Santa Rosa Weather Records (MXN00032053)

Record envelope, standing records and threshold days for Santa Rosa (MXN00032053), Mexico, with 72 years of record.

Key Facts for Santa Rosa

Santa Rosa (MXN00032053) is a weather station in Mexico at 22.92 latitude and -103.10 longitude, 2,236 m (7,335 ft) above sea level.
The station reports from 1941 to 2012, 72 years of record.
1,464 records set at Santa Rosa still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Santa Rosa tied a daily record low maximum temperature of 13.9 C (57.0 F) on 11 December 2012.

About the Station

Location: Mexico, 22.92 latitude, -103.10 longitude.
Elevation: 2,236 m (7,335 ft).
Period of record: 1941 to 2012, 72 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 Santa Rosa. 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 Santa Rosa, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	31.7 C (89.1 F)	-15.6 C (3.9 F)	n/a	n/a
Feb	37.8 C (100.0 F)	-13.3 C (8.1 F)	n/a	n/a
Mar	35.6 C (96.1 F)	-15.0 C (5.0 F)	n/a	n/a
Apr	41.7 C (107.1 F)	-9.4 C (15.1 F)	n/a	n/a
May	40.6 C (105.1 F)	-2.2 C (28.0 F)	n/a	n/a
Jun	40.0 C (104.0 F)	3.3 C (37.9 F)	n/a	n/a
Jul	36.7 C (98.1 F)	5.0 C (41.0 F)	n/a	n/a
Aug	36.7 C (98.1 F)	5.0 C (41.0 F)	n/a	n/a
Sep	33.9 C (93.0 F)	0.0 C (32.0 F)	n/a	n/a
Oct	33.9 C (93.0 F)	-6.1 C (21.0 F)	n/a	n/a
Nov	33.9 C (93.0 F)	-13.9 C (7.0 F)	n/a	n/a
Dec	31.7 C (89.1 F)	-14.4 C (6.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Santa Rosa still stand. 2006 holds the most, with 291.

Standing records at Santa Rosa by the year they were set
Year set	Standing records
1941	6
1942	43
1943	50
1944	37
1947	15
1948	6
1949	22
1950	12
1951	26
1952	11
1953	20
1954	7
1955	14
1956	13
1957	8
1958	14
1959	14
1960	7
1961	6
1962	5
1963	37
1964	14
1965	6
1966	15
1967	23
1968	13
1969	7
1970	13
1971	5
1972	33
1973	8
1974	10
1975	9
1976	13
1977	3
1978	6
1979	5
1980	9
1981	7
1983	16
1984	17
1985	11
1986	8
1987	11
1988	7
1989	11
1990	3
1991	4
1992	14
1993	4
1994	1
1995	2
1996	3
1997	15
1998	4
1999	2
2000	8
2003	15
2004	3
2006	291
2007	9
2009	249
2010	167
2011	10
2012	7

All-Time Record Progression

12 new records

12 all-time records were set at Santa Rosa between 14 December 1997 and 16 June 2009. Each dot is a new record.

When Santa Rosa set new all-time records
Date	Kind	Detail
1997-12-14	Record low maximum temperature	Record low maximum temperature 1.7 C (35.1 F)
2006-03-03	Record high maximum temperature	Record high maximum temperature 35.6 C (96.1 F)
2006-04-02	Record high maximum temperature	Record high maximum temperature 37.8 C (100.0 F)
2006-04-03	Record high maximum temperature	Record high maximum temperature 38.9 C (102.0 F)
2006-04-12	Record high maximum temperature	Record high maximum temperature 41.7 C (107.1 F)
2006-04-15	Record high minimum temperature	Record high minimum temperature 17.8 C (64.0 F)
2006-04-23	Record high minimum temperature	Record high minimum temperature 18.9 C (66.0 F)
2006-05-03	Record high minimum temperature	Record high minimum temperature 20.0 C (68.0 F)
2006-06-11	Record high minimum temperature	Record high minimum temperature 20.6 C (69.1 F)
2006-06-28	Record high minimum temperature	Record high minimum temperature 21.7 C (71.1 F)
2007-06-13	Record daily precipitation	Record daily precipitation 121.2 mm (4.8 in)
2009-06-16	Record high minimum temperature	Record high minimum temperature 22.8 C (73.0 F)

Wettest Day of Each Month

Jun: 121.2 mm (4.8 in)

The wettest day on record for each calendar month at Santa Rosa. The most was 121.2 mm (4.8 in) on 13 June 2007.

