San Francisco (Smn) Weather Records (MXN00032049)

Record envelope, standing records and threshold days for San Francisco (Smn) (MXN00032049), Mexico, with 69 years of record.

Key Facts for San Francisco (Smn)

San Francisco (Smn) (MXN00032049) is a weather station in Mexico at 24.32 latitude and -102.88 longitude, 1,680 m (5,511 ft) above sea level.
The station reports from 1944 to 2012, 69 years of record.
1,464 records set at San Francisco (Smn) still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
San Francisco (Smn) set a daily record precipitation of 21.3 mm (0.8 in) on 14 October 2012.

About the Station

Location: Mexico, 24.32 latitude, -102.88 longitude.
Elevation: 1,680 m (5,511 ft).
Period of record: 1944 to 2012, 69 years.
Eligible elements: 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 Francisco (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 San Francisco (Smn), with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	30.0 C (86.0 F)	-10.0 C (14.0 F)	n/a	n/a
Feb	32.8 C (91.0 F)	-10.0 C (14.0 F)	n/a	n/a
Mar	37.8 C (100.0 F)	-6.1 C (21.0 F)	n/a	n/a
Apr	36.7 C (98.1 F)	-1.7 C (28.9 F)	n/a	n/a
May	40.0 C (104.0 F)	3.3 C (37.9 F)	n/a	n/a
Jun	40.0 C (104.0 F)	8.9 C (48.0 F)	n/a	n/a
Jul	36.7 C (98.1 F)	10.6 C (51.1 F)	n/a	n/a
Aug	35.6 C (96.1 F)	9.4 C (48.9 F)	n/a	n/a
Sep	35.0 C (95.0 F)	1.1 C (34.0 F)	n/a	n/a
Oct	35.0 C (95.0 F)	-1.1 C (30.0 F)	n/a	n/a
Nov	31.7 C (89.1 F)	-11.1 C (12.0 F)	n/a	n/a
Dec	30.0 C (86.0 F)	-11.1 C (12.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at San Francisco (Smn) still stand. 1998 holds the most, with 144.

Standing records at San Francisco (Smn) by the year they were set
Year set	Standing records
1989	99
1990	80
1991	80
1992	117
1993	78
1994	69
1995	62
1996	73
1997	97
1998	144
1999	83
2000	74
2001	63
2002	44
2009	66
2010	95
2011	76
2012	64

Wettest Day of Each Month

Jul: 77.5 mm (3.1 in)

The wettest day on record for each calendar month at San Francisco (Smn). The most was 77.5 mm (3.1 in) on 8 July 1973.

Record daily precipitation for each month at San Francisco (Smn)
Month	Record daily precipitation (mm)	Date
Jan	33.8 mm (1.3 in)	11 January 1987
Feb	30.0 mm (1.2 in)	22 February 1953
Mar	17.8 mm (0.7 in)	3 March 1968
Apr	31.8 mm (1.3 in)	30 April 1968
May	47.5 mm (1.9 in)	15 May 1956
Jun	67.8 mm (2.7 in)	25 June 1996
Jul	77.5 mm (3.1 in)	8 July 1973
Aug	72.9 mm (2.9 in)	21 August 1989
Sep	53.3 mm (2.1 in)	29 September 1976
Oct	39.9 mm (1.6 in)	3 October 1996
Nov	26.9 mm (1.1 in)	17 November 1976
Dec	31.8 mm (1.3 in)	2 December 1965

Period of Record Coverage

1989 to 2012

18 years of record at San Francisco (Smn), 1989 to 2012. 2 years have data for under 90 percent of days and are left out of rankings: 1989, 2002.

