San Dimas Weather Records (MXN00010064)

Record envelope, standing records and threshold days for San Dimas (MXN00010064), Mexico, with 53 years of record.

Key Facts for San Dimas

San Dimas (MXN00010064) is a weather station in Mexico at 24.13 latitude and -105.95 longitude, 880 m (2,887 ft) above sea level.
The station reports from 1961 to 2013, 53 years of record.
1,464 records set at San Dimas still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
San Dimas set a daily record high maximum temperature of 33.9 C (93.0 F) on 26 January 2013.

About the Station

Location: Mexico, 24.13 latitude, -105.95 longitude.
Elevation: 880 m (2,887 ft).
Period of record: 1961 to 2013, 53 years.
Eligible elements: tmax, tmin, prcp.

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 San Dimas. 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 San Dimas, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	38.9 C (102.0 F)	0.0 C (32.0 F)	n/a	n/a
Feb	38.9 C (102.0 F)	3.9 C (39.0 F)	n/a	n/a
Mar	40.6 C (105.1 F)	2.8 C (37.0 F)	n/a	n/a
Apr	41.7 C (107.1 F)	5.0 C (41.0 F)	n/a	n/a
May	40.6 C (105.1 F)	7.2 C (45.0 F)	n/a	n/a
Jun	42.8 C (109.0 F)	11.7 C (53.1 F)	n/a	n/a
Jul	37.8 C (100.0 F)	11.7 C (53.1 F)	n/a	n/a
Aug	39.4 C (102.9 F)	10.6 C (51.1 F)	n/a	n/a
Sep	39.4 C (102.9 F)	10.6 C (51.1 F)	n/a	n/a
Oct	40.0 C (104.0 F)	7.8 C (46.0 F)	n/a	n/a
Nov	38.9 C (102.0 F)	5.0 C (41.0 F)	n/a	n/a
Dec	38.9 C (102.0 F)	5.0 C (41.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at San Dimas still stand. 1970 holds the most, with 216.

Standing records at San Dimas by the year they were set
Year set	Standing records
1962	127
1963	56
1964	33
1965	39
1966	92
1967	74
1968	20
1969	90
1970	216
1973	4
1974	29
1975	31
1976	43
1978	27
1979	33
1980	12
1981	17
1982	13
1983	29
1984	27
1985	20
2002	27
2003	46
2004	54
2005	35
2006	41
2007	28
2008	30
2009	43
2010	17
2011	47
2012	61
2013	3

Wettest Day of Each Month

Jan: 281.9 mm (11.1 in)

The wettest day on record for each calendar month at San Dimas. The most was 281.9 mm (11.1 in) on 25 January 1979.

Record daily precipitation for each month at San Dimas
Month	Record daily precipitation (mm)	Date
Jan	281.9 mm (11.1 in)	25 January 1979
Feb	48.3 mm (1.9 in)	18 February 2012
Mar	114.8 mm (4.5 in)	5 March 1983
Apr	13.0 mm (0.5 in)	26 April 1985
May	32.8 mm (1.3 in)	12 May 2009
Jun	119.9 mm (4.7 in)	14 June 1971
Jul	190.0 mm (7.5 in)	25 July 1970
Aug	87.9 mm (3.5 in)	14 August 1973
Sep	84.8 mm (3.3 in)	5 September 1981
Oct	63.8 mm (2.5 in)	16 October 1980
Nov	96.8 mm (3.8 in)	23 November 1972
Dec	81.0 mm (3.2 in)	11 December 1963

Period of Record Coverage

1962 to 2013

34 years of record at San Dimas, 1962 to 2013. 10 years have data for under 90 percent of days and are left out of rankings: 1962, 1963, 1969, 1970, 1973, 1976, 1977, 1984 and others.

Days with data per year at San Dimas
Year	Days with data	Share of year	Complete
1962	258	71%	No
1963	298	82%	No
1964	366	100%	Yes
1965	364	100%	Yes
1966	365	100%	Yes
1967	342	94%	Yes
1968	334	91%	Yes
1969	233	64%	No
1970	182	50%	No
1973	112	31%	No
1974	364	100%	Yes
1975	365	100%	Yes
1976	238	65%	No
1977	45	12%	No
1978	365	100%	Yes
1979	364	100%	Yes
1980	335	92%	Yes
1981	364	100%	Yes
1982	364	100%	Yes
1983	335	92%	Yes
1984	304	83%	No
1985	212	58%	No
2002	364	100%	Yes
2003	365	100%	Yes
2004	335	92%	Yes
2005	364	100%	Yes
2006	334	92%	Yes
2007	365	100%	Yes
2008	336	92%	Yes
2009	365	100%	Yes
2010	332	91%	Yes
2011	365	100%	Yes
2012	366	100%	Yes
2013	31	8%	No

