Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at San Pedro. 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 Pedro, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
34.4 C (93.9 F)
-10.0 C (14.0 F)
n/a
n/a
Feb
37.8 C (100.0 F)
-9.4 C (15.1 F)
n/a
n/a
Mar
39.4 C (102.9 F)
-4.4 C (24.1 F)
n/a
n/a
Apr
43.9 C (111.0 F)
-2.2 C (28.0 F)
n/a
n/a
May
41.7 C (107.1 F)
5.6 C (42.1 F)
n/a
n/a
Jun
45.0 C (113.0 F)
10.0 C (50.0 F)
n/a
n/a
Jul
43.3 C (109.9 F)
10.0 C (50.0 F)
n/a
n/a
Aug
43.9 C (111.0 F)
10.0 C (50.0 F)
n/a
n/a
Sep
42.8 C (109.0 F)
7.8 C (46.0 F)
n/a
n/a
Oct
40.0 C (104.0 F)
0.0 C (32.0 F)
n/a
n/a
Nov
37.2 C (99.0 F)
-4.4 C (24.1 F)
n/a
n/a
Dec
35.0 C (95.0 F)
-9.4 C (15.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at San Pedro still stand. 1964 holds the most, with 225.
Standing records at San Pedro by the year they were set
Year set
Standing records
1963
15
1964
225
1965
127
1966
33
1967
21
1968
26
1969
32
1970
27
1971
29
1972
23
1973
37
1974
18
1975
29
1976
20
1977
12
1978
27
1979
10
1980
18
1981
9
1982
27
1983
16
1984
21
1985
11
1986
10
1987
17
1988
13
1989
31
1990
23
1991
14
1992
28
1993
20
1994
19
1995
20
1996
18
1997
19
1998
18
1999
12
2000
14
2001
21
2002
29
2003
38
2004
25
2005
27
2006
44
2007
29
2008
46
2009
40
2010
6
2011
44
2012
22
2013
4
All-Time Record Progression
3 new records
3 all-time records were set at San Pedro between 13 September 1995 and 17 June 2000. Each dot is a new record.
When San Pedro set new all-time records
Date
Kind
Detail
1995-09-13
Record daily precipitation
Record daily precipitation 79.8 mm (3.1 in)
1997-12-12
Record low maximum temperature
Record low maximum temperature 0.6 C (33.1 F)
2000-06-17
Record daily precipitation
Record daily precipitation 105.9 mm (4.2 in)
Wettest Day of Each Month
Jun: 105.9 mm (4.2 in)
The wettest day on record for each calendar month at San Pedro. The most was 105.9 mm (4.2 in) on 17 June 2000.
Record daily precipitation for each month at San Pedro
Month
Record daily precipitation (mm)
Date
Jan
24.9 mm (1.0 in)
30 January 1984
Feb
16.8 mm (0.7 in)
25 February 2005
Mar
19.8 mm (0.8 in)
3 March 1968
Apr
26.4 mm (1.0 in)
14 April 1981
May
69.9 mm (2.8 in)
2 May 1981
Jun
105.9 mm (4.2 in)
17 June 2000
Jul
64.8 mm (2.6 in)
21 July 2005
Aug
54.9 mm (2.2 in)
13 August 1990
Sep
79.8 mm (3.1 in)
13 September 1995
Oct
37.8 mm (1.5 in)
11 October 2003
Nov
26.4 mm (1.0 in)
22 November 1972
Dec
24.9 mm (1.0 in)
18 December 1975
Period of Record Coverage
1963 to 2013
Complete yearUnder 90 percent of days
51 years of record at San Pedro, 1963 to 2013. 5 years have data for under 90 percent of days and are left out of rankings: 1963, 1969, 1982, 2007, 2013.
Cooler than the station meanWarmer than the station mean
One stripe for each of 45 complete years at San Pedro, 1965 to 2012. Blue stripes are years cooler than the station's own mean of 21.0 C (69.8 F); red stripes are warmer. The coolest year was 2008, at 19.1 C (66.3 F), and the warmest was 2005, at 22.9 C (73.2 F). The strongest colour marks a difference of 2.0 C (3.6 F).
