San Bruno Weather Records (MXN00003093)

Record envelope, standing records and threshold days for San Bruno (MXN00003093), Mexico, with 40 years of record.

Key Facts for San Bruno

San Bruno (MXN00003093) is a weather station in Mexico at 27.15 latitude and -112.15 longitude, 20 m (65 ft) above sea level.
The station reports from 1973 to 2012, 40 years of record.
1,464 records set at San Bruno still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
San Bruno tied a daily record low maximum temperature of 20.0 C (68.0 F) on 26 November 2012.

About the Station

Location: Mexico, 27.15 latitude, -112.15 longitude.
Elevation: 20 m (65 ft).
Period of record: 1973 to 2012, 40 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 Bruno. 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 Bruno, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	30.6 C (87.1 F)	0.0 C (32.0 F)	n/a	n/a
Feb	33.9 C (93.0 F)	1.7 C (35.1 F)	n/a	n/a
Mar	36.7 C (98.1 F)	1.7 C (35.1 F)	n/a	n/a
Apr	37.8 C (100.0 F)	5.0 C (41.0 F)	n/a	n/a
May	38.9 C (102.0 F)	5.6 C (42.1 F)	n/a	n/a
Jun	41.7 C (107.1 F)	8.9 C (48.0 F)	n/a	n/a
Jul	45.6 C (114.1 F)	11.7 C (53.1 F)	n/a	n/a
Aug	45.0 C (113.0 F)	10.0 C (50.0 F)	n/a	n/a
Sep	41.7 C (107.1 F)	12.8 C (55.0 F)	n/a	n/a
Oct	40.6 C (105.1 F)	5.6 C (42.1 F)	n/a	n/a
Nov	38.9 C (102.0 F)	1.7 C (35.1 F)	n/a	n/a
Dec	36.7 C (98.1 F)	1.7 C (35.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at San Bruno still stand. 1988 holds the most, with 108.

Standing records at San Bruno by the year they were set
Year set	Standing records
1973	17
1974	38
1975	75
1976	29
1977	31
1978	44
1979	41
1980	40
1981	41
1982	29
1983	61
1984	28
1985	31
1986	46
1987	33
1988	108
1989	21
1990	91
1991	20
1992	46
1993	14
1997	24
2000	72
2001	24
2002	34
2003	60
2004	52
2005	82
2006	85
2007	51
2008	16
2009	24
2010	10
2011	30
2012	16

Wettest Day of Each Month

Aug: 190.0 mm (7.5 in)

The wettest day on record for each calendar month at San Bruno. The most was 190.0 mm (7.5 in) on 15 August 1983.

Record daily precipitation for each month at San Bruno
Month	Record daily precipitation (mm)	Date
Jan	64.8 mm (2.6 in)	28 January 1975
Feb	39.9 mm (1.6 in)	26 February 1981
Mar	30.0 mm (1.2 in)	1 March 1981
Apr	30.0 mm (1.2 in)	21 April 1981
May	0.0 mm (0.00 in)	1 May 1974
Jun	19.8 mm (0.8 in)	18 June 2009
Jul	114.8 mm (4.5 in)	9 July 1981
Aug	190.0 mm (7.5 in)	15 August 1983
Sep	159.8 mm (6.3 in)	2 September 2006
Oct	140.0 mm (5.5 in)	8 October 1981
Nov	35.8 mm (1.4 in)	30 November 2002
Dec	78.0 mm (3.1 in)	15 December 1990

Period of Record Coverage

1973 to 2012

35 years of record at San Bruno, 1973 to 2012. 8 years have data for under 90 percent of days and are left out of rankings: 1973, 1986, 1990, 1991, 1993, 1997, 2010, 2011.

Days with data per year at San Bruno
Year	Days with data	Share of year	Complete
1973	171	47%	No
1974	365	100%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	366	100%	Yes
1981	365	100%	Yes
1982	365	100%	Yes
1983	365	100%	Yes
1984	366	100%	Yes
1985	365	100%	Yes
1986	259	71%	No
1987	365	100%	Yes
1988	366	100%	Yes
1989	365	100%	Yes
1990	302	83%	No
1991	151	41%	No
1992	346	95%	Yes
1993	276	76%	No
1997	123	34%	No
2000	362	99%	Yes
2001	365	100%	Yes
2002	364	100%	Yes
2003	365	100%	Yes
2004	366	100%	Yes
2005	365	100%	Yes
2006	364	100%	Yes
2007	362	99%	Yes
2008	361	99%	Yes
2009	365	100%	Yes
2010	181	50%	No
2011	275	75%	No
2012	353	96%	Yes

