Record envelope, standing records and threshold days for San Gregorio 2 SE (USC00047807), California, United States, with 54 years of record.
Key Facts for San Gregorio 2 SE
San Gregorio 2 SE (USC00047807) is a weather station in California, United States at 37.31 latitude and -122.36 longitude, 84 m (275 ft) above sea level.
The station reports from 1954 to 2007, 54 years of record.
1,464 records set at San Gregorio 2 SE still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
San Gregorio 2 SE set a daily record low minimum temperature of -2.2 C (28.0 F) on 23 November 2007.
About the Station
Location: California, United States, 37.31 latitude, -122.36 longitude.
Elevation: 84 m (275 ft).
Period of record: 1954 to 2007, 54 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
0 days at or beyond a record
Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at San Gregorio 2 SE. 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 Gregorio 2 SE, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
27.2 C (81.0 F)
-5.0 C (23.0 F)
n/a
n/a
Feb
27.8 C (82.0 F)
-3.9 C (25.0 F)
n/a
n/a
Mar
29.4 C (84.9 F)
-2.8 C (27.0 F)
n/a
n/a
Apr
32.8 C (91.0 F)
-1.7 C (28.9 F)
n/a
n/a
May
32.8 C (91.0 F)
-2.2 C (28.0 F)
n/a
n/a
Jun
36.1 C (97.0 F)
0.0 C (32.0 F)
n/a
n/a
Jul
34.4 C (93.9 F)
2.8 C (37.0 F)
n/a
n/a
Aug
34.4 C (93.9 F)
3.3 C (37.9 F)
n/a
n/a
Sep
36.7 C (98.1 F)
1.7 C (35.1 F)
n/a
n/a
Oct
37.2 C (99.0 F)
-1.7 C (28.9 F)
n/a
n/a
Nov
31.7 C (89.1 F)
-2.8 C (27.0 F)
n/a
n/a
Dec
31.1 C (88.0 F)
-6.7 C (19.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at San Gregorio 2 SE still stand. 1955 holds the most, with 80.
Standing records at San Gregorio 2 SE by the year they were set
Year set
Standing records
1954
23
1955
80
1956
37
1957
35
1958
39
1959
27
1960
31
1961
40
1962
53
1963
25
1964
35
1965
28
1966
26
1967
25
1968
27
1969
25
1970
34
1971
39
1972
32
1973
20
1974
22
1975
31
1976
22
1977
16
1978
23
1979
27
1980
18
1981
30
1982
24
1983
27
1984
20
1985
33
1986
16
1987
26
1988
24
1989
36
1990
31
1991
12
1992
35
1993
30
1994
9
1995
14
1996
35
1997
25
1998
18
1999
13
2000
13
2001
30
2002
21
2003
23
2004
24
2005
15
2006
15
2007
25
All-Time Record Progression
2 new records
2 all-time records were set at San Gregorio 2 SE between 22 December 1990 and 21 December 1998. Each dot is a new record.
When San Gregorio 2 SE set new all-time records
Date
Kind
Detail
1990-12-22
Record low minimum temperature
Record low minimum temperature -5.6 C (21.9 F)
1998-12-21
Record low minimum temperature
Record low minimum temperature -6.7 C (19.9 F)
Wettest Day of Each Month
Oct: 161.8 mm (6.4 in)
The wettest day on record for each calendar month at San Gregorio 2 SE. The most was 161.8 mm (6.4 in) on 13 October 1962.
Record daily precipitation for each month at San Gregorio 2 SE
Month
Record daily precipitation (mm)
Date
Jan
158.2 mm (6.2 in)
4 January 1982
Feb
111.3 mm (4.4 in)
12 February 1992
Mar
64.5 mm (2.5 in)
2 March 1983
Apr
58.4 mm (2.3 in)
2 April 1958
May
83.6 mm (3.3 in)
18 May 1957
Jun
19.3 mm (0.8 in)
2 June 1967
Jul
20.6 mm (0.8 in)
8 July 1974
Aug
13.5 mm (0.5 in)
15 August 1976
Sep
26.7 mm (1.1 in)
27 September 1957
Oct
161.8 mm (6.4 in)
13 October 1962
Nov
64.5 mm (2.5 in)
13 November 1981
Dec
106.9 mm (4.2 in)
12 December 1995
Period of Record Coverage
1954 to 2007
Complete yearUnder 90 percent of days
54 years of record at San Gregorio 2 SE, 1954 to 2007. 4 years have data for under 90 percent of days and are left out of rankings: 1954, 1999, 2000, 2007.