Annual mean temperature at San Pedro as warming stripes, 1965 to 2012
Year
Annual mean temperature
Difference from the station mean
1965
19.7 C
-1.33 C
1966
20.1 C
-0.89 C
1967
20.6 C
-0.41 C
1968
20.3 C
-0.68 C
1970
20.8 C
-0.18 C
1971
21.4 C
+0.41 C
1972
21.7 C
+0.75 C
1973
20.3 C
-0.71 C
1974
21.3 C
+0.36 C
1975
20.8 C
-0.23 C
1976
19.8 C
-1.21 C
1977
21.2 C
+0.23 C
1978
21.1 C
+0.08 C
1979
20.4 C
-0.56 C
1980
20.8 C
-0.16 C
1981
20.9 C
-0.04 C
1983
20.8 C
-0.14 C
1984
20.7 C
-0.31 C
1985
20.9 C
-0.05 C
1986
20.8 C
-0.22 C
1987
20.0 C
-1.03 C
1988
20.8 C
-0.23 C
1989
21.3 C
+0.29 C
1990
21.4 C
+0.46 C
1991
20.9 C
-0.05 C
1992
20.5 C
-0.53 C
1993
21.0 C
-0.03 C
1994
21.8 C
+0.86 C
1995
21.3 C
+0.31 C
1996
21.1 C
+0.08 C
1997
20.2 C
-0.78 C
1998
21.5 C
+0.54 C
1999
21.3 C
+0.30 C
2000
21.5 C
+0.52 C
2001
21.4 C
+0.45 C
2002
21.4 C
+0.39 C
2003
21.2 C
+0.22 C
2004
21.6 C
+0.61 C
2005
22.9 C
+1.89 C
2006
21.6 C
+0.66 C
2008
19.1 C
-1.91 C
2009
20.7 C
-0.29 C
2010
21.0 C
-0.03 C
2011
22.3 C
+1.36 C
2012
22.1 C
+1.10 C
The annual mean temperature here has risen by 0.2 C (0.1 to 0.4) per decade over 1965 to 2012. In Fahrenheit: 0.4 F (0.1 to 0.6) per decade. The slope is a straight line fitted to 45 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at San Pedro
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.2 C (0.1 to 0.4) per decade
0.4 F (0.1 to 0.6) per decade
1965 to 2012
45
Rise
Mean daily maximum
-0.1 C (-0.4 to 0.1) per decade
-0.2 F (-0.6 to 0.3) per decade
1965 to 2012
45
Not clearly different from zero
Mean daily minimum
0.5 C (0.4 to 0.7) per decade
1.0 F (0.7 to 1.2) per decade
1965 to 2012
45
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
1963 to 2013
Yearly extremes at San Pedro: 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)
1964
40.0 C (104.0 F)
51
Coldest night (TNn)
-10.0 C (14.0 F)
1964
-3.3 C (26.1 F)
51
Wettest day (Rx1day)
105.9 mm (4.2 in)
2000
30.0 mm (1.2 in)
51
Wettest five days (Rx5day)
123.4 mm (4.9 in)
2012
46.5 mm (1.8 in)
51
Longest dry spell (CDD)
365 days
1971
99 days
51
Hottest day (TXx)
The hottest day of the year at San Pedro, 1963 to 2013. The record is 45.0 C (113.0 F) in 1964, marked on the chart; the median year is 40.0 C (104.0 F).
