Santo Tomas Weather Records (MXN00002065)

Record envelope, standing records and threshold days for Santo Tomas (MXN00002065), Mexico, with 65 years of record.

Key Facts for Santo Tomas

Santo Tomas (MXN00002065) is a weather station in Mexico at 31.78 latitude and -116.40 longitude, 180 m (590 ft) above sea level.
The station reports from 1948 to 2012, 65 years of record.
1,464 records set at Santo Tomas still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Santo Tomas set a daily record high maximum temperature of 40.0 C (104.0 F) on 31 October 2012.

About the Station

Location: Mexico, 31.78 latitude, -116.40 longitude.
Elevation: 180 m (590 ft).
Period of record: 1948 to 2012, 65 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 Santo Tomas. 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 Santo Tomas, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	35.0 C (95.0 F)	-9.4 C (15.1 F)	n/a	n/a
Feb	35.6 C (96.1 F)	-6.1 C (21.0 F)	n/a	n/a
Mar	40.6 C (105.1 F)	-3.3 C (26.1 F)	n/a	n/a
Apr	45.6 C (114.1 F)	-5.0 C (23.0 F)	n/a	n/a
May	47.8 C (118.0 F)	0.6 C (33.1 F)	n/a	n/a
Jun	51.7 C (125.1 F)	0.6 C (33.1 F)	n/a	n/a
Jul	48.9 C (120.0 F)	0.6 C (33.1 F)	n/a	n/a
Aug	45.6 C (114.1 F)	2.8 C (37.0 F)	n/a	n/a
Sep	48.9 C (120.0 F)	0.0 C (32.0 F)	n/a	n/a
Oct	47.8 C (118.0 F)	0.0 C (32.0 F)	n/a	n/a
Nov	40.6 C (105.1 F)	-7.2 C (19.0 F)	n/a	n/a
Dec	38.9 C (102.0 F)	-7.2 C (19.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Santo Tomas still stand. 1963 holds the most, with 107.

Standing records at Santo Tomas by the year they were set
Year set	Standing records
1948	9
1949	26
1950	35
1951	21
1952	13
1953	39
1954	26
1955	30
1956	24
1957	31
1958	21
1959	21
1960	28
1961	10
1962	25
1963	107
1964	83
1965	28
1966	22
1967	33
1968	10
1969	16
1970	16
1971	32
1972	26
1973	12
1974	18
1975	27
1976	24
1977	30
1978	26
1979	13
1980	30
1981	23
1982	23
1983	13
1984	13
1985	9
1986	17
1987	25
1988	12
1989	17
1990	8
1991	11
1992	8
1993	2
1994	9
1995	12
1996	8
1997	39
1998	8
1999	9
2000	10
2001	4
2002	9
2003	18
2004	31
2005	17
2006	11
2007	21
2008	84
2009	48
2010	18
2011	2
2012	13

All-Time Record Progression

8 new records

8 all-time records were set at Santo Tomas between 24 June 1978 and 27 June 2008. Each dot is a new record.

When Santo Tomas set new all-time records
Date	Kind	Detail
1978-06-24	Record high minimum temperature	Record high minimum temperature 26.7 C (80.1 F)
1978-12-17	Record daily precipitation	Record daily precipitation 75.9 mm (3.0 in)
1991-02-28	Record daily precipitation	Record daily precipitation 97.8 mm (3.9 in)
2007-01-09	Record low minimum temperature	Record low minimum temperature -8.3 C (17.1 F)
2007-01-10	Record low minimum temperature	Record low minimum temperature -9.4 C (15.1 F)
2008-06-24	Record high maximum temperature	Record high maximum temperature 48.9 C (120.0 F)
2008-06-26	Record high maximum temperature	Record high maximum temperature 50.0 C (122.0 F)
2008-06-27	Record high maximum temperature	Record high maximum temperature 51.7 C (125.1 F)

Wettest Day of Each Month

Jan: 97.8 mm (3.9 in)

The wettest day on record for each calendar month at Santo Tomas. The most was 97.8 mm (3.9 in) on 20 January 2010.