Days with data per year at San Francisco (Smn)
Year	Days with data	Share of year	Complete
1989	274	75%	No
1990	334	92%	Yes
1991	365	100%	Yes
1992	366	100%	Yes
1993	365	100%	Yes
1994	334	92%	Yes
1995	332	91%	Yes
1996	366	100%	Yes
1997	363	99%	Yes
1998	365	100%	Yes
1999	365	100%	Yes
2000	365	100%	Yes
2001	365	100%	Yes
2002	212	58%	No
2009	362	99%	Yes
2010	365	100%	Yes
2011	365	100%	Yes
2012	366	100%	Yes

Latest Records

Latest records at San Francisco (Smn)
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
14 October 2012	San Francisco (Smn), MX	daily rain	21.3 mm (0.8 in)	5.8 mm (0.23 in)	46 years	20 of 100 (Routine)
15 September 2012	San Francisco (Smn), MX	daily rain	33.3 mm (1.3 in)	5.9 mm (0.23 in)	39 years	24 of 100 (Routine)
3 September 2012	San Francisco (Smn), MX	daily rain	33.8 mm (1.3 in)	7.9 mm (0.31 in)	44 years	28 of 100 (Routine)
18 July 2012	San Francisco (Smn), MX	daily rain	17.8 mm (0.7 in)	2.8 mm (0.11 in)	53 years	20 of 100 (Routine)
2 July 2012	San Francisco (Smn), MX	daily rain	30.5 mm (1.2 in)	11.7 mm (0.5 in)	56 years	35 of 100 (Notable)
9 April 2012	San Francisco (Smn), MX	daily rain	9.1 mm (0.36 in)	9.1 mm (0.36 in)	67 years	20 of 100 (Routine)
9 February 2012	San Francisco (Smn), MX	daily rain	2.0 mm (0.08 in)	2.0 mm (0.08 in)	66 years	20 of 100 (Routine)
8 February 2012	San Francisco (Smn), MX	daily rain	0.5 mm (0.02 in)	0.5 mm (0.02 in)	66 years	20 of 100 (Routine)
5 February 2012	San Francisco (Smn), MX	daily rain	3.8 mm (0.15 in)	1.5 mm (0.06 in)	28 years	16 of 100 (Routine)
29 January 2012	San Francisco (Smn), MX	daily rain	16.8 mm (0.7 in)	15.5 mm (0.6 in)	48 years	20 of 100 (Routine)
5 August 2011	San Francisco (Smn), MX	daily rain	46.0 mm (1.8 in)	31.5 mm (1.2 in)	14 years	43 of 100 (Notable)
25 September 2010	San Francisco (Smn), MX	daily rain	12.2 mm (0.5 in)	6.4 mm (0.25 in)	36 years	20 of 100 (Routine)
1 July 2010	San Francisco (Smn), MX	daily rain	25.1 mm (1.0 in)	0.2 mm (0.01 in)	61 years	24 of 100 (Routine)
9 May 2010	San Francisco (Smn), MX	daily rain	20.3 mm (0.8 in)	8.4 mm (0.33 in)	64 years	20 of 100 (Routine)
6 March 2010	San Francisco (Smn), MX	daily rain	1.0 mm (0.04 in)	1.0 mm (0.04 in)	64 years	20 of 100 (Routine)
18 February 2010	San Francisco (Smn), MX	daily rain	5.6 mm (0.22 in)	5.3 mm (0.21 in)	42 years	20 of 100 (Routine)
2 February 2010	San Francisco (Smn), MX	daily rain	12.7 mm (0.5 in)	10.4 mm (0.4 in)	24 years	20 of 100 (Routine)
28 December 2009	San Francisco (Smn), MX	daily rain	2.8 mm (0.11 in)	1.5 mm (0.06 in)	56 years	20 of 100 (Routine)
26 November 2009	San Francisco (Smn), MX	daily rain	8.6 mm (0.34 in)	5.8 mm (0.23 in)	51 years	20 of 100 (Routine)
31 August 2009	San Francisco (Smn), MX	daily rain	24.9 mm (1.0 in)	7.1 mm (0.28 in)	63 years	20 of 100 (Routine)

Climate Trend

13 complete years, 1991 to 2012

One stripe for each of 13 complete years at San Francisco (Smn), 1991 to 2012. Blue stripes are years cooler than the station's own mean of 18.7 C (65.7 F); red stripes are warmer. The coolest year was 1992, at 18.0 C (64.4 F), and the warmest was 1998, at 19.6 C (67.2 F). The strongest colour marks a difference of 0.9 C (1.6 F).

