San Ramon Weather Records (MXN00003130)

Record envelope, standing records and threshold days for San Ramon (MXN00003130), Mexico, with 33 years of record.

Key Facts for San Ramon

San Ramon (MXN00003130) is a weather station in Mexico at 25.27 latitude and -111.28 longitude, 230 m (754 ft) above sea level.
The station reports from 1980 to 2012, 33 years of record.
1,464 records set at San Ramon still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
San Ramon set a daily record low minimum temperature of 7.8 C (46.0 F) on 20 June 2012.

About the Station

Location: Mexico, 25.27 latitude, -111.28 longitude.
Elevation: 230 m (754 ft).
Period of record: 1980 to 2012, 33 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 Ramon. 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 Ramon, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	37.2 C (99.0 F)	-1.1 C (30.0 F)	n/a	n/a
Feb	38.9 C (102.0 F)	0.0 C (32.0 F)	n/a	n/a
Mar	41.1 C (106.0 F)	1.7 C (35.1 F)	n/a	n/a
Apr	43.9 C (111.0 F)	2.8 C (37.0 F)	n/a	n/a
May	45.0 C (113.0 F)	2.8 C (37.0 F)	n/a	n/a
Jun	46.1 C (115.0 F)	3.9 C (39.0 F)	n/a	n/a
Jul	45.0 C (113.0 F)	5.0 C (41.0 F)	n/a	n/a
Aug	45.0 C (113.0 F)	8.3 C (46.9 F)	n/a	n/a
Sep	45.0 C (113.0 F)	5.6 C (42.1 F)	n/a	n/a
Oct	42.8 C (109.0 F)	3.9 C (39.0 F)	n/a	n/a
Nov	39.4 C (102.9 F)	0.0 C (32.0 F)	n/a	n/a
Dec	39.4 C (102.9 F)	0.0 C (32.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at San Ramon still stand. 1994 holds the most, with 83.

Standing records at San Ramon by the year they were set
Year set	Standing records
1980	40
1981	29
1982	39
1983	42
1984	69
1985	56
1986	68
1987	61
1988	48
1989	37
1990	34
1991	75
1992	10
1993	10
1994	83
1996	28
1997	62
1998	31
1999	45
2000	82
2001	45
2002	33
2003	28
2004	46
2005	19
2006	37
2007	62
2008	52
2009	55
2010	60
2011	45
2012	33

Wettest Day of Each Month

Sep: 185.9 mm (7.3 in)

The wettest day on record for each calendar month at San Ramon. The most was 185.9 mm (7.3 in) on 3 September 2006.

Record daily precipitation for each month at San Ramon
Month	Record daily precipitation (mm)	Date
Jan	53.8 mm (2.1 in)	4 January 2005
Feb	29.5 mm (1.2 in)	3 February 1989
Mar	20.3 mm (0.8 in)	2 March 1983
Apr	1.3 mm (0.05 in)	29 April 1986
May	0.0 mm (0.00 in)	1 May 1980
Jun	20.3 mm (0.8 in)	24 June 1984
Jul	72.4 mm (2.9 in)	15 July 1990
Aug	84.3 mm (3.3 in)	15 August 1983
Sep	185.9 mm (7.3 in)	3 September 2006
Oct	88.1 mm (3.5 in)	12 October 2008
Nov	51.8 mm (2.0 in)	12 November 2011
Dec	65.3 mm (2.6 in)	17 December 1989

Period of Record Coverage

1980 to 2012

32 years of record at San Ramon, 1980 to 2012. 4 years have data for under 90 percent of days and are left out of rankings: 1980, 1981, 1982, 2012.

Days with data per year at San Ramon
Year	Days with data	Share of year	Complete
1980	215	59%	No
1981	251	69%	No
1982	304	83%	No
1983	350	96%	Yes
1984	366	100%	Yes
1985	365	100%	Yes
1986	330	90%	Yes
1987	334	92%	Yes
1988	365	100%	Yes
1989	365	100%	Yes
1990	365	100%	Yes
1991	365	100%	Yes
1992	336	92%	Yes
1993	365	100%	Yes
1994	364	100%	Yes
1996	366	100%	Yes
1997	333	91%	Yes
1998	365	100%	Yes
1999	365	100%	Yes
2000	365	100%	Yes
2001	364	100%	Yes
2002	365	100%	Yes
2003	364	100%	Yes
2004	366	100%	Yes
2005	365	100%	Yes
2006	365	100%	Yes
2007	362	99%	Yes
2008	366	100%	Yes
2009	334	92%	Yes
2010	365	100%	Yes
2011	365	100%	Yes
2012	182	50%	No

