Record highRecord low2026 daily maximum2026 daily minimum
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
32.8 C (91.0 F)
-14.4 C (6.1 F)
n/a
n/a
Feb
35.0 C (95.0 F)
-13.3 C (8.1 F)
n/a
n/a
Mar
36.7 C (98.1 F)
-5.0 C (23.0 F)
n/a
n/a
Apr
42.2 C (108.0 F)
-2.2 C (28.0 F)
n/a
n/a
May
44.4 C (111.9 F)
3.3 C (37.9 F)
n/a
n/a
Jun
46.7 C (116.1 F)
7.2 C (45.0 F)
n/a
n/a
Jul
46.7 C (116.1 F)
11.1 C (52.0 F)
n/a
n/a
Aug
44.4 C (111.9 F)
12.8 C (55.0 F)
n/a
n/a
Sep
44.4 C (111.9 F)
8.9 C (48.0 F)
n/a
n/a
Oct
42.2 C (108.0 F)
-2.2 C (28.0 F)
n/a
n/a
Nov
35.6 C (96.1 F)
-7.2 C (19.0 F)
n/a
n/a
Dec
30.0 C (86.0 F)
-8.3 C (17.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Santa Rosa still stand. 2012 holds the most, with 98.
Standing records at Santa Rosa by the year they were set
Year set
Standing records
1982
46
1983
60
1984
35
1985
71
1986
55
1987
58
1988
55
1989
53
1990
62
1991
54
1992
42
1993
42
1994
50
1995
65
1996
44
1997
46
1998
44
1999
54
2000
58
2001
33
2002
32
2003
37
2004
37
2005
33
2006
40
2007
28
2008
24
2009
34
2010
24
2011
37
2012
98
2013
13
All-Time Record Progression
3 new records
3 all-time records were set at Santa Rosa between 22 June 2012 and 15 January 2013. Each dot is a new record.
When Santa Rosa set new all-time records
Date
Kind
Detail
2012-06-22
Record high minimum temperature
Record high minimum temperature 28.9 C (84.0 F)
2012-06-23
Record high minimum temperature
Record high minimum temperature 30.0 C (86.0 F)
2013-01-15
Record low minimum temperature
Record low minimum temperature -14.4 C (6.1 F)
Wettest Day of Each Month
Oct: 118.9 mm (4.7 in)
The wettest day on record for each calendar month at Santa Rosa. The most was 118.9 mm (4.7 in) on 4 October 1989.
Record daily precipitation for each month at Santa Rosa
Month
Record daily precipitation (mm)
Date
Jan
46.5 mm (1.8 in)
29 January 1983
Feb
29.0 mm (1.1 in)
3 February 1998
Mar
39.9 mm (1.6 in)
6 March 2000
Apr
22.9 mm (0.9 in)
5 April 2001
May
19.8 mm (0.8 in)
20 May 2009
Jun
30.5 mm (1.2 in)
24 June 2008
Jul
63.8 mm (2.5 in)
7 July 1999
Aug
56.4 mm (2.2 in)
23 August 1992
Sep
78.0 mm (3.1 in)
3 September 2012
Oct
118.9 mm (4.7 in)
4 October 1989
Nov
44.5 mm (1.8 in)
11 November 1994
Dec
31.0 mm (1.2 in)
13 December 2012
Period of Record Coverage
1982 to 2013
Complete yearUnder 90 percent of days
32 years of record at Santa Rosa, 1982 to 2013. 3 years have data for under 90 percent of days and are left out of rankings: 2008, 2012, 2013.
Cooler than the station meanWarmer than the station mean
One stripe for each of 24 complete years at Santa Rosa, 1982 to 2011. Blue stripes are years cooler than the station's own mean of 20.5 C (68.9 F); red stripes are warmer. The coolest year was 1983, at 19.8 C (67.7 F), and the warmest was 2011, at 21.5 C (70.6 F). The strongest colour marks a difference of 1.0 C (1.8 F).
