Record envelope, standing records and threshold days for Gilroy (USC00043417), California, United States, with 118 years of record.
Key Facts for Gilroy
Gilroy (USC00043417) is a weather station in California, United States at 37.00 latitude and -121.56 longitude, 59 m (194 ft) above sea level.
The station reports from 1906 to 2023, 118 years of record.
1,464 records set at Gilroy still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Gilroy set a daily record precipitation of 47.5 mm (1.9 in) on 17 February 2026.
About the Station
Location: California, United States, 37.00 latitude, -121.56 longitude.
Elevation: 59 m (194 ft).
Period of record: 1906 to 2023, 118 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 Gilroy. 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 Gilroy, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
26.7 C (80.1 F)
-7.8 C (18.0 F)
n/a
n/a
Feb
30.0 C (86.0 F)
-5.0 C (23.0 F)
n/a
n/a
Mar
32.2 C (90.0 F)
-5.0 C (23.0 F)
n/a
n/a
Apr
37.8 C (100.0 F)
-2.8 C (27.0 F)
n/a
n/a
May
41.1 C (106.0 F)
-0.6 C (30.9 F)
n/a
n/a
Jun
44.4 C (111.9 F)
2.2 C (36.0 F)
n/a
n/a
Jul
46.1 C (115.0 F)
5.0 C (41.0 F)
n/a
n/a
Aug
44.4 C (111.9 F)
2.8 C (37.0 F)
n/a
n/a
Sep
45.0 C (113.0 F)
-1.1 C (30.0 F)
n/a
n/a
Oct
41.7 C (107.1 F)
-1.7 C (28.9 F)
n/a
n/a
Nov
34.4 C (93.9 F)
-5.0 C (23.0 F)
n/a
n/a
Dec
26.7 C (80.1 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 Gilroy still stand. 1964 holds the most, with 56.
Standing records at Gilroy by the year they were set
Year set
Standing records
1907
5
1957
27
1958
22
1959
27
1960
22
1961
49
1962
40
1963
35
1964
56
1965
28
1966
24
1967
22
1968
25
1969
16
1970
29
1971
28
1972
40
1973
25
1974
22
1975
17
1976
35
1977
22
1978
25
1979
16
1980
21
1981
21
1982
21
1983
15
1984
11
1985
23
1986
13
1987
28
1988
20
1989
32
1990
33
1991
18
1992
16
1993
17
1994
9
1995
21
1996
43
1997
24
1998
21
1999
20
2000
15
2001
19
2002
17
2003
13
2004
17
2005
8
2006
18
2007
10
2008
15
2009
26
2010
17
2011
13
2012
19
2013
14
2014
21
2015
22
2016
15
2017
24
2018
12
2019
9
2020
14
2021
12
2022
25
2023
5
All-Time Record Progression
4 new records
4 all-time records were set at Gilroy between 13 July 1990 and 3 September 2017. Each dot is a new record.
When Gilroy set new all-time records
Date
Kind
Detail
1990-07-13
Record high minimum temperature
Record high minimum temperature 21.1 C (70.0 F)
1990-12-22
Record low minimum temperature
Record low minimum temperature -8.3 C (17.1 F)
2009-10-14
Record daily precipitation
Record daily precipitation 151.1 mm (5.9 in)
2017-09-03
Record high minimum temperature
Record high minimum temperature 22.2 C (72.0 F)
Wettest Day of Each Month
Oct: 151.1 mm (5.9 in)
The wettest day on record for each calendar month at Gilroy. The most was 151.1 mm (5.9 in) on 14 October 2009.
