Reforma climate — normals and trends

Q: What is the climate of Reforma?

Reforma has a tropical monsoon climate (Köppen Am). Over 1940-2025, the average annual temperature is 25.6 °C and it receives 1,625 mm of precipitation per year.

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

The hottest day measured in Reforma between 1940 and 2025 was 17 May 2024, reaching 42.8 °C.

Q: What is the coldest day in Reforma?

The coldest day measured in Reforma between 1940 and 2025 was 27 December 1989, at 10.4 °C.

Q: Does it snow in Reforma?

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

Q: Has the climate of Reforma warmed?

Yes: Reforma warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Reforma?

The wettest day measured in Reforma between 1940 and 2025 was 21 August 1973, with 304 mm of rain in 24 hours.

Q: What was the windiest day in Reforma?

The windiest day measured in Reforma between 1940 and 2025 was 21 August 1973, with winds reaching 44.3 km/h.

Q: What is the warmest month in Reforma?

The warmest month in Reforma is May (28.8 °C on average); the coldest is January (22.0 °C).

Q: How much does it rain in Reforma?

Reforma receives on average 1,625 mm of precipitation per year, spread over about 184 rainy days.

Q: Is it sunny in Reforma?

Reforma gets on average 9.9 hours of sunshine per day, roughly 3,614 hours per year over 1940-2025.

Reforma (Mexico) has a tropical monsoon climate (Am) under the Köppen-Geiger classification. Its mean annual temperature is 25.6 °C and it receives 1,625 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 (28.8 °C on average) and the coldest is January (22.0 °C). Rainfall peaks in September.

Reforma averages 0 frost days, 203 hot days (≥ 30 °C) and 184 rainy days per year.

Reforma has warmed by +2.1 °C between 1940 and 2025, or +0.24 °C per decade. This trend is statistically significant.

The hottest day of the period reached 42.8 °C (on 17 May 2024) and the coldest 10.4 °C (on 27 December 1989).

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

ReformaChiapas

coords: 17.86°, -93.15°
period: 1940–2025 · 86 yrs

AmTropical monsoonWarmest monthMayColdest monthJanuaryWettest monthSeptemberDriest monthMarch

Mean daily temperature

25.6°C

Average daily high

30.3°C

Average daily low

22.0°C

Annual rainfall

1,625mm

Sunshine / day

9.9h

Mean relative humidity

81%

Average peak wind

12.5km/h

Seasonal range

6.8°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

203 d/yr

Rainy days (≥ 1 mm)

184 d/yr

Annual snowfall

0.0 cm

Average feels-like high

35.0 °C

Average feels-like low

25.5 °C

Average peak gust

27.6 km/h

Tropical nights (≥ 20 °C)

285 d/yr

Solar radiation

18.0 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.1 °C

since 1940

+0.2 °C per decade · r² = 0.71 · 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

