Record envelope, standing records and threshold days for Vacaville (USC00049200), California, United States, with 117 years of record.
Key Facts for Vacaville
Vacaville (USC00049200) is a weather station in California, United States at 38.40 latitude and -121.96 longitude, 34 m (110 ft) above sea level.
The station reports from 1893 to 2009, 117 years of record.
1,464 records set at Vacaville still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Vacaville set a daily record high minimum temperature of 15.6 C (60.1 F) on 10 November 2009.
About the Station
Location: California, United States, 38.40 latitude, -121.96 longitude.
Elevation: 34 m (110 ft).
Period of record: 1893 to 2009, 117 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 Vacaville. 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 Vacaville, 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)
-7.8 C (18.0 F)
n/a
n/a
Feb
27.8 C (82.0 F)
-8.9 C (16.0 F)
n/a
n/a
Mar
32.2 C (90.0 F)
-3.3 C (26.1 F)
n/a
n/a
Apr
37.2 C (99.0 F)
-2.8 C (27.0 F)
n/a
n/a
May
42.8 C (109.0 F)
-1.1 C (30.0 F)
n/a
n/a
Jun
46.1 C (115.0 F)
2.2 C (36.0 F)
n/a
n/a
Jul
46.7 C (116.1 F)
4.4 C (39.9 F)
n/a
n/a
Aug
45.6 C (114.1 F)
3.9 C (39.0 F)
n/a
n/a
Sep
44.4 C (111.9 F)
0.0 C (32.0 F)
n/a
n/a
Oct
41.7 C (107.1 F)
-5.0 C (23.0 F)
n/a
n/a
Nov
32.8 C (91.0 F)
-7.2 C (19.0 F)
n/a
n/a
Dec
26.7 C (80.1 F)
-10.0 C (14.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Vacaville still stand. 1914 holds the most, with 97.
Standing records at Vacaville by the year they were set
Year set
Standing records
1893
3
1894
1
1895
1
1896
1
1897
1
1899
3
1905
20
1906
15
1907
17
1908
25
1909
9
1910
14
1911
20
1912
18
1913
22
1914
97
1915
5
1916
12
1917
5
1918
2
1919
20
1920
31
1921
26
1922
22
1923
30
1924
31
1925
28
1926
14
1927
10
1928
10
1929
27
1930
24
1931
33
1932
32
1933
31
1934
11
1935
10
1936
17
1937
8
1938
11
1939
17
1940
2
1941
12
1942
12
1943
5
1944
10
1945
12
1946
15
1947
11
1948
18
1949
21
1950
20
1951
9
1952
14
1953
7
1954
12
1955
20
1956
11
1957
15
1958
10
1959
12
1960
10
1961
20
1962
11
1963
20
1964
15
1965
8
1966
7
1967
14
1968
15
1969
7
1970
5
1971
6
1972
18
1973
5
1974
8
1975
10
1976
17
1977
7
1978
6
1979
1
1980
2
1981
9
1982
11
1983
6
1984
8
1985
10
1986
7
1987
6
1988
4
1989
12
1990
11
1991
13
1992
8
1993
7
1994
1
1995
9
1996
17
1997
5
1998
6
1999
15
2000
15
2001
11
2002
5
2003
11
2004
13
2005
1
2006
15
2007
9
2008
11
2009
14
All-Time Record Progression
5 new records
5 all-time records were set at Vacaville between 27 February 1940 and 23 July 2006. Each dot is a new record.
When Vacaville set new all-time records
Date
Kind
Detail
1940-02-27
Record daily precipitation
Record daily precipitation 154.9 mm (6.1 in)
1960-06-02
Record high minimum temperature
Record high minimum temperature 25.6 C (78.1 F)
1982-05-24
Record high minimum temperature
Record high minimum temperature 26.1 C (79.0 F)
2000-06-14
Record high minimum temperature
Record high minimum temperature 28.9 C (84.0 F)
2006-07-23
Record high maximum temperature
Record high maximum temperature 46.7 C (116.1 F)
Wettest Day of Each Month
Feb: 154.9 mm (6.1 in)
The wettest day on record for each calendar month at Vacaville. The most was 154.9 mm (6.1 in) on 27 February 1940.
