Xam Nua climate — normals and trends

Q: What is the climate of Xam Nua?

Xam Nua has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 19.4 °C and it receives 1,637 mm of precipitation per year.

Q: What is the hottest day ever recorded in Xam Nua?

The hottest day measured in Xam Nua between 1940 and 2025 was 25 April 1958, reaching 35.6 °C.

Q: What is the coldest day in Xam Nua?

The coldest day measured in Xam Nua between 1940 and 2025 was 2 January 1974, at -2.0 °C.

Q: Does it snow in Xam Nua?

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

Q: Has the climate of Xam Nua warmed?

Yes: Xam Nua warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Xam Nua?

The wettest day measured in Xam Nua between 1940 and 2025 was 22 August 1959, with 164 mm of rain in 24 hours.

Q: What was the windiest day in Xam Nua?

The windiest day measured in Xam Nua between 1940 and 2025 was 6 June 1946, with winds reaching 25.4 km/h.

Q: What is the warmest month in Xam Nua?

The warmest month in Xam Nua is June (23.4 °C on average); the coldest is January (13.8 °C).

Q: How much does it rain in Xam Nua?

Xam Nua receives on average 1,637 mm of precipitation per year, spread over about 192 rainy days.

Q: Is it sunny in Xam Nua?

Xam Nua gets on average 8.1 hours of sunshine per day, roughly 2,957 hours per year over 1940-2025.

Climate normals · ERA5

Xam NuaHouaphan

coords: 20.42°, 104.05°
period: 1940–2025 · 86 yrs

CwaHumid subtropical, dry winterWarmest monthJuneColdest monthJanuaryWettest monthAugustDriest monthDecember

The normals for this period

The average of every indicator across the whole window: temperature, water, sky, wind and notable days.

Mean daily temperature

19.4°C

Average daily high

24.7°C

Average daily low

15.8°C

Annual rainfall

1,637mm

Sunshine / day

8.1h

Mean relative humidity

83%

Average peak wind

9.1km/h

Seasonal range

9.6°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

30 d/yr

Rainy days (≥ 1 mm)

192 d/yr

Annual snowfall

0.0 cm

Average feels-like high

26.7 °C

Average feels-like low

17.0 °C

Average peak gust

31.5 km/h

Tropical nights (≥ 20 °C)

73 d/yr

Solar radiation

15.6 MJ/m²

Has the climate changed?

What the yearly averages say about warming here, and whether the slope is statistically solid.

+1.5 °C

since 1940

+0.2 °C per decade · r² = 0.55 · 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).

Climate month by month

How an average year unfolds: when it rains, when it turns hot, when the sun is out.

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

The most extreme days ever measured here, then the year-by-year detail.