Record daily precipitation for each month at Santa Rosa
Month	Record daily precipitation (mm)	Date
Jan	33.3 mm (1.3 in)	11 January 1987
Feb	52.1 mm (2.1 in)	2 February 2010
Mar	40.4 mm (1.6 in)	5 March 1958
Apr	33.8 mm (1.3 in)	13 April 1959
May	32.0 mm (1.3 in)	25 May 1971
Jun	121.2 mm (4.8 in)	13 June 2007
Jul	77.0 mm (3.0 in)	3 July 1991
Aug	75.4 mm (3.0 in)	9 August 1960
Sep	67.3 mm (2.6 in)	27 September 1973
Oct	79.0 mm (3.1 in)	15 October 1967
Nov	34.0 mm (1.3 in)	17 November 1976
Dec	26.9 mm (1.1 in)	2 December 1979

Period of Record Coverage

1941 to 2012

66 years of record at Santa Rosa, 1941 to 2012. 8 years have data for under 90 percent of days and are left out of rankings: 1941, 1944, 1947, 1980, 1981, 1982, 2003, 2004.

Days with data per year at Santa Rosa
Year	Days with data	Share of year	Complete
1941	92	25%	No
1942	364	100%	Yes
1943	365	100%	Yes
1944	305	83%	No
1947	306	84%	No
1948	366	100%	Yes
1949	364	100%	Yes
1950	365	100%	Yes
1951	364	100%	Yes
1952	366	100%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	362	99%	Yes
1956	335	92%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	365	100%	Yes
1960	366	100%	Yes
1961	365	100%	Yes
1962	365	100%	Yes
1963	364	100%	Yes
1964	366	100%	Yes
1965	364	100%	Yes
1966	365	100%	Yes
1967	362	99%	Yes
1968	364	99%	Yes
1969	364	100%	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	366	100%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	244	67%	No
1981	246	67%	No
1982	299	82%	No
1983	365	100%	Yes
1984	335	92%	Yes
1985	364	100%	Yes
1986	334	92%	Yes
1987	365	100%	Yes
1988	366	100%	Yes
1989	365	100%	Yes
1990	365	100%	Yes
1991	365	100%	Yes
1992	366	100%	Yes
1993	365	100%	Yes
1994	365	100%	Yes
1995	365	100%	Yes
1996	366	100%	Yes
1997	363	99%	Yes
1998	365	100%	Yes
1999	365	100%	Yes
2000	366	100%	Yes
2003	293	80%	No
2004	31	8%	No
2006	362	99%	Yes
2007	365	100%	Yes
2009	365	100%	Yes
2010	365	100%	Yes
2011	364	100%	Yes
2012	366	100%	Yes

