Castaos (Smn) Weather Records (MXN00005052)

Record envelope, standing records and threshold days for Castaos (Smn) (MXN00005052), Mexico, with 67 years of record.

Key Facts for Castaos (Smn)

Castaos (Smn) (MXN00005052) is a weather station in Mexico at 26.78 latitude and -101.43 longitude, 743 m (2,437 ft) above sea level.
The station reports from 1944 to 2010, 67 years of record.
1,464 records set at Castaos (Smn) still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Mexico, 26.78 latitude, -101.43 longitude.
Elevation: 743 m (2,437 ft).
Period of record: 1944 to 2010, 67 years.
Eligible elements: none yet.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Castaos (Smn). The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Castaos (Smn), with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	35.6 C (96.1 F)	-9.4 C (15.1 F)	n/a	n/a
Feb	38.9 C (102.0 F)	-9.4 C (15.1 F)	n/a	n/a
Mar	37.8 C (100.0 F)	-9.4 C (15.1 F)	n/a	n/a
Apr	40.0 C (104.0 F)	-2.2 C (28.0 F)	n/a	n/a
May	42.8 C (109.0 F)	5.0 C (41.0 F)	n/a	n/a
Jun	43.9 C (111.0 F)	11.7 C (53.1 F)	n/a	n/a
Jul	40.6 C (105.1 F)	11.7 C (53.1 F)	n/a	n/a
Aug	40.6 C (105.1 F)	10.0 C (50.0 F)	n/a	n/a
Sep	38.9 C (102.0 F)	3.9 C (39.0 F)	n/a	n/a
Oct	37.8 C (100.0 F)	-1.1 C (30.0 F)	n/a	n/a
Nov	35.6 C (96.1 F)	-6.1 C (21.0 F)	n/a	n/a
Dec	35.0 C (95.0 F)	-7.2 C (19.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Castaos (Smn) still stand. 1945 holds the most, with 123.

Standing records at Castaos (Smn) by the year they were set
Year set	Standing records
1944	3
1945	123
1946	73
1947	95
1948	82
1949	73
1950	62
1951	53
1952	28
1953	101
1954	48
1955	80
1956	49
1957	85
1958	74
1959	93
1960	65
1986	5
1998	8
2007	77
2008	91
2009	25
2010	71

Wettest Day of Each Month

Apr: 89.9 mm (3.5 in)

The wettest day on record for each calendar month at Castaos (Smn). The most was 89.9 mm (3.5 in) on 24 April 1952.

Record daily precipitation for each month at Castaos (Smn)
Month	Record daily precipitation (mm)	Date
Jan	30.0 mm (1.2 in)	12 January 1955
Feb	22.9 mm (0.9 in)	12 February 1960
Mar	11.9 mm (0.5 in)	20 March 1953
Apr	89.9 mm (3.5 in)	24 April 1952
May	59.9 mm (2.4 in)	14 May 1956
Jun	51.3 mm (2.0 in)	7 June 1949
Jul	41.4 mm (1.6 in)	1 July 1956
Aug	74.9 mm (2.9 in)	14 August 1955
Sep	69.3 mm (2.7 in)	6 September 1958
Oct	20.3 mm (0.8 in)	20 October 1957
Nov	39.9 mm (1.6 in)	7 November 1955
Dec	7.4 mm (0.29 in)	29 December 1949

Period of Record Coverage

1944 to 2010

23 years of record at Castaos (Smn), 1944 to 2010. 5 years have data for under 90 percent of days and are left out of rankings: 1944, 1952, 1986, 1998, 2009.

Days with data per year at Castaos (Smn)
Year	Days with data	Share of year	Complete
1944	10	3%	No
1945	364	100%	Yes
1946	362	99%	Yes
1947	363	99%	Yes
1948	365	100%	Yes
1949	360	99%	Yes
1950	365	100%	Yes
1951	362	99%	Yes
1952	241	66%	No
1953	365	100%	Yes
1954	364	100%	Yes
1955	363	99%	Yes
1956	366	100%	Yes
1957	358	98%	Yes
1958	358	98%	Yes
1959	363	99%	Yes
1960	362	99%	Yes
1986	30	8%	No
1998	50	14%	No
2007	350	96%	Yes
2008	353	96%	Yes
2009	204	56%	No
2010	351	96%	Yes

Latest Records

No records were set at this station in the latest data.