Record daily precipitation for each month at Vacaville
Month
Record daily precipitation (mm)
Date
Jan
138.4 mm (5.4 in)
21 January 1967
Feb
154.9 mm (6.1 in)
27 February 1940
Mar
97.5 mm (3.8 in)
22 March 1899
Apr
113.0 mm (4.4 in)
1 April 1927
May
38.6 mm (1.5 in)
1 May 1905
Jun
23.6 mm (0.9 in)
2 June 1967
Jul
31.0 mm (1.2 in)
8 July 1974
Aug
29.2 mm (1.1 in)
21 August 2003
Sep
94.7 mm (3.7 in)
18 September 1959
Oct
102.9 mm (4.1 in)
13 October 1962
Nov
87.1 mm (3.4 in)
9 November 1927
Dec
148.6 mm (5.9 in)
19 December 1955
Period of Record Coverage
1893 to 2009
Complete yearUnder 90 percent of days
114 years of record at Vacaville, 1893 to 2009. 24 years have data for under 90 percent of days and are left out of rankings: 1893, 1894, 1895, 1896, 1897, 1898, 1899, 1900 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 87 complete years at Vacaville, 1905 to 2008. Blue stripes are years cooler than the station's own mean of 16.0 C (60.8 F); red stripes are warmer. The coolest year was 1948, at 14.5 C (58.2 F), and the warmest was 1997, at 17.9 C (64.1 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Vacaville as warming stripes, 1905 to 2008
Year
Annual mean temperature
Difference from the station mean
1905
15.5 C
-0.46 C
1906
16.0 C
+0.02 C
1907
15.6 C
-0.42 C
1908
15.8 C
-0.24 C
1909
15.5 C
-0.48 C
1910
16.0 C
+0.03 C
1911
15.0 C
-0.96 C
1912
15.4 C
-0.63 C
1920
15.0 C
-0.99 C
1921
15.2 C
-0.76 C
1922
14.7 C
-1.30 C
1923
14.8 C
-1.19 C
1924
15.0 C
-0.98 C
1926
15.8 C
-0.19 C
1927
15.9 C
-0.13 C
1928
16.4 C
+0.39 C
1929
16.3 C
+0.28 C
1930
15.5 C
-0.50 C
1931
15.5 C
-0.45 C
1932
15.4 C
-0.63 C
1933
15.2 C
-0.84 C
1934
17.1 C
+1.10 C
1935
15.7 C
-0.30 C
1936
16.6 C
+0.63 C
1937
15.8 C
-0.23 C
1938
15.6 C
-0.43 C
1939
16.1 C
+0.13 C
1940
16.1 C
+0.09 C
1941
15.4 C
-0.62 C
1942
15.2 C
-0.76 C
1943
15.9 C
-0.07 C
1944
15.6 C
-0.38 C
1945
15.8 C
-0.22 C
1946
14.9 C
-1.06 C
1947
15.5 C
-0.49 C
1948
14.5 C
-1.45 C
1949
15.3 C
-0.69 C
1950
16.6 C
+0.60 C
1951
15.7 C
-0.25 C
1952
15.7 C
-0.32 C
1953
16.0 C
+0.02 C
1954
15.5 C
-0.54 C
1955
15.4 C
-0.63 C
1956
15.5 C
-0.49 C
1957
16.0 C
-0.03 C
1958
17.1 C
+1.14 C
1959
17.4 C
+1.40 C
1960
16.6 C
+0.57 C
1961
16.2 C
+0.22 C
1962
15.7 C
-0.27 C
1963
14.8 C
-1.21 C
1964
16.1 C
+0.09 C
1965
15.9 C
-0.07 C
1966
16.3 C
+0.32 C
1967
15.5 C
-0.52 C
1968
15.7 C
-0.29 C
1969
15.7 C
-0.30 C
1970
16.2 C
+0.23 C
1971
14.8 C