Record daily precipitation for each month at Santo Tomas
Month	Record daily precipitation (mm)	Date
Jan	97.8 mm (3.9 in)	20 January 2010
Feb	97.8 mm (3.9 in)	28 February 1991
Mar	53.3 mm (2.1 in)	7 March 1992
Apr	43.9 mm (1.7 in)	15 April 1988
May	14.5 mm (0.6 in)	21 May 2006
Jun	12.2 mm (0.5 in)	24 June 2000
Jul	33.3 mm (1.3 in)	5 July 1962
Aug	22.9 mm (0.9 in)	16 August 1977
Sep	30.0 mm (1.2 in)	9 September 1976
Oct	43.9 mm (1.7 in)	22 October 1956
Nov	49.3 mm (1.9 in)	30 November 2007
Dec	75.9 mm (3.0 in)	17 December 1978

Period of Record Coverage

1948 to 2012

65 years of record at Santo Tomas, 1948 to 2012. 10 years have data for under 90 percent of days and are left out of rankings: 1948, 1963, 1990, 1991, 1992, 1993, 1994, 1995 and others.

Days with data per year at Santo Tomas
Year	Days with data	Share of year	Complete
1948	272	74%	No
1949	365	100%	Yes
1950	365	100%	Yes
1951	365	100%	Yes
1952	366	100%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	365	100%	Yes
1956	366	100%	Yes
1957	364	100%	Yes
1958	365	100%	Yes
1959	360	99%	Yes
1960	365	100%	Yes
1961	365	100%	Yes
1962	364	100%	Yes
1963	327	90%	No
1964	359	98%	Yes
1965	364	100%	Yes
1966	364	100%	Yes
1967	365	100%	Yes
1968	365	100%	Yes
1969	363	99%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	365	100%	Yes
1976	365	100%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	366	100%	Yes
1981	365	100%	Yes
1982	362	99%	Yes
1983	364	100%	Yes
1984	366	100%	Yes
1985	365	100%	Yes
1986	361	99%	Yes
1987	365	100%	Yes
1988	335	92%	Yes
1989	360	99%	Yes
1990	234	64%	No
1991	275	75%	No
1992	311	85%	No
1993	316	87%	No
1994	326	89%	No
1995	315	86%	No
1996	336	92%	Yes
1997	345	95%	Yes
1998	337	92%	Yes
1999	346	95%	Yes
2000	351	96%	Yes
2001	365	100%	Yes
2002	340	93%	Yes
2003	352	96%	Yes
2004	305	83%	No
2005	358	98%	Yes
2006	282	77%	No
2007	331	91%	Yes
2008	333	91%	Yes
2009	357	98%	Yes
2010	361	99%	Yes
2011	365	100%	Yes
2012	330	90%	Yes