Latest Records

Latest records at San Ramon
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 June 2012	San Ramon, MX	daily low min	7.8 C (46.0 F)	1.1 C (2.0 F)	11 years	9 of 100 (Routine)
19 June 2012	San Ramon, MX	daily low min	5.0 C (41.0 F)	0.6 C (1.1 F)	11 years	7 of 100 (Routine)
18 June 2012	San Ramon, MX	daily low min	5.6 C (42.1 F)	2.2 C (4.0 F)	11 years	12 of 100 (Routine)
17 June 2012	San Ramon, MX	daily low min	8.9 C (48.0 F)	1.1 C (2.0 F)	11 years	9 of 100 (Routine)
16 June 2012	San Ramon, MX	daily low min	7.8 C (46.0 F)	2.2 C (4.0 F)	9 years	11 of 100 (Routine)
8 June 2012	San Ramon, MX	daily low min	6.7 C (44.1 F)	3.3 C (5.9 F)	8 years	15 of 100 (Routine)
7 June 2012	San Ramon, MX	daily low min (Tie)	5.6 C (42.1 F)	tie	30 years	3 of 100 (Routine)
6 June 2012	San Ramon, MX	daily low min	5.0 C (41.0 F)	2.2 C (4.0 F)	30 years	18 of 100 (Routine)
2 June 2012	San Ramon, MX	daily low min (Tie)	7.8 C (46.0 F)	tie	5 years	1 of 100 (Routine)
1 June 2012	San Ramon, MX	daily low min	5.0 C (41.0 F)	2.8 C (5.0 F)	3 years	11 of 100 (Routine)
31 May 2012	San Ramon, MX	daily low min (Tie)	5.6 C (42.1 F)	tie	1 year	0 of 100 (Routine)
30 May 2012	San Ramon, MX	daily low min (Tie)	5.0 C (41.0 F)	tie	2 years	0 of 100 (Routine)
28 May 2012	San Ramon, MX	daily low min	5.0 C (41.0 F)	1.7 C (3.1 F)	5 years	9 of 100 (Routine)
26 May 2012	San Ramon, MX	daily low min (Tie)	6.7 C (44.1 F)	tie	11 years	1 of 100 (Routine)
20 May 2012	San Ramon, MX	daily low min	5.6 C (42.1 F)	1.1 C (2.0 F)	3 years	6 of 100 (Routine)
17 May 2012	San Ramon, MX	daily low min (Tie)	5.6 C (42.1 F)	tie	3 years	0 of 100 (Routine)
16 May 2012	San Ramon, MX	monthly low min	2.8 C (37.0 F)	1.1 C (2.0 F)	3 years	16 of 100 (Routine)
2 May 2012	San Ramon, MX	daily low min (Tie)	5.6 C (42.1 F)	tie	3 years	0 of 100 (Routine)
28 April 2012	San Ramon, MX	daily low min	5.0 C (41.0 F)	0.6 C (1.1 F)	25 years	12 of 100 (Routine)
19 April 2012	San Ramon, MX	daily low min	5.0 C (41.0 F)	0.6 C (1.1 F)	11 years	8 of 100 (Routine)

Climate Trend

22 complete years, 1984 to 2011

One stripe for each of 22 complete years at San Ramon, 1984 to 2011. Blue stripes are years cooler than the station's own mean of 22.4 C (72.2 F); red stripes are warmer. The coolest year was 2007, at 20.3 C (68.6 F), and the warmest was 1991, at 24.7 C (76.4 F). The strongest colour marks a difference of 2.4 C (4.3 F).

Annual mean temperature at San Ramon as warming stripes, 1984 to 2011
Year	Annual mean temperature	Difference from the station mean
1984	23.0 C	+0.65 C
1985	23.6 C	+1.19 C
1988	23.5 C	+1.14 C
1989	22.9 C	+0.55 C
1990	23.5 C	+1.09 C
1991	24.7 C	+2.32 C
1993	22.5 C	+0.16 C
1994	24.3 C	+1.98 C
1996	23.5 C	+1.12 C
1998	23.0 C	+0.59 C
1999	21.9 C	-0.46 C
2000	20.8 C	-1.57 C
2001	21.3 C	-1.07 C
2002	21.8 C	-0.61 C
2003	21.9 C	-0.48 C
2004	22.3 C	-0.04 C
2005	22.7 C	+0.32 C
2006	21.6 C	-0.78 C
2007	20.3 C	-2.05 C
2008	21.4 C	-1.00 C
2010	20.6 C	-1.74 C
2011	21.0 C	-1.35 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