-1.15 C
1972
15.2 C
-0.84 C
1973
15.7 C
-0.27 C
1974
15.7 C
-0.32 C
1975
15.1 C
-0.91 C
1976
16.0 C
-0.02 C
1977
16.0 C
0.00 C
1979
15.9 C
-0.11 C
1981
16.3 C
+0.33 C
1982
14.9 C
-1.10 C
1983
16.0 C
-0.02 C
1984
16.3 C
+0.26 C
1987
16.3 C
+0.32 C
1991
16.7 C
+0.72 C
1992
17.3 C
+1.27 C
1993
16.4 C
+0.43 C
1995
17.2 C
+1.25 C
1996
17.7 C
+1.73 C
1997
17.9 C
+1.87 C
1999
16.7 C
+0.66 C
2000
16.9 C
+0.88 C
2001
17.5 C
+1.48 C
2002
16.9 C
+0.94 C
2003
17.7 C
+1.75 C
2004
17.4 C
+1.43 C
2005
17.2 C
+1.24 C
2006
17.3 C
+1.29 C
2007
17.3 C
+1.33 C
2008
17.5 C
+1.47 C
The annual mean temperature here has risen by 0.2 C (0.1 to 0.2) per decade over 1905 to 2008. In Fahrenheit: 0.3 F (0.2 to 0.4) per decade. The slope is a straight line fitted to 87 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Vacaville
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.2 C (0.1 to 0.2) per decade
0.3 F (0.2 to 0.4) per decade
1905 to 2008
87
Rise
Mean daily maximum
0.06 C (0.00 to 0.12) per decade
0.11 F (-0.01 to 0.22) per decade
1905 to 2008
87
Not clearly different from zero
Mean daily minimum
0.3 C (0.2 to 0.3) per decade
0.5 F (0.4 to 0.6) per decade
1905 to 2008
87
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
1893 to 2009
Yearly extremes at Vacaville: 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)
2006
42.8 C (109.0 F)
114
Coldest night (TNn)
-10.0 C (14.0 F)
1924
-4.4 C (24.1 F)
115
Wettest day (Rx1day)
154.9 mm (6.1 in)
1940
61.5 mm (2.4 in)
117
Wettest five days (Rx5day)
339.3 mm (13.4 in)
1955
126.0 mm (5.0 in)
117
Longest dry spell (CDD)
191 days
1903
115 days
117
Hottest day (TXx)
The hottest day of the year at Vacaville, 1893 to 2009. The record is 46.7 C (116.1 F) in 2006, marked on the chart; the median year is 42.8 C (109.0 F).
Hottest day (TXx) at Vacaville by year
Year
Hottest day (TXx)
1893
42.2 C (108.0 F)
1894
43.3 C (109.9 F)
1895
41.1 C (106.0 F)
1896
41.7 C (107.1 F)
1897
42.2 C (108.0 F)
1898
38.3 C (100.9 F)
1899
41.1 C (106.0 F)
1900
27.2 C (81.0 F)
1901
n/a
1902
n/a
1903
n/a
1904
17.8 C (64.0 F)
1905
46.1 C (115.0 F)
1906
42.8 C (109.0 F)
1907
40.0 C (104.0 F)
1908
43.9 C (111.0 F)
1909
41.7 C (107.1 F)
1910
42.8 C (109.0 F)
1911
41.1 C (106.0 F)
1912
41.7 C (107.1 F)
1913
36.7 C (98.1 F)
1914
41.1 C (106.0 F)
1915
42.8 C (109.0 F)
1916
41.7 C (107.1 F)
1917
28.9 C (84.0 F)
1918
21.1 C (70.0 F)
1919
41.7 C (107.1 F)
1920
44.4 C (111.9 F)
