Santa Rosa Weather Records (MXN00014136)

Record envelope, standing records and threshold days for Santa Rosa (MXN00014136), Mexico, with 58 years of record.

Key Facts for Santa Rosa

Santa Rosa (MXN00014136) is a weather station in Mexico at 20.90 latitude and -103.72 longitude, 1,059 m (3,474 ft) above sea level.
The station reports from 1955 to 2012, 58 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 set a daily record low maximum temperature of 21.1 C (70.0 F) on 30 January 2012.

About the Station

Location: Mexico, 20.90 latitude, -103.72 longitude.
Elevation: 1,059 m (3,474 ft).
Period of record: 1955 to 2012, 58 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	39.4 C (102.9 F)	3.3 C (37.9 F)	n/a	n/a
Feb	41.1 C (106.0 F)	4.4 C (39.9 F)	n/a	n/a
Mar	42.8 C (109.0 F)	7.8 C (46.0 F)	n/a	n/a
Apr	45.0 C (113.0 F)	10.6 C (51.1 F)	n/a	n/a
May	45.0 C (113.0 F)	12.8 C (55.0 F)	n/a	n/a
Jun	45.0 C (113.0 F)	13.9 C (57.0 F)	n/a	n/a
Jul	42.8 C (109.0 F)	15.0 C (59.0 F)	n/a	n/a
Aug	39.4 C (102.9 F)	16.7 C (62.1 F)	n/a	n/a
Sep	38.9 C (102.0 F)	13.3 C (55.9 F)	n/a	n/a
Oct	40.0 C (104.0 F)	8.3 C (46.9 F)	n/a	n/a
Nov	38.9 C (102.0 F)	5.0 C (41.0 F)	n/a	n/a
Dec	38.3 C (100.9 F)	0.0 C (32.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Santa Rosa still stand. 1957 holds the most, with 51.

Standing records at Santa Rosa by the year they were set
Year set	Standing records
1955	36
1956	50
1957	51
1958	32
1959	32
1960	32
1961	30
1962	27
1963	19
1964	28
1965	26
1966	29
1967	37
1968	20
1969	25
1970	20
1971	19
1972	31
1973	36
1974	19
1975	15
1976	24
1977	28
1978	19
1979	37
1980	25
1981	17
1982	31
1983	38
1984	18
1985	20
1986	23
1987	28
1988	11
1989	17
1991	12
1992	40
1993	47
1994	45
1995	34
1996	23
1997	38
1998	23
1999	23
2000	31
2001	8
2002	27
2003	21
2004	17
2005	20
2006	24
2007	10
2008	17
2009	19
2010	17
2011	17
2012	1

All-Time Record Progression

2 new records

2 all-time records were set at Santa Rosa between 16 January 1992 and 14 December 1997. Each dot is a new record.

When Santa Rosa set new all-time records
Date	Kind	Detail
1992-01-16	Record low maximum temperature	Record low maximum temperature 15.6 C (60.1 F)
1997-12-14	Record low minimum temperature	Record low minimum temperature 0.0 C (32.0 F)

Wettest Day of Each Month

Aug: 120.4 mm (4.7 in)

The wettest day on record for each calendar month at Santa Rosa. The most was 120.4 mm (4.7 in) on 22 August 1976.

Record daily precipitation for each month at Santa Rosa
Month	Record daily precipitation (mm)	Date
Jan	58.9 mm (2.3 in)	16 January 1992
Feb	30.0 mm (1.2 in)	2 February 2010
Mar	61.5 mm (2.4 in)	4 March 1968
Apr	51.8 mm (2.0 in)	17 April 1959
May	58.4 mm (2.3 in)	18 May 1967
Jun	77.0 mm (3.0 in)	29 June 2008
Jul	98.6 mm (3.9 in)	12 July 1984
Aug	120.4 mm (4.7 in)	22 August 1976
Sep	115.3 mm (4.5 in)	26 September 2004
Oct	82.3 mm (3.2 in)	10 October 1988
Nov	57.2 mm (2.3 in)	26 November 1982
Dec	33.3 mm (1.3 in)	2 December 1979

Period of Record Coverage

1955 to 2012

57 years of record at Santa Rosa, 1955 to 2012. 15 years have data for under 90 percent of days and are left out of rankings: 1955, 1963, 1991, 1996, 1999, 2000, 2001, 2002 and others.