Cooler than the station meanWarmer than the station mean
One stripe for each of 49 complete years at San Gregorio 2 SE, 1955 to 2006. Blue stripes are years cooler than the station's own mean of 12.5 C (54.6 F); red stripes are warmer. The coolest year was 1955, at 11.1 C (52.1 F), and the warmest was 1983, at 13.7 C (56.7 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at San Gregorio 2 SE as warming stripes, 1955 to 2006
Year
Annual mean temperature
Difference from the station mean
1955
11.1 C
-1.40 C
1956
11.9 C
-0.65 C
1957
12.6 C
+0.07 C
1958
13.6 C
+1.04 C
1959
13.0 C
+0.46 C
1960
12.3 C
-0.24 C
1961
12.7 C
+0.11 C
1962
12.1 C
-0.48 C
1964
12.0 C
-0.51 C
1965
12.4 C
-0.11 C
1966
12.5 C
-0.01 C
1967
12.5 C
-0.08 C
1968
12.7 C
+0.14 C
1969
12.4 C
-0.17 C
1970
12.5 C
-0.05 C
1971
11.5 C
-1.07 C
1972
12.4 C
-0.16 C
1973
12.2 C
-0.32 C
1974
12.1 C
-0.43 C
1975
11.7 C
-0.88 C
1976
12.5 C
-0.01 C
1977
12.4 C
-0.10 C
1978
12.7 C
+0.17 C
1979
12.8 C
+0.29 C
1980
12.9 C
+0.36 C
1981
12.8 C
+0.27 C
1982
12.3 C
-0.26 C
1983
13.7 C
+1.17 C
1984
12.6 C
+0.02 C
1985
12.4 C
-0.16 C
1986
13.1 C
+0.55 C
1987
12.9 C
+0.39 C
1988
12.7 C
+0.16 C
1989
12.6 C
+0.07 C
1990
12.5 C
-0.03 C
1991
12.3 C
-0.25 C
1992
13.6 C
+1.06 C
1993
13.0 C
+0.45 C
1994
12.0 C
-0.54 C
1995
13.1 C
+0.58 C
1996
12.7 C
+0.14 C
1997
13.1 C
+0.54 C
1998
12.0 C
-0.58 C
2001
12.0 C
-0.53 C
2002
12.3 C
-0.25 C
2003
13.0 C
+0.42 C
2004
13.0 C
+0.43 C
2005
12.9 C
+0.36 C
2006
12.8 C
+0.26 C
The annual mean temperature here has risen by 0.10 C (0.00 to 0.20) per decade over 1955 to 2006. In Fahrenheit: 0.18 F (0.01 to 0.35) per decade. The slope is a straight line fitted to 49 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at San Gregorio 2 SE
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.10 C (0.00 to 0.20) per decade
0.18 F (0.01 to 0.35) per decade
1955 to 2006
49
Rise
Mean daily maximum
0.07 C (-0.05 to 0.18) per decade
0.1 F (-0.1 to 0.3) per decade
1955 to 2006
49
Not clearly different from zero
Mean daily minimum
0.14 C (0.03 to 0.24) per decade
0.24 F (0.05 to 0.44) per decade
1955 to 2006
49
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
1954 to 2007
Yearly extremes at San Gregorio 2 SE: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
37.2 C (99.0 F)
1961
33.3 C (91.9 F)
54
Coldest night (TNn)
-6.7 C (19.9 F)
1998
-2.2 C (28.0 F)
54
Wettest day (Rx1day)
161.8 mm (6.4 in)
1962
59.1 mm (2.3 in)
54
Wettest five days (Rx5day)
273.6 mm (10.8 in)
1955
114.7 mm (4.5 in)
54
Longest dry spell (CDD)
136 days
1995
58 days
54
Hottest day (TXx)
The hottest day of the year at San Gregorio 2 SE, 1954 to 2007. The record is 37.2 C (99.0 F) in 1961, marked on the chart; the median year is 33.3 C (91.9 F).