Hottest day

35.6 °C

25 April 1958

Coldest day

-2.0 °C

2 January 1974

Wettest day

164 mm

22 August 1959

Windiest day

25.4 km/h

6 June 1946

Strongest gust

91.8 km/h

23 August 1987

Hottest feels-like

39.4 °C

1 June 2023

Coldest feels-like

-5.4 °C

2 January 1974

Snowiest day

1.1 cm

24 January 2016

Sunniest day

13.1 h

13 June 2013

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	32.8 °C9 May 2025	2.6 °C13 January 2025	19.9 °C	1,878 mm	49	0
2024	34.1 °C27 April 2024	5.5 °C24 January 2024	20.9 °C	1,847 mm	75	0
2023	33.8 °C6 May 2023	3.5 °C30 January 2023	20.6 °C	1,432 mm	64	0
2022	32.1 °C25 July 2022	3.9 °C19 December 2022	20.0 °C	1,594 mm	32	0
2021	32.7 °C3 June 2021	3.5 °C2 January 2021	20.2 °C	1,469 mm	46	0
2020	33.2 °C22 May 2020	6.3 °C22 December 2020	20.4 °C	1,500 mm	71	0
2019	35.5 °C19 May 2019	1.8 °C10 December 2019	21.2 °C	1,368 mm	88	0
2018	32.4 °C9 May 2018	4.4 °C11 January 2018	20.2 °C	1,893 mm	35	0
2017	34.3 °C11 April 2017	3.7 °C21 December 2017	20.2 °C	1,627 mm	39	0
2016	33.4 °C11 April 2016	-0.5 °C24 January 2016	20.3 °C	1,491 mm	62	2
2015	34.0 °C6 May 2015	4.0 °C14 January 2015	20.7 °C	1,391 mm	73	0
2014	33.6 °C24 May 2014	1.0 °C23 January 2014	20.1 °C	1,468 mm	54	0
2013	33.0 °C16 May 2013	1.0 °C20 December 2013	19.7 °C	1,570 mm	45	0
2012	33.5 °C4 May 2012	5.4 °C31 December 2012	20.3 °C	1,522 mm	25	0
2011	31.8 °C26 July 2011	3.3 °C27 December 2011	18.8 °C	1,501 mm	14	0
2010	33.0 °C7 May 2010	4.6 °C19 February 2010	20.3 °C	1,670 mm	55	0
2009	31.9 °C24 April 2009	2.2 °C11 January 2009	20.1 °C	1,509 mm	34	0
2008	31.0 °C12 April 2008	2.8 °C3 January 2008	19.0 °C	1,985 mm	17	0
2007	34.9 °C2 April 2007	3.4 °C29 January 2007	19.8 °C	1,450 mm	30	0
2006	32.3 °C11 April 2006	2.0 °C23 December 2006	20.0 °C	1,387 mm	22	0
2005	32.7 °C12 March 2005	3.1 °C2 January 2005	19.8 °C	1,669 mm	29	0
2004	31.6 °C29 March 2004	4.1 °C25 January 2004	19.4 °C	1,537 mm	12	0
2003	33.8 °C7 May 2003	3.9 °C22 December 2003	20.1 °C	1,376 mm	40	0
2002	32.8 °C16 March 2002	5.1 °C5 January 2002	19.9 °C	1,747 mm	27	0
2001	33.9 °C10 April 2001	4.1 °C24 December 2001	19.7 °C	1,516 mm	17	0
2000	32.5 °C2 April 2000	4.4 °C28 January 2000	19.5 °C	1,490 mm	17	0
1999	32.5 °C27 March 1999	-0.9 °C27 December 1999	19.5 °C	1,402 mm	23	6
1998	32.3 °C15 June 1998	5.5 °C13 December 1998	20.5 °C	1,303 mm	34	0
1997	32.9 °C6 June 1997	6.3 °C25 January 1997	19.8 °C	1,704 mm	21	0
1996	32.0 °C7 May 1996	1.7 °C1 January 1996	19.3 °C	1,831 mm	12	0
1995	33.0 °C21 May 1995	2.0 °C31 December 1995	19.4 °C	1,551 mm	31	0
1994	32.4 °C3 May 1994	6.2 °C22 January 1994	19.7 °C	2,043 mm	14	0
1993	32.3 °C5 June 1993	1.6 °C31 January 1993	19.3 °C	1,462 mm	24	0
1992	33.1 °C8 May 1992	4.3 °C15 January 1992	19.2 °C	1,725 mm	35	0
1991	32.0 °C11 April 1991	4.1 °C28 December 1991	20.0 °C	1,485 mm	32	0
1990	33.9 °C22 April 1990	4.2 °C5 December 1990	19.6 °C	1,736 mm	24	0
1989	32.9 °C21 April 1989	4.1 °C14 January 1989	19.2 °C	1,761 mm	26	0
1988	33.1 °C25 May 1988	4.6 °C12 December 1988	19.6 °C	1,530 mm	40	0
1987	32.4 °C26 May 1987	1.5 °C8 December 1987	19.8 °C	1,691 mm	31	0
1986	32.1 °C21 March 1986	1.3 °C2 March 1986	19.3 °C	1,597 mm	28	0