Days with data per year at Santa Rosa
Year	Days with data	Share of year	Complete
1955	305	84%	No
1956	366	100%	Yes
1957	332	91%	Yes
1958	362	99%	Yes
1959	361	99%	Yes
1960	366	100%	Yes
1961	334	92%	Yes
1962	365	100%	Yes
1963	273	75%	No
1964	366	100%	Yes
1965	365	100%	Yes
1966	362	99%	Yes
1967	365	100%	Yes
1968	364	99%	Yes
1969	354	97%	Yes
1970	361	99%	Yes
1971	365	100%	Yes
1972	362	99%	Yes
1973	365	100%	Yes
1974	363	99%	Yes
1975	365	100%	Yes
1976	363	99%	Yes
1977	365	100%	Yes
1978	335	92%	Yes
1979	364	100%	Yes
1980	363	99%	Yes
1981	365	100%	Yes
1982	363	99%	Yes
1983	360	99%	Yes
1984	365	100%	Yes
1985	365	100%	Yes
1986	365	100%	Yes
1987	364	100%	Yes
1988	365	100%	Yes
1989	365	100%	Yes
1991	304	83%	No
1992	365	100%	Yes
1993	365	100%	Yes
1994	364	100%	Yes
1995	336	92%	Yes
1996	307	84%	No
1997	360	99%	Yes
1998	349	96%	Yes
1999	313	86%	No
2000	319	87%	No
2001	328	90%	No
2002	305	84%	No
2003	316	87%	No
2004	334	91%	Yes
2005	336	92%	Yes
2006	314	86%	No
2007	302	83%	No
2008	316	86%	No
2009	306	84%	No
2010	317	87%	No
2011	342	94%	Yes
2012	16	4%	No

Latest Records

Latest records at Santa Rosa
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 January 2012	Santa Rosa, MX	daily low max	21.1 C (70.0 F)	3.9 C (7.0 F)	48 years	31 of 100 (Routine)
19 January 2012	Santa Rosa, MX	daily high max (Tie)	35.0 C (95.0 F)	tie	40 years	4 of 100 (Routine)
1 December 2011	Santa Rosa, MX	daily low min	7.2 C (45.0 F)	1.7 C (3.1 F)	18 years	16 of 100 (Routine)
30 November 2011	Santa Rosa, MX	daily low min	6.1 C (43.0 F)	1.7 C (3.1 F)	49 years	25 of 100 (Routine)
29 November 2011	Santa Rosa, MX	daily low min	5.6 C (42.1 F)	1.1 C (2.0 F)	49 years	23 of 100 (Routine)
13 October 2011	Santa Rosa, MX	daily low max	25.0 C (77.0 F)	1.7 C (3.1 F)	4 years	13 of 100 (Routine)
12 October 2011	Santa Rosa, MX	daily rain	31.0 mm (1.2 in)	0.8 mm (0.03 in)	4 years	6 of 100 (Routine)
11 October 2011	Santa Rosa, MX	daily rain	30.0 mm (1.2 in)	1.0 mm (0.04 in)	56 years	21 of 100 (Routine)
12 September 2011	Santa Rosa, MX	daily low min	15.6 C (60.1 F)	1.6 C (2.9 F)	45 years	30 of 100 (Routine)
11 September 2011	Santa Rosa, MX	daily low min	15.0 C (59.0 F)	1.1 C (2.0 F)	22 years	19 of 100 (Routine)
10 September 2011	Santa Rosa, MX	daily low min	14.4 C (57.9 F)	0.6 C (1.1 F)	22 years	15 of 100 (Routine)
9 September 2011	Santa Rosa, MX	daily low min	14.4 C (57.9 F)	2.8 C (5.0 F)	54 years	42 of 100 (Notable)
8 September 2011	Santa Rosa, MX	daily low min	16.1 C (61.0 F)	1.7 C (3.1 F)	5 years	18 of 100 (Routine)
1 September 2011	Santa Rosa, MX	daily low max (Tie)	27.8 C (82.0 F)	tie	40 years	4 of 100 (Routine)
25 July 2011	Santa Rosa, MX	daily rain	48.3 mm (1.9 in)	6.6 mm (0.26 in)	49 years	24 of 100 (Routine)
10 July 2011	Santa Rosa, MX	daily low max	26.7 C (80.1 F)	1.1 C (2.0 F)	26 years	17 of 100 (Routine)
8 July 2011	Santa Rosa, MX	daily high min	23.3 C (73.9 F)	0.5 C (0.9 F)	41 years	21 of 100 (Routine)
22 June 2011	Santa Rosa, MX	daily low max	28.3 C (82.9 F)	1.7 C (3.1 F)	46 years	24 of 100 (Routine)
19 June 2011	Santa Rosa, MX	daily low min	15.6 C (60.1 F)	2.2 C (4.0 F)	8 years	19 of 100 (Routine)
18 June 2011	Santa Rosa, MX	daily high max (Tie)	42.8 C (109.0 F)	tie	5 years	1 of 100 (Routine)

