	4.8 °C13 February 1957	21.2 °C	1,689 mm	61	0
1956	35.4 °C19 April 1956	4.2 °C10 January 1956	20.4 °C	1,551 mm	27	0
1955	34.5 °C18 April 1955	1.7 °C12 January 1955	20.2 °C	1,387 mm	28	0
1954	34.6 °C17 April 1954	3.7 °C17 December 1954	20.7 °C	1,005 mm	28	0
1953	31.8 °C21 May 1953	5.8 °C13 December 1953	20.5 °C	994 mm	20	0
1952	32.6 °C10 April 1952	5.3 °C13 December 1952	20.8 °C	1,932 mm	22	0
1951	32.7 °C10 April 1951	7.9 °C14 January 1951	20.2 °C	1,943 mm	8	0
1950	33.2 °C22 April 1950	7.1 °C7 January 1950	20.3 °C	1,822 mm	21	0
1949	33.6 °C7 June 1949	5.2 °C17 January 1949	20.8 °C	1,473 mm	25	0
1948	33.8 °C15 March 1948	2.9 °C4 January 1948	20.1 °C	1,495 mm	13	0
1947	33.3 °C7 May 1947	3.9 °C31 December 1947	20.0 °C	1,168 mm	7	0
1946	34.2 °C19 March 1946	3.6 °C11 January 1946	20.3 °C	1,410 mm	30	0
1945	31.3 °C19 April 1945	5.1 °C18 January 1945	19.4 °C	1,470 mm	3	0
1944	33.1 °C9 April 1944	2.8 °C21 December 1944	20.0 °C	1,746 mm	14	0
1943	33.5 °C24 March 1943	5.9 °C22 November 1943	19.8 °C	1,798 mm	17	0
1942	34.8 °C17 April 1942	4.7 °C7 December 1942	19.9 °C	2,168 mm	17	0
1941	33.2 °C24 March 1941	5.7 °C4 February 1941	20.4 °C	1,557 mm	22	0
1940	29.8 °C27 April 1940	4.7 °C1 January 1940	19.8 °C	1,363 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

26.1 °C

+0.7 °C

Hot days (≥ 30 °C)

75 d/yr

+35

Frost days (< 0 °C)

0 d/yr

Annual rainfall

1687 mm

+1 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	21.0 °C	+0.9 °C	2 mm	-20 mm
Feb	22.3 °C	+0.1 °C	6 mm	-14 mm
Mar	26.4 °C	+0.6 °C	12 mm	-16 mm
Apr	28.9 °C	+0.9 °C	13 mm	-29 mm
May	29.3 °C	+0.6 °C	105 mm	-13 mm
Jun	28.6 °C	+0.9 °C	195 mm	-91 mm
Jul	28.2 °C	+0.8 °C	571 mm	+214 mm
Aug	28.3 °C	+0.9 °C	333 mm	-89 mm
Sep	28.6 °C	+1.2 °C	270 mm	+5 mm
Oct	27.0 °C	+1.2 °C	128 mm	+46 mm
Nov	22.9 °C	-0.5 °C	32 mm	+4 mm
Dec	21.9 °C	+1.4 °C	19 mm	+3 mm

The year's extremes

Hottest day

34.9 °C

9 May 2025

Coldest day

5.6 °C

12 Jan 2025

Wettest day

76.5 mm

7 Oct 2025

Windiest day

13.8 km/h

27 Mar 2025

Strongest gust

66.2 km/h

29 Sep 2025

Hottest feels-like

39.0 °C

9 May 2025

Coldest feels-like

3.7 °C

12 Jan 2025

Sunniest day

12.4 h

17 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 Ít Ong?

Ít Ong has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 20.9 °C and it receives 1,686 mm of precipitation per year.

What is the hottest day ever recorded in Ít Ong?

The hottest day measured in Ít Ong between 1940 and 2025 was 25 April 1958, reaching 37.2 °C.

What is the coldest day in Ít Ong?

The coldest day measured in Ít Ong between 1940 and 2025 was 31 December 1975, at -0.6 °C.

Does it snow in Ít Ong?

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

Has the climate of Ít Ong warmed?

Yes: Ít Ong warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Ít Ong?

The wettest day measured in Ít Ong between 1940 and 2025 was 16 August 1996, with 321 mm of rain in 24 hours.

What was the windiest day in Ít Ong?

The windiest day measured in Ít Ong between 1940 and 2025 was 31 March 1967, with winds reaching 21.3 km/h.

What is the warmest month in Ít Ong?

The warmest month in Ít Ong is May (24.3 °C on average); the coldest is January (15.1 °C).

How much does it rain in Ít Ong?

Ít Ong receives on average 1,686 mm of precipitation per year, spread over about 160 rainy days.

Is it sunny in Ít Ong?

Ít Ong gets on average 8.4 hours of sunshine per day, roughly 3,066 hours per year over 1940-2025.

Are there tropical nights in Ít Ong?

Yes: Ít Ong has on average 143 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Ít Ong?

In Ít Ong, between 1940 and 2025, the highest apparent temperature reached 40.5 °C on 1 June 2023, and the lowest was -3.5 °C on 31 December 1975.

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