Latest Records

Latest records at San Bruno
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
26 November 2012	San Bruno, MX	daily low max (Tie)	20.0 C (68.0 F)	tie	39 years	3 of 100 (Routine)
13 November 2012	San Bruno, MX	daily high min	18.9 C (66.0 F)	2.8 C (5.0 F)	22 years	19 of 100 (Routine)
12 November 2012	San Bruno, MX	daily low max (Tie)	21.7 C (71.1 F)	tie	9 years	1 of 100 (Routine)
17 October 2012	San Bruno, MX	daily high min	27.8 C (82.0 F)	2.2 C (4.0 F)	8 years	12 of 100 (Routine)
16 October 2012	San Bruno, MX	daily rain	15.5 mm (0.6 in)	15.5 mm (0.6 in)	39 years	20 of 100 (Routine)
16 October 2012	San Bruno, MX	daily high min	25.6 C (78.1 F)	1.7 C (3.1 F)	8 years	10 of 100 (Routine)
7 October 2012	San Bruno, MX	daily high min (Tie)	23.9 C (75.0 F)	tie	33 years	3 of 100 (Routine)
30 September 2012	San Bruno, MX	daily rain	1.8 mm (0.07 in)	1.8 mm (0.07 in)	39 years	15 of 100 (Routine)
31 August 2012	San Bruno, MX	daily high min	27.8 C (82.0 F)	1.1 C (2.0 F)	30 years	16 of 100 (Routine)
20 August 2012	San Bruno, MX	daily high min	27.8 C (82.0 F)	1.1 C (2.0 F)	11 years	10 of 100 (Routine)
19 August 2012	San Bruno, MX	daily high min	28.9 C (84.0 F)	1.1 C (2.0 F)	3 years	7 of 100 (Routine)
17 August 2012	San Bruno, MX	daily low max (Tie)	31.7 C (89.1 F)	tie	12 years	1 of 100 (Routine)
16 August 2012	San Bruno, MX	daily rain	13.0 mm (0.5 in)	13.0 mm (0.5 in)	39 years	17 of 100 (Routine)
15 August 2012	San Bruno, MX	daily high max	40.0 C (104.0 F)	1.1 C (2.0 F)	7 years	10 of 100 (Routine)
15 August 2012	San Bruno, MX	daily low min (Tie)	15.6 C (60.1 F)	tie	24 years	2 of 100 (Routine)
14 August 2012	San Bruno, MX	daily rain	15.7 mm (0.6 in)	5.8 mm (0.23 in)	2 years	5 of 100 (Routine)
14 August 2012	San Bruno, MX	daily high min (Tie)	26.7 C (80.1 F)	tie	27 years	3 of 100 (Routine)
11 August 2012	San Bruno, MX	daily high min	28.9 C (84.0 F)	1.1 C (2.0 F)	12 years	10 of 100 (Routine)
10 August 2012	San Bruno, MX	daily high min (Tie)	27.8 C (82.0 F)	tie	12 years	1 of 100 (Routine)
4 August 2012	San Bruno, MX	daily high min (Tie)	25.6 C (78.1 F)	tie	38 years	3 of 100 (Routine)

Climate Trend

25 complete years, 1974 to 2009

One stripe for each of 25 complete years at San Bruno, 1974 to 2009. Blue stripes are years cooler than the station's own mean of 21.2 C (70.2 F); red stripes are warmer. The coolest year was 2007, at 20.0 C (68.0 F), and the warmest was 1981, at 22.4 C (72.3 F). The strongest colour marks a difference of 1.3 C (2.3 F).

Annual mean temperature at San Bruno as warming stripes, 1974 to 2009
Year	Annual mean temperature	Difference from the station mean
1974	21.2 C	-0.07 C
1975	20.3 C	-0.98 C
1976	20.9 C	-0.35 C
1977	21.2 C	-0.05 C
1978	21.6 C	+0.32 C
1979	21.0 C	-0.21 C
1980	22.3 C	+1.05 C
1981	22.4 C	+1.18 C
1982	21.5 C	+0.22 C
1983	21.1 C	-0.15 C
1984	21.5 C	+0.27 C
1985	21.1 C	-0.17 C
1987	21.3 C	+0.02 C
1988	20.9 C	-0.32 C
1989	22.0 C	+0.72 C
2000	21.3 C	+0.05 C
2001	21.2 C	+0.01 C
2002	20.7 C	-0.50 C
2003	21.7 C	+0.45 C
2004	22.2 C	+0.99 C
2005	20.6 C	-0.62 C
2006	21.0 C	-0.26 C
2007	20.0 C	-1.22 C
2008	21.0 C	-0.22 C
2009	21.1 C	-0.10 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