Latest Records

Latest records at San Dimas
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
26 January 2013	San Dimas, MX	daily high max	33.9 C (93.0 F)	0.6 C (1.1 F)	38 years	17 of 100 (Routine)
26 January 2013	San Dimas, MX	daily high min (Tie)	15.0 C (59.0 F)	tie	45 years	4 of 100 (Routine)
13 January 2013	San Dimas, MX	daily low max	16.7 C (62.1 F)	1.1 C (2.0 F)	43 years	19 of 100 (Routine)
10 January 2013	San Dimas, MX	daily low min	5.0 C (41.0 F)	1.7 C (3.1 F)	43 years	23 of 100 (Routine)
2 January 2013	San Dimas, MX	daily low max (Tie)	18.9 C (66.0 F)	tie	43 years	4 of 100 (Routine)
27 September 2012	San Dimas, MX	daily rain	54.9 mm (2.2 in)	21.1 mm (0.8 in)	49 years	35 of 100 (Notable)
1 September 2012	San Dimas, MX	daily rain	45.0 mm (1.8 in)	25.2 mm (1.0 in)	38 years	35 of 100 (Notable)
18 February 2012	San Dimas, MX	monthly rain	48.3 mm (1.9 in)	1.3 mm (0.05 in)	28 years	24 of 100 (Routine)
20 December 2011	San Dimas, MX	daily rain	9.9 mm (0.39 in)	5.6 mm (0.22 in)	44 years	20 of 100 (Routine)
6 December 2011	San Dimas, MX	daily rain	10.2 mm (0.4 in)	0.3 mm (0.01 in)	48 years	19 of 100 (Routine)
4 December 2011	San Dimas, MX	daily rain	15.7 mm (0.6 in)	0.2 mm (0.01 in)	41 years	17 of 100 (Routine)
15 November 2011	San Dimas, MX	daily rain	20.1 mm (0.8 in)	17.3 mm (0.7 in)	33 years	20 of 100 (Routine)
2 October 2011	San Dimas, MX	daily rain	22.9 mm (0.9 in)	7.7 mm (0.30 in)	33 years	20 of 100 (Routine)
5 August 2010	San Dimas, MX	daily rain (Tie)	33.8 mm (1.3 in)	tie	36 years	4 of 100 (Routine)
10 July 2010	San Dimas, MX	daily rain	49.8 mm (2.0 in)	2.8 mm (0.11 in)	7 years	8 of 100 (Routine)
3 July 2010	San Dimas, MX	daily rain	42.9 mm (1.7 in)	20.8 mm (0.8 in)	1 year	17 of 100 (Routine)
18 February 2010	San Dimas, MX	daily rain	10.9 mm (0.4 in)	4.8 mm (0.19 in)	47 years	20 of 100 (Routine)
4 February 2010	San Dimas, MX	daily rain	30.0 mm (1.2 in)	10.2 mm (0.4 in)	4 years	15 of 100 (Routine)
3 February 2010	San Dimas, MX	daily rain	38.4 mm (1.5 in)	18.6 mm (0.7 in)	4 years	22 of 100 (Routine)
29 December 2009	San Dimas, MX	daily rain	38.4 mm (1.5 in)	30.3 mm (1.2 in)	31 years	29 of 100 (Routine)

Climate Trend

16 complete years, 1964 to 2012

One stripe for each of 16 complete years at San Dimas, 1964 to 2012. Blue stripes are years cooler than the station's own mean of 23.8 C (74.8 F); red stripes are warmer. The coolest year was 1981, at 21.8 C (71.3 F), and the warmest was 2011, at 25.0 C (77.1 F). The strongest colour marks a difference of 2.0 C (3.6 F).

Annual mean temperature at San Dimas as warming stripes, 1964 to 2012
Year	Annual mean temperature	Difference from the station mean
1964	23.3 C	-0.50 C
1965	24.3 C	+0.52 C
1966	25.0 C	+1.18 C
1974	23.9 C	+0.16 C
1975	23.7 C	-0.06 C
1978	22.7 C	-1.03 C
1979	22.4 C	-1.38 C
1981	21.8 C	-1.93 C
1982	22.8 C	-0.93 C
2002	24.0 C	+0.25 C
2003	24.6 C	+0.79 C
2005	24.1 C	+0.37 C
2007	24.1 C	+0.32 C
2009	24.4 C	+0.63 C
2011	25.0 C	+1.27 C
2012	24.1 C	+0.36 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

1961 to 2013

Yearly extremes at San Dimas: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	42.8 C (109.0 F)	1966	38.9 C (102.0 F)	34
Coldest night (TNn)	0.0 C (32.0 F)	1970	6.7 C (44.1 F)	34
Wettest day (Rx1day)	281.9 mm (11.1 in)	1979	71.9 mm (2.8 in)	37
Wettest five days (Rx5day)	294.9 mm (11.6 in)	1979	115.9 mm (4.6 in)	37
Longest dry spell (CDD)	184 days	2011	80 days	37

Hottest day (TXx)

The hottest day of the year at San Dimas, 1961 to 2013. The record is 42.8 C (109.0 F) in 1966, marked on the chart; the median year is 38.9 C (102.0 F).