Hottest day (TXx) at San Pedro by year
Year
Hottest day (TXx)
1963
40.6 C (105.1 F)
1964
45.0 C (113.0 F)
1965
40.0 C (104.0 F)
1966
40.0 C (104.0 F)
1967
40.0 C (104.0 F)
1968
38.9 C (102.0 F)
1969
40.0 C (104.0 F)
1970
40.6 C (105.1 F)
1971
40.0 C (104.0 F)
1972
40.0 C (104.0 F)
1973
38.9 C (102.0 F)
1974
40.6 C (105.1 F)
1975
41.7 C (107.1 F)
1976
40.0 C (104.0 F)
1977
40.0 C (104.0 F)
1978
40.0 C (104.0 F)
1979
38.9 C (102.0 F)
1980
41.7 C (107.1 F)
1981
40.0 C (104.0 F)
1982
40.0 C (104.0 F)
1983
41.7 C (107.1 F)
1984
40.0 C (104.0 F)
1985
40.6 C (105.1 F)
1986
38.9 C (102.0 F)
1987
40.0 C (104.0 F)
1988
39.4 C (102.9 F)
1989
41.7 C (107.1 F)
1990
40.0 C (104.0 F)
1991
40.0 C (104.0 F)
1992
40.0 C (104.0 F)
1993
40.6 C (105.1 F)
1994
40.0 C (104.0 F)
1995
40.0 C (104.0 F)
1996
41.1 C (106.0 F)
1997
38.9 C (102.0 F)
1998
41.1 C (106.0 F)
1999
40.0 C (104.0 F)
2000
38.9 C (102.0 F)
2001
40.0 C (104.0 F)
2002
40.0 C (104.0 F)
2003
41.7 C (107.1 F)
2004
41.1 C (106.0 F)
2005
42.2 C (108.0 F)
2006
42.8 C (109.0 F)
2007
40.6 C (105.1 F)
2008
35.6 C (96.1 F)
2009
40.0 C (104.0 F)
2010
40.0 C (104.0 F)
2011
41.7 C (107.1 F)
2012
40.0 C (104.0 F)
2013
30.0 C (86.0 F)
Coldest night (TNn)
The coldest night of the year at San Pedro, 1963 to 2013. The record is -10.0 C (14.0 F) in 1964, marked on the chart; the median year is -3.3 C (26.1 F).
Coldest night (TNn) at San Pedro by year
Year
Coldest night (TNn)
1963
-9.4 C (15.1 F)
1964
-10.0 C (14.0 F)
1965
-5.0 C (23.0 F)
1966
-6.1 C (21.0 F)
1967
-5.0 C (23.0 F)
1968
-5.0 C (23.0 F)
1969
-3.3 C (26.1 F)
1970
-4.4 C (24.1 F)
1971
-5.0 C (23.0 F)
1972
-1.7 C (28.9 F)
1973
-6.1 C (21.0 F)
1974
-5.0 C (23.0 F)
1975
-7.2 C (19.0 F)
1976
-5.0 C (23.0 F)
1977
-2.2 C (28.0 F)
1978
-4.4 C (24.1 F)
1979
-4.4 C (24.1 F)
1980
-3.3 C (26.1 F)
1981
-2.2 C (28.0 F)
1982
-1.1 C (30.0 F)
1983
-6.1 C (21.0 F)
1984
-2.2 C (28.0 F)
1985
-4.4 C (24.1 F)
1986
-3.3 C (26.1 F)
1987
-3.3 C (26.1 F)
1988
-6.1 C (21.0 F)
1989
-2.8 C (27.0 F)
1990
-2.2 C (28.0 F)
1991
0.0 C (32.0 F)
1992
-3.3 C (26.1 F)
1993
0.0 C (32.0 F)
1994
-4.4 C (24.1 F)
1995
0.0 C (32.0 F)
1996
-5.0 C (23.0 F)
1997
-8.3 C (17.1 F)
1998
-3.3 C (26.1 F)
1999
-3.3 C (26.1 F)
2000
-3.3 C (26.1 F)
2001
-3.3 C (26.1 F)
2002
-3.3 C (26.1 F)
2003
-3.3 C (26.1 F)
2004
-5.0 C (23.0 F)
2005
0.0 C (32.0 F)
2006
0.0 C (32.0 F)
2007
0.0 C (32.0 F)
2008
0.0 C (32.0 F)
2009
-0.6 C (30.9 F)
2010
-4.4 C (24.1 F)
2011
-9.4 C (15.1 F)
2012
0.0 C (32.0 F)
2013
-8.3 C (17.1 F)
Wettest day (Rx1day)
The wettest day of the year at San Pedro, 1963 to 2013. The record is 105.9 mm (4.2 in) in 2000, marked on the chart; the median year is 30.0 mm (1.2 in).