Latest Records

Latest records at Santo Tomas
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
31 October 2012	Santo Tomas, MX	daily high max	40.0 C (104.0 F)	2.2 C (4.0 F)	3 years	9 of 100 (Routine)
13 September 2012	Santo Tomas, MX	daily low min	5.6 C (42.1 F)	1.1 C (2.0 F)	18 years	13 of 100 (Routine)
10 September 2012	Santo Tomas, MX	daily low min (Tie)	5.6 C (42.1 F)	tie	48 years	5 of 100 (Routine)
7 September 2012	Santo Tomas, MX	daily low min	5.6 C (42.1 F)	1.1 C (2.0 F)	20 years	14 of 100 (Routine)
6 September 2012	Santo Tomas, MX	daily high max (Tie)	43.9 C (111.0 F)	tie	2 years	1 of 100 (Routine)
4 September 2012	Santo Tomas, MX	daily low min	5.6 C (42.1 F)	1.1 C (2.0 F)	48 years	22 of 100 (Routine)
30 August 2012	Santo Tomas, MX	daily low min	5.6 C (42.1 F)	1.1 C (2.0 F)	49 years	23 of 100 (Routine)
29 August 2012	Santo Tomas, MX	daily low min (Tie)	5.6 C (42.1 F)	tie	48 years	5 of 100 (Routine)
23 August 2012	Santo Tomas, MX	daily low min	7.8 C (46.0 F)	0.5 C (0.9 F)	54 years	23 of 100 (Routine)
17 August 2012	Santo Tomas, MX	daily low min (Tie)	5.6 C (42.1 F)	tie	8 years	2 of 100 (Routine)
15 August 2012	Santo Tomas, MX	daily low min (Tie)	5.0 C (41.0 F)	tie	8 years	2 of 100 (Routine)
14 August 2012	Santo Tomas, MX	daily low min	5.0 C (41.0 F)	1.7 C (3.1 F)	55 years	26 of 100 (Routine)
14 August 2012	Santo Tomas, MX	daily high max (Tie)	42.8 C (109.0 F)	tie	9 years	2 of 100 (Routine)
7 August 2012	Santo Tomas, MX	daily high max (Tie)	42.8 C (109.0 F)	tie	48 years	5 of 100 (Routine)
6 August 2012	Santo Tomas, MX	daily low min (Tie)	6.7 C (44.1 F)	tie	54 years	5 of 100 (Routine)
5 August 2012	Santo Tomas, MX	daily low min	5.6 C (42.1 F)	1.1 C (2.0 F)	49 years	23 of 100 (Routine)
4 August 2012	Santo Tomas, MX	daily low min	5.6 C (42.1 F)	1.1 C (2.0 F)	8 years	11 of 100 (Routine)
3 August 2012	Santo Tomas, MX	daily low min	6.7 C (44.1 F)	1.1 C (2.0 F)	49 years	23 of 100 (Routine)
29 July 2012	Santo Tomas, MX	daily high max	43.9 C (111.0 F)	1.1 C (2.0 F)	58 years	25 of 100 (Routine)
28 July 2012	Santo Tomas, MX	daily low min	5.6 C (42.1 F)	1.1 C (2.0 F)	49 years	23 of 100 (Routine)

Climate Trend

50 complete years, 1949 to 2011

One stripe for each of 50 complete years at Santo Tomas, 1949 to 2011. Blue stripes are years cooler than the station's own mean of 17.6 C (63.6 F); red stripes are warmer. The coolest year was 1973, at 15.9 C (60.6 F), and the warmest was 1996, at 19.0 C (66.1 F). The strongest colour marks a difference of 1.7 C (3.1 F).

Annual mean temperature at Santo Tomas as warming stripes, 1949 to 2011
Year	Annual mean temperature	Difference from the station mean
1949	17.1 C	-0.42 C
1950	18.1 C	+0.51 C
1951	17.5 C	-0.03 C
1952	17.5 C	-0.01 C
1953	18.6 C	+1.02 C
1954	18.1 C	+0.50 C
1955	16.5 C	-1.03 C
1956	17.4 C	-0.18 C
1957	17.8 C	+0.20 C
1958	17.7 C	+0.13 C
1959	18.2 C	+0.63 C
1960	17.8 C	+0.29 C
1961	18.1 C	+0.53 C
1962	17.0 C	-0.55 C
1964	18.4 C	+0.82 C
1965	17.2 C	-0.40 C
1966	17.2 C	-0.33 C
1967	17.0 C	-0.53 C
1968	17.0 C	-0.51 C
1969	16.8 C	-0.71 C
1970	16.9 C	-0.65 C
1971	16.2 C	-1.36 C
1972	17.1 C	-0.43 C
1973	15.9 C	-1.66 C
1974	16.7 C	-0.88 C
1975	16.0 C	-1.55 C
1976	16.9 C	-0.61 C
1977	17.6 C	+0.01 C
1978	17.5 C	-0.03 C
1979	16.9 C	-0.66 C
1980	17.7 C	+0.19 C
1981	18.6 C	+1.00 C
1982	17.2 C	-0.34 C
1983	17.6 C	+0.05 C
1984	18.1 C	+0.56 C
1985	17.2 C	-0.32 C
1986	17.6 C	+0.06 C
1987	17.3 C	-0.27 C
1989	17.6 C	+0.05 C
1994	17.6 C	0.00 C
1995	18.4 C	+0.88 C
1996	19.0 C	+1.41 C
1997	18.8 C	+1.24 C
1999	17.5 C	-0.01 C
2001	18.1 C	+0.52 C
2002	18.2 C	+0.61 C
2003	18.7 C	+1.11 C
2009	18.2 C	+0.66 C
2010	17.9 C	+0.32 C
2011	17.9 C	+0.39 C