Latest Records

Latest records at Santa Rosa
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
11 December 2012	Santa Rosa, MX	daily low max (Tie)	13.9 C (57.0 F)	tie	71 years	7 of 100 (Routine)
18 September 2012	Santa Rosa, MX	daily low min	3.9 C (39.0 F)	2.2 C (4.0 F)	52 years	30 of 100 (Routine)
14 September 2012	Santa Rosa, MX	daily low max (Tie)	18.9 C (66.0 F)	tie	28 years	3 of 100 (Routine)
13 September 2012	Santa Rosa, MX	daily low max (Tie)	16.7 C (62.1 F)	tie	28 years	3 of 100 (Routine)
17 July 2012	Santa Rosa, MX	daily rain	38.4 mm (1.5 in)	6.6 mm (0.26 in)	17 years	19 of 100 (Routine)
11 May 2012	Santa Rosa, MX	daily low min	1.7 C (35.1 F)	1.6 C (2.9 F)	70 years	33 of 100 (Routine)
18 February 2012	Santa Rosa, MX	daily low max (Tie)	15.0 C (59.0 F)	tie	45 years	5 of 100 (Routine)
16 February 2012	Santa Rosa, MX	daily low max	11.1 C (52.0 F)	2.8 C (5.0 F)	46 years	28 of 100 (Routine)
13 February 2012	Santa Rosa, MX	daily low max	13.3 C (55.9 F)	1.1 C (2.0 F)	34 years	19 of 100 (Routine)
11 February 2012	Santa Rosa, MX	monthly low max (Tie)	7.8 C (46.0 F)	tie	24 years	6 of 100 (Routine)
26 January 2012	Santa Rosa, MX	daily low min	-8.3 C (17.1 F)	1.1 C (2.0 F)	58 years	26 of 100 (Routine)
2 January 2012	Santa Rosa, MX	daily low max	12.8 C (55.0 F)	0.5 C (0.9 F)	16 years	12 of 100 (Routine)
30 November 2011	Santa Rosa, MX	daily low min	-8.3 C (17.1 F)	3.9 C (7.0 F)	37 years	28 of 100 (Routine)
29 November 2011	Santa Rosa, MX	daily low min	-10.6 C (12.9 F)	0.6 C (1.1 F)	64 years	27 of 100 (Routine)
28 November 2011	Santa Rosa, MX	monthly low min	-13.9 C (7.0 F)	3.9 C (7.0 F)	68 years	47 of 100 (Notable)
28 November 2011	Santa Rosa, MX	daily low max	13.3 C (55.9 F)	0.6 C (1.1 F)	14 years	12 of 100 (Routine)
27 November 2011	Santa Rosa, MX	monthly low max	6.1 C (43.0 F)	3.9 C (7.0 F)	53 years	45 of 100 (Notable)
10 November 2011	Santa Rosa, MX	daily low max	14.4 C (57.9 F)	0.6 C (1.1 F)	24 years	15 of 100 (Routine)
15 October 2011	Santa Rosa, MX	daily low max (Tie)	15.0 C (59.0 F)	tie	56 years	5 of 100 (Routine)
12 October 2011	Santa Rosa, MX	daily low max	13.3 C (55.9 F)	2.3 C (4.1 F)	8 years	16 of 100 (Routine)

Climate Trend

55 complete years, 1942 to 2012

One stripe for each of 55 complete years at Santa Rosa, 1942 to 2012. Blue stripes are years cooler than the station's own mean of 14.9 C (58.8 F); red stripes are warmer. The coolest year was 1942, at 13.2 C (55.8 F), and the warmest was 2009, at 22.7 C (72.9 F). The strongest colour marks a difference of 7.9 C (14.2 F).

Annual mean temperature at Santa Rosa as warming stripes, 1942 to 2012
Year	Annual mean temperature	Difference from the station mean
1942	13.2 C	-1.68 C
1943	13.3 C	-1.55 C
1948	14.8 C	-0.09 C
1949	14.1 C	-0.79 C
1950	14.1 C	-0.82 C
1951	14.1 C	-0.80 C
1952	14.0 C	-0.87 C
1953	14.2 C	-0.73 C
1954	15.0 C	+0.11 C
1955	14.5 C	-0.35 C
1957	15.1 C	+0.19 C
1958	14.5 C	-0.41 C
1959	14.5 C	-0.39 C
1960	14.8 C	-0.13 C
1961	14.2 C	-0.68 C
1962	14.8 C	-0.08 C
1963	14.6 C	-0.33 C
1964	14.9 C	+0.00 C
1965	14.5 C	-0.36 C
1966	14.3 C	-0.62 C
1967	14.5 C	-0.39 C
1968	14.4 C	-0.44 C
1969	15.1 C	+0.17 C
1970	14.4 C	-0.47 C
1971	14.7 C	-0.18 C
1972	14.7 C	-0.23 C
1973	14.2 C	-0.64 C
1974	14.5 C	-0.34 C
1975	14.5 C	-0.42 C
1976	14.1 C	-0.75 C
1977	14.6 C	-0.32 C
1978	14.5 C	-0.38 C
1979	14.7 C	-0.23 C
1983	13.9 C	-1.03 C
1985	14.2 C	-0.69 C
1987	13.7 C	-1.23 C
1988	14.3 C	-0.58 C
1989	14.5 C	-0.37 C
1990	14.5 C	-0.40 C
1991	14.7 C	-0.20 C
1992	14.1 C	-0.79 C
1993	15.0 C	+0.10 C
1994	15.6 C	+0.73 C
1995	15.4 C	+0.48 C
1996	15.2 C	+0.32 C
1997	14.3 C	-0.62 C
1998	15.1 C	+0.25 C
1999	14.5 C	-0.37 C
2000	14.8 C	-0.08 C
2006	22.5 C	+7.63 C
2007	13.7 C	-1.23 C
2009	22.7 C	+7.82 C
2010	21.2 C	+6.32 C
2011	14.6 C	-0.24 C
2012	13.9 C	-1.02 C