Wettest day (Rx1day) at San Pedro by year
Year
Wettest day (Rx1day)
1963
10.9 mm (0.4 in)
1964
42.9 mm (1.7 in)
1965
39.4 mm (1.6 in)
1966
63.8 mm (2.5 in)
1967
25.9 mm (1.0 in)
1968
41.9 mm (1.6 in)
1969
26.4 mm (1.0 in)
1970
21.8 mm (0.9 in)
1971
0.0 mm (0.00 in)
1972
56.9 mm (2.2 in)
1973
31.5 mm (1.2 in)
1974
22.9 mm (0.9 in)
1975
46.5 mm (1.8 in)
1976
20.8 mm (0.8 in)
1977
23.4 mm (0.9 in)
1978
52.3 mm (2.1 in)
1979
46.0 mm (1.8 in)
1980
27.4 mm (1.1 in)
1981
69.9 mm (2.8 in)
1982
49.8 mm (2.0 in)
1983
21.8 mm (0.9 in)
1984
26.9 mm (1.1 in)
1985
26.9 mm (1.1 in)
1986
58.9 mm (2.3 in)
1987
33.3 mm (1.3 in)
1988
25.4 mm (1.0 in)
1989
19.8 mm (0.8 in)
1990
54.9 mm (2.2 in)
1991
30.0 mm (1.2 in)
1992
67.8 mm (2.7 in)
1993
38.9 mm (1.5 in)
1994
14.0 mm (0.6 in)
1995
79.8 mm (3.1 in)
1996
24.9 mm (1.0 in)
1997
30.0 mm (1.2 in)
1998
20.8 mm (0.8 in)
1999
38.9 mm (1.5 in)
2000
105.9 mm (4.2 in)
2001
21.8 mm (0.9 in)
2002
59.9 mm (2.4 in)
2003
37.8 mm (1.5 in)
2004
39.9 mm (1.6 in)
2005
64.8 mm (2.6 in)
2006
33.3 mm (1.3 in)
2007
19.3 mm (0.8 in)
2008
10.4 mm (0.4 in)
2009
3.8 mm (0.15 in)
2010
10.9 mm (0.4 in)
2011
4.3 mm (0.17 in)
2012
57.9 mm (2.3 in)
2013
0.0 mm (0.00 in)
Wettest five days (Rx5day)
The wettest five days of the year at San Pedro, 1963 to 2013. The record is 123.4 mm (4.9 in) in 2012, marked on the chart; the median year is 46.5 mm (1.8 in).
