Record envelope, standing records and threshold days for Ukiah (USC00358726), Oregon, United States, with 98 years of record.
Key Facts for Ukiah
Ukiah (USC00358726) is a weather station in Oregon, United States at 45.14 latitude and -118.94 longitude, 1,017 m (3,336 ft) above sea level.
The station reports from 1922 to 2019, 98 years of record.
1,464 records set at Ukiah still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Ukiah set a daily record precipitation of 17.5 mm (0.7 in) on 9 October 2018.
About the Station
Location: Oregon, United States, 45.14 latitude, -118.94 longitude.
Elevation: 1,017 m (3,336 ft).
Period of record: 1922 to 2019, 98 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 Ukiah. 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 Ukiah, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
15.6 C (60.1 F)
-43.3 C (-45.9 F)
n/a
n/a
Feb
21.1 C (70.0 F)
-47.8 C (-54.0 F)
n/a
n/a
Mar
23.9 C (75.0 F)
-23.3 C (-9.9 F)
n/a
n/a
Apr
30.6 C (87.1 F)
-12.8 C (9.0 F)
n/a
n/a
May
33.9 C (93.0 F)
-11.1 C (12.0 F)
n/a
n/a
Jun
37.8 C (100.0 F)
-8.3 C (17.1 F)
n/a
n/a
Jul
41.1 C (106.0 F)
-6.1 C (21.0 F)
n/a
n/a
Aug
43.3 C (109.9 F)
-6.7 C (19.9 F)
n/a
n/a
Sep
40.0 C (104.0 F)
-13.3 C (8.1 F)
n/a
n/a
Oct
33.3 C (91.9 F)
-18.9 C (-2.0 F)
n/a
n/a
Nov
24.4 C (75.9 F)
-35.6 C (-32.1 F)
n/a
n/a
Dec
20.0 C (68.0 F)
-38.9 C (-38.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Ukiah still stand. 1933 holds the most, with 35.
Standing records at Ukiah by the year they were set
Year set
Standing records
1922
14
1923
18
1924
19
1925
11
1926
28
1927
21
1928
15
1929
33
1930
27
1931
21
1932
22
1933
35
1934
34
1935
17
1936
30
1937
31
1938
14
1939
31
1940
18
1941
21
1942
14
1943
20
1944
16
1945
15
1946
3
1948
6
1949
26
1950
31
1951
9
1952
16
1953
17
1954
25
1955
23
1956
21
1957
21
1958
14
1959
16
1960
29
1961
24
1962
16
1963
27
1964
17
1965
19
1966
21
1967
13
1968
32
1969
15
1970
22
1971
30
1972
34
1973
11
1974
22
1975
16
1976
16
1977
12
1978
16
1979
18
1980
15
1981
13
1982
8
1983
12
1984
8
1985
35
1986
13
1987
24
1988
17
1989
11
1990
15
1991
6
1992
2
1993
10
1994
8
1995
9
1996
20
1997
12
1998
7
1999
21
2000
11
2001
5
2007
9
2009
1
2010
9
All-Time Record Progression
3 new records
3 all-time records were set at Ukiah between 4 August 1961 and 24 December 1983. Each dot is a new record.
When Ukiah set new all-time records
Date
Kind
Detail
1961-08-04
Record high maximum temperature
Record high maximum temperature 43.3 C (109.9 F)
1979-02-04
Record snow depth
Record snow depth 55.9 cm (22.0 in)
1983-12-24
Record low maximum temperature
Record low maximum temperature -23.3 C (-9.9 F)
Wettest Day of Each Month
Jun: 73.7 mm (2.9 in)
The wettest day on record for each calendar month at Ukiah. The most was 73.7 mm (2.9 in) on 22 June 1938.