Annual mean temperature at Santa Rosa as warming stripes, 1982 to 2011
Year
Annual mean temperature
Difference from the station mean
1982
19.9 C
-0.62 C
1983
19.8 C
-0.69 C
1984
20.0 C
-0.52 C
1985
20.2 C
-0.30 C
1986
20.8 C
+0.31 C
1987
20.2 C
-0.34 C
1988
20.5 C
+0.02 C
1989
21.1 C
+0.59 C
1990
20.2 C
-0.34 C
1991
20.0 C
-0.55 C
1992
20.3 C
-0.16 C
1993
20.6 C
+0.14 C
1994
20.9 C
+0.43 C
1995
20.9 C
+0.44 C
1996
21.1 C
+0.61 C
1997
20.6 C
+0.11 C
1999
20.3 C
-0.16 C
2000
20.8 C
+0.30 C
2001
20.4 C
-0.15 C
2004
20.1 C
-0.37 C
2005
20.8 C
+0.27 C
2006
20.4 C
-0.11 C
2007
20.7 C
+0.18 C
2011
21.5 C
+0.95 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
1982 to 2013
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)
46.7 C (116.1 F)
1995
44.7 C (112.5 F)
32
Coldest night (TNn)
-14.4 C (6.1 F)
2013
-5.0 C (23.0 F)
32
Wettest day (Rx1day)
118.9 mm (4.7 in)
1989
43.7 mm (1.7 in)
32
Wettest five days (Rx5day)
120.5 mm (4.7 in)
1989
64.3 mm (2.5 in)
32
Longest dry spell (CDD)
155 days
2002
92 days
32
Hottest day (TXx)
The hottest day of the year at Santa Rosa, 1982 to 2013. The record is 46.7 C (116.1 F) in 1995, marked on the chart; the median year is 44.7 C (112.5 F).
Hottest day (TXx) at Santa Rosa by year
Year
Hottest day (TXx)
1982
43.3 C (109.9 F)
1983
45.0 C (113.0 F)
1984
43.9 C (111.0 F)
1985
45.0 C (113.0 F)
1986
42.8 C (109.0 F)
1987
44.4 C (111.9 F)
1988
45.0 C (113.0 F)
1989
45.6 C (114.1 F)
1990
45.6 C (114.1 F)
1991
42.8 C (109.0 F)
1992
45.0 C (113.0 F)
1993
45.0 C (113.0 F)
1994
45.6 C (114.1 F)
1995
46.7 C (116.1 F)
1996
44.4 C (111.9 F)
1997
45.0 C (113.0 F)
1998
45.0 C (113.0 F)
1999
42.8 C (109.0 F)
2000
44.4 C (111.9 F)
2001
45.0 C (113.0 F)
2002
45.0 C (113.0 F)
2003
43.9 C (111.0 F)
2004
43.9 C (111.0 F)
2005
45.0 C (113.0 F)
2006
43.9 C (111.0 F)
2007
45.0 C (113.0 F)
2008
43.9 C (111.0 F)
2009
42.8 C (109.0 F)
2010
42.8 C (109.0 F)
2011
43.9 C (111.0 F)
2012
46.7 C (116.1 F)
2013
26.7 C (80.1 F)
Coldest night (TNn)
The coldest night of the year at Santa Rosa, 1982 to 2013. The record is -14.4 C (6.1 F) in 2013, marked on the chart; the median year is -5.0 C (23.0 F).
Coldest night (TNn) at Santa Rosa by year
Year
Coldest night (TNn)
1982
-3.3 C (26.1 F)
1983
-1.7 C (28.9 F)
1984
-2.2 C (28.0 F)
1985
-6.1 C (21.0 F)
1986
-2.8 C (27.0 F)
1987
-6.7 C (19.9 F)
1988
-8.3 C (17.1 F)
1989
-5.0 C (23.0 F)
1990
-6.1 C (21.0 F)
1991
-4.4 C (24.1 F)
1992
-3.9 C (25.0 F)
1993
-4.4 C (24.1 F)
1994
-4.4 C (24.1 F)
1995
-2.2 C (28.0 F)
1996
-4.4 C (24.1 F)
1997
-5.0 C (23.0 F)
1998
-5.6 C (21.9 F)
1999
-5.0 C (23.0 F)
2000
-5.0 C (23.0 F)
2001
-3.9 C (25.0 F)
2002
-6.1 C (21.0 F)
2003
-8.3 C (17.1 F)
2004
-7.2 C (19.0 F)
2005
-5.6 C (21.9 F)
2006
-7.2 C (19.0 F)
2007
-9.4 C (15.1 F)
2008
-6.1 C (21.0 F)
2009
-6.1 C (21.0 F)
2010
-5.0 C (23.0 F)
2011
-13.3 C (8.1 F)
2012
-2.2 C (28.0 F)
2013
-14.4 C (6.1 F)
Wettest day (Rx1day)
The wettest day of the year at Santa Rosa, 1982 to 2013. The record is 118.9 mm (4.7 in) in 1989, marked on the chart; the median year is 43.7 mm (1.7 in).