Climate Trend

32 complete years, 1956 to 1997

One stripe for each of 32 complete years at Santa Rosa, 1956 to 1997. Blue stripes are years cooler than the station's own mean of 25.8 C (78.5 F); red stripes are warmer. The coolest year was 1964, at 25.3 C (77.5 F), and the warmest was 1972, at 26.6 C (79.9 F). The strongest colour marks a difference of 0.8 C (1.4 F).

Annual mean temperature at Santa Rosa as warming stripes, 1956 to 1997
Year	Annual mean temperature	Difference from the station mean
1956	25.5 C	-0.38 C
1958	25.5 C	-0.33 C
1959	25.6 C	-0.20 C
1960	26.0 C	+0.19 C
1962	25.9 C	+0.09 C
1964	25.3 C	-0.55 C
1965	25.7 C	-0.15 C
1966	25.6 C	-0.23 C
1967	25.4 C	-0.47 C
1968	25.6 C	-0.26 C
1969	26.5 C	+0.65 C
1970	25.8 C	-0.07 C
1971	25.8 C	-0.04 C
1972	26.6 C	+0.76 C
1973	25.8 C	-0.03 C
1974	25.9 C	+0.04 C
1975	25.6 C	-0.25 C
1976	25.6 C	-0.24 C
1977	25.9 C	+0.09 C
1979	26.2 C	+0.34 C
1980	25.9 C	+0.11 C
1981	26.1 C	+0.26 C
1982	26.4 C	+0.59 C
1983	25.4 C	-0.43 C
1984	25.7 C	-0.14 C
1985	25.7 C	-0.10 C
1986	26.0 C	+0.19 C
1987	25.6 C	-0.28 C
1988	25.9 C	+0.11 C
1989	26.3 C	+0.49 C
1993	26.3 C	+0.50 C
1997	25.7 C	-0.15 C

The fitted trend in annual mean temperature here over 1956 to 1997 is 0.10 C (-0.01 to 0.21) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.18 F (-0.02 to 0.38) per decade. The slope is a straight line fitted to 32 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	0.10 C (-0.01 to 0.21) per decade	0.18 F (-0.02 to 0.38) per decade	1956 to 1997	32	Not clearly different from zero
Mean daily maximum	0.3 C (0.1 to 0.5) per decade	0.5 F (0.2 to 0.9) per decade	1956 to 1997	32	Rise
Mean daily minimum	-0.10 C (-0.24 to 0.04) per decade	-0.2 F (-0.4 to 0.1) per decade	1956 to 1997	32	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

1955 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)	45.0 C (113.0 F)	1982	43.3 C (109.9 F)	57
Coldest night (TNn)	0.0 C (32.0 F)	1997	6.7 C (44.1 F)	57
Wettest day (Rx1day)	120.4 mm (4.7 in)	1976	61.5 mm (2.4 in)	57
Wettest five days (Rx5day)	191.8 mm (7.6 in)	1976	113.1 mm (4.5 in)	57
Longest dry spell (CDD)	166 days	1960	91 days	57

Hottest day (TXx)

The hottest day of the year at Santa Rosa, 1955 to 2012. The record is 45.0 C (113.0 F) in 1982, marked on the chart; the median year is 43.3 C (109.9 F).