1921
42.8 C (109.0 F)
1922
42.8 C (109.0 F)
1923
43.9 C (111.0 F)
1924
41.1 C (106.0 F)
1925
45.0 C (113.0 F)
1926
43.9 C (111.0 F)
1927
42.8 C (109.0 F)
1928
41.1 C (106.0 F)
1929
43.9 C (111.0 F)
1930
41.7 C (107.1 F)
1931
44.4 C (111.9 F)
1932
42.2 C (108.0 F)
1933
43.9 C (111.0 F)
1934
43.9 C (111.0 F)
1935
44.4 C (111.9 F)
1936
43.3 C (109.9 F)
1937
43.3 C (109.9 F)
1938
43.3 C (109.9 F)
1939
42.8 C (109.0 F)
1940
41.7 C (107.1 F)
1941
41.1 C (106.0 F)
1942
43.9 C (111.0 F)
1943
42.2 C (108.0 F)
1944
44.4 C (111.9 F)
1945
42.2 C (108.0 F)
1946
42.8 C (109.0 F)
1947
40.6 C (105.1 F)
1948
43.3 C (109.9 F)
1949
42.2 C (108.0 F)
1950
45.6 C (114.1 F)
1951
42.8 C (109.0 F)
1952
43.3 C (109.9 F)
1953
42.8 C (109.0 F)
1954
44.4 C (111.9 F)
1955
44.4 C (111.9 F)
1956
43.3 C (109.9 F)
1957
43.3 C (109.9 F)
1958
41.1 C (106.0 F)
1959
43.3 C (109.9 F)
1960
43.3 C (109.9 F)
1961
46.1 C (115.0 F)
1962
40.6 C (105.1 F)
1963
40.0 C (104.0 F)
1964
41.1 C (106.0 F)
1965
40.6 C (105.1 F)
1966
43.9 C (111.0 F)
1967
41.1 C (106.0 F)
1968
41.7 C (107.1 F)
1969
41.7 C (107.1 F)
1970
41.7 C (107.1 F)
1971
43.3 C (109.9 F)
1972
43.9 C (111.0 F)
1973
41.7 C (107.1 F)
1974
40.6 C (105.1 F)
1975
43.9 C (111.0 F)
1976
41.1 C (106.0 F)
1977
41.1 C (106.0 F)
1978
42.8 C (109.0 F)
1979
40.0 C (104.0 F)
1980
40.6 C (105.1 F)
1981
40.6 C (105.1 F)
1982
38.9 C (102.0 F)
1983
40.6 C (105.1 F)
1984
41.7 C (107.1 F)
1985
40.6 C (105.1 F)
1986
37.8 C (100.0 F)
1987
40.0 C (104.0 F)
1988
42.8 C (109.0 F)
1989
43.3 C (109.9 F)
1990
43.3 C (109.9 F)
1991
43.3 C (109.9 F)
1992
42.8 C (109.0 F)
1993
42.2 C (108.0 F)
1994
40.6 C (105.1 F)
1995
42.8 C (109.0 F)
1996
43.9 C (111.0 F)
1997
42.2 C (108.0 F)
1998
41.7 C (107.1 F)
1999
43.3 C (109.9 F)
2000
42.2 C (108.0 F)
2001
43.3 C (109.9 F)
2002
44.4 C (111.9 F)
2003
42.8 C (109.0 F)
2004
41.1 C (106.0 F)
2005
42.8 C (109.0 F)
2006
46.7 C (116.1 F)
2007
42.8 C (109.0 F)
2008
44.4 C (111.9 F)
2009
43.9 C (111.0 F)
Coldest night (TNn)
The coldest night of the year at Vacaville, 1893 to 2009. The record is -10.0 C (14.0 F) in 1924, marked on the chart; the median year is -4.4 C (24.1 F).
Coldest night (TNn) at Vacaville by year
Year
Coldest night (TNn)
1893
0.0 C (32.0 F)
1894
0.6 C (33.1 F)
1895
-1.7 C (28.9 F)
1896
-1.1 C (30.0 F)
1897
0.0 C (32.0 F)
1898
0.0 C (32.0 F)
1899
-2.8 C (27.0 F)
1900
2.8 C (37.0 F)
1901
13.3 C (55.9 F)
1902
n/a
1903