The annual mean temperature here has risen by 0.4 C (0.2 to 0.6) per decade over 1942 to 2012. In Fahrenheit: 0.7 F (0.3 to 1.1) per decade. The slope is a straight line fitted to 55 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Santa Rosa
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.4 C (0.2 to 0.6) per decade	0.7 F (0.3 to 1.1) per decade	1942 to 2012	55	Rise
Mean daily maximum	0.4 C (0.1 to 0.7) per decade	0.7 F (0.2 to 1.2) per decade	1942 to 2012	55	Rise
Mean daily minimum	0.4 C (0.2 to 0.6) per decade	0.7 F (0.3 to 1.1) per decade	1942 to 2012	55	Rise

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

1941 to 2012

Yearly extremes at Santa Rosa: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	41.7 C (107.1 F)	2006	31.7 C (89.1 F)	66
Coldest night (TNn)	-15.6 C (3.9 F)	1944	-7.5 C (18.5 F)	66
Wettest day (Rx1day)	121.2 mm (4.8 in)	2007	36.2 mm (1.4 in)	68
Wettest five days (Rx5day)	172.3 mm (6.8 in)	1991	70.3 mm (2.8 in)	68
Longest dry spell (CDD)	161 days	1949	88 days	68

Hottest day (TXx)

The hottest day of the year at Santa Rosa, 1941 to 2012. The record is 41.7 C (107.1 F) in 2006, marked on the chart; the median year is 31.7 C (89.1 F).

Hottest day (TXx) at Santa Rosa by year
Year	Hottest day (TXx)
1941	25.0 C (77.0 F)
1942	30.0 C (86.0 F)
1943	32.2 C (90.0 F)
1944	31.1 C (88.0 F)
1947	32.8 C (91.0 F)
1948	30.0 C (86.0 F)
1949	31.1 C (88.0 F)
1950	31.1 C (88.0 F)
1951	30.0 C (86.0 F)
1952	31.7 C (89.1 F)
1953	33.3 C (91.9 F)
1954	35.0 C (95.0 F)
1955	31.1 C (88.0 F)
1956	31.7 C (89.1 F)
1957	33.3 C (91.9 F)
1958	31.1 C (88.0 F)
1959	31.1 C (88.0 F)
1960	31.7 C (89.1 F)
1961	32.2 C (90.0 F)
1962	31.7 C (89.1 F)
1963	31.7 C (89.1 F)
1964	31.7 C (89.1 F)
1965	32.8 C (91.0 F)
1966	31.7 C (89.1 F)
1967	33.3 C (91.9 F)
1968	31.1 C (88.0 F)
1969	33.9 C (93.0 F)
1970	32.2 C (90.0 F)
1971	31.1 C (88.0 F)
1972	30.6 C (87.1 F)
1973	32.2 C (90.0 F)
1974	31.1 C (88.0 F)
1975	30.6 C (87.1 F)
1976	30.6 C (87.1 F)
1977	30.0 C (86.0 F)
1978	31.1 C (88.0 F)
1979	30.6 C (87.1 F)
1980	32.8 C (91.0 F)
1981	28.3 C (82.9 F)
1982	32.8 C (91.0 F)
1983	32.2 C (90.0 F)
1984	30.0 C (86.0 F)
1985	30.0 C (86.0 F)
1986	31.1 C (88.0 F)
1987	29.4 C (84.9 F)
1988	30.0 C (86.0 F)
1989	33.3 C (91.9 F)
1990	33.3 C (91.9 F)
1991	31.7 C (89.1 F)
1992	31.1 C (88.0 F)
1993	33.3 C (91.9 F)
1994	33.3 C (91.9 F)
1995	33.9 C (93.0 F)
1996	32.2 C (90.0 F)
1997	30.6 C (87.1 F)
1998	32.8 C (91.0 F)
1999	30.6 C (87.1 F)
2000	31.1 C (88.0 F)
2001	n/a
2002	n/a
2003	31.7 C (89.1 F)
2004	21.7 C (71.1 F)
2006	41.7 C (107.1 F)
2007	30.6 C (87.1 F)
2009	40.0 C (104.0 F)
2010	40.6 C (105.1 F)
2011	33.9 C (93.0 F)
2012	30.6 C (87.1 F)