Climate Trend

18 complete years, 1945 to 2010

One stripe for each of 18 complete years at Castaos (Smn), 1945 to 2010. Blue stripes are years cooler than the station's own mean of 19.8 C (67.6 F); red stripes are warmer. The coolest year was 1959, at 18.4 C (65.1 F), and the warmest was 1950, at 21.6 C (70.9 F). The strongest colour marks a difference of 1.9 C (3.4 F).

Annual mean temperature at Castaos (Smn) as warming stripes, 1945 to 2010
Year	Annual mean temperature	Difference from the station mean
1945	21.5 C	+1.72 C
1946	20.7 C	+0.86 C
1947	19.1 C	-0.66 C
1948	19.8 C	+0.05 C
1949	19.7 C	-0.06 C
1950	21.6 C	+1.84 C
1951	20.3 C	+0.47 C
1953	21.1 C	+1.31 C
1954	20.3 C	+0.55 C
1955	19.5 C	-0.26 C
1956	19.4 C	-0.38 C
1957	19.3 C	-0.45 C
1958	19.3 C	-0.48 C
1959	18.4 C	-1.39 C
1960	19.8 C	-0.02 C
2007	18.4 C	-1.38 C
2008	19.1 C	-0.71 C
2010	18.8 C	-1.04 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1944 to 2010

Yearly extremes at Castaos (Smn): the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	43.9 C (111.0 F)	1945	40.0 C (104.0 F)	23
Coldest night (TNn)	-9.4 C (15.1 F)	1949	-7.2 C (19.0 F)	23
Wettest day (Rx1day)	89.9 mm (3.5 in)	1952	32.9 mm (1.3 in)	22
Wettest five days (Rx5day)	164.6 mm (6.5 in)	1955	57.2 mm (2.3 in)	22
Longest dry spell (CDD)	101 days	1946	58 days	22

Hottest day (TXx)

The hottest day of the year at Castaos (Smn), 1944 to 2010. The record is 43.9 C (111.0 F) in 1945, marked on the chart; the median year is 40.0 C (104.0 F).

Hottest day (TXx) at Castaos (Smn) by year
Year	Hottest day (TXx)
1944	27.8 C (82.0 F)
1945	43.9 C (111.0 F)
1946	40.0 C (104.0 F)
1947	39.4 C (102.9 F)
1948	40.0 C (104.0 F)
1949	40.0 C (104.0 F)
1950	40.6 C (105.1 F)
1951	40.6 C (105.1 F)
1952	37.8 C (100.0 F)
1953	42.8 C (109.0 F)
1954	40.0 C (104.0 F)
1955	41.7 C (107.1 F)
1956	36.7 C (98.1 F)
1957	40.0 C (104.0 F)
1958	40.6 C (105.1 F)
1959	36.7 C (98.1 F)
1960	40.0 C (104.0 F)
1986	30.0 C (86.0 F)
1998	35.0 C (95.0 F)
2007	41.7 C (107.1 F)
2008	41.7 C (107.1 F)
2009	38.9 C (102.0 F)
2010	41.7 C (107.1 F)

Coldest night (TNn)

The coldest night of the year at Castaos (Smn), 1944 to 2010. The record is -9.4 C (15.1 F) in 1949, marked on the chart; the median year is -7.2 C (19.0 F).