Hottest day (TXx) at San Dimas by year
Year	Hottest day (TXx)
1961	n/a
1962	37.8 C (100.0 F)
1963	36.7 C (98.1 F)
1964	37.8 C (100.0 F)
1965	41.7 C (107.1 F)
1966	42.8 C (109.0 F)
1967	40.6 C (105.1 F)
1968	36.7 C (98.1 F)
1969	38.9 C (102.0 F)
1970	35.6 C (96.1 F)
1971	n/a
1972	n/a
1973	35.6 C (96.1 F)
1974	37.8 C (100.0 F)
1975	38.9 C (102.0 F)
1976	37.8 C (100.0 F)
1977	32.2 C (90.0 F)
1978	38.3 C (100.9 F)
1979	39.4 C (102.9 F)
1980	36.7 C (98.1 F)
1981	38.9 C (102.0 F)
1982	36.7 C (98.1 F)
1983	36.7 C (98.1 F)
1984	38.9 C (102.0 F)
1985	40.0 C (104.0 F)
2002	38.9 C (102.0 F)
2003	40.0 C (104.0 F)
2004	40.0 C (104.0 F)
2005	40.0 C (104.0 F)
2006	40.6 C (105.1 F)
2007	40.0 C (104.0 F)
2008	40.0 C (104.0 F)
2009	42.8 C (109.0 F)
2010	38.9 C (102.0 F)
2011	40.0 C (104.0 F)
2012	40.6 C (105.1 F)
2013	35.0 C (95.0 F)

Coldest night (TNn)

The coldest night of the year at San Dimas, 1961 to 2013. The record is 0.0 C (32.0 F) in 1970, marked on the chart; the median year is 6.7 C (44.1 F).

Coldest night (TNn) at San Dimas by year
Year	Coldest night (TNn)
1961	n/a
1962	10.0 C (50.0 F)
1963	7.8 C (46.0 F)
1964	6.1 C (43.0 F)
1965	10.0 C (50.0 F)
1966	5.6 C (42.1 F)
1967	8.9 C (48.0 F)
1968	6.7 C (44.1 F)
1969	5.0 C (41.0 F)
1970	0.0 C (32.0 F)
1971	n/a
1972	n/a
1973	7.8 C (46.0 F)
1974	7.8 C (46.0 F)
1975	7.8 C (46.0 F)
1976	7.8 C (46.0 F)
1977	10.6 C (51.1 F)
1978	9.4 C (48.9 F)
1979	5.0 C (41.0 F)
1980	8.9 C (48.0 F)
1981	5.6 C (42.1 F)
1982	5.6 C (42.1 F)
1983	6.7 C (44.1 F)
1984	6.7 C (44.1 F)
1985	5.6 C (42.1 F)
2002	6.7 C (44.1 F)
2003	7.8 C (46.0 F)
2004	5.0 C (41.0 F)
2005	7.8 C (46.0 F)
2006	9.4 C (48.9 F)
2007	6.1 C (43.0 F)
2008	5.0 C (41.0 F)
2009	7.2 C (45.0 F)
2010	5.6 C (42.1 F)
2011	5.6 C (42.1 F)
2012	7.2 C (45.0 F)
2013	5.0 C (41.0 F)

Wettest day (Rx1day)

The wettest day of the year at San Dimas, 1961 to 2013. The record is 281.9 mm (11.1 in) in 1979, marked on the chart; the median year is 71.9 mm (2.8 in).