Record daily precipitation for each month at Ukiah
Month
Record daily precipitation (mm)
Date
Jan
29.7 mm (1.2 in)
31 January 1957
Feb
50.8 mm (2.0 in)
18 February 1949
Mar
30.2 mm (1.2 in)
18 March 1995
Apr
21.8 mm (0.9 in)
27 April 1962
May
38.9 mm (1.5 in)
10 May 1989
Jun
73.7 mm (2.9 in)
22 June 1938
Jul
57.9 mm (2.3 in)
10 July 1975
Aug
45.7 mm (1.8 in)
16 August 1993
Sep
27.4 mm (1.1 in)
26 September 1959
Oct
39.9 mm (1.6 in)
6 October 1999
Nov
51.1 mm (2.0 in)
28 November 1995
Dec
35.6 mm (1.4 in)
30 December 2002
Period of Record Coverage
1922 to 2011
Complete yearUnder 90 percent of days
86 years of record at Ukiah, 1922 to 2011. 27 years have data for under 90 percent of days and are left out of rankings: 1922, 1925, 1946, 1948, 1949, 1954, 1955, 1958 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 56 complete years at Ukiah, 1923 to 1997. Blue stripes are years cooler than the station's own mean of 6.3 C (43.4 F); red stripes are warmer. The coolest year was 1985, at 3.3 C (38.0 F), and the warmest was 1934, at 8.6 C (47.5 F). The strongest colour marks a difference of 3.0 C (5.4 F).
Annual mean temperature at Ukiah as warming stripes, 1923 to 1997
Year
Annual mean temperature
Difference from the station mean
1923
6.1 C
-0.26 C
1924
5.9 C
-0.44 C
1926
7.3 C
+0.93 C
1927
6.2 C
-0.14 C
1928
6.2 C
-0.15 C
1929
5.0 C
-1.30 C
1930
5.1 C
-1.18 C
1931
5.6 C
-0.69 C
1932
5.0 C
-1.30 C
1933
5.7 C
-0.63 C
1934
8.6 C
+2.28 C
1935
5.2 C
-1.09 C
1936
5.9 C
-0.45 C
1937
5.6 C
-0.73 C
1938
7.4 C
+1.03 C
1939
7.2 C
+0.92 C
1940
7.4 C
+1.03 C
1941
7.7 C
+1.34 C
1942
5.4 C
-0.92 C
1943
5.6 C
-0.76 C
1944
6.2 C
-0.12 C
1945
6.2 C
-0.08 C
1950
6.4 C
+0.12 C
1951
6.2 C
-0.17 C
1952
6.0 C
-0.32 C
1953
7.3 C
+1.02 C
1960
5.8 C
-0.53 C
1961
7.0 C
+0.69 C
1962
6.8 C
+0.43 C
1963
7.2 C
+0.88 C
1965
7.5 C
+1.14 C
1966
7.3 C
+1.01 C
1967
7.3 C
+0.95 C
1968
6.8 C
+0.52 C
1969
6.1 C
-0.21 C
1970
6.1 C
-0.26 C
1971
5.9 C
-0.43 C
1972
5.9 C
-0.47 C
1973
6.5 C
+0.15 C
1974
6.3 C
-0.03 C
1975
5.8 C
-0.51 C
1976
6.0 C
-0.34 C
1977
6.4 C
+0.03 C
1978
6.1 C
-0.24 C
1979
6.1 C
-0.18 C
1980
6.6 C
+0.28 C
1981
7.0 C
+0.64 C
1984
5.3 C
-1.05 C
1985
3.3 C
-2.98 C
1986
7.2 C
+0.83 C
1988
6.6 C
+0.27 C
1989
5.6 C
-0.77 C
1990
6.3 C
-0.07 C
1994
6.7 C
+0.38 C
1995
7.2 C
+0.83 C
1997
7.4 C
+1.05 C
The fitted trend in annual mean temperature here over 1923 to 1997 is 0.03 C (-0.07 to 0.14) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.1 to 0.3) per decade. The slope is a straight line fitted to 56 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Ukiah
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.03 C (-0.07 to 0.14) per decade
0.1 F (-0.1 to 0.3) per decade
1923 to 1997
56
Not clearly different from zero
Mean daily maximum
0.02 C (-0.09 to 0.13) per decade
0.03 F (-0.17 to 0.23) per decade
