Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at San Nicolas. 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 Nicolas, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
37.8 C (100.0 F)
-5.0 C (23.0 F)
n/a
n/a
Feb
38.9 C (102.0 F)
-7.2 C (19.0 F)
n/a
n/a
Mar
42.8 C (109.0 F)
-1.1 C (30.0 F)
n/a
n/a
Apr
45.0 C (113.0 F)
0.0 C (32.0 F)
n/a
n/a
May
41.7 C (107.1 F)
2.8 C (37.0 F)
n/a
n/a
Jun
46.7 C (116.1 F)
10.0 C (50.0 F)
n/a
n/a
Jul
41.7 C (107.1 F)
15.6 C (60.1 F)
n/a
n/a
Aug
40.0 C (104.0 F)
15.0 C (59.0 F)
n/a
n/a
Sep
38.9 C (102.0 F)
0.0 C (32.0 F)
n/a
n/a
Oct
37.8 C (100.0 F)
2.8 C (37.0 F)
n/a
n/a
Nov
36.7 C (98.1 F)
-2.2 C (28.0 F)
n/a
n/a
Dec
35.6 C (96.1 F)
-5.0 C (23.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at San Nicolas still stand. 1997 holds the most, with 88.
Standing records at San Nicolas by the year they were set
Year set
Standing records
1965
62
1966
48
1967
34
1968
23
1969
44
1970
35
1971
40
1972
35
1973
45
1974
36
1975
39
1976
55
1977
30
1978
36
1979
34
1980
38
1981
19
1982
36
1983
31
1984
30
1985
26
1986
28
1987
29
1988
32
1989
26
1990
41
1991
60
1992
17
1993
8
1994
43
1995
52
1996
44
1997
88
1998
20
1999
25
2000
16
2001
43
2002
24
2003
9
2004
9
2005
15
2006
7
2007
13
2008
21
2009
18
All-Time Record Progression
1 new records
1 all-time records were set at San Nicolas between 20 July 2005 and 20 July 2005. Each dot is a new record.
When San Nicolas set new all-time records
Date
Kind
Detail
2005-07-20
Record daily precipitation
Record daily precipitation 350.8 mm (13.8 in)
Wettest Day of Each Month
Jul: 350.8 mm (13.8 in)
The wettest day on record for each calendar month at San Nicolas. The most was 350.8 mm (13.8 in) on 20 July 2005.
Record daily precipitation for each month at San Nicolas
Month
Record daily precipitation (mm)
Date
Jan
109.2 mm (4.3 in)
1 January 1984
Feb
30.5 mm (1.2 in)
20 February 1968
Mar
74.9 mm (2.9 in)
2 March 1967
Apr
70.9 mm (2.8 in)
29 April 1968
May
99.8 mm (3.9 in)
5 May 1968
Jun
135.9 mm (5.4 in)
22 June 1973
Jul
350.8 mm (13.8 in)
20 July 2005
Aug
140.0 mm (5.5 in)
11 August 1995
Sep
339.9 mm (13.4 in)
16 September 1988
Oct
125.0 mm (4.9 in)
10 October 2007
Nov
59.9 mm (2.4 in)
30 November 2009
Dec
135.9 mm (5.4 in)
8 December 1982
Period of Record Coverage
1965 to 2009
Complete yearUnder 90 percent of days
45 years of record at San Nicolas, 1965 to 2009. 1 years have data for under 90 percent of days and are left out of rankings: 1993.