Coldest night (TNn)

The coldest night of the year at Santa Rosa, 1941 to 2012. The record is -15.6 C (3.9 F) in 1944, marked on the chart; the median year is -7.5 C (18.5 F).

Coldest night (TNn) at Santa Rosa by year
Year	Coldest night (TNn)
1941	-3.3 C (26.1 F)
1942	-15.0 C (5.0 F)
1943	-10.6 C (12.9 F)
1944	-15.6 C (3.9 F)
1947	-10.6 C (12.9 F)
1948	-7.2 C (19.0 F)
1949	-10.0 C (14.0 F)
1950	-10.0 C (14.0 F)
1951	-15.0 C (5.0 F)
1952	-13.3 C (8.1 F)
1953	-14.4 C (6.1 F)
1954	-7.8 C (18.0 F)
1955	-15.6 C (3.9 F)
1956	-10.6 C (12.9 F)
1957	-9.4 C (15.1 F)
1958	-10.0 C (14.0 F)
1959	-7.2 C (19.0 F)
1960	-10.0 C (14.0 F)
1961	-8.9 C (16.0 F)
1962	-12.2 C (10.0 F)
1963	-6.7 C (19.9 F)
1964	-7.2 C (19.0 F)
1965	-5.6 C (21.9 F)
1966	-7.8 C (18.0 F)
1967	-8.3 C (17.1 F)
1968	-6.1 C (21.0 F)
1969	-5.0 C (23.0 F)
1970	-8.9 C (16.0 F)
1971	-6.7 C (19.9 F)
1972	-7.8 C (18.0 F)
1973	-9.4 C (15.1 F)
1974	-6.7 C (19.9 F)
1975	-8.3 C (17.1 F)
1976	-7.2 C (19.0 F)
1977	-5.0 C (23.0 F)
1978	-5.6 C (21.9 F)
1979	-8.3 C (17.1 F)
1980	-5.0 C (23.0 F)
1981	-5.6 C (21.9 F)
1982	-5.0 C (23.0 F)
1983	-5.0 C (23.0 F)
1984	-7.2 C (19.0 F)
1985	-8.9 C (16.0 F)
1986	-7.8 C (18.0 F)
1987	-6.7 C (19.9 F)
1988	-8.9 C (16.0 F)
1989	-7.2 C (19.0 F)
1990	-6.1 C (21.0 F)
1991	-6.7 C (19.9 F)
1992	-5.6 C (21.9 F)
1993	-5.0 C (23.0 F)
1994	-5.6 C (21.9 F)
1995	-5.0 C (23.0 F)
1996	-4.4 C (24.1 F)
1997	-10.0 C (14.0 F)
1998	-8.9 C (16.0 F)
1999	-8.3 C (17.1 F)
2000	-7.8 C (18.0 F)
2001	n/a
2002	n/a
2003	-6.7 C (19.9 F)
2004	-5.0 C (23.0 F)
2006	-1.1 C (30.0 F)
2007	-5.0 C (23.0 F)
2009	1.7 C (35.1 F)
2010	0.0 C (32.0 F)
2011	-13.9 C (7.0 F)
2012	-8.3 C (17.1 F)

Wettest day (Rx1day)

The wettest day of the year at Santa Rosa, 1941 to 2012. The record is 121.2 mm (4.8 in) in 2007, marked on the chart; the median year is 36.2 mm (1.4 in).