Hottest day (TXx) at Santa Rosa by year
Year	Hottest day (TXx)
1955	42.8 C (109.0 F)
1956	43.3 C (109.9 F)
1957	43.9 C (111.0 F)
1958	42.8 C (109.0 F)
1959	40.6 C (105.1 F)
1960	43.3 C (109.9 F)
1961	43.9 C (111.0 F)
1962	42.8 C (109.0 F)
1963	42.8 C (109.0 F)
1964	42.8 C (109.0 F)
1965	42.2 C (108.0 F)
1966	41.7 C (107.1 F)
1967	42.8 C (109.0 F)
1968	42.8 C (109.0 F)
1969	44.4 C (111.9 F)
1970	42.2 C (108.0 F)
1971	42.2 C (108.0 F)
1972	42.2 C (108.0 F)
1973	43.3 C (109.9 F)
1974	42.2 C (108.0 F)
1975	41.7 C (107.1 F)
1976	42.2 C (108.0 F)
1977	41.7 C (107.1 F)
1978	44.4 C (111.9 F)
1979	42.8 C (109.0 F)
1980	43.9 C (111.0 F)
1981	42.8 C (109.0 F)
1982	45.0 C (113.0 F)
1983	44.4 C (111.9 F)
1984	43.3 C (109.9 F)
1985	43.9 C (111.0 F)
1986	43.9 C (111.0 F)
1987	41.7 C (107.1 F)
1988	44.4 C (111.9 F)
1989	44.4 C (111.9 F)
1991	42.8 C (109.0 F)
1992	43.9 C (111.0 F)
1993	43.9 C (111.0 F)
1994	43.9 C (111.0 F)
1995	45.0 C (113.0 F)
1996	45.0 C (113.0 F)
1997	42.8 C (109.0 F)
1998	44.4 C (111.9 F)
1999	45.0 C (113.0 F)
2000	44.4 C (111.9 F)
2001	43.9 C (111.0 F)
2002	45.0 C (113.0 F)
2003	43.9 C (111.0 F)
2004	41.7 C (107.1 F)
2005	45.0 C (113.0 F)
2006	45.0 C (113.0 F)
2007	43.9 C (111.0 F)
2008	43.3 C (109.9 F)
2009	43.9 C (111.0 F)
2010	43.9 C (111.0 F)
2011	43.9 C (111.0 F)
2012	35.0 C (95.0 F)

Coldest night (TNn)

The coldest night of the year at Santa Rosa, 1955 to 2012. The record is 0.0 C (32.0 F) in 1997, marked on the chart; the median year is 6.7 C (44.1 F).

Coldest night (TNn) at Santa Rosa by year
Year	Coldest night (TNn)
1955	5.0 C (41.0 F)
1956	3.3 C (37.9 F)
1957	6.1 C (43.0 F)
1958	6.1 C (43.0 F)
1959	5.0 C (41.0 F)
1960	4.4 C (39.9 F)
1961	5.0 C (41.0 F)
1962	5.0 C (41.0 F)
1963	8.3 C (46.9 F)
1964	7.2 C (45.0 F)
1965	7.8 C (46.0 F)
1966	6.7 C (44.1 F)
1967	5.0 C (41.0 F)
1968	8.9 C (48.0 F)
1969	7.8 C (46.0 F)
1970	6.7 C (44.1 F)
1971	6.7 C (44.1 F)
1972	8.3 C (46.9 F)
1973	7.2 C (45.0 F)
1974	8.9 C (48.0 F)
1975	7.2 C (45.0 F)
1976	6.1 C (43.0 F)
1977	8.3 C (46.9 F)
1978	7.8 C (46.0 F)
1979	5.6 C (42.1 F)
1980	6.7 C (44.1 F)
1981	6.7 C (44.1 F)
1982	8.3 C (46.9 F)
1983	6.1 C (43.0 F)
1984	9.4 C (48.9 F)
1985	5.0 C (41.0 F)
1986	7.2 C (45.0 F)
1987	6.7 C (44.1 F)
1988	5.0 C (41.0 F)
1989	7.2 C (45.0 F)
1991	5.6 C (42.1 F)
1992	6.1 C (43.0 F)
1993	7.8 C (46.0 F)
1994	7.8 C (46.0 F)
1995	8.9 C (48.0 F)
1996	6.7 C (44.1 F)
1997	0.0 C (32.0 F)
1998	6.1 C (43.0 F)
1999	5.0 C (41.0 F)
2000	6.7 C (44.1 F)
2001	6.7 C (44.1 F)
2002	5.6 C (42.1 F)
2003	5.0 C (41.0 F)
2004	6.7 C (44.1 F)
2005	8.9 C (48.0 F)
2006	6.7 C (44.1 F)
2007	9.4 C (48.9 F)
2008	6.7 C (44.1 F)
2009	7.8 C (46.0 F)
2010	6.1 C (43.0 F)
2011	5.6 C (42.1 F)
2012	10.0 C (50.0 F)