Hottest day (TXx) at San Gregorio 2 SE by year
Year
Hottest day (TXx)
1954
32.8 C (91.0 F)
1955
30.6 C (87.1 F)
1956
32.8 C (91.0 F)
1957
31.7 C (89.1 F)
1958
33.9 C (93.0 F)
1959
34.4 C (93.9 F)
1960
33.9 C (93.0 F)
1961
37.2 C (99.0 F)
1962
32.2 C (90.0 F)
1963
31.7 C (89.1 F)
1964
35.0 C (95.0 F)
1965
34.4 C (93.9 F)
1966
33.9 C (93.0 F)
1967
32.8 C (91.0 F)
1968
34.4 C (93.9 F)
1969
27.2 C (81.0 F)
1970
34.4 C (93.9 F)
1971
35.0 C (95.0 F)
1972
33.3 C (91.9 F)
1973
33.3 C (91.9 F)
1974
32.2 C (90.0 F)
1975
32.2 C (90.0 F)
1976
36.1 C (97.0 F)
1977
32.8 C (91.0 F)
1978
35.6 C (96.1 F)
1979
36.7 C (98.1 F)
1980
35.0 C (95.0 F)
1981
30.6 C (87.1 F)
1982
29.4 C (84.9 F)
1983
34.4 C (93.9 F)
1984
35.0 C (95.0 F)
1985
34.4 C (93.9 F)
1986
29.4 C (84.9 F)
1987
37.2 C (99.0 F)
1988
33.3 C (91.9 F)
1989
33.3 C (91.9 F)
1990
30.0 C (86.0 F)
1991
33.3 C (91.9 F)
1992
32.2 C (90.0 F)
1993
34.4 C (93.9 F)
1994
31.1 C (88.0 F)
1995
32.2 C (90.0 F)
1996
35.6 C (96.1 F)
1997
32.8 C (91.0 F)
1998
28.3 C (82.9 F)
1999
28.9 C (84.0 F)
2000
34.4 C (93.9 F)
2001
33.3 C (91.9 F)
2002
32.2 C (90.0 F)
2003
33.3 C (91.9 F)
2004
33.3 C (91.9 F)
2005
29.4 C (84.9 F)
2006
32.8 C (91.0 F)
2007
31.7 C (89.1 F)
Coldest night (TNn)
The coldest night of the year at San Gregorio 2 SE, 1954 to 2007. The record is -6.7 C (19.9 F) in 1998, marked on the chart; the median year is -2.2 C (28.0 F).
Coldest night (TNn) at San Gregorio 2 SE by year
Year
Coldest night (TNn)
1954
-2.2 C (28.0 F)
1955
-2.8 C (27.0 F)
1956
-2.2 C (28.0 F)
1957
-2.2 C (28.0 F)
1958
-2.8 C (27.0 F)
1959
-1.7 C (28.9 F)
1960
-3.3 C (26.1 F)
1961
-2.8 C (27.0 F)
1962
-2.8 C (27.0 F)
1963
-5.0 C (23.0 F)
1964
-2.8 C (27.0 F)
1965
-2.8 C (27.0 F)
1966
-2.2 C (28.0 F)
1967
-2.2 C (28.0 F)
1968
-3.3 C (26.1 F)
1969
-0.6 C (30.9 F)
1970
-0.6 C (30.9 F)
1971
-2.2 C (28.0 F)
1972
-4.4 C (24.1 F)
1973
-2.2 C (28.0 F)
1974
-2.2 C (28.0 F)
1975
-3.3 C (26.1 F)
1976
-3.3 C (26.1 F)
1977
-1.7 C (28.9 F)
1978
-3.9 C (25.0 F)
1979
-3.3 C (26.1 F)
1980
-1.7 C (28.9 F)
1981
0.6 C (33.1 F)
1982
-1.1 C (30.0 F)
1983
-0.6 C (30.9 F)
1984
-0.6 C (30.9 F)
1985
-2.8 C (27.0 F)
1986
-1.7 C (28.9 F)
1987
-2.2 C (28.0 F)
1988
-1.7 C (28.9 F)
1989
-1.7 C (28.9 F)
1990
-5.6 C (21.9 F)
1991
-2.2 C (28.0 F)
1992
-1.1 C (30.0 F)
1993
-2.8 C (27.0 F)
1994
-1.7 C (28.9 F)
1995
0.0 C (32.0 F)
1996
-1.7 C (28.9 F)
1997
-3.9 C (25.0 F)
1998
-6.7 C (19.9 F)
1999
-3.9 C (25.0 F)
2000
-2.2 C (28.0 F)
2001
-3.3 C (26.1 F)
2002
-3.3 C (26.1 F)
2003
-2.2 C (28.0 F)
2004
-2.8 C (27.0 F)
2005
-1.7 C (28.9 F)
2006
-2.2 C (28.0 F)
2007
-4.4 C (24.1 F)
Wettest day (Rx1day)
The wettest day of the year at San Gregorio 2 SE, 1954 to 2007. The record is 161.8 mm (6.4 in) in 1962, marked on the chart; the median year is 59.1 mm (2.3 in).