Coldest night (TNn) at Castaos (Smn) by year
Year	Coldest night (TNn)
1944	3.9 C (39.0 F)
1945	-4.4 C (24.1 F)
1946	-4.4 C (24.1 F)
1947	-5.0 C (23.0 F)
1948	-8.3 C (17.1 F)
1949	-9.4 C (15.1 F)
1950	-5.0 C (23.0 F)
1951	-8.3 C (17.1 F)
1952	-5.0 C (23.0 F)
1953	-6.1 C (21.0 F)
1954	-7.2 C (19.0 F)
1955	-9.4 C (15.1 F)
1956	-9.4 C (15.1 F)
1957	-8.3 C (17.1 F)
1958	-7.2 C (19.0 F)
1959	-8.3 C (17.1 F)
1960	-6.1 C (21.0 F)
1986	-4.4 C (24.1 F)
1998	-5.0 C (23.0 F)
2007	-7.2 C (19.0 F)
2008	-8.3 C (17.1 F)
2009	-3.3 C (26.1 F)
2010	-7.2 C (19.0 F)

Wettest day (Rx1day)

The wettest day of the year at Castaos (Smn), 1944 to 2010. The record is 89.9 mm (3.5 in) in 1952, marked on the chart; the median year is 32.9 mm (1.3 in).

Wettest day (Rx1day) at Castaos (Smn) by year
Year	Wettest day (Rx1day)
1944	0.0 mm (0.00 in)
1945	16.8 mm (0.7 in)
1946	40.9 mm (1.6 in)
1947	30.0 mm (1.2 in)
1948	34.8 mm (1.4 in)
1949	55.9 mm (2.2 in)
1950	29.5 mm (1.2 in)
1951	31.0 mm (1.2 in)
1952	89.9 mm (3.5 in)
1953	20.8 mm (0.8 in)
1954	34.8 mm (1.4 in)
1955	74.9 mm (2.9 in)
1956	59.9 mm (2.4 in)
1957	37.3 mm (1.5 in)
1958	69.3 mm (2.7 in)
1959	34.8 mm (1.4 in)
1960	34.8 mm (1.4 in)
1986	0.0 mm (0.00 in)
1998	0.0 mm (0.00 in)
2007	0.8 mm (0.03 in)
2008	0.8 mm (0.03 in)
2009	0.8 mm (0.03 in)
2010	n/a

Wettest five days (Rx5day)

The wettest five days of the year at Castaos (Smn), 1944 to 2010. The record is 164.6 mm (6.5 in) in 1955, marked on the chart; the median year is 57.2 mm (2.3 in).

Wettest five days (Rx5day) at Castaos (Smn) by year
Year	Wettest five days (Rx5day)
1944	0.0 mm (0.00 in)
1945	29.7 mm (1.2 in)
1946	86.7 mm (3.4 in)
1947	80.3 mm (3.2 in)
1948	54.4 mm (2.1 in)
1949	81.3 mm (3.2 in)
1950	38.4 mm (1.5 in)
1951	89.1 mm (3.5 in)
1952	89.9 mm (3.5 in)
1953	74.3 mm (2.9 in)
1954	91.2 mm (3.6 in)
1955	164.6 mm (6.5 in)
1956	59.9 mm (2.4 in)
1957	82.0 mm (3.2 in)
1958	130.3 mm (5.1 in)
1959	48.5 mm (1.9 in)
1960	41.7 mm (1.6 in)
1986	0.0 mm (0.00 in)
1998	0.0 mm (0.00 in)
2007	0.8 mm (0.03 in)
2008	1.6 mm (0.06 in)
2009	1.6 mm (0.06 in)
2010	n/a

Longest dry spell (CDD)

The longest dry spell of the year at Castaos (Smn), 1944 to 2010. The record is 101 days in 1946, marked on the chart; the median year is 58 days.

Longest dry spell (CDD) at Castaos (Smn) by year
Year	Longest dry spell (CDD)
1944	10 days
1945	67 days
1946	101 days
1947	64 days
1948	62 days
1949	36 days
1950	100 days
1951	69 days
1952	67 days
1953	53 days
1954	97 days
1955	84 days
1956	95 days
1957	46 days
1958	47 days
1959	41 days
1960	81 days
1986	31 days
1998	29 days
2007	30 days
2008	30 days
2009	30 days
2010	n/a

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Download the Data

Data for Castaos (Smn) standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Castaos (Smn) threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-16 (16 October 2026). Records are computed by this site and are not official.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).