Record daily precipitation for each month at Gilroy
Month
Record daily precipitation (mm)
Date
Jan
115.6 mm (4.6 in)
31 January 1963
Feb
81.5 mm (3.2 in)
1 February 1963
Mar
102.9 mm (4.1 in)
10 March 2023
Apr
92.7 mm (3.6 in)
3 April 1958
May
47.5 mm (1.9 in)
16 May 1996
Jun
19.6 mm (0.8 in)
2 June 1967
Jul
16.8 mm (0.7 in)
9 July 1974
Aug
17.3 mm (0.7 in)
19 August 1976
Sep
51.8 mm (2.0 in)
29 September 1976
Oct
151.1 mm (5.9 in)
14 October 2009
Nov
71.1 mm (2.8 in)
8 November 2002
Dec
137.2 mm (5.4 in)
22 December 1916
Period of Record Coverage
1957 to 2023
Complete yearUnder 90 percent of days
67 years of record at Gilroy, 1957 to 2023. 16 years have data for under 90 percent of days and are left out of rankings: 1957, 1981, 1986, 1987, 1998, 2000, 2008, 2009 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 45 complete years at Gilroy, 1958 to 2021. Blue stripes are years cooler than the station's own mean of 15.7 C (60.3 F); red stripes are warmer. The coolest year was 1964, at 14.3 C (57.8 F), and the warmest was 2014, at 17.4 C (63.2 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at Gilroy as warming stripes, 1958 to 2021
Year
Annual mean temperature
Difference from the station mean
1958
16.0 C
+0.26 C
1959
15.9 C
+0.16 C
1960
15.1 C
-0.59 C
1961
15.1 C
-0.65 C
1962
14.6 C
-1.09 C
1963
14.6 C
-1.10 C
1964
14.3 C
-1.40 C
1965
14.6 C
-1.16 C
1966
15.1 C
-0.60 C
1967
14.9 C
-0.79 C
1968
15.1 C
-0.64 C
1969
14.9 C
-0.85 C
1970
15.0 C
-0.68 C
1971
14.4 C
-1.33 C
1972
15.2 C
-0.52 C
1973
15.2 C
-0.49 C
1974
15.4 C
-0.29 C
1975
15.0 C
-0.70 C
1976
15.8 C
+0.05 C
1977
15.9 C
+0.21 C
1978
16.0 C
+0.24 C
1979
16.0 C
+0.29 C
1980
15.6 C
-0.10 C
1982
15.1 C
-0.60 C
1983
16.1 C
+0.38 C
1984
15.6 C
-0.09 C
1985
14.6 C
-1.10 C
1991
15.7 C
+0.02 C
1992
16.6 C
+0.93 C
1993
16.1 C
+0.36 C
1994
15.6 C
-0.16 C
1995
16.8 C
+1.04 C
1996
17.3 C
+1.56 C
1997
17.3 C
+1.61 C
2002
16.3 C
+0.57 C
2003
16.6 C
+0.90 C
2004
16.6 C
+0.93 C
2005
16.6 C
+0.86 C
2006
16.1 C
+0.42 C
2010
15.4 C
-0.27 C
2012
16.1 C
+0.35 C
2013
15.9 C
+0.15 C
2014
17.4 C
+1.65 C
2020
17.1 C
+1.43 C
2021
16.6 C
+0.84 C
The annual mean temperature here has risen by 0.3 C (0.2 to 0.4) per decade over 1958 to 2021. In Fahrenheit: 0.6 F (0.4 to 0.8) 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 Gilroy
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.3 C (0.2 to 0.4) per decade
0.6 F (0.4 to 0.8) per decade
1958 to 2021
45
Rise
Mean daily maximum
0.2 C (0.1 to 0.3) per decade
0.4 F (0.1 to 0.6) per decade
1958 to 2021
45
Rise
Mean daily minimum
0.5 C (0.3 to 0.6) per decade
0.8 F (0.6 to 1.0) per decade
1958 to 2021
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
1906 to 2026
Yearly extremes at Gilroy: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
46.1 C (115.0 F)
1972
41.1 C (106.0 F)
67
Coldest night (TNn)
-8.3 C (17.1 F)
1990
-3.9 C (25.0 F)
68
Wettest day (Rx1day)
151.1 mm (5.9 in)
2009
51.6 mm (2.0 in)
81
Wettest five days (Rx5day)
297.1 mm (11.7 in)
1914
105.3 mm (4.1 in)
80
Longest dry spell (CDD)
188 days
1999
99 days
81
Hottest day (TXx)
The hottest day of the year at Gilroy, 1906 to 2026. The record is 46.1 C (115.0 F) in 1972, marked on the chart; the median year is 41.1 C (106.0 F).