1985	31.2 °C10 June 1985	2.4 °C25 December 1985	19.2 °C	1,620 mm	10	0
1984	33.5 °C5 April 1984	2.6 °C9 January 1984	19.4 °C	1,496 mm	24	0
1983	33.1 °C24 May 1983	2.2 °C24 January 1983	19.1 °C	1,721 mm	47	0
1982	32.7 °C12 May 1982	0.9 °C27 December 1982	19.5 °C	1,848 mm	33	0
1981	31.8 °C9 April 1981	3.7 °C12 January 1981	19.6 °C	1,943 mm	15	0
1980	33.3 °C24 April 1980	4.0 °C9 February 1980	19.6 °C	1,934 mm	31	0
1979	32.7 °C13 May 1979	4.9 °C19 November 1979	19.4 °C	1,488 mm	24	0
1978	31.0 °C13 June 1978	3.0 °C17 December 1978	19.1 °C	2,187 mm	14	0
1977	31.6 °C17 June 1977	4.6 °C17 February 1977	18.8 °C	1,737 mm	32	0
1976	31.2 °C18 June 1976	0.4 °C1 January 1976	18.8 °C	1,587 mm	13	0
1975	32.0 °C28 April 1975	-1.6 °C31 December 1975	18.9 °C	2,003 mm	12	4
1974	33.3 °C24 February 1974	-2.0 °C2 January 1974	19.0 °C	1,882 mm	20	3
1973	34.9 °C8 April 1973	-0.2 °C27 December 1973	19.7 °C	2,094 mm	60	2
1972	32.2 °C17 May 1972	2.9 °C10 February 1972	19.4 °C	1,748 mm	37	0
1971	31.6 °C24 April 1971	0.2 °C6 January 1971	18.4 °C	2,045 mm	16	0
1970	33.3 °C15 March 1970	4.6 °C31 January 1970	19.3 °C	1,777 mm	32	0
1969	34.0 °C14 May 1969	2.7 °C11 December 1969	19.5 °C	1,577 mm	56	0
1968	31.9 °C2 July 1968	4.8 °C14 February 1968	19.4 °C	1,787 mm	28	0
1967	33.3 °C30 March 1967	0.2 °C18 January 1967	18.9 °C	1,560 mm	40	0
1966	32.1 °C29 April 1966	2.7 °C3 December 1966	19.5 °C	1,728 mm	19	0
1965	33.3 °C1 April 1965	3.7 °C18 December 1965	19.1 °C	1,662 mm	27	0
1964	30.3 °C19 May 1964	0.9 °C19 December 1964	19.0 °C	1,848 mm	4	0
1963	31.1 °C30 April 1963	0.9 °C16 January 1963	18.9 °C	1,805 mm	19	0
1962	32.5 °C8 May 1962	2.6 °C27 January 1962	18.9 °C	1,449 mm	22	0
1961	32.8 °C25 March 1961	-0.8 °C18 January 1961	19.4 °C	1,598 mm	24	2
1960	35.4 °C28 April 1960	1.8 °C2 January 1960	19.6 °C	1,559 mm	35	0
1959	33.8 °C11 April 1959	3.4 °C11 January 1959	19.5 °C	1,667 mm	26	0
1958	35.6 °C25 April 1958	2.9 °C14 December 1958	19.2 °C	1,440 mm	60	0
1957	34.9 °C14 May 1957	2.0 °C13 February 1957	19.8 °C	1,507 mm	57	0
1956	34.1 °C19 April 1956	0.4 °C10 January 1956	18.8 °C	1,752 mm	29	0
1955	34.4 °C18 April 1955	-1.8 °C12 January 1955	18.7 °C	1,619 mm	28	2
1954	33.9 °C18 April 1954	0.8 °C17 December 1954	19.6 °C	1,173 mm	32	0
1953	31.4 °C21 May 1953	2.5 °C13 December 1953	19.3 °C	1,634 mm	13	0
1952	32.0 °C23 April 1952	3.2 °C10 December 1952	19.6 °C	1,653 mm	31	0
1951	32.8 °C10 April 1951	5.3 °C14 January 1951	19.2 °C	1,763 mm	10	0
1950	34.0 °C23 April 1950	5.2 °C7 January 1950	19.2 °C	1,571 mm	19	0
1949	33.4 °C14 June 1949	2.5 °C17 January 1949	19.4 °C	1,745 mm	23	0
1948	33.1 °C14 March 1948	0.8 °C4 January 1948	18.8 °C	1,505 mm	14	0
1947	32.0 °C7 May 1947	1.1 °C31 December 1947	18.8 °C	1,430 mm	7	0
1946	34.8 °C19 March 1946	1.2 °C11 January 1946	19.2 °C	1,212 mm	35	0
1945	30.3 °C28 May 1945	2.2 °C18 January 1945	18.1 °C	1,444 mm	2	0
1944	31.7 °C9 April 1944	-0.3 °C21 December 1944	18.7 °C	1,651 mm	12	1
1943	32.8 °C24 March 1943	3.8 °C13 December 1943	18.5 °C	1,678 mm	13	0
1942	32.8 °C17 April 1942	2.6 °C7 December 1942	18.6 °C	1,811 mm	14	0
1941	32.3 °C24 March 1941	4.5 °C3 February 1941	19.0 °C	1,662 mm	15	0
1940	31.5 °C9 March 1940	1.1 °C25 January 1940	18.5 °C	1,508 mm	9	0

