Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at San Carlos. 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 Carlos, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
40.0 C (104.0 F)
-7.8 C (18.0 F)
n/a
n/a
Feb
37.8 C (100.0 F)
-7.8 C (18.0 F)
n/a
n/a
Mar
41.7 C (107.1 F)
-5.0 C (23.0 F)
n/a
n/a
Apr
42.8 C (109.0 F)
0.0 C (32.0 F)
n/a
n/a
May
45.6 C (114.1 F)
5.6 C (42.1 F)
n/a
n/a
Jun
45.6 C (114.1 F)
10.0 C (50.0 F)
n/a
n/a
Jul
45.0 C (113.0 F)
13.3 C (55.9 F)
n/a
n/a
Aug
43.9 C (111.0 F)
12.2 C (54.0 F)
n/a
n/a
Sep
46.7 C (116.1 F)
5.0 C (41.0 F)
n/a
n/a
Oct
38.9 C (102.0 F)
0.0 C (32.0 F)
n/a
n/a
Nov
36.7 C (98.1 F)
-7.2 C (19.0 F)
n/a
n/a
Dec
35.0 C (95.0 F)
-7.2 C (19.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at San Carlos still stand. 1963 holds the most, with 117.
Standing records at San Carlos by the year they were set
Year set
Standing records
1962
75
1963
117
1964
41
1965
34
1966
27
1967
48
1968
25
1969
41
1970
26
1971
22
1972
20
1973
40
1974
22
1975
32
1976
49
1977
23
1978
22
1979
26
1980
21
1981
21
1982
25
1983
40
1984
19
1985
21
1986
27
1987
24
1988
21
1989
36
1990
22
1991
23
1992
25
1993
18
1994
18
1995
30
1996
22
1997
35
1998
45
1999
22
2000
27
2001
17
2002
19
2003
16
2004
11
2005
15
2006
12
2007
19
2008
30
2009
15
2010
52
2011
26
All-Time Record Progression
3 new records
3 all-time records were set at San Carlos between 27 June 1998 and 12 September 2010. Each dot is a new record.
When San Carlos set new all-time records
Date
Kind
Detail
1998-06-27
Record daily precipitation
Record daily precipitation 190.5 mm (7.5 in)
2005-07-19
Record daily precipitation
Record daily precipitation 283.5 mm (11.2 in)
2010-09-12
Record high maximum temperature
Record high maximum temperature 46.7 C (116.1 F)
Wettest Day of Each Month
Jul: 283.5 mm (11.2 in)
The wettest day on record for each calendar month at San Carlos. The most was 283.5 mm (11.2 in) on 19 July 2005.
Record daily precipitation for each month at San Carlos
Month
Record daily precipitation (mm)
Date
Jan
39.9 mm (1.6 in)
8 January 1984
Feb
79.0 mm (3.1 in)
2 February 2000
Mar
74.9 mm (2.9 in)
11 March 1997
Apr
99.8 mm (3.9 in)
29 April 1977
May
89.9 mm (3.5 in)
21 May 1964
Jun
190.5 mm (7.5 in)
27 June 1998
Jul
283.5 mm (11.2 in)
19 July 2005
Aug
185.4 mm (7.3 in)
22 August 1967
Sep
172.0 mm (6.8 in)
15 September 1988
Oct
151.6 mm (6.0 in)
13 October 2003
Nov
98.6 mm (3.9 in)
30 November 2009
Dec
79.8 mm (3.1 in)
8 December 1982
Period of Record Coverage
1962 to 2011
Complete yearUnder 90 percent of days
50 years of record at San Carlos, 1962 to 2011. 7 years have data for under 90 percent of days and are left out of rankings: 1962, 1964, 1967, 1993, 2005, 2007, 2011.
Cooler than the station meanWarmer than the station mean
One stripe for each of 38 complete years at San Carlos, 1963 to 2010. Blue stripes are years cooler than the station's own mean of 22.2 C (72.0 F); red stripes are warmer. The coolest year was 1976, at 20.3 C (68.5 F), and the warmest was 1963, at 25.6 C (78.0 F). The strongest colour marks a difference of 3.4 C (6.1 F).