Cooler than the station meanWarmer than the station mean
One stripe for each of 40 complete years at San Nicolas, 1966 to 2008. Blue stripes are years cooler than the station's own mean of 20.9 C (69.5 F); red stripes are warmer. The coolest year was 1976, at 19.3 C (66.7 F), and the warmest was 1990, at 22.3 C (72.2 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at San Nicolas as warming stripes, 1966 to 2008
Year
Annual mean temperature
Difference from the station mean
1966
19.7 C
-1.16 C
1967
21.1 C
+0.20 C
1968
20.1 C
-0.81 C
1969
20.7 C
-0.14 C
1970
20.2 C
-0.66 C
1971
21.3 C
+0.41 C
1972
20.8 C
-0.09 C
1973
20.2 C
-0.66 C
1974
20.5 C
-0.40 C
1975
20.6 C
-0.22 C
1976
19.3 C
-1.61 C
1977
20.5 C
-0.33 C
1978
20.5 C
-0.34 C
1979
19.7 C
-1.13 C
1980
21.0 C
+0.16 C
1981
20.4 C
-0.47 C
1982
21.1 C
+0.27 C
1983
20.7 C
-0.21 C
1984
20.8 C
-0.09 C
1985
20.9 C
+0.08 C
1986
21.5 C
+0.63 C
1987
20.3 C
-0.58 C
1988
20.4 C
-0.49 C
1989
21.0 C
+0.14 C
1990
22.3 C
+1.45 C
1991
21.9 C
+1.07 C
1992
20.1 C
-0.81 C
1994
21.9 C
+1.02 C
1995
22.3 C
+1.43 C
1996
21.7 C
+0.85 C
1997
21.5 C
+0.60 C
1998
21.7 C
+0.86 C
1999
20.8 C
-0.04 C
2000
21.1 C
+0.28 C
2002
21.2 C
+0.38 C
2004
20.7 C
-0.19 C
2005
21.0 C
+0.15 C
2006
21.5 C
+0.62 C
2007
20.6 C
-0.28 C
2008
20.9 C
+0.08 C
The annual mean temperature here has risen by 0.3 C (0.1 to 0.4) per decade over 1966 to 2008. In Fahrenheit: 0.5 F (0.2 to 0.8) per decade. The slope is a straight line fitted to 40 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at San Nicolas
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.3 C (0.1 to 0.4) per decade
0.5 F (0.2 to 0.8) per decade
1966 to 2008
40
Rise
Mean daily maximum
0.5 C (0.3 to 0.8) per decade
1.0 F (0.6 to 1.4) per decade
1966 to 2008
40
Rise
Mean daily minimum
-0.03 C (-0.16 to 0.10) per decade
-0.1 F (-0.3 to 0.2) per decade
1966 to 2008
40
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
1964 to 2009
Yearly extremes at San Nicolas: 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)
1991
38.9 C (102.0 F)
45
Coldest night (TNn)
-7.2 C (19.0 F)
1976
-1.1 C (30.0 F)
45
Wettest day (Rx1day)
350.8 mm (13.8 in)
2005
77.5 mm (3.0 in)
46
Wettest five days (Rx5day)
503.5 mm (19.8 in)
2005
130.2 mm (5.1 in)
46
Longest dry spell (CDD)
154 days
1998
57 days
46
Hottest day (TXx)
The hottest day of the year at San Nicolas, 1964 to 2009. The record is 46.7 C (116.1 F) in 1991, marked on the chart; the median year is 38.9 C (102.0 F).
Hottest day (TXx) at San Nicolas by year
Year
Hottest day (TXx)
1964
n/a
1965
40.0 C (104.0 F)
1966
37.8 C (100.0 F)
1967
40.0 C (104.0 F)
1968
35.6 C (96.1 F)
1969
36.7 C (98.1 F)
1970
40.0 C (104.0 F)
1971
40.6 C (105.1 F)
1972
36.7 C (98.1 F)
1973
41.7 C (107.1 F)
1974
38.9 C (102.0 F)
1975
38.9 C (102.0 F)
1976
37.8 C (100.0 F)
1977
36.7 C (98.1 F)
1978
40.0 C (104.0 F)
1979
38.9 C (102.0 F)
1980
37.8 C (100.0 F)
1981
36.7 C (98.1 F)
1982
40.0 C (104.0 F)
1983
40.0 C (104.0 F)
1984
40.0 C (104.0 F)
1985
36.7 C (98.1 F)
1986
38.9 C (102.0 F)
1987
37.8 C (100.0 F)
1988
37.8 C (100.0 F)
1989
40.0 C (104.0 F)
1990
37.8 C (100.0 F)
1991
46.7 C (116.1 F)
1992
35.6 C (96.1 F)
1993
35.6 C (96.1 F)
1994
38.9 C (102.0 F)
1995
42.8 C (109.0 F)
1996
40.0 C (104.0 F)
1997
41.7 C (107.1 F)
1998
40.0 C (104.0 F)
1999
40.0 C (104.0 F)
2000
38.9 C (102.0 F)
2001
38.9 C (102.0 F)
2002
41.7 C (107.1 F)
2003
40.0 C (104.0 F)
2004
40.0 C (104.0 F)
2005
37.8 C (100.0 F)
2006
40.0 C (104.0 F)
2007
35.0 C (95.0 F)
2008
40.0 C (104.0 F)
2009
38.9 C (102.0 F)
Coldest night (TNn)
The coldest night of the year at San Nicolas, 1964 to 2009. The record is -7.2 C (19.0 F) in 1976, marked on the chart; the median year is -1.1 C (30.0 F).