1923 to 1997
56
Not clearly different from zero
Mean daily minimum
0.05 C (-0.08 to 0.17) per decade
0.1 F (-0.1 to 0.3) per decade
1923 to 1997
56
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
1922 to 2019
Yearly extremes at Ukiah: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
43.3 C (109.9 F)
1961
36.7 C (98.1 F)
86
Coldest night (TNn)
-47.8 C (-54.0 F)
1933
-28.9 C (-20.0 F)
86
Wettest day (Rx1day)
73.7 mm (2.9 in)
1938
23.0 mm (0.9 in)
88
Wettest five days (Rx5day)
94.7 mm (3.7 in)
1994
40.1 mm (1.6 in)
87
Longest dry spell (CDD)
89 days
1974
39 days
88
Hottest day (TXx)
The hottest day of the year at Ukiah, 1922 to 2019. The record is 43.3 C (109.9 F) in 1961, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Ukiah by year
Year
Hottest day (TXx)
1922
37.8 C (100.0 F)
1923
34.4 C (93.9 F)
1924
37.8 C (100.0 F)
1925
36.1 C (97.0 F)
1926
37.2 C (99.0 F)
1927
36.7 C (98.1 F)
1928
41.1 C (106.0 F)
1929
37.8 C (100.0 F)
1930
37.8 C (100.0 F)
1931
40.0 C (104.0 F)
1932
36.7 C (98.1 F)
1933
36.1 C (97.0 F)
1934
40.6 C (105.1 F)
1935
40.0 C (104.0 F)
1936
37.2 C (99.0 F)
1937
37.2 C (99.0 F)
1938
38.3 C (100.9 F)
1939
40.6 C (105.1 F)
1940
37.2 C (99.0 F)
1941
35.6 C (96.1 F)
1942
38.3 C (100.9 F)
1943
36.1 C (97.0 F)
1944
36.7 C (98.1 F)
1945
35.6 C (96.1 F)
1946
27.8 C (82.0 F)
1948
33.3 C (91.9 F)
1949
35.6 C (96.1 F)
1950
40.0 C (104.0 F)
1951
36.1 C (97.0 F)
1952
37.2 C (99.0 F)
1953
36.1 C (97.0 F)
1954
35.6 C (96.1 F)
1955
37.8 C (100.0 F)
1956
37.2 C (99.0 F)
1957
33.9 C (93.0 F)
1958
33.9 C (93.0 F)
1959
39.4 C (102.9 F)
1960
38.3 C (100.9 F)
1961
43.3 C (109.9 F)
1962
35.6 C (96.1 F)
1963
36.7 C (98.1 F)
1964
35.6 C (96.1 F)
1965
35.0 C (95.0 F)
1966
36.1 C (97.0 F)
1967
38.3 C (100.9 F)
1968
37.8 C (100.0 F)
1969
37.8 C (100.0 F)
1970
36.7 C (98.1 F)
1971
38.3 C (100.9 F)
1972
38.9 C (102.0 F)
1973
35.6 C (96.1 F)
1974
35.6 C (96.1 F)
1975
38.3 C (100.9 F)
1976
33.9 C (93.0 F)
1977
37.2 C (99.0 F)
1978
37.8 C (100.0 F)
1979
37.2 C (99.0 F)
1980
36.1 C (97.0 F)
1981
37.8 C (100.0 F)
1982
37.2 C (99.0 F)
1983
35.6 C (96.1 F)
1984
37.2 C (99.0 F)
1985
36.1 C (97.0 F)
1986
36.1 C (97.0 F)
1987
36.7 C (98.1 F)
1988
38.9 C (102.0 F)
1989
33.9 C (93.0 F)
1990
37.8 C (100.0 F)
1991
33.3 C (91.9 F)
1992
33.9 C (93.0 F)
1993
32.8 C (91.0 F)
1994
37.2 C (99.0 F)
1995
35.0 C (95.0 F)
1996
37.8 C (100.0 F)
1997
35.0 C (95.0 F)
1998
37.8 C (100.0 F)
1999
35.6 C (96.1 F)
2000
37.2 C (99.0 F)
2001
32.8 C (91.0 F)
2002
17.8 C (64.0 F)
2006
12.2 C (54.0 F)
2007
37.2 C (99.0 F)
2008
37.2 C (99.0 F)
2009
31.1 C (88.0 F)
2010
35.0 C (95.0 F)
2011
6.7 C (44.1 F)
2018
n/a
2019
n/a
Coldest night (TNn)
The coldest night of the year at Ukiah, 1922 to 2019. The record is -47.8 C (-54.0 F) in 1933, marked on the chart; the median year is -28.9 C (-20.0 F).