Hottest day (TXx) at Gilroy by year
Year
Hottest day (TXx)
1906
n/a
1907
n/a
1908
n/a
1909
n/a
1910
n/a
1911
n/a
1912
n/a
1913
n/a
1914
n/a
1915
n/a
1916
n/a
1917
n/a
1918
n/a
1957
43.3 C (109.9 F)
1958
38.9 C (102.0 F)
1959
42.8 C (109.0 F)
1960
42.2 C (108.0 F)
1961
44.4 C (111.9 F)
1962
40.0 C (104.0 F)
1963
42.2 C (108.0 F)
1964
40.6 C (105.1 F)
1965
36.7 C (98.1 F)
1966
41.1 C (106.0 F)
1967
39.4 C (102.9 F)
1968
38.9 C (102.0 F)
1969
38.3 C (100.9 F)
1970
41.1 C (106.0 F)
1971
42.8 C (109.0 F)
1972
46.1 C (115.0 F)
1973
43.3 C (109.9 F)
1974
40.6 C (105.1 F)
1975
42.8 C (109.0 F)
1976
43.3 C (109.9 F)
1977
42.8 C (109.0 F)
1978
41.1 C (106.0 F)
1979
41.7 C (107.1 F)
1980
41.7 C (107.1 F)
1981
43.3 C (109.9 F)
1982
37.2 C (99.0 F)
1983
41.7 C (107.1 F)
1984
39.4 C (102.9 F)
1985
37.8 C (100.0 F)
1986
37.8 C (100.0 F)
1987
40.6 C (105.1 F)
1988
41.7 C (107.1 F)
1989
40.6 C (105.1 F)
1990
41.1 C (106.0 F)
1991
38.9 C (102.0 F)
1992
39.4 C (102.9 F)
1993
41.7 C (107.1 F)
1994
40.0 C (104.0 F)
1995
41.7 C (107.1 F)
1996
41.7 C (107.1 F)
1997
44.4 C (111.9 F)
1998
42.8 C (109.0 F)
1999
41.7 C (107.1 F)
2000
38.9 C (102.0 F)
2001
40.0 C (104.0 F)
2002
41.7 C (107.1 F)
2003
41.1 C (106.0 F)
2004
39.4 C (102.9 F)
2005
40.0 C (104.0 F)
2006
44.4 C (111.9 F)
2007
38.3 C (100.9 F)
2008
41.7 C (107.1 F)
2009
38.9 C (102.0 F)
2010
40.6 C (105.1 F)
2011
37.8 C (100.0 F)
2012
40.0 C (104.0 F)
2013
38.3 C (100.9 F)
2014
38.9 C (102.0 F)
2015
41.7 C (107.1 F)
2016
38.9 C (102.0 F)
2017
44.4 C (111.9 F)
2018
40.0 C (104.0 F)
2019
41.7 C (107.1 F)
2020
44.4 C (111.9 F)
2021
41.1 C (106.0 F)
2022
45.0 C (113.0 F)
2023
33.3 C (91.9 F)
2026
n/a
Coldest night (TNn)
The coldest night of the year at Gilroy, 1906 to 2026. The record is -8.3 C (17.1 F) in 1990, marked on the chart; the median year is -3.9 C (25.0 F).