42.8 °C

17 May 2024

Coldest day

10.4 °C

27 December 1989

Wettest day

304 mm

21 August 1973

Windiest day

44.3 km/h

21 August 1973

Strongest gust

115.6 km/h

21 August 1973

Hottest feels-like

49.4 °C

27 May 2024

Coldest feels-like

9.5 °C

27 December 1989

Sunniest day

12.8 h

5 July 2025

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	40.5 °C7 May 2025	15.2 °C23 January 2025	27.2 °C	1,388 mm	266
2024	42.8 °C17 May 2024	12.9 °C8 February 2024	27.6 °C	1,365 mm	260
2023	39.3 °C15 June 2023	14.5 °C16 January 2023	26.9 °C	1,368 mm	258
2022	39.0 °C21 May 2022	13.4 °C31 January 2022	26.1 °C	2,067 mm	216
2021	38.5 °C4 May 2021	13.2 °C4 February 2021	26.7 °C	1,223 mm	238
2020	40.7 °C23 April 2020	14.8 °C27 December 2020	26.9 °C	1,953 mm	242
2019	40.3 °C9 May 2019	13.4 °C22 January 2019	26.7 °C	1,458 mm	247
2018	39.6 °C25 July 2018	13.3 °C8 January 2018	26.7 °C	1,255 mm	266
2017	40.2 °C29 April 2017	13.1 °C24 January 2017	26.5 °C	1,399 mm	240
2016	39.4 °C29 April 2016	10.9 °C25 January 2016	26.6 °C	1,363 mm	241
2015	40.1 °C26 April 2015	12.9 °C29 January 2015	26.8 °C	1,729 mm	249
2014	39.1 °C1 August 2014	13.0 °C17 January 2014	26.1 °C	1,637 mm	214
2013	39.7 °C18 April 2013	13.1 °C4 March 2013	26.3 °C	2,135 mm	245
2012	38.3 °C11 May 2012	14.0 °C23 December 2012	26.3 °C	1,342 mm	259
2011	39.4 °C26 April 2011	13.5 °C29 November 2011	26.3 °C	1,928 mm	226
2010	42.1 °C2 June 2010	11.9 °C16 December 2010	26.0 °C	1,906 mm	218
2009	39.6 °C5 April 2009	13.1 °C22 January 2009	26.6 °C	1,541 mm	253
2008	39.3 °C11 April 2008	13.0 °C14 December 2008	26.0 °C	1,736 mm	221
2007	39.8 °C5 July 2007	14.6 °C20 February 2007	26.7 °C	1,672 mm	231
2006	39.4 °C10 May 2006	11.4 °C28 December 2006	26.1 °C	1,777 mm	234
2005	41.7 °C12 June 2005	13.8 °C24 November 2005	26.3 °C	1,473 mm	222
2004	38.1 °C3 July 2004	14.5 °C20 February 2004	26.0 °C	1,356 mm	238
2003	41.3 °C25 April 2003	15.2 °C1 April 2003	26.2 °C	1,427 mm	226
2002	37.6 °C2 May 2002	13.2 °C10 January 2002	25.9 °C	1,606 mm	225
2001	38.7 °C11 April 2001	13.0 °C24 January 2001	26.0 °C	1,545 mm	205
2000	38.6 °C29 March 2000	14.2 °C21 December 2000	26.0 °C	1,596 mm	225
1999	40.6 °C4 May 1999	13.8 °C13 January 1999	26.0 °C	1,660 mm	217
1998	41.7 °C5 June 1998	12.7 °C4 February 1998	26.8 °C	1,351 mm	241
1997	39.3 °C10 August 1997	13.4 °C16 December 1997	26.3 °C	1,648 mm	229
1996	37.0 °C14 April 1996	11.9 °C15 January 1996	25.8 °C	1,693 mm	225
1995	39.7 °C6 June 1995	14.5 °C16 January 1995	26.4 °C	1,889 mm	207
1994	38.6 °C16 June 1994	14.0 °C6 January 1994	26.5 °C	1,260 mm	248
1993	39.7 °C14 April 1993	15.2 °C29 January 1993	26.2 °C	1,461 mm	218
1992	36.9 °C5 June 1992	15.3 °C7 February 1992	26.0 °C	1,730 mm	233
1991	39.3 °C22 April 1991	13.6 °C6 March 1991	26.3 °C	1,506 mm	222
1990	37.7 °C28 May 1990	14.7 °C12 December 1990	25.9 °C	1,561 mm	214
1989	37.8 °C8 June 1989	10.4 °C27 December 1989	25.4 °C	1,558 mm	191
1988	39.6 °C22 April 1988	14.7 °C27 January 1988	25.4 °C	1,910 mm	203
1987	39.1 °C3 May 1987	11.3 °C7 March 1987	25.2 °C	1,543 mm	204
1986	37.3 °C1 August 1986	11.6 °C29 January 1986	25.9 °C	1,273 mm	242