Wettest day (Rx1day) at San Dimas by year
Year	Wettest day (Rx1day)
1961	61.2 mm (2.4 in)
1962	48.3 mm (1.9 in)
1963	81.0 mm (3.2 in)
1964	93.2 mm (3.7 in)
1965	17.3 mm (0.7 in)
1966	36.3 mm (1.4 in)
1967	23.9 mm (0.9 in)
1968	79.8 mm (3.1 in)
1969	48.8 mm (1.9 in)
1970	190.0 mm (7.5 in)
1971	119.9 mm (4.7 in)
1972	96.8 mm (3.8 in)
1973	89.9 mm (3.5 in)
1974	79.8 mm (3.1 in)
1975	90.9 mm (3.6 in)
1976	55.9 mm (2.2 in)
1977	85.3 mm (3.4 in)
1978	74.9 mm (2.9 in)
1979	281.9 mm (11.1 in)
1980	70.9 mm (2.8 in)
1981	84.8 mm (3.3 in)
1982	71.9 mm (2.8 in)
1983	114.8 mm (4.5 in)
1984	69.9 mm (2.8 in)
1985	62.0 mm (2.4 in)
2002	78.0 mm (3.1 in)
2003	49.8 mm (2.0 in)
2004	95.0 mm (3.7 in)
2005	58.9 mm (2.3 in)
2006	69.9 mm (2.8 in)
2007	86.1 mm (3.4 in)
2008	82.8 mm (3.3 in)
2009	63.8 mm (2.5 in)
2010	49.8 mm (2.0 in)
2011	40.9 mm (1.6 in)
2012	54.9 mm (2.2 in)
2013	32.8 mm (1.3 in)

Wettest five days (Rx5day)

The wettest five days of the year at San Dimas, 1961 to 2013. The record is 294.9 mm (11.6 in) in 1979, marked on the chart; the median year is 115.9 mm (4.6 in).

Wettest five days (Rx5day) at San Dimas by year
Year	Wettest five days (Rx5day)
1961	111.5 mm (4.4 in)
1962	86.7 mm (3.4 in)
1963	183.9 mm (7.2 in)
1964	143.2 mm (5.6 in)
1965	40.1 mm (1.6 in)
1966	75.0 mm (3.0 in)
1967	58.8 mm (2.3 in)
1968	115.9 mm (4.6 in)
1969	73.0 mm (2.9 in)
1970	267.8 mm (10.5 in)
1971	140.7 mm (5.5 in)
1972	174.8 mm (6.9 in)
1973	183.4 mm (7.2 in)
1974	196.3 mm (7.7 in)
1975	135.2 mm (5.3 in)
1976	82.2 mm (3.2 in)
1977	126.8 mm (5.0 in)
1978	123.9 mm (4.9 in)
1979	294.9 mm (11.6 in)
1980	115.1 mm (4.5 in)
1981	173.2 mm (6.8 in)
1982	139.6 mm (5.5 in)
1983	114.8 mm (4.5 in)
1984	102.7 mm (4.0 in)
1985	141.2 mm (5.6 in)
2002	133.1 mm (5.2 in)
2003	94.5 mm (3.7 in)
2004	110.0 mm (4.3 in)
2005	95.2 mm (3.7 in)
2006	141.2 mm (5.6 in)
2007	115.3 mm (4.5 in)
2008	161.8 mm (6.4 in)
2009	127.3 mm (5.0 in)
2010	69.2 mm (2.7 in)
2011	53.7 mm (2.1 in)
2012	83.3 mm (3.3 in)
2013	32.8 mm (1.3 in)

Longest dry spell (CDD)

The longest dry spell of the year at San Dimas, 1961 to 2013. The record is 184 days in 2011, marked on the chart; the median year is 80 days.

Longest dry spell (CDD) at San Dimas by year
Year	Longest dry spell (CDD)
1961	17 days
1962	54 days
1963	57 days
1964	65 days
1965	142 days
1966	75 days
1967	88 days
1968	63 days
1969	47 days
1970	57 days
1971	110 days
1972	101 days
1973	64 days
1974	160 days
1975	147 days
1976	72 days
1977	46 days
1978	41 days
1979	98 days
1980	36 days
1981	48 days
1982	149 days
1983	28 days
1984	104 days
1985	55 days
2002	97 days
2003	101 days
2004	102 days
2005	100 days
2006	107 days
2007	141 days
2008	61 days
2009	125 days
2010	80 days
2011	184 days
2012	113 days
2013	30 days

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.

Rainfall Return Levels

32 years, 1962 to 2012

A day with at least 70.6 mm (2.8 in) of rain is expected about once in 2 years. A day with at least 247.4 mm (9.7 in) of rain is expected about once in 100 years.

Rainfall return levels at San Dimas: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	70.6 mm (2.8 in)
5 years	105.9 mm (4.2 in)
10 years	133.5 mm (5.3 in)
25 years	173.9 mm (6.8 in)
50 years	208.5 mm (8.2 in)	Longer than the 32 years of record
100 years	247.4 mm (9.7 in)	Longer than the 32 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 32 years of values from 1962 to 2012.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 281.9 mm (11.1 in) in 1979; 190.0 mm (7.5 in) in 1970; 119.9 mm (4.7 in) in 1971.

Download the Data

Data for San Dimas standing records by year: CSV or JSON. Field meanings are on the data page.
Data for San Dimas 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 2026-10-17 (17 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).