The annual mean temperature here has risen by 0.12 C (0.01 to 0.23) per decade over 1949 to 2011. In Fahrenheit: 0.21 F (0.02 to 0.41) per decade. The slope is a straight line fitted to 50 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Santo Tomas
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.12 C (0.01 to 0.23) per decade	0.21 F (0.02 to 0.41) per decade	1949 to 2011	50	Rise
Mean daily maximum	0.24 C (0.01 to 0.46) per decade	0.43 F (0.02 to 0.83) per decade	1949 to 2011	50	Rise
Mean daily minimum	0.00 C (-0.14 to 0.15) per decade	0.00 F (-0.26 to 0.26) per decade	1949 to 2011	50	Not clearly different from zero

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

1948 to 2012

Yearly extremes at Santo Tomas: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	51.7 C (125.1 F)	2008	42.8 C (109.0 F)	65
Coldest night (TNn)	-9.4 C (15.1 F)	2007	-3.3 C (26.1 F)	65
Wettest day (Rx1day)	97.8 mm (3.9 in)	1991	37.3 mm (1.5 in)	65
Wettest five days (Rx5day)	238.3 mm (9.4 in)	2010	59.9 mm (2.4 in)	65
Longest dry spell (CDD)	254 days	1972	143 days	65

Hottest day (TXx)

The hottest day of the year at Santo Tomas, 1948 to 2012. The record is 51.7 C (125.1 F) in 2008, marked on the chart; the median year is 42.8 C (109.0 F).

Hottest day (TXx) at Santo Tomas by year
Year	Hottest day (TXx)
1948	40.6 C (105.1 F)
1949	40.6 C (105.1 F)
1950	40.6 C (105.1 F)
1951	42.8 C (109.0 F)
1952	41.7 C (107.1 F)
1953	46.7 C (116.1 F)
1954	43.9 C (111.0 F)
1955	43.3 C (109.9 F)
1956	40.0 C (104.0 F)
1957	45.0 C (113.0 F)
1958	42.8 C (109.0 F)
1959	42.8 C (109.0 F)
1960	42.8 C (109.0 F)
1961	42.8 C (109.0 F)
1962	40.6 C (105.1 F)
1963	43.9 C (111.0 F)
1964	47.8 C (118.0 F)
1965	38.9 C (102.0 F)
1966	40.6 C (105.1 F)
1967	45.0 C (113.0 F)
1968	41.7 C (107.1 F)
1969	43.9 C (111.0 F)
1970	40.6 C (105.1 F)
1971	45.6 C (114.1 F)
1972	42.8 C (109.0 F)
1973	41.7 C (107.1 F)
1974	42.8 C (109.0 F)
1975	40.6 C (105.1 F)
1976	40.6 C (105.1 F)
1977	40.6 C (105.1 F)
1978	41.7 C (107.1 F)
1979	42.8 C (109.0 F)
1980	42.8 C (109.0 F)
1981	42.8 C (109.0 F)
1982	45.0 C (113.0 F)
1983	40.6 C (105.1 F)
1984	41.7 C (107.1 F)
1985	45.0 C (113.0 F)
1986	41.7 C (107.1 F)
1987	45.0 C (113.0 F)
1988	42.8 C (109.0 F)
1989	41.7 C (107.1 F)
1990	43.9 C (111.0 F)
1991	42.8 C (109.0 F)
1992	43.9 C (111.0 F)
1993	41.7 C (107.1 F)
1994	42.8 C (109.0 F)
1995	41.7 C (107.1 F)
1996	41.7 C (107.1 F)
1997	45.0 C (113.0 F)
1998	43.9 C (111.0 F)
1999	41.7 C (107.1 F)
2000	42.8 C (109.0 F)
2001	41.7 C (107.1 F)
2002	45.6 C (114.1 F)
2003	45.0 C (113.0 F)
2004	45.0 C (113.0 F)
2005	47.8 C (118.0 F)
2006	47.8 C (118.0 F)
2007	45.6 C (114.1 F)
2008	51.7 C (125.1 F)
2009	47.8 C (118.0 F)
2010	47.8 C (118.0 F)
2011	40.6 C (105.1 F)
2012	43.9 C (111.0 F)

Coldest night (TNn)

The coldest night of the year at Santo Tomas, 1948 to 2012. The record is -9.4 C (15.1 F) in 2007, marked on the chart; the median year is -3.3 C (26.1 F).