n/a
1904
-2.2 C (28.0 F)
1905
-5.6 C (21.9 F)
1906
-4.4 C (24.1 F)
1907
-2.2 C (28.0 F)
1908
-3.9 C (25.0 F)
1909
-3.9 C (25.0 F)
1910
-3.9 C (25.0 F)
1911
-5.6 C (21.9 F)
1912
-3.9 C (25.0 F)
1913
-6.7 C (19.9 F)
1914
6.7 C (44.1 F)
1915
-2.2 C (28.0 F)
1916
-5.6 C (21.9 F)
1917
-4.4 C (24.1 F)
1918
-2.8 C (27.0 F)
1919
-3.9 C (25.0 F)
1920
-6.1 C (21.0 F)
1921
-7.2 C (19.0 F)
1922
-7.2 C (19.0 F)
1923
-6.7 C (19.9 F)
1924
-10.0 C (14.0 F)
1925
-5.0 C (23.0 F)
1926
-4.4 C (24.1 F)
1927
-4.4 C (24.1 F)
1928
-5.0 C (23.0 F)
1929
-5.0 C (23.0 F)
1930
-9.4 C (15.1 F)
1931
-5.0 C (23.0 F)
1932
-8.9 C (16.0 F)
1933
-3.9 C (25.0 F)
1934
-0.6 C (30.9 F)
1935
-5.0 C (23.0 F)
1936
-5.0 C (23.0 F)
1937
-7.8 C (18.0 F)
1938
-5.0 C (23.0 F)
1939
-5.0 C (23.0 F)
1940
-3.9 C (25.0 F)
1941
-3.9 C (25.0 F)
1942
-5.0 C (23.0 F)
1943
-5.6 C (21.9 F)
1944
-1.7 C (28.9 F)
1945
-5.6 C (21.9 F)
1946
-5.0 C (23.0 F)
1947
-6.7 C (19.9 F)
1948
-7.2 C (19.0 F)
1949
-7.8 C (18.0 F)
1950
-5.6 C (21.9 F)
1951
-3.9 C (25.0 F)
1952
-4.4 C (24.1 F)
1953
-3.3 C (26.1 F)
1954
-3.9 C (25.0 F)
1955
-3.9 C (25.0 F)
1956
-5.6 C (21.9 F)
1957
-5.6 C (21.9 F)
1958
-3.3 C (26.1 F)
1959
-3.3 C (26.1 F)
1960
-5.6 C (21.9 F)
1961
-5.0 C (23.0 F)
1962
-5.6 C (21.9 F)
1963
-5.6 C (21.9 F)
1964
-3.9 C (25.0 F)
1965
-5.0 C (23.0 F)
1966
-3.3 C (26.1 F)
1967
-4.4 C (24.1 F)
1968
-5.6 C (21.9 F)
1969
-4.4 C (24.1 F)
1970
-3.9 C (25.0 F)
1971
-3.9 C (25.0 F)
1972
-6.7 C (19.9 F)
1973
-6.1 C (21.0 F)
1974
-3.9 C (25.0 F)
1975
-5.0 C (23.0 F)
1976
-6.7 C (19.9 F)
1977
-3.3 C (26.1 F)
1978
-7.8 C (18.0 F)
1979
-4.4 C (24.1 F)
1980
-2.8 C (27.0 F)
1981
-1.1 C (30.0 F)
1982
-3.3 C (26.1 F)
1983
-1.1 C (30.0 F)
1984
-4.4 C (24.1 F)
1985
-4.4 C (24.1 F)
1986
-0.6 C (30.9 F)
1987
-3.3 C (26.1 F)
1988
-5.0 C (23.0 F)
1989
-8.9 C (16.0 F)
1990
-8.3 C (17.1 F)
1991
-3.3 C (26.1 F)
1992
-4.4 C (24.1 F)
1993
-5.0 C (23.0 F)
1994
-2.2 C (28.0 F)
1995
-0.6 C (30.9 F)
1996
-3.3 C (26.1 F)
1997
-3.9 C (25.0 F)
1998
-7.2 C (19.0 F)
1999
-2.2 C (28.0 F)
2000
-1.7 C (28.9 F)
2001
-3.3 C (26.1 F)
2002
-3.3 C (26.1 F)
2003
-1.7 C (28.9 F)
2004
-2.2 C (28.0 F)
2005
-1.1 C (30.0 F)
2006
-1.7 C (28.9 F)
2007
-5.0 C (23.0 F)
2008
-3.3 C (26.1 F)
2009
-3.3 C (26.1 F)
Wettest day (Rx1day)
The wettest day of the year at Vacaville, 1893 to 2009. The record is 154.9 mm (6.1 in) in 1940, marked on the chart; the median year is 61.5 mm (2.4 in).