1973 to 2012

Yearly extremes at San Bruno: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	45.6 C (114.1 F)	2006	39.4 C (102.9 F)	35
Coldest night (TNn)	0.0 C (32.0 F)	2000	3.9 C (39.0 F)	35
Wettest day (Rx1day)	190.0 mm (7.5 in)	1983	39.9 mm (1.6 in)	35
Wettest five days (Rx5day)	238.7 mm (9.4 in)	1979	45.0 mm (1.8 in)	35
Longest dry spell (CDD)	316 days	1989	167 days	35

Hottest day (TXx)

The hottest day of the year at San Bruno, 1973 to 2012. The record is 45.6 C (114.1 F) in 2006, marked on the chart; the median year is 39.4 C (102.9 F).

Hottest day (TXx) at San Bruno by year
Year	Hottest day (TXx)
1973	38.9 C (102.0 F)
1974	38.9 C (102.0 F)
1975	40.0 C (104.0 F)
1976	40.0 C (104.0 F)
1977	38.9 C (102.0 F)
1978	37.8 C (100.0 F)
1979	39.4 C (102.9 F)
1980	39.4 C (102.9 F)
1981	38.9 C (102.0 F)
1982	37.8 C (100.0 F)
1983	38.9 C (102.0 F)
1984	39.4 C (102.9 F)
1985	38.9 C (102.0 F)
1986	39.4 C (102.9 F)
1987	40.0 C (104.0 F)
1988	38.9 C (102.0 F)
1989	38.3 C (100.9 F)
1990	39.4 C (102.9 F)
1991	31.7 C (89.1 F)
1992	41.7 C (107.1 F)
1993	40.0 C (104.0 F)
1997	42.8 C (109.0 F)
2000	38.9 C (102.0 F)
2001	40.0 C (104.0 F)
2002	38.9 C (102.0 F)
2003	45.0 C (113.0 F)
2004	41.7 C (107.1 F)
2005	38.9 C (102.0 F)
2006	45.6 C (114.1 F)
2007	38.9 C (102.0 F)
2008	38.9 C (102.0 F)
2009	39.4 C (102.9 F)
2010	37.8 C (100.0 F)
2011	41.7 C (107.1 F)
2012	40.0 C (104.0 F)

Coldest night (TNn)

The coldest night of the year at San Bruno, 1973 to 2012. The record is 0.0 C (32.0 F) in 2000, marked on the chart; the median year is 3.9 C (39.0 F).

Coldest night (TNn) at San Bruno by year
Year	Coldest night (TNn)
1973	5.0 C (41.0 F)
1974	1.7 C (35.1 F)
1975	1.7 C (35.1 F)
1976	1.7 C (35.1 F)
1977	5.0 C (41.0 F)
1978	3.9 C (39.0 F)
1979	1.7 C (35.1 F)
1980	2.8 C (37.0 F)
1981	5.0 C (41.0 F)
1982	5.0 C (41.0 F)
1983	5.0 C (41.0 F)
1984	3.9 C (39.0 F)
1985	1.7 C (35.1 F)
1986	3.9 C (39.0 F)
1987	1.7 C (35.1 F)
1988	3.9 C (39.0 F)
1989	1.7 C (35.1 F)
1990	1.7 C (35.1 F)
1991	3.9 C (39.0 F)
1992	5.0 C (41.0 F)
1993	5.0 C (41.0 F)
1997	6.1 C (43.0 F)
2000	0.0 C (32.0 F)
2001	3.9 C (39.0 F)
2002	2.8 C (37.0 F)
2003	1.7 C (35.1 F)
2004	5.0 C (41.0 F)
2005	5.0 C (41.0 F)
2006	3.9 C (39.0 F)
2007	2.8 C (37.0 F)
2008	2.8 C (37.0 F)
2009	2.2 C (36.0 F)
2010	2.8 C (37.0 F)
2011	3.9 C (39.0 F)
2012	5.6 C (42.1 F)

Wettest day (Rx1day)

The wettest day of the year at San Bruno, 1973 to 2012. The record is 190.0 mm (7.5 in) in 1983, marked on the chart; the median year is 39.9 mm (1.6 in).