Wettest day (Rx1day) at Santa Rosa by year
Year	Wettest day (Rx1day)
1941	21.8 mm (0.9 in)
1942	32.3 mm (1.3 in)
1943	42.4 mm (1.7 in)
1944	47.8 mm (1.9 in)
1947	35.1 mm (1.4 in)
1948	42.9 mm (1.7 in)
1949	40.1 mm (1.6 in)
1950	31.0 mm (1.2 in)
1951	52.6 mm (2.1 in)
1952	23.4 mm (0.9 in)
1953	24.9 mm (1.0 in)
1954	59.9 mm (2.4 in)
1955	49.3 mm (1.9 in)
1956	25.4 mm (1.0 in)
1957	51.8 mm (2.0 in)
1958	52.8 mm (2.1 in)
1959	33.8 mm (1.3 in)
1960	75.4 mm (3.0 in)
1961	34.8 mm (1.4 in)
1962	25.9 mm (1.0 in)
1963	35.8 mm (1.4 in)
1964	23.4 mm (0.9 in)
1965	28.4 mm (1.1 in)
1966	54.9 mm (2.2 in)
1967	79.0 mm (3.1 in)
1968	26.2 mm (1.0 in)
1969	46.5 mm (1.8 in)
1970	39.1 mm (1.5 in)
1971	34.5 mm (1.4 in)
1972	34.5 mm (1.4 in)
1973	67.3 mm (2.6 in)
1974	35.1 mm (1.4 in)
1975	33.8 mm (1.3 in)
1976	42.7 mm (1.7 in)
1977	45.0 mm (1.8 in)
1978	35.8 mm (1.4 in)
1979	31.0 mm (1.2 in)
1980	18.8 mm (0.7 in)
1981	30.0 mm (1.2 in)
1982	31.5 mm (1.2 in)
1983	40.9 mm (1.6 in)
1984	27.2 mm (1.1 in)
1985	23.4 mm (0.9 in)
1986	31.0 mm (1.2 in)
1987	42.9 mm (1.7 in)
1988	31.8 mm (1.3 in)
1989	66.5 mm (2.6 in)
1990	56.4 mm (2.2 in)
1991	77.0 mm (3.0 in)
1992	29.0 mm (1.1 in)
1993	24.9 mm (1.0 in)
1994	49.8 mm (2.0 in)
1995	56.6 mm (2.2 in)
1996	35.6 mm (1.4 in)
1997	36.6 mm (1.4 in)
1998	54.6 mm (2.1 in)
1999	56.6 mm (2.2 in)
2000	34.0 mm (1.3 in)
2001	30.7 mm (1.2 in)
2002	55.1 mm (2.2 in)
2003	37.6 mm (1.5 in)
2004	11.4 mm (0.4 in)
2006	31.0 mm (1.2 in)
2007	121.2 mm (4.8 in)
2009	62.0 mm (2.4 in)
2010	64.8 mm (2.6 in)
2011	44.2 mm (1.7 in)
2012	38.4 mm (1.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at Santa Rosa, 1941 to 2012. The record is 172.3 mm (6.8 in) in 1991, marked on the chart; the median year is 70.3 mm (2.8 in).