Wettest day (Rx1day) at Vacaville by year
Year
Wettest day (Rx1day)
1893
43.2 mm (1.7 in)
1894
107.7 mm (4.2 in)
1895
61.5 mm (2.4 in)
1896
108.2 mm (4.3 in)
1897
52.6 mm (2.1 in)
1898
31.8 mm (1.3 in)
1899
97.5 mm (3.8 in)
1900
67.6 mm (2.7 in)
1901
43.2 mm (1.7 in)
1902
67.8 mm (2.7 in)
1903
29.7 mm (1.2 in)
1904
81.5 mm (3.2 in)
1905
38.6 mm (1.5 in)
1906
52.8 mm (2.1 in)
1907
51.3 mm (2.0 in)
1908
26.2 mm (1.0 in)
1909
98.3 mm (3.9 in)
1910
81.0 mm (3.2 in)
1911
81.8 mm (3.2 in)
1912
45.0 mm (1.8 in)
1913
124.5 mm (4.9 in)
1914
38.9 mm (1.5 in)
1915
114.8 mm (4.5 in)
1916
98.0 mm (3.9 in)
1917
71.1 mm (2.8 in)
1918
43.4 mm (1.7 in)
1919
27.2 mm (1.1 in)
1920
40.9 mm (1.6 in)
1921
45.7 mm (1.8 in)
1922
51.6 mm (2.0 in)
1923
40.6 mm (1.6 in)
1924
47.8 mm (1.9 in)
1925
36.3 mm (1.4 in)
1926
62.0 mm (2.4 in)
1927
113.0 mm (4.4 in)
1928
61.2 mm (2.4 in)
1929
52.1 mm (2.1 in)
1930
52.8 mm (2.1 in)
1931
114.6 mm (4.5 in)
1932
41.9 mm (1.6 in)
1933
55.1 mm (2.2 in)
1934
63.0 mm (2.5 in)
1935
77.2 mm (3.0 in)
1936
60.7 mm (2.4 in)
1937
77.5 mm (3.1 in)
1938
43.2 mm (1.7 in)
1939
37.8 mm (1.5 in)
1940
154.9 mm (6.1 in)
1941
78.2 mm (3.1 in)
1942
65.5 mm (2.6 in)
1943
121.4 mm (4.8 in)
1944
48.8 mm (1.9 in)
1945
89.4 mm (3.5 in)
1946
38.4 mm (1.5 in)
1947
68.1 mm (2.7 in)
1948
40.9 mm (1.6 in)
1949
37.3 mm (1.5 in)
1950
96.5 mm (3.8 in)
1951
63.2 mm (2.5 in)
1952
102.4 mm (4.0 in)
1953
55.1 mm (2.2 in)
1954
59.4 mm (2.3 in)
1955
148.6 mm (5.9 in)
1956
51.8 mm (2.0 in)
1957
38.6 mm (1.5 in)
1958
69.1 mm (2.7 in)
1959
94.7 mm (3.7 in)
1960
40.6 mm (1.6 in)
1961
46.5 mm (1.8 in)
1962
102.9 mm (4.1 in)
1963
132.8 mm (5.2 in)
1964
100.6 mm (4.0 in)
1965
41.4 mm (1.6 in)
1966
59.9 mm (2.4 in)
1967
138.4 mm (5.4 in)
1968
52.1 mm (2.1 in)
1969
63.5 mm (2.5 in)
1970
75.2 mm (3.0 in)
1971
22.4 mm (0.9 in)
1972
38.1 mm (1.5 in)
1973
112.3 mm (4.4 in)
1974
31.0 mm (1.2 in)
1975
46.0 mm (1.8 in)
1976
28.2 mm (1.1 in)
1977
67.6 mm (2.7 in)
1978
43.9 mm (1.7 in)
1979
65.8 mm (2.6 in)
1980
50.8 mm (2.0 in)
1981
67.3 mm (2.6 in)
1982
100.6 mm (4.0 in)
1983
75.9 mm (3.0 in)
1984
31.8 mm (1.3 in)
1985
71.4 mm (2.8 in)
1986
111.8 mm (4.4 in)
1987
62.7 mm (2.5 in)
1988
35.1 mm (1.4 in)
1989
33.3 mm (1.3 in)
1990
63.5 mm (2.5 in)
1991
55.4 mm (2.2 in)
1992
57.2 mm (2.3 in)
1993
120.1 mm (4.7 in)
1994
40.4 mm (1.6 in)
1995
130.8 mm (5.1 in)
1996
91.9 mm (3.6 in)
1997
95.5 mm (3.8 in)
1998
54.1 mm (2.1 in)
1999
63.0 mm (2.5 in)
2000
63.5 mm (2.5 in)
2001
55.9 mm (2.2 in)
2002
83.8 mm (3.3 in)
2003
76.2 mm (3.0 in)
2004
65.0 mm (2.6 in)
2005
133.1 mm (5.2 in)
2006
59.2 mm (2.3 in)
2007
31.5 mm (1.2 in)
2008
105.9 mm (4.2 in)
2009
50.8 mm (2.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Vacaville, 1893 to 2009. The record is 339.3 mm (13.4 in) in 1955, marked on the chart; the median year is 126.0 mm (5.0 in).