Annual mean temperature at San Francisco (Smn) as warming stripes, 1991 to 2012
Year	Annual mean temperature	Difference from the station mean
1991	18.2 C	-0.51 C
1992	18.0 C	-0.74 C
1993	18.6 C	-0.14 C
1996	18.7 C	-0.08 C
1997	18.3 C	-0.44 C
1998	19.6 C	+0.85 C
1999	18.4 C	-0.37 C
2000	18.6 C	-0.14 C
2001	19.0 C	+0.23 C
2009	19.2 C	+0.47 C
2010	18.3 C	-0.47 C
2011	19.5 C	+0.72 C
2012	19.4 C	+0.62 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 2012

Yearly extremes at San Francisco (Smn): the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	40.0 C (104.0 F)	1989	37.8 C (100.0 F)	18
Coldest night (TNn)	-11.1 C (12.0 F)	1997	-7.2 C (19.0 F)	18
Wettest day (Rx1day)	77.5 mm (3.1 in)	1973	36.3 mm (1.4 in)	62
Wettest five days (Rx5day)	121.7 mm (4.8 in)	1959	61.9 mm (2.4 in)	62
Longest dry spell (CDD)	171 days	1969	75 days	62

Hottest day (TXx)

The hottest day of the year at San Francisco (Smn), 1944 to 2012. The record is 40.0 C (104.0 F) in 1989, marked on the chart; the median year is 37.8 C (100.0 F).

Hottest day (TXx) at San Francisco (Smn) by year
Year	Hottest day (TXx)
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	40.0 C (104.0 F)
1990	40.0 C (104.0 F)
1991	37.2 C (99.0 F)
1992	37.8 C (100.0 F)
1993	37.8 C (100.0 F)
1994	35.6 C (96.1 F)
1995	38.3 C (100.9 F)
1996	38.9 C (102.0 F)
1997	36.7 C (98.1 F)
1998	37.8 C (100.0 F)
1999	37.8 C (100.0 F)
2000	36.7 C (98.1 F)
2001	36.1 C (97.0 F)
2002	37.2 C (99.0 F)
2009	37.2 C (99.0 F)
2010	37.8 C (100.0 F)
2011	40.0 C (104.0 F)
2012	37.8 C (100.0 F)

Coldest night (TNn)

The coldest night of the year at San Francisco (Smn), 1944 to 2012. The record is -11.1 C (12.0 F) in 1997, marked on the chart; the median year is -7.2 C (19.0 F).

Coldest night (TNn) at San Francisco (Smn) by year
Year	Coldest night (TNn)
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	-7.8 C (18.0 F)
1990	-6.1 C (21.0 F)
1991	-6.7 C (19.9 F)
1992	-6.1 C (21.0 F)
1993	-5.0 C (23.0 F)
1994	-10.0 C (14.0 F)
1995	-4.4 C (24.1 F)
1996	-6.1 C (21.0 F)
1997	-11.1 C (12.0 F)
1998	-7.8 C (18.0 F)
1999	-8.9 C (16.0 F)
2000	-5.0 C (23.0 F)
2001	-10.0 C (14.0 F)
2002	-7.8 C (18.0 F)
2009	-6.1 C (21.0 F)
2010	-8.3 C (17.1 F)
2011	-11.1 C (12.0 F)
2012	-6.7 C (19.9 F)

Wettest day (Rx1day)

The wettest day of the year at San Francisco (Smn), 1944 to 2012. The record is 77.5 mm (3.1 in) in 1973, marked on the chart; the median year is 36.3 mm (1.4 in).