Wettest five days (Rx5day) at Santa Rosa by year
Year	Wettest five days (Rx5day)
1941	21.8 mm (0.9 in)
1942	96.5 mm (3.8 in)
1943	93.8 mm (3.7 in)
1944	91.5 mm (3.6 in)
1947	51.9 mm (2.0 in)
1948	86.3 mm (3.4 in)
1949	61.0 mm (2.4 in)
1950	43.4 mm (1.7 in)
1951	131.0 mm (5.2 in)
1952	41.6 mm (1.6 in)
1953	38.9 mm (1.5 in)
1954	78.7 mm (3.1 in)
1955	99.1 mm (3.9 in)
1956	57.1 mm (2.2 in)
1957	98.1 mm (3.9 in)
1958	82.3 mm (3.2 in)
1959	79.9 mm (3.1 in)
1960	133.2 mm (5.2 in)
1961	111.3 mm (4.4 in)
1962	42.2 mm (1.7 in)
1963	59.4 mm (2.3 in)
1964	49.0 mm (1.9 in)
1965	62.9 mm (2.5 in)
1966	108.5 mm (4.3 in)
1967	119.3 mm (4.7 in)
1968	63.1 mm (2.5 in)
1969	51.1 mm (2.0 in)
1970	89.5 mm (3.5 in)
1971	66.8 mm (2.6 in)
1972	89.7 mm (3.5 in)
1973	91.7 mm (3.6 in)
1974	46.3 mm (1.8 in)
1975	107.5 mm (4.2 in)
1976	118.7 mm (4.7 in)
1977	57.0 mm (2.2 in)
1978	46.1 mm (1.8 in)
1979	46.5 mm (1.8 in)
1980	41.0 mm (1.6 in)
1981	46.2 mm (1.8 in)
1982	61.1 mm (2.4 in)
1983	103.1 mm (4.1 in)
1984	48.6 mm (1.9 in)
1985	50.6 mm (2.0 in)
1986	72.1 mm (2.8 in)
1987	95.5 mm (3.8 in)
1988	79.1 mm (3.1 in)
1989	123.2 mm (4.9 in)
1990	110.6 mm (4.4 in)
1991	172.3 mm (6.8 in)
1992	67.2 mm (2.6 in)
1993	75.9 mm (3.0 in)
1994	66.4 mm (2.6 in)
1995	86.6 mm (3.4 in)
1996	68.4 mm (2.7 in)
1997	51.4 mm (2.0 in)
1998	64.3 mm (2.5 in)
1999	65.0 mm (2.6 in)
2000	48.5 mm (1.9 in)
2001	95.0 mm (3.7 in)
2002	148.6 mm (5.9 in)
2003	65.0 mm (2.6 in)
2004	31.7 mm (1.2 in)
2006	62.2 mm (2.4 in)
2007	139.0 mm (5.5 in)
2009	80.5 mm (3.2 in)
2010	152.9 mm (6.0 in)
2011	82.0 mm (3.2 in)
2012	50.6 mm (2.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at Santa Rosa, 1941 to 2012. The record is 161 days in 1949, marked on the chart; the median year is 88 days.

Longest dry spell (CDD) at Santa Rosa by year
Year	Longest dry spell (CDD)
1941	49 days
1942	90 days
1943	113 days
1944	47 days
1947	75 days
1948	50 days
1949	161 days
1950	150 days
1951	76 days
1952	149 days
1953	82 days
1954	160 days
1955	98 days
1956	75 days
1957	87 days
1958	71 days
1959	62 days
1960	108 days
1961	60 days
1962	30 days
1963	59 days
1964	45 days
1965	68 days
1966	29 days
1967	47 days
1968	42 days
1969	94 days
1970	100 days
1971	91 days
1972	62 days
1973	71 days
1974	73 days
1975	90 days
1976	119 days
1977	134 days
1978	107 days
1979	63 days
1980	86 days
1981	31 days
1982	105 days
1983	125 days
1984	103 days
1985	103 days
1986	89 days
1987	60 days
1988	96 days
1989	145 days
1990	78 days
1991	122 days
1992	41 days
1993	103 days
1994	54 days
1995	117 days
1996	122 days
1997	36 days
1998	111 days
1999	101 days
2000	57 days
2001	67 days
2002	58 days
2003	105 days
2004	12 days
2006	112 days
2007	125 days
2009	94 days
2010	114 days
2011	122 days
2012	76 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

52 years with a frost

Across 52 years with a frost, the median last spring frost at Santa Rosa falls on 5 April and the median first autumn frost on 2 November, which leaves a median of 214 days between them.

Fitted over all years, the growing season changes by +3.7 days per decade at this station.

Frost dates and growing season at Santa Rosa
Measure	Median, all years	Earliest period	Recent period (1969 to 2012)	Recent against earliest	Fitted trend
Last spring frost	5 April	n/a	7 April	n/a	-0.9 days per decade
First autumn frost	2 November	n/a	4 November	n/a	+2.7 days per decade
Growing days	214 days	n/a	214 days	n/a	+3.7 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

60 years, 1942 to 2012

A day with at least 39.4 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 108.9 mm (4.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Santa Rosa: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	39.4 mm (1.6 in)
5 years	54.2 mm (2.1 in)
10 years	65.3 mm (2.6 in)
25 years	81.2 mm (3.2 in)
50 years	94.4 mm (3.7 in)
100 years	108.9 mm (4.3 in)	Longer than the 60 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, 60 years of values from 1942 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: 121.2 mm (4.8 in) in 2007; 79.0 mm (3.1 in) in 1967; 77.0 mm (3.0 in) in 1991.

Download the Data

Data for Santa Rosa standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Santa Rosa 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 2026-10-15 (15 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).