Normals computed over complete calendar years 1940–2025.

A specific year

Pick a year and compare it with the normal: warmer, drier, more extreme?

Year

Across the whole year

Average daily high

25.0 °C

+0.3 °C

Hot days (≥ 30 °C)

49 d/yr

+19

Frost days (< 0 °C)

0 d/yr

0

Annual rainfall

1878 mm

+241 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	20.0 °C	+0.1 °C	7 mm	-15 mm
Feb	21.9 °C	-0.5 °C	22 mm	-4 mm
Mar	25.6 °C	+0.2 °C	20 mm	-54 mm
Apr	27.4 °C	+0.2 °C	127 mm	-8 mm
May	28.0 °C	0.0 °C	178 mm	-30 mm
Jun	28.6 °C	+0.7 °C	222 mm	-2 mm
Jul	27.2 °C	-0.3 °C	512 mm	+258 mm
Aug	27.6 °C	+0.7 °C	318 mm	+16 mm
Sep	27.6 °C	+1.6 °C	331 mm	+107 mm
Oct	24.7 °C	+0.8 °C	73 mm	-43 mm
Nov	20.3 °C	-1.3 °C	44 mm	+7 mm
Dec	20.9 °C	+1.5 °C	24 mm	+8 mm

The year's extremes

Hottest day

32.8 °C

9 May 2025

Coldest day

2.6 °C

13 Jan 2025

Wettest day

131.1 mm

22 Jul 2025

Windiest day

21.8 km/h

1 Jun 2025

Strongest gust

90.0 km/h

26 Aug 2025

Hottest feels-like

38.5 °C

7 Jun 2025

Coldest feels-like

0.2 °C

13 Jan 2025

Sunniest day

12.3 h

2 Jun 2025

What was the weather like that day?

The weather actually measured on a given date, anywhere in the covered window.

Date

Climate at a glance

What these normals say about the place, in a few sentences, and the notions needed to read them.

Xam Nua (Laos) has a humid subtropical, dry winter climate (Cwa) under the Köppen-Geiger classification. Its mean annual temperature is 19.4 °C and it receives 1,637 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 June (23.4 °C on average) and the coldest is January (13.8 °C). Rainfall peaks in August.

Xam Nua averages 0 frost days, 30 hot days (≥ 30 °C) and 192 rainy days per year.

Xam Nua has warmed by +1.5 °C between 1940 and 2025, or +0.17 °C per decade. This trend is statistically significant.

The hottest day of the period reached 35.6 °C (on 25 April 1958) and the coldest -2.0 °C (on 2 January 1974).

Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.

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Frequently asked questions

What is the climate of Xam Nua?

Xam Nua has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 19.4 °C and it receives 1,637 mm of precipitation per year.

What is the hottest day ever recorded in Xam Nua?

The hottest day measured in Xam Nua between 1940 and 2025 was 25 April 1958, reaching 35.6 °C.

What is the coldest day in Xam Nua?

The coldest day measured in Xam Nua between 1940 and 2025 was 2 January 1974, at -2.0 °C.

Does it snow in Xam Nua?

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

Has the climate of Xam Nua warmed?

Yes: Xam Nua warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Xam Nua?

The wettest day measured in Xam Nua between 1940 and 2025 was 22 August 1959, with 164 mm of rain in 24 hours.

What was the windiest day in Xam Nua?

The windiest day measured in Xam Nua between 1940 and 2025 was 6 June 1946, with winds reaching 25.4 km/h.

What is the warmest month in Xam Nua?

The warmest month in Xam Nua is June (23.4 °C on average); the coldest is January (13.8 °C).

How much does it rain in Xam Nua?

Xam Nua receives on average 1,637 mm of precipitation per year, spread over about 192 rainy days.

Is it sunny in Xam Nua?

Xam Nua gets on average 8.1 hours of sunshine per day, roughly 2,957 hours per year over 1940-2025.

What is the biggest single-day snowfall in Xam Nua?

The heaviest 24-hour snowfall measured in Xam Nua between 1940 and 2025 was 24 January 2016, with 1.1 cm.

Are there tropical nights in Xam Nua?

Yes: Xam Nua has on average 73 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Xam Nua?

In Xam Nua, between 1940 and 2025, the highest apparent temperature reached 39.4 °C on 1 June 2023, and the lowest was -5.4 °C on 2 January 1974.

These forecasts and records come from our own weather API. Developer documentation →