Annual mean temperature at San Carlos as warming stripes, 1963 to 2010
Year
Annual mean temperature
Difference from the station mean
1963
25.6 C
+3.34 C
1965
23.9 C
+1.70 C
1966
22.3 C
+0.05 C
1968
23.1 C
+0.88 C
1970
21.4 C
-0.81 C
1971
22.3 C
+0.12 C
1972
21.9 C
-0.35 C
1973
21.2 C
-0.98 C
1974
21.7 C
-0.52 C
1975
21.5 C
-0.67 C
1976
20.3 C
-1.95 C
1977
21.4 C
-0.78 C
1978
21.3 C
-0.95 C
1979
21.2 C
-1.06 C
1980
21.8 C
-0.43 C
1981
21.9 C
-0.32 C
1982
22.6 C
+0.37 C
1984
22.2 C
-0.03 C
1985
22.2 C
-0.03 C
1986
22.7 C
+0.52 C
1987
21.4 C
-0.79 C
1989
22.2 C
-0.01 C
1990
22.5 C
+0.31 C
1991
22.2 C
0.00 C
1992
21.7 C
-0.56 C
1994
23.1 C
+0.88 C
1995
22.7 C
+0.47 C
1996
22.4 C
+0.15 C
1997
21.4 C
-0.86 C
1998
24.1 C
+1.93 C
1999
22.7 C
+0.50 C
2000
22.8 C
+0.63 C
2001
22.6 C
+0.37 C
2002
22.0 C
-0.17 C
2003
21.7 C
-0.56 C
2006
22.3 C
+0.11 C
2009
22.7 C
+0.50 C
2010
21.4 C
-0.86 C
The fitted trend in annual mean temperature here over 1963 to 2010 is -0.03 C (-0.27 to 0.22) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.05 F (-0.49 to 0.39) per decade. The slope is a straight line fitted to 38 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at San Carlos
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.03 C (-0.27 to 0.22) per decade
-0.05 F (-0.49 to 0.39) per decade
1963 to 2010
38
Not clearly different from zero
Mean daily maximum
0.1 C (-0.3 to 0.4) per decade
0.1 F (-0.5 to 0.7) per decade
1963 to 2010
38
Not clearly different from zero
Mean daily minimum
-0.1 C (-0.3 to 0.1) per decade
-0.2 F (-0.6 to 0.1) per decade
1963 to 2010
38
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
1961 to 2011
Yearly extremes at San Carlos: 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)
2010
41.7 C (107.1 F)
50
Coldest night (TNn)
-7.8 C (18.0 F)
1975
-2.2 C (28.0 F)
50
Wettest day (Rx1day)
283.5 mm (11.2 in)
2005
77.0 mm (3.0 in)
51
Wettest five days (Rx5day)
413.3 mm (16.3 in)
1967
124.1 mm (4.9 in)
51
Longest dry spell (CDD)
100 days
1962
52 days
51
Hottest day (TXx)
The hottest day of the year at San Carlos, 1961 to 2011. The record is 46.7 C (116.1 F) in 2010, marked on the chart; the median year is 41.7 C (107.1 F).
Hottest day (TXx) at San Carlos by year
Year
Hottest day (TXx)
1961
n/a
1962
40.6 C (105.1 F)
1963
41.7 C (107.1 F)
1964
41.7 C (107.1 F)
1965
41.7 C (107.1 F)
1966
42.8 C (109.0 F)
1967
45.0 C (113.0 F)
1968
41.7 C (107.1 F)
1969
43.9 C (111.0 F)
1970
41.1 C (106.0 F)
1971
43.9 C (111.0 F)
1972
40.0 C (104.0 F)
1973
43.3 C (109.9 F)
1974
40.0 C (104.0 F)
1975
45.6 C (114.1 F)
1976
39.4 C (102.9 F)
1977
40.6 C (105.1 F)
1978
41.7 C (107.1 F)
1979
38.9 C (102.0 F)
1980
40.6 C (105.1 F)
1981
40.6 C (105.1 F)
1982
40.6 C (105.1 F)
1983
41.7 C (107.1 F)
1984
42.8 C (109.0 F)
1985
39.4 C (102.9 F)
1986
40.0 C (104.0 F)
1987
38.9 C (102.0 F)
1988
42.8 C (109.0 F)
1989
41.7 C (107.1 F)
1990
40.6 C (105.1 F)
1991
41.7 C (107.1 F)
1992
38.9 C (102.0 F)
1993
39.4 C (102.9 F)
1994
40.6 C (105.1 F)
1995
44.4 C (111.9 F)
1996
41.7 C (107.1 F)
1997
39.4 C (102.9 F)
1998
45.6 C (114.1 F)
1999
41.7 C (107.1 F)
2000
42.2 C (108.0 F)
2001
41.7 C (107.1 F)
2002
42.2 C (108.0 F)
2003
42.2 C (108.0 F)
2004
40.0 C (104.0 F)
2005
40.0 C (104.0 F)
2006
40.0 C (104.0 F)
2007
36.7 C (98.1 F)
2008
40.6 C (105.1 F)
2009
40.6 C (105.1 F)
2010
46.7 C (116.1 F)
2011
42.8 C (109.0 F)
Coldest night (TNn)
The coldest night of the year at San Carlos, 1961 to 2011. The record is -7.8 C (18.0 F) in 1975, marked on the chart; the median year is -2.2 C (28.0 F).