1980 to 2012

Yearly extremes at San Ramon: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	46.1 C (115.0 F)	1983	42.2 C (108.0 F)	32
Coldest night (TNn)	-1.1 C (30.0 F)	2000	2.8 C (37.0 F)	32
Wettest day (Rx1day)	185.9 mm (7.3 in)	2006	43.4 mm (1.7 in)	33
Wettest five days (Rx5day)	223.7 mm (8.8 in)	2006	65.3 mm (2.6 in)	33
Longest dry spell (CDD)	209 days	2002	155 days	33

Hottest day (TXx)

The hottest day of the year at San Ramon, 1980 to 2012. The record is 46.1 C (115.0 F) in 1983, marked on the chart; the median year is 42.2 C (108.0 F).

Hottest day (TXx) at San Ramon by year
Year	Hottest day (TXx)
1980	43.9 C (111.0 F)
1981	43.9 C (111.0 F)
1982	45.0 C (113.0 F)
1983	46.1 C (115.0 F)
1984	44.4 C (111.9 F)
1985	45.0 C (113.0 F)
1986	45.0 C (113.0 F)
1987	43.9 C (111.0 F)
1988	42.2 C (108.0 F)
1989	40.0 C (104.0 F)
1990	42.2 C (108.0 F)
1991	42.2 C (108.0 F)
1992	41.7 C (107.1 F)
1993	42.2 C (108.0 F)
1994	41.1 C (106.0 F)
1995	n/a
1996	41.7 C (107.1 F)
1997	42.2 C (108.0 F)
1998	43.9 C (111.0 F)
1999	43.9 C (111.0 F)
2000	41.7 C (107.1 F)
2001	42.8 C (109.0 F)
2002	41.7 C (107.1 F)
2003	41.7 C (107.1 F)
2004	40.6 C (105.1 F)
2005	41.7 C (107.1 F)
2006	41.7 C (107.1 F)
2007	40.6 C (105.1 F)
2008	40.6 C (105.1 F)
2009	41.7 C (107.1 F)
2010	41.7 C (107.1 F)
2011	43.9 C (111.0 F)
2012	40.0 C (104.0 F)

Coldest night (TNn)

The coldest night of the year at San Ramon, 1980 to 2012. The record is -1.1 C (30.0 F) in 2000, marked on the chart; the median year is 2.8 C (37.0 F).

Coldest night (TNn) at San Ramon by year
Year	Coldest night (TNn)
1980	4.4 C (39.9 F)
1981	5.0 C (41.0 F)
1982	5.0 C (41.0 F)
1983	2.8 C (37.0 F)
1984	4.4 C (39.9 F)
1985	2.2 C (36.0 F)
1986	5.0 C (41.0 F)
1987	3.9 C (39.0 F)
1988	5.0 C (41.0 F)
1989	2.2 C (36.0 F)
1990	5.0 C (41.0 F)
1991	5.0 C (41.0 F)
1992	5.6 C (42.1 F)
1993	5.6 C (42.1 F)
1994	8.3 C (46.9 F)
1995	n/a
1996	4.4 C (39.9 F)
1997	3.9 C (39.0 F)
1998	1.7 C (35.1 F)
1999	0.0 C (32.0 F)
2000	-1.1 C (30.0 F)
2001	2.8 C (37.0 F)
2002	3.9 C (39.0 F)
2003	0.0 C (32.0 F)
2004	0.0 C (32.0 F)
2005	0.0 C (32.0 F)
2006	0.0 C (32.0 F)
2007	0.6 C (33.1 F)
2008	0.0 C (32.0 F)
2009	0.0 C (32.0 F)
2010	0.0 C (32.0 F)
2011	1.7 C (35.1 F)
2012	1.7 C (35.1 F)

Wettest day (Rx1day)

The wettest day of the year at San Ramon, 1980 to 2012. The record is 185.9 mm (7.3 in) in 2006, marked on the chart; the median year is 43.4 mm (1.7 in).