Wettest day (Rx1day) at San Gregorio 2 SE by year
Year
Wettest day (Rx1day)
1954
56.4 mm (2.2 in)
1955
104.1 mm (4.1 in)
1956
59.2 mm (2.3 in)
1957
83.6 mm (3.3 in)
1958
73.2 mm (2.9 in)
1959
53.8 mm (2.1 in)
1960
45.0 mm (1.8 in)
1961
37.1 mm (1.5 in)
1962
161.8 mm (6.4 in)
1963
88.4 mm (3.5 in)
1964
63.2 mm (2.5 in)
1965
49.5 mm (1.9 in)
1966
62.5 mm (2.5 in)
1967
147.3 mm (5.8 in)
1968
72.1 mm (2.8 in)
1969
74.4 mm (2.9 in)
1970
52.3 mm (2.1 in)
1971
40.9 mm (1.6 in)
1972
47.0 mm (1.9 in)
1973
61.0 mm (2.4 in)
1974
55.9 mm (2.2 in)
1975
38.1 mm (1.5 in)
1976
45.7 mm (1.8 in)
1977
53.6 mm (2.1 in)
1978
52.6 mm (2.1 in)
1979
89.4 mm (3.5 in)
1980
52.1 mm (2.1 in)
1981
64.5 mm (2.5 in)
1982
158.2 mm (6.2 in)
1983
64.5 mm (2.5 in)
1984
46.7 mm (1.8 in)
1985
42.9 mm (1.7 in)
1986
62.0 mm (2.4 in)
1987
47.0 mm (1.9 in)
1988
37.8 mm (1.5 in)
1989
38.9 mm (1.5 in)
1990
40.6 mm (1.6 in)
1991
51.8 mm (2.0 in)
1992
111.3 mm (4.4 in)
1993
45.2 mm (1.8 in)
1994
59.7 mm (2.4 in)
1995
106.9 mm (4.2 in)
1996
63.8 mm (2.5 in)
1997
58.9 mm (2.3 in)
1998
97.8 mm (3.9 in)
1999
45.7 mm (1.8 in)
2000
94.7 mm (3.7 in)
2001
55.1 mm (2.2 in)
2002
67.6 mm (2.7 in)
2003
63.5 mm (2.5 in)
2004
59.9 mm (2.4 in)
2005
85.1 mm (3.4 in)
2006
47.8 mm (1.9 in)
2007
41.7 mm (1.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at San Gregorio 2 SE, 1954 to 2007. The record is 273.6 mm (10.8 in) in 1955, marked on the chart; the median year is 114.7 mm (4.5 in).