Coldest night (TNn) at San Carlos by year
Year
Coldest night (TNn)
1961
n/a
1962
2.8 C (37.0 F)
1963
0.0 C (32.0 F)
1964
2.2 C (36.0 F)
1965
0.6 C (33.1 F)
1966
0.0 C (32.0 F)
1967
0.0 C (32.0 F)
1968
-0.6 C (30.9 F)
1969
-7.2 C (19.0 F)
1970
-4.4 C (24.1 F)
1971
-2.8 C (27.0 F)
1972
-1.1 C (30.0 F)
1973
-5.0 C (23.0 F)
1974
-5.0 C (23.0 F)
1975
-7.8 C (18.0 F)
1976
-7.8 C (18.0 F)
1977
-7.2 C (19.0 F)
1978
-5.0 C (23.0 F)
1979
-2.8 C (27.0 F)
1980
-1.1 C (30.0 F)
1981
-1.7 C (28.9 F)
1982
-4.4 C (24.1 F)
1983
-5.6 C (21.9 F)
1984
-3.3 C (26.1 F)
1985
-4.4 C (24.1 F)
1986
-3.3 C (26.1 F)
1987
-2.2 C (28.0 F)
1988
-2.2 C (28.0 F)
1989
-5.0 C (23.0 F)
1990
-2.2 C (28.0 F)
1991
-1.1 C (30.0 F)
1992
-1.1 C (30.0 F)
1993
0.0 C (32.0 F)
1994
0.0 C (32.0 F)
1995
-1.1 C (30.0 F)
1996
-1.1 C (30.0 F)
1997
-2.2 C (28.0 F)
1998
-3.3 C (26.1 F)
1999
0.0 C (32.0 F)
2000
-1.1 C (30.0 F)
2001
0.6 C (33.1 F)
2002
0.0 C (32.0 F)
2003
0.0 C (32.0 F)
2004
0.6 C (33.1 F)
2005
-6.1 C (21.0 F)
2006
-3.3 C (26.1 F)
2007
-5.0 C (23.0 F)
2008
-6.7 C (19.9 F)
2009
-2.2 C (28.0 F)
2010
-4.4 C (24.1 F)
2011
-5.0 C (23.0 F)
Wettest day (Rx1day)
The wettest day of the year at San Carlos, 1961 to 2011. The record is 283.5 mm (11.2 in) in 2005, marked on the chart; the median year is 77.0 mm (3.0 in).
Wettest day (Rx1day) at San Carlos by year
Year
Wettest day (Rx1day)
1961
62.0 mm (2.4 in)
1962
65.8 mm (2.6 in)
1963
74.9 mm (2.9 in)
1964
89.9 mm (3.5 in)
1965
47.0 mm (1.9 in)
1966
119.9 mm (4.7 in)
1967
185.4 mm (7.3 in)
1968
59.9 mm (2.4 in)
1969
77.0 mm (3.0 in)
1970
98.8 mm (3.9 in)
1971
104.4 mm (4.1 in)
1972
88.9 mm (3.5 in)
1973
77.0 mm (3.0 in)
1974
48.3 mm (1.9 in)
1975
88.4 mm (3.5 in)
1976
51.8 mm (2.0 in)
1977
105.9 mm (4.2 in)
1978
109.0 mm (4.3 in)
1979
85.9 mm (3.4 in)
1980
54.9 mm (2.2 in)
1981
143.8 mm (5.7 in)
1982
81.3 mm (3.2 in)
1983
56.4 mm (2.2 in)
1984
39.9 mm (1.6 in)
1985
78.0 mm (3.1 in)
1986
55.9 mm (2.2 in)
1987
86.9 mm (3.4 in)
1988
172.0 mm (6.8 in)
1989
41.9 mm (1.6 in)
1990
70.9 mm (2.8 in)
1991
62.0 mm (2.4 in)
1992
55.9 mm (2.2 in)
1993
45.0 mm (1.8 in)
1994
39.9 mm (1.6 in)
1995
127.8 mm (5.0 in)
1996
144.8 mm (5.7 in)
1997
74.9 mm (2.9 in)
1998
190.5 mm (7.5 in)
1999
72.1 mm (2.8 in)
2000
79.0 mm (3.1 in)
2001
57.9 mm (2.3 in)
2002
106.4 mm (4.2 in)
2003
151.6 mm (6.0 in)
2004
143.3 mm (5.6 in)
2005
283.5 mm (11.2 in)
2006
64.8 mm (2.6 in)
2007
51.8 mm (2.0 in)
2008
67.3 mm (2.6 in)
2009
98.6 mm (3.9 in)
2010
37.1 mm (1.5 in)
2011
79.8 mm (3.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at San Carlos, 1961 to 2011. The record is 413.3 mm (16.3 in) in 1967, marked on the chart; the median year is 124.1 mm (4.9 in).