Wettest day (Rx1day) at San Bruno by year
Year	Wettest day (Rx1day)
1973	13.5 mm (0.5 in)
1974	24.9 mm (1.0 in)
1975	64.8 mm (2.6 in)
1976	82.8 mm (3.3 in)
1977	46.0 mm (1.8 in)
1978	110.0 mm (4.3 in)
1979	84.8 mm (3.3 in)
1980	25.9 mm (1.0 in)
1981	140.0 mm (5.5 in)
1982	99.8 mm (3.9 in)
1983	190.0 mm (7.5 in)
1984	32.8 mm (1.3 in)
1985	39.9 mm (1.6 in)
1986	2.8 mm (0.11 in)
1987	45.0 mm (1.8 in)
1988	33.3 mm (1.3 in)
1989	30.0 mm (1.2 in)
1990	78.0 mm (3.1 in)
1991	26.9 mm (1.1 in)
1992	73.9 mm (2.9 in)
1993	47.8 mm (1.9 in)
1997	79.8 mm (3.1 in)
2000	36.6 mm (1.4 in)
2001	66.8 mm (2.6 in)
2002	35.8 mm (1.4 in)
2003	31.0 mm (1.2 in)
2004	30.0 mm (1.2 in)
2005	32.8 mm (1.3 in)
2006	159.8 mm (6.3 in)
2007	14.0 mm (0.6 in)
2008	189.0 mm (7.4 in)
2009	99.8 mm (3.9 in)
2010	27.9 mm (1.1 in)
2011	30.0 mm (1.2 in)
2012	15.7 mm (0.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at San Bruno, 1973 to 2012. The record is 238.7 mm (9.4 in) in 1979, marked on the chart; the median year is 45.0 mm (1.8 in).

Wettest five days (Rx5day) at San Bruno by year
Year	Wettest five days (Rx5day)
1973	13.5 mm (0.5 in)
1974	35.8 mm (1.4 in)
1975	126.5 mm (5.0 in)
1976	129.5 mm (5.1 in)
1977	46.0 mm (1.8 in)
1978	201.9 mm (7.9 in)
1979	238.7 mm (9.4 in)
1980	31.7 mm (1.2 in)
1981	140.0 mm (5.5 in)
1982	99.8 mm (3.9 in)
1983	190.0 mm (7.5 in)
1984	32.8 mm (1.3 in)
1985	39.9 mm (1.6 in)
1986	2.8 mm (0.11 in)
1987	45.0 mm (1.8 in)
1988	36.6 mm (1.4 in)
1989	43.8 mm (1.7 in)
1990	101.4 mm (4.0 in)
1991	28.0 mm (1.1 in)
1992	86.1 mm (3.4 in)
1993	47.8 mm (1.9 in)
1997	79.8 mm (3.1 in)
2000	36.6 mm (1.4 in)
2001	70.6 mm (2.8 in)
2002	41.4 mm (1.6 in)
2003	31.8 mm (1.3 in)
2004	45.0 mm (1.8 in)
2005	32.8 mm (1.3 in)
2006	159.8 mm (6.3 in)
2007	21.2 mm (0.8 in)
2008	189.0 mm (7.4 in)
2009	172.5 mm (6.8 in)
2010	27.9 mm (1.1 in)
2011	40.9 mm (1.6 in)
2012	28.7 mm (1.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at San Bruno, 1973 to 2012. The record is 316 days in 1989, marked on the chart; the median year is 167 days.

Longest dry spell (CDD) at San Bruno by year
Year	Longest dry spell (CDD)
1973	141 days
1974	233 days
1975	167 days
1976	164 days
1977	276 days
1978	147 days
1979	233 days
1980	168 days
1981	84 days
1982	172 days
1983	107 days
1984	166 days
1985	165 days
1986	243 days
1987	210 days
1988	230 days
1989	316 days
1990	150 days
1991	91 days
1992	135 days
1993	176 days
1997	38 days
2000	146 days
2001	182 days
2002	159 days
2003	207 days
2004	247 days
2005	163 days
2006	244 days
2007	104 days
2008	236 days
2009	164 days
2010	192 days
2011	153 days
2012	181 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.

Download the Data

Data for San Bruno standing records by year: CSV or JSON. Field meanings are on the data page.
Data for San Bruno 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).