Coldest night (TNn) at San Nicolas by year
Year
Coldest night (TNn)
1964
n/a
1965
0.0 C (32.0 F)
1966
0.0 C (32.0 F)
1967
0.0 C (32.0 F)
1968
0.0 C (32.0 F)
1969
-1.1 C (30.0 F)
1970
-2.2 C (28.0 F)
1971
-3.3 C (26.1 F)
1972
-2.2 C (28.0 F)
1973
-5.0 C (23.0 F)
1974
-1.1 C (30.0 F)
1975
-5.0 C (23.0 F)
1976
-7.2 C (19.0 F)
1977
-2.2 C (28.0 F)
1978
-5.0 C (23.0 F)
1979
-1.1 C (30.0 F)
1980
-1.1 C (30.0 F)
1981
0.6 C (33.1 F)
1982
-4.4 C (24.1 F)
1983
-3.3 C (26.1 F)
1984
-4.4 C (24.1 F)
1985
-5.0 C (23.0 F)
1986
-1.1 C (30.0 F)
1987
0.0 C (32.0 F)
1988
0.0 C (32.0 F)
1989
-4.4 C (24.1 F)
1990
0.0 C (32.0 F)
1991
1.7 C (35.1 F)
1992
0.0 C (32.0 F)
1993
0.0 C (32.0 F)
1994
0.0 C (32.0 F)
1995
0.6 C (33.1 F)
1996
-1.1 C (30.0 F)
1997
-3.3 C (26.1 F)
1998
1.7 C (35.1 F)
1999
0.0 C (32.0 F)
2000
0.6 C (33.1 F)
2001
0.6 C (33.1 F)
2002
0.6 C (33.1 F)
2003
0.0 C (32.0 F)
2004
0.0 C (32.0 F)
2005
-1.1 C (30.0 F)
2006
-2.2 C (28.0 F)
2007
-2.2 C (28.0 F)
2008
-4.4 C (24.1 F)
2009
-2.2 C (28.0 F)
Wettest day (Rx1day)
The wettest day of the year at San Nicolas, 1964 to 2009. The record is 350.8 mm (13.8 in) in 2005, marked on the chart; the median year is 77.5 mm (3.0 in).
Wettest day (Rx1day) at San Nicolas by year
Year
Wettest day (Rx1day)
1964
58.9 mm (2.3 in)
1965
64.3 mm (2.5 in)
1966
99.8 mm (3.9 in)
1967
179.8 mm (7.1 in)
1968
99.8 mm (3.9 in)
1969
59.9 mm (2.4 in)
1970
39.9 mm (1.6 in)
1971
38.4 mm (1.5 in)
1972
74.9 mm (2.9 in)
1973
135.9 mm (5.4 in)
1974
126.0 mm (5.0 in)
1975
97.8 mm (3.9 in)
1976
68.3 mm (2.7 in)
1977
158.8 mm (6.3 in)
1978
152.9 mm (6.0 in)
1979
84.8 mm (3.3 in)
1980
56.4 mm (2.2 in)
1981
106.9 mm (4.2 in)
1982
135.9 mm (5.4 in)
1983
94.0 mm (3.7 in)
1984
111.8 mm (4.4 in)
1985
46.0 mm (1.8 in)
1986
54.9 mm (2.2 in)
1987
181.9 mm (7.2 in)
1988
339.9 mm (13.4 in)
1989
59.9 mm (2.4 in)
1990
41.9 mm (1.6 in)
1991
69.9 mm (2.8 in)
1992
47.8 mm (1.9 in)
1993
90.9 mm (3.6 in)
1994
56.9 mm (2.2 in)
1995
140.0 mm (5.5 in)
1996
105.4 mm (4.1 in)
1997
50.8 mm (2.0 in)
1998
70.9 mm (2.8 in)
1999
46.0 mm (1.8 in)
2000
79.0 mm (3.1 in)
2001
64.8 mm (2.6 in)
2002
20.8 mm (0.8 in)
2003
75.9 mm (3.0 in)
2004
27.9 mm (1.1 in)
2005
350.8 mm (13.8 in)
2006
87.9 mm (3.5 in)
2007
125.0 mm (4.9 in)
2008
89.9 mm (3.5 in)
2009
59.9 mm (2.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at San Nicolas, 1964 to 2009. The record is 503.5 mm (19.8 in) in 2005, marked on the chart; the median year is 130.2 mm (5.1 in).