Wettest five days (Rx5day) at San Gregorio 2 SE by year
Year
Wettest five days (Rx5day)
1954
97.0 mm (3.8 in)
1955
273.6 mm (10.8 in)
1956
114.6 mm (4.5 in)
1957
98.3 mm (3.9 in)
1958
155.7 mm (6.1 in)
1959
134.1 mm (5.3 in)
1960
75.2 mm (3.0 in)
1961
81.3 mm (3.2 in)
1962
211.8 mm (8.3 in)
1963
179.6 mm (7.1 in)
1964
114.8 mm (4.5 in)
1965
99.6 mm (3.9 in)
1966
97.0 mm (3.8 in)
1967
238.4 mm (9.4 in)
1968
88.4 mm (3.5 in)
1969
120.9 mm (4.8 in)
1970
136.4 mm (5.4 in)
1971
99.3 mm (3.9 in)
1972
152.6 mm (6.0 in)
1973
120.7 mm (4.8 in)
1974
88.7 mm (3.5 in)
1975
64.0 mm (2.5 in)
1976
50.5 mm (2.0 in)
1977
81.8 mm (3.2 in)
1978
124.3 mm (4.9 in)
1979
132.1 mm (5.2 in)
1980
124.4 mm (4.9 in)
1981
103.8 mm (4.1 in)
1982
242.0 mm (9.5 in)
1983
154.0 mm (6.1 in)
1984
91.2 mm (3.6 in)
1985
72.6 mm (2.9 in)
1986
186.0 mm (7.3 in)
1987
96.6 mm (3.8 in)
1988
85.1 mm (3.4 in)
1989
49.2 mm (1.9 in)
1990
67.7 mm (2.7 in)
1991
95.3 mm (3.8 in)
1992
222.1 mm (8.7 in)
1993
91.2 mm (3.6 in)
1994
122.7 mm (4.8 in)
1995
202.1 mm (8.0 in)
1996
95.5 mm (3.8 in)
1997
132.0 mm (5.2 in)
1998
180.9 mm (7.1 in)
1999
109.2 mm (4.3 in)
2000
165.9 mm (6.5 in)
2001
138.4 mm (5.4 in)
2002
190.6 mm (7.5 in)
2003
77.0 mm (3.0 in)
2004
137.2 mm (5.4 in)
2005
139.7 mm (5.5 in)
2006
105.9 mm (4.2 in)
2007
100.9 mm (4.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at San Gregorio 2 SE, 1954 to 2007. The record is 136 days in 1995, marked on the chart; the median year is 58 days.
Longest dry spell (CDD) at San Gregorio 2 SE by year
Year
Longest dry spell (CDD)
1954
61 days
1955
67 days
1956
37 days
1957
109 days
1958
51 days
1959
63 days
1960
128 days
1961
106 days
1962
27 days
1963
98 days
1964
57 days
1965
54 days
1966
80 days
1967
110 days
1968
49 days
1969
42 days
1970
74 days
1971
42 days
1972
67 days
1973
97 days
1974
49 days
1975
48 days
1976
38 days
1977
52 days
1978
64 days
1979
49 days
1980
31 days
1981
47 days
1982
75 days
1983
39 days
1984
76 days
1985
45 days
1986
92 days
1987
69 days
1988
59 days
1989
53 days
1990
68 days
1991
53 days
1992
62 days
1993
69 days
1994
62 days
1995
136 days
1996
76 days
1997
66 days
1998
52 days
1999
31 days
2000
32 days
2001
50 days
2002
58 days
2003
88 days
2004
53 days
2005
36 days
2006
57 days
2007
47 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
43 years with a frost
Across 43 years with a frost, the median last spring frost at San Gregorio 2 SE falls on 13 March and the median first autumn frost on 19 November, which leaves a median of 250 days between them.
Fitted over all years, the growing season changes by +0.3 days per decade at this station.
Frost dates and growing season at San Gregorio 2 SE
Measure
Median, all years
Earliest period
Recent period (1971 to 2006)
Recent against earliest
Fitted trend
Last spring frost
13 March
n/a
12 March
n/a
-0.9 days per decade
First autumn frost
19 November
n/a
20 November
n/a
-0.7 days per decade
Growing days
250 days
n/a
246 days
n/a
+0.3 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
51 years, 1955 to 2007
A day with at least 57.7 mm (2.3 in) of rain is expected about once in 2 years. A day with at least 194.1 mm (7.6 in) of rain is expected about once in 100 years.
Rainfall return levels at San Gregorio 2 SE: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
57.7 mm (2.3 in)
5 years
79.6 mm (3.1 in)
10 years
98.7 mm (3.9 in)
25 years
129.6 mm (5.1 in)
50 years
158.7 mm (6.2 in)
100 years
194.1 mm (7.6 in)
Longer than the 51 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, 51 years of values from 1955 to 2007.
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: 161.8 mm (6.4 in) in 1962; 158.2 mm (6.2 in) in 1982; 147.3 mm (5.8 in) in 1967.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for San Gregorio 2 SE standing records by year: CSV or JSON. Field meanings are on the data page.
Data for San Gregorio 2 SE 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.