Wettest day (Rx1day)

The wettest day of the year at Santa Rosa, 1955 to 2012. The record is 120.4 mm (4.7 in) in 1976, marked on the chart; the median year is 61.5 mm (2.4 in).

Wettest day (Rx1day) at Santa Rosa by year
Year	Wettest day (Rx1day)
1955	51.6 mm (2.0 in)
1956	44.5 mm (1.8 in)
1957	47.5 mm (1.9 in)
1958	72.4 mm (2.9 in)
1959	51.8 mm (2.0 in)
1960	64.3 mm (2.5 in)
1961	41.7 mm (1.6 in)
1962	68.1 mm (2.7 in)
1963	67.3 mm (2.6 in)
1964	70.6 mm (2.8 in)
1965	56.1 mm (2.2 in)
1966	66.3 mm (2.6 in)
1967	84.8 mm (3.3 in)
1968	61.5 mm (2.4 in)
1969	49.5 mm (1.9 in)
1970	58.9 mm (2.3 in)
1971	35.1 mm (1.4 in)
1972	46.5 mm (1.8 in)
1973	60.7 mm (2.4 in)
1974	77.0 mm (3.0 in)
1975	65.8 mm (2.6 in)
1976	120.4 mm (4.7 in)
1977	64.3 mm (2.5 in)
1978	79.0 mm (3.1 in)
1979	74.2 mm (2.9 in)
1980	46.7 mm (1.8 in)
1981	73.9 mm (2.9 in)
1982	61.0 mm (2.4 in)
1983	74.4 mm (2.9 in)
1984	98.6 mm (3.9 in)
1985	69.6 mm (2.7 in)
1986	58.2 mm (2.3 in)
1987	39.9 mm (1.6 in)
1988	82.3 mm (3.2 in)
1989	61.7 mm (2.4 in)
1991	49.0 mm (1.9 in)
1992	72.4 mm (2.9 in)
1993	67.3 mm (2.6 in)
1994	53.1 mm (2.1 in)
1995	78.5 mm (3.1 in)
1996	84.8 mm (3.3 in)
1997	59.9 mm (2.4 in)
1998	38.1 mm (1.5 in)
1999	81.0 mm (3.2 in)
2000	45.0 mm (1.8 in)
2001	53.6 mm (2.1 in)
2002	40.1 mm (1.6 in)
2003	54.1 mm (2.1 in)
2004	115.3 mm (4.5 in)
2005	70.9 mm (2.8 in)
2006	47.0 mm (1.9 in)
2007	63.0 mm (2.5 in)
2008	77.0 mm (3.0 in)
2009	49.5 mm (1.9 in)
2010	59.2 mm (2.3 in)
2011	48.3 mm (1.9 in)
2012	0.0 mm (0.00 in)

Wettest five days (Rx5day)

The wettest five days of the year at Santa Rosa, 1955 to 2012. The record is 191.8 mm (7.6 in) in 1976, marked on the chart; the median year is 113.1 mm (4.5 in).