Wettest five days (Rx5day) at Vacaville by year
Year
Wettest five days (Rx5day)
1893
80.8 mm (3.2 in)
1894
139.7 mm (5.5 in)
1895
127.6 mm (5.0 in)
1896
229.6 mm (9.0 in)
1897
156.5 mm (6.2 in)
1898
43.8 mm (1.7 in)
1899
165.6 mm (6.5 in)
1900
122.0 mm (4.8 in)
1901
88.4 mm (3.5 in)
1902
188.7 mm (7.4 in)
1903
81.0 mm (3.2 in)
1904
131.8 mm (5.2 in)
1905
60.7 mm (2.4 in)
1906
171.7 mm (6.8 in)
1907
112.0 mm (4.4 in)
1908
52.3 mm (2.1 in)
1909
180.9 mm (7.1 in)
1910
40.6 mm (1.6 in)
1911
157.0 mm (6.2 in)
1912
82.9 mm (3.3 in)
1913
144.3 mm (5.7 in)
1914
120.3 mm (4.7 in)
1915
128.2 mm (5.0 in)
1916
134.6 mm (5.3 in)
1917
152.8 mm (6.0 in)
1918
75.9 mm (3.0 in)
1919
54.7 mm (2.2 in)
1920
76.2 mm (3.0 in)
1921
134.1 mm (5.3 in)
1922
123.9 mm (4.9 in)
1923
71.6 mm (2.8 in)
1924
85.7 mm (3.4 in)
1925
95.2 mm (3.7 in)
1926
166.9 mm (6.6 in)
1927
127.0 mm (5.0 in)
1928
118.1 mm (4.6 in)
1929
106.5 mm (4.2 in)
1930
76.6 mm (3.0 in)
1931
232.2 mm (9.1 in)
1932
81.8 mm (3.2 in)
1933
86.9 mm (3.4 in)
1934
116.6 mm (4.6 in)
1935
94.4 mm (3.7 in)
1936
130.0 mm (5.1 in)
1937
152.7 mm (6.0 in)
1938
127.8 mm (5.0 in)
1939
55.1 mm (2.2 in)
1940
227.9 mm (9.0 in)
1941
175.2 mm (6.9 in)
1942
192.0 mm (7.6 in)
1943
236.7 mm (9.3 in)
1944
111.6 mm (4.4 in)
1945
166.9 mm (6.6 in)
1946
90.3 mm (3.6 in)
1947
77.8 mm (3.1 in)
1948
62.5 mm (2.5 in)
1949
53.8 mm (2.1 in)
1950
158.8 mm (6.3 in)
1951
144.7 mm (5.7 in)
1952
163.9 mm (6.5 in)
1953
69.1 mm (2.7 in)
1954
110.7 mm (4.4 in)
1955
339.3 mm (13.4 in)
1956
94.7 mm (3.7 in)
1957
90.2 mm (3.6 in)
1958
129.3 mm (5.1 in)
1959
141.3 mm (5.6 in)
1960
92.4 mm (3.6 in)
1961
114.1 mm (4.5 in)
1962
207.6 mm (8.2 in)
1963
253.9 mm (10.0 in)
1964
200.4 mm (7.9 in)
1965
114.4 mm (4.5 in)
1966
129.4 mm (5.1 in)
1967
254.3 mm (10.0 in)
1968
95.9 mm (3.8 in)
1969
168.5 mm (6.6 in)
1970
174.9 mm (6.9 in)
1971
60.5 mm (2.4 in)
1972
101.2 mm (4.0 in)
1973
163.6 mm (6.4 in)
1974
78.0 mm (3.1 in)
1975
96.3 mm (3.8 in)
1976
47.5 mm (1.9 in)
1977
126.0 mm (5.0 in)
1978
141.7 mm (5.6 in)
1979
124.0 mm (4.9 in)
1980
175.3 mm (6.9 in)
1981
104.1 mm (4.1 in)
1982
194.9 mm (7.7 in)
1983
135.4 mm (5.3 in)
1984
82.6 mm (3.3 in)
1985
88.6 mm (3.5 in)
1986
245.2 mm (9.7 in)
1987
98.7 mm (3.9 in)
1988
83.5 mm (3.3 in)
1989
51.3 mm (2.0 in)
1990
77.7 mm (3.1 in)
1991
155.3 mm (6.1 in)
1992
125.7 mm (4.9 in)
1993
164.4 mm (6.5 in)
1994
94.8 mm (3.7 in)
1995
250.2 mm (9.9 in)
1996
136.1 mm (5.4 in)
1997
183.2 mm (7.2 in)
1998
170.7 mm (6.7 in)
1999
123.2 mm (4.9 in)
2000
156.0 mm (6.1 in)
2001
145.6 mm (5.7 in)
2002
248.7 mm (9.8 in)
2003
97.7 mm (3.8 in)
2004
145.0 mm (5.7 in)
2005
235.2 mm (9.3 in)
2006
246.1 mm (9.7 in)
2007
66.8 mm (2.6 in)
2008
131.0 mm (5.2 in)
2009
86.6 mm (3.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Vacaville, 1893 to 2009. The record is 191 days in 1903, marked on the chart; the median year is 115 days.