1985	38.8 °C14 May 1985	14.1 °C7 January 1985	25.6 °C	1,480 mm	211
1984	40.6 °C3 May 1984	13.2 °C2 January 1984	25.3 °C	1,792 mm	196
1983	38.7 °C21 May 1983	14.0 °C14 February 1983	25.6 °C	1,495 mm	225
1982	36.6 °C17 April 1982	12.9 °C15 January 1982	25.7 °C	1,656 mm	214
1981	38.6 °C18 May 1981	12.2 °C14 January 1981	25.0 °C	1,677 mm	192
1980	39.9 °C16 May 1980	13.6 °C4 March 1980	25.3 °C	1,951 mm	195
1979	37.0 °C9 May 1979	13.8 °C20 December 1979	25.1 °C	1,768 mm	172
1978	40.3 °C7 May 1978	13.1 °C7 February 1978	25.3 °C	1,847 mm	216
1977	37.4 °C29 March 1977	12.7 °C21 January 1977	25.4 °C	1,532 mm	227
1976	36.7 °C16 May 1976	12.4 °C3 February 1976	24.9 °C	1,847 mm	199
1975	40.6 °C6 May 1975	13.0 °C26 February 1975	25.9 °C	1,608 mm	202
1974	38.8 °C10 May 1974	13.9 °C14 February 1974	25.2 °C	1,490 mm	157
1973	38.3 °C20 April 1973	11.6 °C23 December 1973	25.3 °C	2,114 mm	188
1972	38.3 °C15 April 1972	13.8 °C23 December 1972	25.6 °C	1,725 mm	204
1971	39.4 °C27 April 1971	12.0 °C15 February 1971	25.6 °C	1,339 mm	200
1970	37.2 °C30 April 1970	11.1 °C5 February 1970	24.8 °C	1,705 mm	162
1969	39.4 °C5 May 1969	16.1 °C14 December 1969	25.4 °C	1,693 mm	171
1968	35.7 °C24 May 1968	11.7 °C15 March 1968	24.8 °C	1,532 mm	175
1967	37.7 °C31 May 1967	13.4 °C11 January 1967	25.0 °C	1,587 mm	162
1966	35.1 °C19 May 1966	12.9 °C21 December 1966	24.4 °C	1,619 mm	159
1965	38.3 °C26 April 1965	11.5 °C20 January 1965	25.1 °C	1,411 mm	181
1964	39.6 °C1 May 1964	13.9 °C15 January 1964	24.8 °C	1,624 mm	148
1963	38.1 °C30 April 1963	10.7 °C26 December 1963	24.9 °C	1,742 mm	168
1962	39.0 °C4 June 1962	13.4 °C12 January 1962	25.0 °C	1,336 mm	185
1961	40.0 °C26 May 1961	14.2 °C27 December 1961	25.0 °C	1,694 mm	168
1960	40.9 °C30 April 1960	10.6 °C31 January 1960	25.1 °C	1,349 mm	186
1959	36.3 °C20 May 1959	15.5 °C3 April 1959	24.8 °C	1,869 mm	174
1958	39.9 °C9 May 1958	12.8 °C10 January 1958	25.0 °C	1,708 mm	174
1957	39.7 °C23 May 1957	13.0 °C11 December 1957	25.3 °C	1,544 mm	176
1956	37.7 °C9 April 1956	13.1 °C15 January 1956	24.6 °C	1,816 mm	144
1955	40.6 °C20 May 1955	14.0 °C31 January 1955	25.1 °C	1,713 mm	158
1954	34.4 °C31 March 1954	11.2 °C10 February 1954	24.1 °C	1,767 mm	105
1953	40.2 °C18 April 1953	12.7 °C11 January 1953	25.6 °C	1,545 mm	198
1952	37.9 °C18 March 1952	13.9 °C31 January 1952	24.8 °C	1,694 mm	157
1951	39.6 °C17 June 1951	12.4 °C5 February 1951	25.7 °C	1,640 mm	217
1950	38.7 °C16 May 1950	14.3 °C12 December 1950	25.1 °C	1,574 mm	157
1949	39.1 °C1 May 1949	14.7 °C20 November 1949	25.8 °C	1,379 mm	205
1948	36.8 °C3 May 1948	11.5 °C16 January 1948	24.9 °C	2,025 mm	156
1947	37.6 °C4 April 1947	12.7 °C16 February 1947	24.9 °C	1,957 mm	145
1946	37.9 °C20 May 1946	14.9 °C26 January 1946	25.3 °C	1,500 mm	177
1945	38.4 °C24 April 1945	11.0 °C6 December 1945	25.4 °C	1,691 mm	176
1944	39.6 °C25 May 1944	12.8 °C22 January 1944	25.0 °C	1,335 mm	174
1943	36.8 °C24 July 1943	13.5 °C21 December 1943	24.5 °C	2,168 mm	148
1942	37.8 °C14 May 1942	14.8 °C30 December 1942	24.6 °C	2,060 mm	146
1941	38.7 °C19 April 1941	12.0 °C11 February 1941	25.5 °C	1,301 mm	191
1940	38.5 °C1 May 1940	14.0 °C25 January 1940	25.1 °C	1,563 mm	183