Coldest night (TNn) at Gilroy by year
Year
Coldest night (TNn)
1906
n/a
1907
10.0 C (50.0 F)
1908
n/a
1909
n/a
1910
n/a
1911
n/a
1912
n/a
1913
n/a
1914
n/a
1915
n/a
1916
n/a
1917
n/a
1918
n/a
1957
-3.9 C (25.0 F)
1958
-5.0 C (23.0 F)
1959
-3.3 C (26.1 F)
1960
-6.7 C (19.9 F)
1961
-5.0 C (23.0 F)
1962
-5.0 C (23.0 F)
1963
-7.8 C (18.0 F)
1964
-4.4 C (24.1 F)
1965
-5.0 C (23.0 F)
1966
-5.0 C (23.0 F)
1967
-3.9 C (25.0 F)
1968
-5.6 C (21.9 F)
1969
-3.3 C (26.1 F)
1970
-4.4 C (24.1 F)
1971
-5.6 C (21.9 F)
1972
-7.8 C (18.0 F)
1973
-6.1 C (21.0 F)
1974
-5.0 C (23.0 F)
1975
-5.0 C (23.0 F)
1976
-5.6 C (21.9 F)
1977
-3.3 C (26.1 F)
1978
-6.1 C (21.0 F)
1979
-6.7 C (19.9 F)
1980
-2.8 C (27.0 F)
1981
0.0 C (32.0 F)
1982
-3.9 C (25.0 F)
1983
-2.2 C (28.0 F)
1984
-3.3 C (26.1 F)
1985
-4.4 C (24.1 F)
1986
-1.7 C (28.9 F)
1987
-5.6 C (21.9 F)
1988
-2.8 C (27.0 F)
1989
-5.0 C (23.0 F)
1990
-8.3 C (17.1 F)
1991
-3.3 C (26.1 F)
1992
-2.8 C (27.0 F)
1993
-3.3 C (26.1 F)
1994
-3.3 C (26.1 F)
1995
-0.6 C (30.9 F)
1996
-1.1 C (30.0 F)
1997
-3.9 C (25.0 F)
1998
-5.6 C (21.9 F)
1999
-0.6 C (30.9 F)
2000
-1.1 C (30.0 F)
2001
-2.8 C (27.0 F)
2002
-7.2 C (19.0 F)
2003
-1.7 C (28.9 F)
2004
-2.2 C (28.0 F)
2005
-0.6 C (30.9 F)
2006
-2.8 C (27.0 F)
2007
-6.1 C (21.0 F)
2008
-2.8 C (27.0 F)
2009
-2.8 C (27.0 F)
2010
-2.2 C (28.0 F)
2011
-3.9 C (25.0 F)
2012
-6.7 C (19.9 F)
2013
-6.1 C (21.0 F)
2014
-7.2 C (19.0 F)
2015
-6.7 C (19.9 F)
2016
-4.4 C (24.1 F)
2017
-3.3 C (26.1 F)
2018
-1.7 C (28.9 F)
2019
-2.2 C (28.0 F)
2020
-1.1 C (30.0 F)
2021
-0.6 C (30.9 F)
2022
-1.7 C (28.9 F)
2023
-1.7 C (28.9 F)
2026
n/a
Wettest day (Rx1day)
The wettest day of the year at Gilroy, 1906 to 2026. The record is 151.1 mm (5.9 in) in 2009, marked on the chart; the median year is 51.6 mm (2.0 in).
Wettest day (Rx1day) at Gilroy by year
Year
Wettest day (Rx1day)
1906
106.7 mm (4.2 in)
1907
60.5 mm (2.4 in)
1908
32.0 mm (1.3 in)
1909
108.0 mm (4.3 in)
1910
31.8 mm (1.3 in)
1911
59.2 mm (2.3 in)
1912
24.9 mm (1.0 in)
1913
113.0 mm (4.4 in)
1914
113.0 mm (4.4 in)
1915
55.9 mm (2.2 in)
1916
137.2 mm (5.4 in)
1917
15.0 mm (0.6 in)
1918
50.8 mm (2.0 in)
1957
36.1 mm (1.4 in)
1958
92.7 mm (3.6 in)
1959
57.4 mm (2.3 in)
1960
65.5 mm (2.6 in)
1961
27.9 mm (1.1 in)
1962
62.2 mm (2.4 in)
1963
115.6 mm (4.6 in)
1964
41.4 mm (1.6 in)
1965
36.8 mm (1.4 in)
1966
50.3 mm (2.0 in)
1967
64.0 mm (2.5 in)
1968
40.4 mm (1.6 in)
1969
112.5 mm (4.4 in)
1970
54.6 mm (2.1 in)
1971
50.8 mm (2.0 in)
1972
64.5 mm (2.5 in)
1973
36.3 mm (1.4 in)
1974
50.3 mm (2.0 in)
1975
41.4 mm (1.6 in)
1976
51.8 mm (2.0 in)
1977
33.5 mm (1.3 in)
1978
48.3 mm (1.9 in)
1979
59.2 mm (2.3 in)
1980
66.0 mm (2.6 in)
1981
52.1 mm (2.1 in)
1982
87.6 mm (3.4 in)
1983
55.1 mm (2.2 in)
1984
35.3 mm (1.4 in)
1985
49.5 mm (1.9 in)
1986
56.9 mm (2.2 in)
1987
21.6 mm (0.9 in)
1988
33.0 mm (1.3 in)
1989
29.2 mm (1.1 in)
1990
34.5 mm (1.4 in)
1991
71.6 mm (2.8 in)
1992
46.0 mm (1.8 in)