Wettest day (Rx1day) at San Francisco (Smn) by year
Year	Wettest day (Rx1day)
1944	46.5 mm (1.8 in)
1945	24.4 mm (1.0 in)
1946	29.5 mm (1.2 in)
1947	45.0 mm (1.8 in)
1948	65.3 mm (2.6 in)
1949	39.9 mm (1.6 in)
1950	23.9 mm (0.9 in)
1951	45.0 mm (1.8 in)
1952	18.8 mm (0.7 in)
1953	45.0 mm (1.8 in)
1954	15.7 mm (0.6 in)
1955	36.8 mm (1.4 in)
1956	47.5 mm (1.9 in)
1957	33.8 mm (1.3 in)
1958	34.8 mm (1.4 in)
1959	73.9 mm (2.9 in)
1960	25.9 mm (1.0 in)
1961	58.4 mm (2.3 in)
1963	49.8 mm (2.0 in)
1964	40.9 mm (1.6 in)
1965	31.8 mm (1.3 in)
1966	37.8 mm (1.5 in)
1967	32.8 mm (1.3 in)
1968	44.5 mm (1.8 in)
1969	16.8 mm (0.7 in)
1970	36.8 mm (1.4 in)
1971	24.4 mm (1.0 in)
1972	30.0 mm (1.2 in)
1973	77.5 mm (3.1 in)
1974	36.3 mm (1.4 in)
1975	23.4 mm (0.9 in)
1976	53.3 mm (2.1 in)
1977	33.8 mm (1.3 in)
1978	34.8 mm (1.4 in)
1979	24.4 mm (1.0 in)
1980	31.5 mm (1.2 in)
1981	56.9 mm (2.2 in)
1982	31.0 mm (1.2 in)
1983	31.0 mm (1.2 in)
1984	29.5 mm (1.2 in)
1985	42.9 mm (1.7 in)
1986	46.0 mm (1.8 in)
1987	47.0 mm (1.9 in)
1988	36.3 mm (1.4 in)
1989	72.9 mm (2.9 in)
1990	49.8 mm (2.0 in)
1991	24.9 mm (1.0 in)
1992	26.9 mm (1.1 in)
1993	27.4 mm (1.1 in)
1994	29.0 mm (1.1 in)
1995	31.8 mm (1.3 in)
1996	67.8 mm (2.7 in)
1997	42.9 mm (1.7 in)
1998	40.9 mm (1.6 in)
1999	18.8 mm (0.7 in)
2000	54.9 mm (2.2 in)
2001	38.4 mm (1.5 in)
2002	38.4 mm (1.5 in)
2009	24.9 mm (1.0 in)
2010	25.7 mm (1.0 in)
2011	46.0 mm (1.8 in)
2012	33.8 mm (1.3 in)

Wettest five days (Rx5day)

The wettest five days of the year at San Francisco (Smn), 1944 to 2012. The record is 121.7 mm (4.8 in) in 1959, marked on the chart; the median year is 61.9 mm (2.4 in).