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

32.1 °C

+1.8 °C

Hot days (≥ 30 °C)

266 d/yr

+63

Frost days (< 0 °C)

0 d/yr

Annual rainfall

1388 mm

-237 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	27.6 °C	+1.4 °C	138 mm	+24 mm
Feb	29.4 °C	+1.8 °C	133 mm	+54 mm
Mar	32.2 °C	+1.7 °C	38 mm	-17 mm
Apr	33.4 °C	+0.3 °C	32 mm	-24 mm
May	36.8 °C	+2.7 °C	35 mm	-55 mm
Jun	33.9 °C	+1.3 °C	202 mm	+21 mm
Jul	35.5 °C	+3.1 °C	57 mm	-77 mm
Aug	34.7 °C	+2.4 °C	122 mm	-54 mm
Sep	33.0 °C	+2.2 °C	246 mm	-10 mm
Oct	30.8 °C	+1.5 °C	197 mm	-31 mm
Nov	29.4 °C	+1.5 °C	77 mm	-73 mm
Dec	28.8 °C	+2.1 °C	113 mm	+5 mm

The year's extremes

Hottest day

40.5 °C

7 May 2025

Coldest day

15.2 °C

23 Jan 2025

Wettest day

68.4 mm

20 Feb 2025

Windiest day

26.8 km/h

10 Nov 2025

Strongest gust

55.4 km/h

27 Jul 2025

Hottest feels-like

48.2 °C

20 May 2025

Coldest feels-like

16.0 °C

23 Jan 2025

Sunniest day

12.8 h

5 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 Reforma?

Reforma has a tropical monsoon climate (Köppen Am). Over 1940-2025, the average annual temperature is 25.6 °C and it receives 1,625 mm of precipitation per year.

What is the hottest day ever recorded in Reforma?

The hottest day measured in Reforma between 1940 and 2025 was 17 May 2024, reaching 42.8 °C.

What is the coldest day in Reforma?

The coldest day measured in Reforma between 1940 and 2025 was 27 December 1989, at 10.4 °C.

Does it snow in Reforma?

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

Has the climate of Reforma warmed?

Yes: Reforma warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Reforma?

The wettest day measured in Reforma between 1940 and 2025 was 21 August 1973, with 304 mm of rain in 24 hours.

What was the windiest day in Reforma?

The windiest day measured in Reforma between 1940 and 2025 was 21 August 1973, with winds reaching 44.3 km/h.

What is the warmest month in Reforma?

The warmest month in Reforma is May (28.8 °C on average); the coldest is January (22.0 °C).

How much does it rain in Reforma?

Reforma receives on average 1,625 mm of precipitation per year, spread over about 184 rainy days.

Is it sunny in Reforma?

Reforma gets on average 9.9 hours of sunshine per day, roughly 3,614 hours per year over 1940-2025.

Are there tropical nights in Reforma?

Yes: Reforma has on average 285 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Reforma?

In Reforma, between 1940 and 2025, the highest apparent temperature reached 49.4 °C on 27 May 2024, and the lowest was 9.5 °C on 27 December 1989.

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