Wettest five days (Rx5day) at San Carlos by year
Year
Wettest five days (Rx5day)
1961
74.4 mm (2.9 in)
1962
140.7 mm (5.5 in)
1963
138.5 mm (5.5 in)
1964
280.2 mm (11.0 in)
1965
65.6 mm (2.6 in)
1966
220.7 mm (8.7 in)
1967
413.3 mm (16.3 in)
1968
132.4 mm (5.2 in)
1969
124.1 mm (4.9 in)
1970
210.0 mm (8.3 in)
1971
153.5 mm (6.0 in)
1972
202.5 mm (8.0 in)
1973
117.3 mm (4.6 in)
1974
116.2 mm (4.6 in)
1975
207.5 mm (8.2 in)
1976
141.3 mm (5.6 in)
1977
207.8 mm (8.2 in)
1978
179.7 mm (7.1 in)
1979
107.2 mm (4.2 in)
1980
106.7 mm (4.2 in)
1981
176.7 mm (7.0 in)
1982
95.3 mm (3.8 in)
1983
106.2 mm (4.2 in)
1984
86.3 mm (3.4 in)
1985
91.8 mm (3.6 in)
1986
91.7 mm (3.6 in)
1987
121.4 mm (4.8 in)
1988
323.4 mm (12.7 in)
1989
90.7 mm (3.6 in)
1990
99.9 mm (3.9 in)
1991
62.8 mm (2.5 in)
1992
72.4 mm (2.9 in)
1993
45.0 mm (1.8 in)
1994
84.6 mm (3.3 in)
1995
191.6 mm (7.5 in)
1996
328.0 mm (12.9 in)
1997
130.6 mm (5.1 in)
1998
200.7 mm (7.9 in)
1999
114.6 mm (4.5 in)
2000
99.2 mm (3.9 in)
2001
92.7 mm (3.6 in)
2002
172.4 mm (6.8 in)
2003
206.8 mm (8.1 in)
2004
146.1 mm (5.8 in)
2005
323.2 mm (12.7 in)
2006
85.6 mm (3.4 in)
2007
126.8 mm (5.0 in)
2008
104.9 mm (4.1 in)
2009
106.0 mm (4.2 in)
2010
101.9 mm (4.0 in)
2011
197.7 mm (7.8 in)
Longest dry spell (CDD)
The longest dry spell of the year at San Carlos, 1961 to 2011. The record is 100 days in 1962, marked on the chart; the median year is 52 days.
Longest dry spell (CDD) at San Carlos by year
Year
Longest dry spell (CDD)
1961
37 days
1962
100 days
1963
65 days
1964
67 days
1965
52 days
1966
47 days
1967
46 days
1968
34 days
1969
32 days
1970
55 days
1971
75 days
1972
28 days
1973
37 days
1974
47 days
1975
66 days
1976
42 days
1977
42 days
1978
27 days
1979
57 days
1980
39 days
1981
30 days
1982
61 days
1983
69 days
1984
68 days
1985
33 days
1986
40 days
1987
51 days
1988
78 days
1989
68 days
1990
79 days
1991
48 days
1992
41 days
1993
52 days
1994
88 days
1995
68 days
1996
70 days
1997
59 days
1998
64 days
1999
73 days
2000
47 days
2001
82 days
2002
57 days
2003
30 days
2004
48 days
2005
34 days
2006
40 days
2007
44 days
2008
33 days
2009
64 days
2010
96 days
2011
57 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
21 years with a frost
Across 21 years with a frost, the median last spring frost at San Carlos falls on 23 February and the median first autumn frost on 29 November, which leaves a median of 283 days between them.
Frost dates and growing season at San Carlos
Measure
Median, all years
Earliest period
Recent period (1968 to 2010)
Recent against earliest
Fitted trend
Last spring frost
23 February
n/a
23 February
n/a
n/a
First autumn frost
29 November
n/a
29 November
n/a
n/a
Growing days
283 days
n/a
283 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
44 years, 1962 to 2010
A day with at least 75.1 mm (3.0 in) of rain is expected about once in 2 years. A day with at least 262.8 mm (10.3 in) of rain is expected about once in 100 years.
Rainfall return levels at San Carlos: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
75.1 mm (3.0 in)
5 years
109.4 mm (4.3 in)
10 years
137.5 mm (5.4 in)
25 years
180.3 mm (7.1 in)
50 years
218.5 mm (8.6 in)
Longer than the 44 years of record
100 years
262.8 mm (10.3 in)
Longer than the 44 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, 44 years of values from 1962 to 2010.
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: 283.5 mm (11.2 in) in 2005; 190.5 mm (7.5 in) in 1998; 151.6 mm (6.0 in) in 2003.
Download the Data
Data for San Carlos standing records by year: CSV or JSON. Field meanings are on the data page.
Data for San Carlos 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.