1993
64.8 mm (2.6 in)
1994
35.6 mm (1.4 in)
1995
71.4 mm (2.8 in)
1996
51.3 mm (2.0 in)
1997
59.9 mm (2.4 in)
1998
49.0 mm (1.9 in)
1999
34.0 mm (1.3 in)
2000
73.2 mm (2.9 in)
2001
55.9 mm (2.2 in)
2002
71.1 mm (2.8 in)
2003
63.8 mm (2.5 in)
2004
49.5 mm (1.9 in)
2005
51.6 mm (2.0 in)
2006
38.6 mm (1.5 in)
2007
17.8 mm (0.7 in)
2008
90.2 mm (3.6 in)
2009
151.1 mm (5.9 in)
2010
42.4 mm (1.7 in)
2011
44.5 mm (1.8 in)
2012
83.8 mm (3.3 in)
2013
15.7 mm (0.6 in)
2014
88.9 mm (3.5 in)
2015
50.8 mm (2.0 in)
2016
50.8 mm (2.0 in)
2017
54.6 mm (2.1 in)
2018
47.0 mm (1.9 in)
2019
50.8 mm (2.0 in)
2020
46.7 mm (1.8 in)
2021
78.2 mm (3.1 in)
2022
53.8 mm (2.1 in)
2023
102.9 mm (4.1 in)
2026
47.5 mm (1.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Gilroy, 1906 to 2026. The record is 297.1 mm (11.7 in) in 1914, marked on the chart; the median year is 105.3 mm (4.1 in).
Wettest five days (Rx5day) at Gilroy by year
Year
Wettest five days (Rx5day)
1906
192.6 mm (7.6 in)
1907
110.0 mm (4.3 in)
1908
49.0 mm (1.9 in)
1909
148.9 mm (5.9 in)
1910
71.7 mm (2.8 in)
1911
96.0 mm (3.8 in)
1912
55.2 mm (2.2 in)
1913
175.2 mm (6.9 in)
1914
297.1 mm (11.7 in)
1915
61.4 mm (2.4 in)
1916
98.0 mm (3.9 in)
1917
n/a
1918
60.5 mm (2.4 in)
1957
91.0 mm (3.6 in)
1958
150.0 mm (5.9 in)
1959
138.4 mm (5.4 in)
1960
95.5 mm (3.8 in)
1961
63.0 mm (2.5 in)
1962
111.3 mm (4.4 in)
1963
238.2 mm (9.4 in)
1964
117.1 mm (4.6 in)
1965
91.2 mm (3.6 in)
1966
137.2 mm (5.4 in)
1967
148.6 mm (5.9 in)
1968
49.3 mm (1.9 in)
1969
169.7 mm (6.7 in)
1970
113.5 mm (4.5 in)
1971
112.5 mm (4.4 in)
1972
138.2 mm (5.4 in)
1973
83.8 mm (3.3 in)
1974
109.7 mm (4.3 in)
1975
67.6 mm (2.7 in)
1976
80.5 mm (3.2 in)
1977
77.2 mm (3.0 in)
1978
103.0 mm (4.1 in)
1979
86.9 mm (3.4 in)
1980
123.2 mm (4.9 in)
1981
126.0 mm (5.0 in)
1982
145.0 mm (5.7 in)
1983
111.8 mm (4.4 in)
1984
60.0 mm (2.4 in)
1985
63.0 mm (2.5 in)
1986
103.4 mm (4.1 in)
1987
48.0 mm (1.9 in)
1988
83.3 mm (3.3 in)
1989
31.4 mm (1.2 in)
1990
53.3 mm (2.1 in)
1991
123.7 mm (4.9 in)
1992
107.7 mm (4.2 in)
1993
103.9 mm (4.1 in)
1994
69.9 mm (2.8 in)
1995
128.0 mm (5.0 in)
1996
145.0 mm (5.7 in)
1997
142.2 mm (5.6 in)
1998
119.9 mm (4.7 in)
1999
75.8 mm (3.0 in)
2000
128.3 mm (5.1 in)
2001
78.1 mm (3.1 in)
2002
110.3 mm (4.3 in)
2003
69.2 mm (2.7 in)
2004
117.2 mm (4.6 in)
2005
150.6 mm (5.9 in)
2006
65.8 mm (2.6 in)
2007
33.8 mm (1.3 in)
2008
127.0 mm (5.0 in)
2009
166.8 mm (6.6 in)
2010
102.7 mm (4.0 in)
2011
103.4 mm (4.1 in)
2012
145.0 mm (5.7 in)
2013
15.8 mm (0.6 in)
2014
135.9 mm (5.4 in)
2015
71.2 mm (2.8 in)
2016
70.3 mm (2.8 in)
2017
37.1 mm (1.5 in)
2018
45.0 mm (1.8 in)
2019
106.7 mm (4.2 in)
2020
61.4 mm (2.4 in)
2021
109.7 mm (4.3 in)
2022
118.8 mm (4.7 in)
2023
119.1 mm (4.7 in)
2026
110.5 mm (4.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Gilroy, 1906 to 2026. The record is 188 days in 1999, marked on the chart; the median year is 99 days.