Coldest night (TNn) at Ukiah by year
Year
Coldest night (TNn)
1922
-32.8 C (-27.0 F)
1923
-29.4 C (-20.9 F)
1924
-32.2 C (-26.0 F)
1925
-15.0 C (5.0 F)
1926
-32.2 C (-26.0 F)
1927
-43.3 C (-45.9 F)
1928
-22.2 C (-8.0 F)
1929
-38.9 C (-38.0 F)
1930
-42.8 C (-45.0 F)
1931
-31.1 C (-24.0 F)
1932
-34.4 C (-29.9 F)
1933
-47.8 C (-54.0 F)
1934
-14.4 C (6.1 F)
1935
-31.7 C (-25.1 F)
1936
-31.1 C (-24.0 F)
1937
-41.1 C (-42.0 F)
1938
-20.6 C (-5.1 F)
1939
-33.9 C (-29.0 F)
1940
-23.3 C (-9.9 F)
1941
-18.9 C (-2.0 F)
1942
-32.2 C (-26.0 F)
1943
-36.1 C (-33.0 F)
1944
-20.6 C (-5.1 F)
1945
-27.8 C (-18.0 F)
1946
-24.4 C (-11.9 F)
1948
-30.0 C (-22.0 F)
1949
-37.2 C (-35.0 F)
1950
-40.6 C (-41.1 F)
1951
-27.2 C (-17.0 F)
1952
-27.8 C (-18.0 F)
1953
-17.2 C (1.0 F)
1954
-26.1 C (-15.0 F)
1955
-28.9 C (-20.0 F)
1956
-35.0 C (-31.0 F)
1957
-40.6 C (-41.1 F)
1958
-25.0 C (-13.0 F)
1959
-30.0 C (-22.0 F)
1960
-32.2 C (-26.0 F)
1961
-32.8 C (-27.0 F)
1962
-35.0 C (-31.0 F)
1963
-32.2 C (-26.0 F)
1964
-33.3 C (-27.9 F)
1965
-25.6 C (-14.1 F)
1966
-17.8 C (0.0 F)
1967
-26.1 C (-15.0 F)
1968
-25.6 C (-14.1 F)
1969
-30.0 C (-22.0 F)
1970
-25.6 C (-14.1 F)
1971
-25.0 C (-13.0 F)
1972
-34.4 C (-29.9 F)
1973
-30.6 C (-23.1 F)
1974
-32.8 C (-27.0 F)
1975
-25.0 C (-13.0 F)
1976
-24.4 C (-11.9 F)
1977
-28.9 C (-20.0 F)
1978
-35.6 C (-32.1 F)
1979
-35.6 C (-32.1 F)
1980
-26.1 C (-15.0 F)
1981
-20.0 C (-4.0 F)
1982
-31.7 C (-25.1 F)
1983
-38.9 C (-38.0 F)
1984
-28.9 C (-20.0 F)
1985
-37.8 C (-36.0 F)
1986
-18.9 C (-2.0 F)
1987
-31.1 C (-24.0 F)
1988
-27.8 C (-18.0 F)
1989
-37.2 C (-35.0 F)
1990
-38.9 C (-38.0 F)
1991
-26.1 C (-15.0 F)
1992
-10.6 C (12.9 F)
1993
-30.0 C (-22.0 F)
1994
-29.4 C (-20.9 F)
1995
-18.9 C (-2.0 F)
1996
-35.0 C (-31.0 F)
1997
-17.2 C (1.0 F)
1998
-27.8 C (-18.0 F)
1999
-18.3 C (-0.9 F)
2000
-17.2 C (1.0 F)
2001
-17.8 C (0.0 F)
2002
-17.2 C (1.0 F)
2006
-15.0 C (5.0 F)
2007
-25.6 C (-14.1 F)
2008
-2.2 C (28.0 F)
2009
-6.1 C (21.0 F)
2010
-18.9 C (-2.0 F)
2011
-22.8 C (-9.0 F)
2018
n/a
2019
n/a
Wettest day (Rx1day)
The wettest day of the year at Ukiah, 1922 to 2019. The record is 73.7 mm (2.9 in) in 1938, marked on the chart; the median year is 23.0 mm (0.9 in).