Coldest night (TNn) at Santo Tomas by year
Year	Coldest night (TNn)
1948	-5.0 C (23.0 F)
1949	-5.0 C (23.0 F)
1950	-6.1 C (21.0 F)
1951	-2.2 C (28.0 F)
1952	-4.4 C (24.1 F)
1953	-6.1 C (21.0 F)
1954	-6.1 C (21.0 F)
1955	-5.0 C (23.0 F)
1956	-3.3 C (26.1 F)
1957	-1.7 C (28.9 F)
1958	-5.0 C (23.0 F)
1959	-1.1 C (30.0 F)
1960	-2.2 C (28.0 F)
1961	-5.0 C (23.0 F)
1962	-3.3 C (26.1 F)
1963	-7.2 C (19.0 F)
1964	-5.0 C (23.0 F)
1965	0.0 C (32.0 F)
1966	-4.4 C (24.1 F)
1967	-4.4 C (24.1 F)
1968	-4.4 C (24.1 F)
1969	-5.0 C (23.0 F)
1970	-7.2 C (19.0 F)
1971	-5.0 C (23.0 F)
1972	-5.0 C (23.0 F)
1973	-3.3 C (26.1 F)
1974	-5.0 C (23.0 F)
1975	-4.4 C (24.1 F)
1976	-5.0 C (23.0 F)
1977	-2.2 C (28.0 F)
1978	-4.4 C (24.1 F)
1979	-3.3 C (26.1 F)
1980	-2.2 C (28.0 F)
1981	-3.3 C (26.1 F)
1982	0.0 C (32.0 F)
1983	-3.3 C (26.1 F)
1984	-1.1 C (30.0 F)
1985	-2.2 C (28.0 F)
1986	-2.2 C (28.0 F)
1987	-5.0 C (23.0 F)
1988	-1.1 C (30.0 F)
1989	-6.1 C (21.0 F)
1990	-3.3 C (26.1 F)
1991	-1.1 C (30.0 F)
1992	-3.3 C (26.1 F)
1993	-3.3 C (26.1 F)
1994	-2.2 C (28.0 F)
1995	0.0 C (32.0 F)
1996	-0.6 C (30.9 F)
1997	-1.1 C (30.0 F)
1998	-3.3 C (26.1 F)
1999	-5.0 C (23.0 F)
2000	-3.3 C (26.1 F)
2001	-2.2 C (28.0 F)
2002	-3.3 C (26.1 F)
2003	0.0 C (32.0 F)
2004	0.0 C (32.0 F)
2005	0.0 C (32.0 F)
2006	2.8 C (37.0 F)
2007	-9.4 C (15.1 F)
2008	5.0 C (41.0 F)
2009	0.0 C (32.0 F)
2010	1.7 C (35.1 F)
2011	0.0 C (32.0 F)
2012	0.0 C (32.0 F)

Wettest day (Rx1day)

The wettest day of the year at Santo Tomas, 1948 to 2012. The record is 97.8 mm (3.9 in) in 1991, marked on the chart; the median year is 37.3 mm (1.5 in).