Wettest day (Rx1day) at San Ramon by year
Year	Wettest day (Rx1day)
1980	41.9 mm (1.6 in)
1981	39.9 mm (1.6 in)
1982	52.8 mm (2.1 in)
1983	84.3 mm (3.3 in)
1984	37.3 mm (1.5 in)
1985	27.4 mm (1.1 in)
1986	60.5 mm (2.4 in)
1987	30.5 mm (1.2 in)
1988	55.4 mm (2.2 in)
1989	65.3 mm (2.6 in)
1990	72.4 mm (2.9 in)
1991	62.5 mm (2.5 in)
1992	39.9 mm (1.6 in)
1993	52.8 mm (2.1 in)
1994	25.4 mm (1.0 in)
1995	77.5 mm (3.1 in)
1996	23.9 mm (0.9 in)
1997	43.4 mm (1.7 in)
1998	25.9 mm (1.0 in)
1999	23.9 mm (0.9 in)
2000	32.8 mm (1.3 in)
2001	81.8 mm (3.2 in)
2002	42.9 mm (1.7 in)
2003	95.0 mm (3.7 in)
2004	21.8 mm (0.9 in)
2005	53.8 mm (2.1 in)
2006	185.9 mm (7.3 in)
2007	39.9 mm (1.6 in)
2008	88.1 mm (3.5 in)
2009	68.8 mm (2.7 in)
2010	19.8 mm (0.8 in)
2011	51.8 mm (2.0 in)
2012	6.9 mm (0.27 in)

Wettest five days (Rx5day)

The wettest five days of the year at San Ramon, 1980 to 2012. The record is 223.7 mm (8.8 in) in 2006, marked on the chart; the median year is 65.3 mm (2.6 in).

Wettest five days (Rx5day) at San Ramon by year
Year	Wettest five days (Rx5day)
1980	62.7 mm (2.5 in)
1981	75.4 mm (3.0 in)
1982	52.8 mm (2.1 in)
1983	148.3 mm (5.8 in)
1984	41.9 mm (1.6 in)
1985	47.5 mm (1.9 in)
1986	67.9 mm (2.7 in)
1987	40.1 mm (1.6 in)
1988	55.4 mm (2.2 in)
1989	65.3 mm (2.6 in)
1990	133.1 mm (5.2 in)
1991	66.8 mm (2.6 in)
1992	61.2 mm (2.4 in)
1993	69.1 mm (2.7 in)
1994	36.9 mm (1.5 in)
1995	121.5 mm (4.8 in)
1996	76.2 mm (3.0 in)
1997	90.4 mm (3.6 in)
1998	34.5 mm (1.4 in)
1999	56.2 mm (2.2 in)
2000	46.7 mm (1.8 in)
2001	203.5 mm (8.0 in)
2002	57.6 mm (2.3 in)
2003	132.9 mm (5.2 in)
2004	67.3 mm (2.6 in)
2005	66.8 mm (2.6 in)
2006	223.7 mm (8.8 in)
2007	39.9 mm (1.6 in)
2008	98.7 mm (3.9 in)
2009	132.5 mm (5.2 in)
2010	25.6 mm (1.0 in)
2011	51.8 mm (2.0 in)
2012	6.9 mm (0.27 in)

Longest dry spell (CDD)

The longest dry spell of the year at San Ramon, 1980 to 2012. The record is 209 days in 2002, marked on the chart; the median year is 155 days.

Longest dry spell (CDD) at San Ramon by year
Year	Longest dry spell (CDD)
1980	93 days
1981	111 days
1982	166 days
1983	115 days
1984	146 days
1985	171 days
1986	118 days
1987	197 days
1988	201 days
1989	142 days
1990	192 days
1991	163 days
1992	100 days
1993	170 days
1994	121 days
1995	172 days
1996	145 days
1997	91 days
1998	151 days
1999	173 days
2000	145 days
2001	207 days
2002	209 days
2003	148 days
2004	142 days
2005	137 days
2006	204 days
2007	169 days
2008	197 days
2009	175 days
2010	155 days
2011	186 days
2012	142 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

31 years, 1981 to 2011

A day with at least 46.6 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 174.5 mm (6.9 in) of rain is expected about once in 100 years.

Rainfall return levels at San Ramon: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	46.6 mm (1.8 in)
5 years	72.5 mm (2.9 in)
10 years	92.6 mm (3.6 in)
25 years	121.8 mm (4.8 in)
50 years	146.7 mm (5.8 in)	Longer than the 31 years of record
100 years	174.5 mm (6.9 in)	Longer than the 31 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, 31 years of values from 1981 to 2011.

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: 185.9 mm (7.3 in) in 2006; 95.0 mm (3.7 in) in 2003; 88.1 mm (3.5 in) in 2008.

Download the Data

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