Wettest day (Rx1day) at Ukiah by year
Year
Wettest day (Rx1day)
1922
24.9 mm (1.0 in)
1923
32.5 mm (1.3 in)
1924
24.1 mm (0.9 in)
1925
30.7 mm (1.2 in)
1926
22.9 mm (0.9 in)
1927
32.0 mm (1.3 in)
1928
17.8 mm (0.7 in)
1929
23.4 mm (0.9 in)
1930
23.9 mm (0.9 in)
1931
15.2 mm (0.6 in)
1932
13.5 mm (0.5 in)
1933
19.1 mm (0.8 in)
1934
22.4 mm (0.9 in)
1935
17.0 mm (0.7 in)
1936
26.7 mm (1.1 in)
1937
31.8 mm (1.3 in)
1938
73.7 mm (2.9 in)
1939
16.3 mm (0.6 in)
1940
22.4 mm (0.9 in)
1941
21.8 mm (0.9 in)
1942
21.1 mm (0.8 in)
1943
17.0 mm (0.7 in)
1944
15.2 mm (0.6 in)
1945
23.1 mm (0.9 in)
1946
17.5 mm (0.7 in)
1948
18.0 mm (0.7 in)
1949
50.8 mm (2.0 in)
1950
31.5 mm (1.2 in)
1951
21.6 mm (0.9 in)
1952
31.0 mm (1.2 in)
1953
28.7 mm (1.1 in)
1954
32.5 mm (1.3 in)
1955
22.9 mm (0.9 in)
1956
26.2 mm (1.0 in)
1957
29.7 mm (1.2 in)
1958
29.7 mm (1.2 in)
1959
27.4 mm (1.1 in)
1960
18.8 mm (0.7 in)
1961
16.0 mm (0.6 in)
1962
23.9 mm (0.9 in)
1963
19.8 mm (0.8 in)
1964
27.9 mm (1.1 in)
1965
30.5 mm (1.2 in)
1966
19.3 mm (0.8 in)
1967
13.2 mm (0.5 in)
1968
29.5 mm (1.2 in)
1969
25.4 mm (1.0 in)
1970
22.9 mm (0.9 in)
1971
16.0 mm (0.6 in)
1972
36.8 mm (1.4 in)
1973
21.1 mm (0.8 in)
1974
15.2 mm (0.6 in)
1975
57.9 mm (2.3 in)
1976
21.8 mm (0.9 in)
1977
17.3 mm (0.7 in)
1978
24.9 mm (1.0 in)
1979
25.4 mm (1.0 in)
1980
18.5 mm (0.7 in)
1981
26.9 mm (1.1 in)
1982
20.8 mm (0.8 in)
1983
28.4 mm (1.1 in)
1984
26.2 mm (1.0 in)
1985
15.2 mm (0.6 in)
1986
29.2 mm (1.1 in)
1987
15.5 mm (0.6 in)
1988
18.0 mm (0.7 in)
1989
38.9 mm (1.5 in)
1990
25.4 mm (1.0 in)
1991
29.5 mm (1.2 in)
1992
14.0 mm (0.6 in)
1993
45.7 mm (1.8 in)
1994
37.8 mm (1.5 in)
1995
51.1 mm (2.0 in)
1996
37.6 mm (1.5 in)
1997
20.6 mm (0.8 in)
1998
18.3 mm (0.7 in)
1999
39.9 mm (1.6 in)
2000
18.3 mm (0.7 in)
2001
17.8 mm (0.7 in)
2002
35.6 mm (1.4 in)
2006
15.2 mm (0.6 in)
2007
14.0 mm (0.6 in)
2008
13.2 mm (0.5 in)
2009
22.9 mm (0.9 in)
2010
32.8 mm (1.3 in)
2011
0.0 mm (0.00 in)
2018
41.1 mm (1.6 in)
2019
15.5 mm (0.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Ukiah, 1922 to 2019. The record is 94.7 mm (3.7 in) in 1994, marked on the chart; the median year is 40.1 mm (1.6 in).