Wettest five days (Rx5day) at San Pedro by year
Year
Wettest five days (Rx5day)
1963
16.5 mm (0.6 in)
1964
45.7 mm (1.8 in)
1965
47.0 mm (1.9 in)
1966
81.8 mm (3.2 in)
1967
27.7 mm (1.1 in)
1968
68.8 mm (2.7 in)
1969
43.2 mm (1.7 in)
1970
45.5 mm (1.8 in)
1971
0.0 mm (0.00 in)
1972
68.1 mm (2.7 in)
1973
74.7 mm (2.9 in)
1974
30.8 mm (1.2 in)
1975
46.5 mm (1.8 in)
1976
50.5 mm (2.0 in)
1977
43.0 mm (1.7 in)
1978
68.8 mm (2.7 in)
1979
93.5 mm (3.7 in)
1980
31.3 mm (1.2 in)
1981
78.8 mm (3.1 in)
1982
59.7 mm (2.4 in)
1983
39.6 mm (1.6 in)
1984
35.1 mm (1.4 in)
1985
36.8 mm (1.4 in)
1986
85.6 mm (3.4 in)
1987
62.0 mm (2.4 in)
1988
50.6 mm (2.0 in)
1989
27.1 mm (1.1 in)
1990
110.8 mm (4.4 in)
1991
58.4 mm (2.3 in)
1992
67.8 mm (2.7 in)
1993
44.5 mm (1.8 in)
1994
16.8 mm (0.7 in)
1995
89.7 mm (3.5 in)
1996
43.7 mm (1.7 in)
1997
45.8 mm (1.8 in)
1998
27.2 mm (1.1 in)
1999
59.7 mm (2.4 in)
2000
105.9 mm (4.2 in)
2001
21.8 mm (0.9 in)
2002
89.4 mm (3.5 in)
2003
51.6 mm (2.0 in)
2004
81.5 mm (3.2 in)
2005
84.6 mm (3.3 in)
2006
56.2 mm (2.2 in)
2007
25.4 mm (1.0 in)
2008
10.4 mm (0.4 in)
2009
6.4 mm (0.25 in)
2010
10.9 mm (0.4 in)
2011
4.3 mm (0.17 in)
2012
123.4 mm (4.9 in)
2013
0.0 mm (0.00 in)
Longest dry spell (CDD)
The longest dry spell of the year at San Pedro, 1963 to 2013. The record is 365 days in 1971, marked on the chart; the median year is 99 days.
Longest dry spell (CDD) at San Pedro by year
Year
Longest dry spell (CDD)
1963
37 days
1964
89 days
1965
76 days
1966
120 days
1967
68 days
1968
47 days
1969
89 days
1970
95 days
1971
365 days
1972
148 days
1973
70 days
1974
114 days
1975
145 days
1976
94 days
1977
79 days
1978
140 days
1979
110 days
1980
118 days
1981
48 days
1982
112 days
1983
70 days
1984
104 days
1985
59 days
1986
64 days
1987
53 days
1988
76 days
1989
99 days
1990
82 days
1991
119 days
1992
99 days
1993
139 days
1994
78 days
1995
144 days
1996
148 days
1997
48 days
1998
160 days
1999
144 days
2000
140 days
2001
170 days
2002
125 days
2003
115 days
2004
46 days
2005
79 days
2006
89 days
2007
82 days
2008
248 days
2009
329 days
2010
127 days
2011
243 days
2012
85 days
2013
31 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
36 years with a frost
Across 36 years with a frost, the median last spring frost at San Pedro falls on 7 February and the median first autumn frost on 3 December, which leaves a median of 305 days between them.
Fitted over all years, the growing season changes by +9.7 days per decade at this station.
Frost dates and growing season at San Pedro
Measure
Median, all years
Earliest period
Recent period (1973 to 2012)
Recent against earliest
Fitted trend
Last spring frost
7 February
n/a
3 February
n/a
-7.9 days per decade
First autumn frost
3 December
n/a
3 December
n/a
+1.7 days per decade
Growing days
305 days
n/a
309 days
n/a
+9.7 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
47 years, 1964 to 2012
A day with at least 34.1 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 101.8 mm (4.0 in) of rain is expected about once in 100 years.
Rainfall return levels at San Pedro: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
34.1 mm (1.3 in)
5 years
53.6 mm (2.1 in)
10 years
65.9 mm (2.6 in)
25 years
80.9 mm (3.2 in)
50 years
91.5 mm (3.6 in)
Longer than the 47 years of record
100 years
101.8 mm (4.0 in)
Longer than the 47 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, 47 years of values from 1964 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: 105.9 mm (4.2 in) in 2000; 79.8 mm (3.1 in) in 1995; 69.9 mm (2.8 in) in 1981.
Download the Data
Data for San Pedro standing records by year: CSV or JSON. Field meanings are on the data page.
Data for San Pedro 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.