Wettest five days (Rx5day) at San Nicolas by year
Year
Wettest five days (Rx5day)
1964
78.7 mm (3.1 in)
1965
72.2 mm (2.8 in)
1966
198.1 mm (7.8 in)
1967
437.5 mm (17.2 in)
1968
101.4 mm (4.0 in)
1969
92.0 mm (3.6 in)
1970
116.1 mm (4.6 in)
1971
96.6 mm (3.8 in)
1972
157.5 mm (6.2 in)
1973
218.5 mm (8.6 in)
1974
179.8 mm (7.1 in)
1975
178.1 mm (7.0 in)
1976
183.3 mm (7.2 in)
1977
212.4 mm (8.4 in)
1978
249.0 mm (9.8 in)
1979
157.5 mm (6.2 in)
1980
116.3 mm (4.6 in)
1981
225.5 mm (8.9 in)
1982
138.7 mm (5.5 in)
1983
129.7 mm (5.1 in)
1984
174.7 mm (6.9 in)
1985
85.7 mm (3.4 in)
1986
54.9 mm (2.2 in)
1987
181.9 mm (7.2 in)
1988
339.9 mm (13.4 in)
1989
109.7 mm (4.3 in)
1990
86.3 mm (3.4 in)
1991
130.7 mm (5.1 in)
1992
133.1 mm (5.2 in)
1993
106.7 mm (4.2 in)
1994
100.4 mm (4.0 in)
1995
212.4 mm (8.4 in)
1996
291.1 mm (11.5 in)
1997
109.8 mm (4.3 in)
1998
134.6 mm (5.3 in)
1999
67.8 mm (2.7 in)
2000
79.0 mm (3.1 in)
2001
88.7 mm (3.5 in)
2002
41.1 mm (1.6 in)
2003
128.7 mm (5.1 in)
2004
74.6 mm (2.9 in)
2005
503.5 mm (19.8 in)
2006
112.8 mm (4.4 in)
2007
192.3 mm (7.6 in)
2008
166.3 mm (6.5 in)
2009
127.0 mm (5.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at San Nicolas, 1964 to 2009. The record is 154 days in 1998, marked on the chart; the median year is 57 days.
Longest dry spell (CDD) at San Nicolas by year
Year
Longest dry spell (CDD)
1964
35 days
1965
83 days
1966
68 days
1967
59 days
1968
35 days
1969
32 days
1970
75 days
1971
75 days
1972
29 days
1973
29 days
1974
46 days
1975
37 days
1976
35 days
1977
22 days
1978
29 days
1979
54 days
1980
43 days
1981
23 days
1982
47 days
1983
73 days
1984
77 days
1985
44 days
1986
48 days
1987
50 days
1988
81 days
1989
49 days
1990
79 days
1991
42 days
1992
36 days
1993
50 days
1994
60 days
1995
93 days
1996
63 days
1997
59 days
1998
154 days
1999
120 days
2000
70 days
2001
65 days
2002
149 days
2003
61 days
2004
89 days
2005
60 days
2006
72 days
2007
25 days
2008
34 days
2009
64 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
20 years with a frost
Across 20 years with a frost, the median last spring frost at San Nicolas falls on 27 January and the median first autumn frost on 5 December, which leaves a median of 314 days between them.
Frost dates and growing season at San Nicolas
Measure
Median, all years
Earliest period
Recent period (1966 to 2008)
Recent against earliest
Fitted trend
Last spring frost
27 January
n/a
27 January
n/a
n/a
First autumn frost
5 December
n/a
5 December
n/a
n/a
Growing days
314 days
n/a
314 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, 1965 to 2009
A day with at least 78.5 mm (3.1 in) of rain is expected about once in 2 years. A day with at least 376.0 mm (14.8 in) of rain is expected about once in 100 years.
Rainfall return levels at San Nicolas: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
78.5 mm (3.1 in)
5 years
128.0 mm (5.0 in)
10 years
170.3 mm (6.7 in)
25 years
237.8 mm (9.4 in)
50 years
300.6 mm (11.8 in)
Longer than the 44 years of record
100 years
376.0 mm (14.8 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 1965 to 2009.
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: 350.8 mm (13.8 in) in 2005; 339.9 mm (13.4 in) in 1988; 181.9 mm (7.2 in) in 1987.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of San Nicolas, at 1998. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1998 ran 0.5 C (1.0 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at San Nicolas, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1998
-0.5
-1.0
likely
5
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
Data for San Nicolas standing records by year: CSV or JSON. Field meanings are on the data page.
Data for San Nicolas 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.