Wettest day (Rx1day) at Santa Rosa by year
Year
Wettest day (Rx1day)
1982
42.7 mm (1.7 in)
1983
46.5 mm (1.8 in)
1984
36.6 mm (1.4 in)
1985
33.3 mm (1.3 in)
1986
28.2 mm (1.1 in)
1987
25.4 mm (1.0 in)
1988
52.8 mm (2.1 in)
1989
118.9 mm (4.7 in)
1990
50.3 mm (2.0 in)
1991
34.8 mm (1.4 in)
1992
56.4 mm (2.2 in)
1993
39.9 mm (1.6 in)
1994
44.5 mm (1.8 in)
1995
50.8 mm (2.0 in)
1996
28.7 mm (1.1 in)
1997
43.4 mm (1.7 in)
1998
43.9 mm (1.7 in)
1999
63.8 mm (2.5 in)
2000
73.9 mm (2.9 in)
2001
33.8 mm (1.3 in)
2002
41.4 mm (1.6 in)
2003
40.9 mm (1.6 in)
2004
49.8 mm (2.0 in)
2005
54.4 mm (2.1 in)
2006
65.8 mm (2.6 in)
2007
24.6 mm (1.0 in)
2008
42.9 mm (1.7 in)
2009
48.3 mm (1.9 in)
2010
54.9 mm (2.2 in)
2011
36.3 mm (1.4 in)
2012
78.0 mm (3.1 in)
2013
6.9 mm (0.27 in)
Wettest five days (Rx5day)
The wettest five days of the year at Santa Rosa, 1982 to 2013. The record is 120.5 mm (4.7 in) in 1989, marked on the chart; the median year is 64.3 mm (2.5 in).
Wettest five days (Rx5day) at Santa Rosa by year
Year
Wettest five days (Rx5day)
1982
66.3 mm (2.6 in)
1983
62.1 mm (2.4 in)
1984
52.7 mm (2.1 in)
1985
103.2 mm (4.1 in)
1986
50.4 mm (2.0 in)
1987
32.8 mm (1.3 in)
1988
55.9 mm (2.2 in)
1989
120.5 mm (4.7 in)
1990
103.7 mm (4.1 in)
1991
68.1 mm (2.7 in)
1992
76.0 mm (3.0 in)
1993
39.9 mm (1.6 in)
1994
57.5 mm (2.3 in)
1995
60.2 mm (2.4 in)
1996
36.3 mm (1.4 in)
1997
84.8 mm (3.3 in)
1998
72.5 mm (2.9 in)
1999
81.9 mm (3.2 in)
2000
111.0 mm (4.4 in)
2001
55.2 mm (2.2 in)
2002
82.8 mm (3.3 in)
2003
60.0 mm (2.4 in)
2004
53.6 mm (2.1 in)
2005
67.4 mm (2.7 in)
2006
87.4 mm (3.4 in)
2007
32.4 mm (1.3 in)
2008
78.5 mm (3.1 in)
2009
80.0 mm (3.1 in)
2010
54.9 mm (2.2 in)
2011
62.2 mm (2.4 in)
2012
114.1 mm (4.5 in)
2013
29.0 mm (1.1 in)
Longest dry spell (CDD)
The longest dry spell of the year at Santa Rosa, 1982 to 2013. The record is 155 days in 2002, marked on the chart; the median year is 92 days.
Longest dry spell (CDD) at Santa Rosa by year
Year
Longest dry spell (CDD)
1982
125 days
1983
50 days
1984
91 days
1985
66 days
1986
73 days
1987
71 days
1988
81 days
1989
81 days
1990
127 days
1991
74 days
1992
94 days
1993
94 days
1994
89 days
1995
83 days
1996
108 days
1997
95 days
1998
93 days
1999
95 days
2000
93 days
2001
74 days
2002
155 days
2003
104 days
2004
80 days
2005
127 days
2006
107 days
2007
105 days
2008
93 days
2009
89 days
2010
89 days
2011
83 days
2012
97 days
2013
25 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
24 years with a frost
Across 24 years with a frost, the median last spring frost at Santa Rosa falls on 5 March and the median first autumn frost on 23 November, which leaves a median of 264 days between them.
Frost dates and growing season at Santa Rosa
Measure
Median, all years
Earliest period
Recent period (1982 to 2011)
Recent against earliest
Fitted trend
Last spring frost
5 March
n/a
5 March
n/a
n/a
First autumn frost
23 November
n/a
23 November
n/a
n/a
Growing days
264 days
n/a
264 days
n/a
n/a
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
30 years, 1982 to 2012
A day with at least 43.9 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 115.8 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
43.9 mm (1.7 in)
5 years
59.3 mm (2.3 in)
10 years
70.9 mm (2.8 in)
25 years
87.4 mm (3.4 in)
50 years
101.0 mm (4.0 in)
Longer than the 30 years of record
100 years
115.8 mm (4.6 in)
Longer than the 30 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, 30 years of values from 1982 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: 118.9 mm (4.7 in) in 1989; 78.0 mm (3.1 in) in 2012; 73.9 mm (2.9 in) in 2000.
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.