Longest dry spell (CDD) at Vacaville by year
Year
Longest dry spell (CDD)
1893
115 days
1894
26 days
1895
50 days
1896
59 days
1897
48 days
1898
37 days
1899
69 days
1900
52 days
1901
83 days
1902
134 days
1903
191 days
1904
114 days
1905
158 days
1906
99 days
1907
133 days
1908
148 days
1909
115 days
1910
157 days
1911
143 days
1912
102 days
1913
34 days
1914
68 days
1915
17 days
1916
17 days
1917
10 days
1918
5 days
1919
27 days
1920
20 days
1921
22 days
1922
24 days
1923
31 days
1924
62 days
1925
67 days
1926
147 days
1927
139 days
1928
174 days
1929
168 days
1930
143 days
1931
127 days
1932
154 days
1933
126 days
1934
108 days
1935
154 days
1936
144 days
1937
118 days
1938
149 days
1939
132 days
1940
97 days
1941
98 days
1942
105 days
1943
173 days
1944
151 days
1945
130 days
1946
112 days
1947
121 days
1948
102 days
1949
71 days
1950
137 days
1951
133 days
1952
124 days
1953
107 days
1954
119 days
1955
68 days
1956
170 days
1957
128 days
1958
81 days
1959
118 days
1960
162 days
1961
107 days
1962
165 days
1963
123 days
1964
140 days
1965
88 days
1966
52 days
1967
107 days
1968
97 days
1969
173 days
1970
87 days
1971
123 days
1972
108 days
1973
120 days
1974
111 days
1975
80 days
1976
115 days
1977
112 days
1978
131 days
1979
154 days
1980
48 days
1981
129 days
1982
154 days
1983
147 days
1984
132 days
1985
99 days
1986
61 days
1987
154 days
1988
64 days
1989
73 days
1990
56 days
1991
119 days
1992
112 days
1993
130 days
1994
136 days
1995
137 days
1996
160 days
1997
75 days
1998
63 days
1999
110 days
2000
123 days
2001
86 days
2002
169 days
2003
104 days
2004
112 days
2005
131 days
2006
135 days
2007
74 days
2008
163 days
2009
118 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
83 years with a frost
Across 83 years with a frost, the median last spring frost at Vacaville falls on 20 March and the median first autumn frost on 17 November, which leaves a median of 241 days between them.
In 1967 to 2008 the median growing season was 255 days. That is 38 days more than in 1905 to 1942.
Fitted over all years, the growing season changes by +7.8 days per decade at this station.
Frost dates and growing season at Vacaville
Measure
Median, all years
Earliest period (1905 to 1942)
Recent period (1967 to 2008)
Recent against earliest
Fitted trend
Last spring frost
20 March
4 April
11 March
24 days earlier
-3.9 days per decade
First autumn frost
17 November
3 November
28 November
25 days later
+3.9 days per decade
Growing days
241 days
217 days
255 days
38 days more
+7.8 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
87 years, 1897 to 2008
A day with at least 63.4 mm (2.5 in) of rain is expected about once in 2 years. A day with at least 174.6 mm (6.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Vacaville: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
63.4 mm (2.5 in)
5 years
91.0 mm (3.6 in)
10 years
110.1 mm (4.3 in)
25 years
135.2 mm (5.3 in)
50 years
154.6 mm (6.1 in)
100 years
174.6 mm (6.9 in)
Longer than the 87 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, 87 years of values from 1897 to 2008.
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: 154.9 mm (6.1 in) in 1940; 148.6 mm (5.9 in) in 1955; 138.4 mm (5.4 in) in 1967.
Station Changes
2 suspected
2 changes were suspected in the annual mean temperature of Vacaville, at 1967 and 1993. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1967 ran 0.4 C (0.6 F) lower than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1993 ran 0.7 C (1.2 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Vacaville, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1967
-0.4
-0.6
likely
5
1993
+0.7
+1.2
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 Vacaville standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Vacaville 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.