Wettest day (Rx1day) at Santo Tomas by year
Year	Wettest day (Rx1day)
1948	21.8 mm (0.9 in)
1949	31.5 mm (1.2 in)
1950	13.0 mm (0.5 in)
1951	43.4 mm (1.7 in)
1952	38.9 mm (1.5 in)
1953	31.0 mm (1.2 in)
1954	47.8 mm (1.9 in)
1955	15.0 mm (0.6 in)
1956	43.9 mm (1.7 in)
1957	38.4 mm (1.5 in)
1958	29.0 mm (1.1 in)
1959	25.9 mm (1.0 in)
1960	22.4 mm (0.9 in)
1961	17.8 mm (0.7 in)
1962	35.8 mm (1.4 in)
1963	40.4 mm (1.6 in)
1964	17.8 mm (0.7 in)
1965	56.9 mm (2.2 in)
1966	24.9 mm (1.0 in)
1967	39.9 mm (1.6 in)
1968	27.9 mm (1.1 in)
1969	61.0 mm (2.4 in)
1970	47.5 mm (1.9 in)
1971	15.7 mm (0.6 in)
1972	17.8 mm (0.7 in)
1973	27.4 mm (1.1 in)
1974	35.8 mm (1.4 in)
1975	31.5 mm (1.2 in)
1976	51.8 mm (2.0 in)
1977	22.9 mm (0.9 in)
1978	75.9 mm (3.0 in)
1979	30.0 mm (1.2 in)
1980	63.8 mm (2.5 in)
1981	37.8 mm (1.5 in)
1982	33.0 mm (1.3 in)
1983	52.3 mm (2.1 in)
1984	41.7 mm (1.6 in)
1985	28.4 mm (1.1 in)
1986	30.0 mm (1.2 in)
1987	56.9 mm (2.2 in)
1988	43.9 mm (1.7 in)
1989	14.0 mm (0.6 in)
1990	19.8 mm (0.8 in)
1991	97.8 mm (3.9 in)
1992	53.3 mm (2.1 in)
1993	83.3 mm (3.3 in)
1994	42.2 mm (1.7 in)
1995	71.9 mm (2.8 in)
1996	30.5 mm (1.2 in)
1997	46.5 mm (1.8 in)
1998	78.0 mm (3.1 in)
1999	25.4 mm (1.0 in)
2000	39.9 mm (1.6 in)
2001	23.9 mm (0.9 in)
2002	20.6 mm (0.8 in)
2003	33.3 mm (1.3 in)
2004	40.4 mm (1.6 in)
2005	37.3 mm (1.5 in)
2006	27.4 mm (1.1 in)
2007	49.3 mm (1.9 in)
2008	39.9 mm (1.6 in)
2009	47.2 mm (1.9 in)
2010	97.8 mm (3.9 in)
2011	66.3 mm (2.6 in)
2012	22.9 mm (0.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at Santo Tomas, 1948 to 2012. The record is 238.3 mm (9.4 in) in 2010, marked on the chart; the median year is 59.9 mm (2.4 in).

Wettest five days (Rx5day) at Santo Tomas by year
Year	Wettest five days (Rx5day)
1948	39.6 mm (1.6 in)
1949	75.4 mm (3.0 in)
1950	19.4 mm (0.8 in)
1951	56.5 mm (2.2 in)
1952	66.3 mm (2.6 in)
1953	36.6 mm (1.4 in)
1954	105.0 mm (4.1 in)
1955	33.5 mm (1.3 in)
1956	44.7 mm (1.8 in)
1957	92.3 mm (3.6 in)
1958	51.1 mm (2.0 in)
1959	42.6 mm (1.7 in)
1960	46.0 mm (1.8 in)
1961	32.0 mm (1.3 in)
1962	50.6 mm (2.0 in)
1963	71.4 mm (2.8 in)
1964	32.7 mm (1.3 in)
1965	76.0 mm (3.0 in)
1966	55.1 mm (2.2 in)
1967	64.6 mm (2.5 in)
1968	35.8 mm (1.4 in)
1969	81.9 mm (3.2 in)
1970	106.2 mm (4.2 in)
1971	23.1 mm (0.9 in)
1972	30.5 mm (1.2 in)
1973	53.1 mm (2.1 in)
1974	72.7 mm (2.9 in)
1975	55.7 mm (2.2 in)
1976	145.6 mm (5.7 in)
1977	59.9 mm (2.4 in)
1978	108.2 mm (4.3 in)
1979	45.9 mm (1.8 in)
1980	195.7 mm (7.7 in)
1981	88.4 mm (3.5 in)
1982	55.6 mm (2.2 in)
1983	129.3 mm (5.1 in)
1984	55.2 mm (2.2 in)
1985	33.0 mm (1.3 in)
1986	50.8 mm (2.0 in)
1987	123.0 mm (4.8 in)
1988	89.9 mm (3.5 in)
1989	17.6 mm (0.7 in)
1990	46.6 mm (1.8 in)
1991	119.6 mm (4.7 in)
1992	87.6 mm (3.4 in)
1993	146.3 mm (5.8 in)
1994	66.1 mm (2.6 in)
1995	79.1 mm (3.1 in)
1996	54.4 mm (2.1 in)
1997	76.3 mm (3.0 in)
1998	120.0 mm (4.7 in)
1999	26.7 mm (1.1 in)
2000	72.5 mm (2.9 in)
2001	72.9 mm (2.9 in)
2002	39.4 mm (1.6 in)
2003	60.5 mm (2.4 in)
2004	72.0 mm (2.8 in)
2005	56.1 mm (2.2 in)
2006	52.6 mm (2.1 in)
2007	50.1 mm (2.0 in)
2008	72.2 mm (2.8 in)
2009	65.0 mm (2.6 in)
2010	238.3 mm (9.4 in)
2011	84.1 mm (3.3 in)
2012	25.7 mm (1.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at Santo Tomas, 1948 to 2012. The record is 254 days in 1972, marked on the chart; the median year is 143 days.