Wettest five days (Rx5day) at Santa Rosa by year
Year	Wettest five days (Rx5day)
1955	118.1 mm (4.6 in)
1956	125.2 mm (4.9 in)
1957	84.9 mm (3.3 in)
1958	152.9 mm (6.0 in)
1959	92.6 mm (3.6 in)
1960	161.6 mm (6.4 in)
1961	99.0 mm (3.9 in)
1962	112.5 mm (4.4 in)
1963	86.7 mm (3.4 in)
1964	125.0 mm (4.9 in)
1965	118.8 mm (4.7 in)
1966	106.5 mm (4.2 in)
1967	113.1 mm (4.5 in)
1968	96.5 mm (3.8 in)
1969	113.1 mm (4.5 in)
1970	122.4 mm (4.8 in)
1971	94.5 mm (3.7 in)
1972	97.3 mm (3.8 in)
1973	109.0 mm (4.3 in)
1974	94.7 mm (3.7 in)
1975	147.6 mm (5.8 in)
1976	191.8 mm (7.6 in)
1977	178.4 mm (7.0 in)
1978	114.4 mm (4.5 in)
1979	133.2 mm (5.2 in)
1980	110.2 mm (4.3 in)
1981	171.6 mm (6.8 in)
1982	139.1 mm (5.5 in)
1983	94.5 mm (3.7 in)
1984	142.0 mm (5.6 in)
1985	151.2 mm (6.0 in)
1986	105.2 mm (4.1 in)
1987	86.7 mm (3.4 in)
1988	120.8 mm (4.8 in)
1989	105.2 mm (4.1 in)
1991	103.6 mm (4.1 in)
1992	114.0 mm (4.5 in)
1993	132.4 mm (5.2 in)
1994	77.9 mm (3.1 in)
1995	110.2 mm (4.3 in)
1996	113.8 mm (4.5 in)
1997	142.7 mm (5.6 in)
1998	135.0 mm (5.3 in)
1999	133.0 mm (5.2 in)
2000	103.4 mm (4.1 in)
2001	99.3 mm (3.9 in)
2002	93.5 mm (3.7 in)
2003	137.2 mm (5.4 in)
2004	168.9 mm (6.6 in)
2005	106.0 mm (4.2 in)
2006	78.5 mm (3.1 in)
2007	124.3 mm (4.9 in)
2008	128.8 mm (5.1 in)
2009	88.3 mm (3.5 in)
2010	134.7 mm (5.3 in)
2011	110.5 mm (4.4 in)
2012	0.0 mm (0.00 in)

Longest dry spell (CDD)

The longest dry spell of the year at Santa Rosa, 1955 to 2012. The record is 166 days in 1960, marked on the chart; the median year is 91 days.

Longest dry spell (CDD) at Santa Rosa by year
Year	Longest dry spell (CDD)
1955	72 days
1956	95 days
1957	148 days
1958	73 days
1959	97 days
1960	166 days
1961	68 days
1962	70 days
1963	58 days
1964	112 days
1965	67 days
1966	73 days
1967	65 days
1968	55 days
1969	147 days
1970	70 days
1971	137 days
1972	143 days
1973	62 days
1974	69 days
1975	109 days
1976	102 days
1977	101 days
1978	58 days
1979	110 days
1980	52 days
1981	72 days
1982	160 days
1983	69 days
1984	91 days
1985	139 days
1986	112 days
1987	52 days
1988	95 days
1989	145 days
1991	82 days
1992	108 days
1993	101 days
1994	106 days
1995	80 days
1996	152 days
1997	33 days
1998	159 days
1999	120 days
2000	127 days
2001	85 days
2002	76 days
2003	74 days
2004	63 days
2005	66 days
2006	132 days
2007	91 days
2008	103 days
2009	105 days
2010	87 days
2011	118 days
2012	17 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

43 years, 1956 to 2011

A day with at least 64.1 mm (2.5 in) of rain is expected about once in 2 years. A day with at least 116.3 mm (4.6 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	64.1 mm (2.5 in)
5 years	80.5 mm (3.2 in)
10 years	90.3 mm (3.6 in)
25 years	101.6 mm (4.0 in)
50 years	109.3 mm (4.3 in)	Longer than the 43 years of record
100 years	116.3 mm (4.6 in)	Longer than the 43 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, 43 years of values from 1956 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: 120.4 mm (4.7 in) in 1976; 115.3 mm (4.5 in) in 2004; 98.6 mm (3.9 in) in 1984.

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 2026-10-14 (14 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).