Wettest five days (Rx5day) at San Francisco (Smn) by year
Year	Wettest five days (Rx5day)
1944	67.6 mm (2.7 in)
1945	46.8 mm (1.8 in)
1946	60.3 mm (2.4 in)
1947	81.1 mm (3.2 in)
1948	109.3 mm (4.3 in)
1949	62.0 mm (2.4 in)
1950	32.6 mm (1.3 in)
1951	94.3 mm (3.7 in)
1952	35.6 mm (1.4 in)
1953	114.4 mm (4.5 in)
1954	35.8 mm (1.4 in)
1955	78.1 mm (3.1 in)
1956	48.8 mm (1.9 in)
1957	78.0 mm (3.1 in)
1958	53.1 mm (2.1 in)
1959	121.7 mm (4.8 in)
1960	48.8 mm (1.9 in)
1961	66.5 mm (2.6 in)
1963	61.8 mm (2.4 in)
1964	41.2 mm (1.6 in)
1965	72.6 mm (2.9 in)
1966	59.7 mm (2.4 in)
1967	56.9 mm (2.2 in)
1968	60.2 mm (2.4 in)
1969	22.9 mm (0.9 in)
1970	71.1 mm (2.8 in)
1971	54.9 mm (2.2 in)
1972	63.6 mm (2.5 in)
1973	107.7 mm (4.2 in)
1974	54.4 mm (2.1 in)
1975	54.9 mm (2.2 in)
1976	90.7 mm (3.6 in)
1977	62.0 mm (2.4 in)
1978	81.7 mm (3.2 in)
1979	29.2 mm (1.1 in)
1980	50.4 mm (2.0 in)
1981	66.6 mm (2.6 in)
1982	45.5 mm (1.8 in)
1983	62.2 mm (2.4 in)
1984	46.2 mm (1.8 in)
1985	92.5 mm (3.6 in)
1986	66.9 mm (2.6 in)
1987	63.5 mm (2.5 in)
1988	67.3 mm (2.6 in)
1989	106.5 mm (4.2 in)
1990	82.8 mm (3.3 in)
1991	81.8 mm (3.2 in)
1992	40.4 mm (1.6 in)
1993	72.4 mm (2.9 in)
1994	51.6 mm (2.0 in)
1995	37.7 mm (1.5 in)
1996	83.9 mm (3.3 in)
1997	46.2 mm (1.8 in)
1998	102.9 mm (4.1 in)
1999	32.5 mm (1.3 in)
2000	105.5 mm (4.2 in)
2001	61.5 mm (2.4 in)
2002	72.5 mm (2.9 in)
2009	52.9 mm (2.1 in)
2010	45.6 mm (1.8 in)
2011	46.0 mm (1.8 in)
2012	51.4 mm (2.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at San Francisco (Smn), 1944 to 2012. The record is 171 days in 1969, marked on the chart; the median year is 75 days.

Longest dry spell (CDD) at San Francisco (Smn) by year
Year	Longest dry spell (CDD)
1944	43 days
1945	66 days
1946	87 days
1947	109 days
1948	60 days
1949	70 days
1950	88 days
1951	76 days
1952	95 days
1953	93 days
1954	97 days
1955	56 days
1956	120 days
1957	124 days
1958	41 days
1959	44 days
1960	131 days
1961	81 days
1963	84 days
1964	107 days
1965	71 days
1966	48 days
1967	55 days
1968	50 days
1969	171 days
1970	90 days
1971	116 days
1972	86 days
1973	70 days
1974	74 days
1975	114 days
1976	120 days
1977	102 days
1978	64 days
1979	66 days
1980	126 days
1981	51 days
1982	74 days
1983	74 days
1984	98 days
1985	75 days
1986	79 days
1987	59 days
1988	95 days
1989	77 days
1990	77 days
1991	90 days
1992	46 days
1993	70 days
1994	54 days
1995	118 days
1996	71 days
1997	36 days
1998	21 days
1999	40 days
2000	39 days
2001	52 days
2002	30 days
2009	72 days
2010	95 days
2011	171 days
2012	65 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

55 years, 1945 to 2012

A day with at least 35.6 mm (1.4 in) of rain is expected about once in 2 years. A day with at least 88.3 mm (3.5 in) of rain is expected about once in 100 years.

Rainfall return levels at San Francisco (Smn): the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	35.6 mm (1.4 in)
5 years	48.5 mm (1.9 in)
10 years	57.5 mm (2.3 in)
25 years	69.4 mm (2.7 in)
50 years	78.7 mm (3.1 in)
100 years	88.3 mm (3.5 in)	Longer than the 55 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, 55 years of values from 1945 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: 77.5 mm (3.1 in) in 1973; 73.9 mm (2.9 in) in 1959; 72.9 mm (2.9 in) in 1989.

Download the Data

Data for San Francisco (Smn) standing records by year: CSV or JSON. Field meanings are on the data page.
Data for San Francisco (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 2026-10-13 (13 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).