Longest dry spell (CDD) at Santo Tomas by year
Year	Longest dry spell (CDD)
1948	157 days
1949	223 days
1950	126 days
1951	87 days
1952	193 days
1953	172 days
1954	114 days
1955	119 days
1956	145 days
1957	93 days
1958	184 days
1959	122 days
1960	240 days
1961	214 days
1962	164 days
1963	75 days
1964	191 days
1965	108 days
1966	228 days
1967	210 days
1968	138 days
1969	184 days
1970	211 days
1971	160 days
1972	254 days
1973	234 days
1974	201 days
1975	124 days
1976	139 days
1977	95 days
1978	193 days
1979	153 days
1980	218 days
1981	149 days
1982	147 days
1983	106 days
1984	76 days
1985	172 days
1986	90 days
1987	204 days
1988	135 days
1989	143 days
1990	38 days
1991	56 days
1992	65 days
1993	119 days
1994	48 days
1995	37 days
1996	48 days
1997	173 days
1998	89 days
1999	81 days
2000	117 days
2001	118 days
2002	39 days
2003	97 days
2004	152 days
2005	137 days
2006	224 days
2007	129 days
2008	96 days
2009	186 days
2010	162 days
2011	226 days
2012	218 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.

Frost Dates and Growing Season

44 years with a frost

Across 44 years with a frost, the median last spring frost at Santo Tomas falls on 6 March and the median first autumn frost on 1 December, which leaves a median of 272 days between them.

Fitted over all years, the growing season changes by +5.4 days per decade at this station.

Frost dates and growing season at Santo Tomas
Measure	Median, all years	Earliest period	Recent period (1965 to 2009)	Recent against earliest	Fitted trend
Last spring frost	6 March	n/a	5 March	n/a	-3.7 days per decade
First autumn frost	1 December	n/a	2 December	n/a	+1.6 days per decade
Growing days	272 days	n/a	279 days	n/a	+5.4 days per decade

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Rainfall Return Levels

59 years, 1949 to 2012

A day with at least 35.1 mm (1.4 in) of rain is expected about once in 2 years. A day with at least 95.9 mm (3.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Santo Tomas: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	35.1 mm (1.4 in)
5 years	50.6 mm (2.0 in)
10 years	61.2 mm (2.4 in)
25 years	74.9 mm (2.9 in)
50 years	85.4 mm (3.4 in)
100 years	95.9 mm (3.8 in)	Longer than the 59 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, 59 years of values from 1949 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: 97.8 mm (3.9 in) in 2010; 78.0 mm (3.1 in) in 1998; 75.9 mm (3.0 in) in 1978.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Download the Data

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