Longest dry spell (CDD) at Gilroy by year
Year
Longest dry spell (CDD)
1906
34 days
1907
129 days
1908
152 days
1909
99 days
1910
141 days
1911
100 days
1912
31 days
1913
21 days
1914
43 days
1915
44 days
1916
25 days
1917
3 days
1918
5 days
1957
106 days
1958
92 days
1959
144 days
1960
128 days
1961
171 days
1962
173 days
1963
124 days
1964
82 days
1965
116 days
1966
80 days
1967
119 days
1968
151 days
1969
135 days
1970
132 days
1971
124 days
1972
121 days
1973
175 days
1974
83 days
1975
80 days
1976
65 days
1977
100 days
1978
127 days
1979
89 days
1980
114 days
1981
166 days
1982
85 days
1983
104 days
1984
94 days
1985
46 days
1986
57 days
1987
116 days
1988
144 days
1989
77 days
1990
68 days
1991
47 days
1992
119 days
1993
126 days
1994
91 days
1995
137 days
1996
163 days
1997
87 days
1998
85 days
1999
188 days
2000
63 days
2001
132 days
2002
169 days
2003
89 days
2004
114 days
2005
146 days
2006
161 days
2007
140 days
2008
88 days
2009
127 days
2010
142 days
2011
92 days
2012
97 days
2013
79 days
2014
59 days
2015
26 days
2016
21 days
2017
51 days
2018
32 days
2019
20 days
2020
56 days
2021
139 days
2022
148 days
2023
30 days
2026
61 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 Gilroy falls on 26 February and the median first autumn frost on 23 November, which leaves a median of 280 days between them.
Fitted over all years, the growing season changes by +8.6 days per decade at this station.
Frost dates and growing season at Gilroy
Measure
Median, all years
Earliest period
Recent period (1971 to 2021)
Recent against earliest
Fitted trend
Last spring frost
26 February
n/a
18 February
n/a
-5.7 days per decade
First autumn frost
23 November
n/a
24 November
n/a
+2.8 days per decade
Growing days
280 days
n/a
283 days
n/a
+8.6 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
55 years, 1907 to 2021
A day with at least 53.0 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 144.9 mm (5.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Gilroy: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
53.0 mm (2.1 in)
5 years
75.3 mm (3.0 in)
10 years
90.9 mm (3.6 in)
25 years
111.8 mm (4.4 in)
50 years
128.0 mm (5.0 in)
100 years
144.9 mm (5.7 in)
Longer than the 55 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, 55 years of values from 1907 to 2021.
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: 151.1 mm (5.9 in) in 2009; 115.6 mm (4.6 in) in 1963; 112.5 mm (4.4 in) in 1969.
Station Changes
2 suspected
2 changes were suspected in the annual mean temperature of Gilroy, at 1972 and 2006. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1972 ran 0.4 C (0.6 F) higher than in the years before (possible change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 2006 ran 0.4 C (0.7 F) lower than in the years before (possible change).
Suspected changes in the annual mean temperature at Gilroy, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1972
+0.4
+0.6
possible
5
2006
-0.4
-0.7
possible
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 Gilroy standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Gilroy 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.