Wettest five days (Rx5day) at Ukiah by year
Year
Wettest five days (Rx5day)
1922
33.8 mm (1.3 in)
1923
52.1 mm (2.1 in)
1924
46.5 mm (1.8 in)
1925
31.2 mm (1.2 in)
1926
42.9 mm (1.7 in)
1927
34.5 mm (1.4 in)
1928
26.1 mm (1.0 in)
1929
58.9 mm (2.3 in)
1930
31.0 mm (1.2 in)
1931
46.3 mm (1.8 in)
1932
31.2 mm (1.2 in)
1933
37.9 mm (1.5 in)
1934
59.8 mm (2.4 in)
1935
30.2 mm (1.2 in)
1936
46.3 mm (1.8 in)
1937
54.1 mm (2.1 in)
1938
86.1 mm (3.4 in)
1939
53.8 mm (2.1 in)
1940
33.6 mm (1.3 in)
1941
43.3 mm (1.7 in)
1942
43.4 mm (1.7 in)
1943
37.8 mm (1.5 in)
1944
25.6 mm (1.0 in)
1945
48.7 mm (1.9 in)
1946
39.7 mm (1.6 in)
1948
28.8 mm (1.1 in)
1949
68.8 mm (2.7 in)
1950
61.0 mm (2.4 in)
1951
28.2 mm (1.1 in)
1952
50.1 mm (2.0 in)
1953
60.8 mm (2.4 in)
1954
43.4 mm (1.7 in)
1955
42.2 mm (1.7 in)
1956
54.4 mm (2.1 in)
1957
50.0 mm (2.0 in)
1958
37.3 mm (1.5 in)
1959
35.1 mm (1.4 in)
1960
40.9 mm (1.6 in)
1961
47.3 mm (1.9 in)
1962
56.2 mm (2.2 in)
1963
48.1 mm (1.9 in)
1964
81.1 mm (3.2 in)
1965
55.4 mm (2.2 in)
1966
37.3 mm (1.5 in)
1967
26.9 mm (1.1 in)
1968
37.8 mm (1.5 in)
1969
40.4 mm (1.6 in)
1970
51.3 mm (2.0 in)
1971
32.3 mm (1.3 in)
1972
38.3 mm (1.5 in)
1973
51.7 mm (2.0 in)
1974
40.1 mm (1.6 in)
1975
65.0 mm (2.6 in)
1976
44.0 mm (1.7 in)
1977
37.6 mm (1.5 in)
1978
35.4 mm (1.4 in)
1979
40.9 mm (1.6 in)
1980
39.3 mm (1.5 in)
1981
38.8 mm (1.5 in)
1982
28.6 mm (1.1 in)
1983
35.0 mm (1.4 in)
1984
27.3 mm (1.1 in)
1985
30.7 mm (1.2 in)
1986
36.4 mm (1.4 in)
1987
30.9 mm (1.2 in)
1988
35.2 mm (1.4 in)
1989
55.4 mm (2.2 in)
1990
30.9 mm (1.2 in)
1991
55.7 mm (2.2 in)
1992
36.2 mm (1.4 in)
1993
55.9 mm (2.2 in)
1994
94.7 mm (3.7 in)
1995
57.7 mm (2.3 in)
1996
54.1 mm (2.1 in)
1997
49.9 mm (2.0 in)
1998
37.3 mm (1.5 in)
1999
43.2 mm (1.7 in)
2000
34.6 mm (1.4 in)
2001
26.2 mm (1.0 in)
2002
12.4 mm (0.5 in)
2006
26.1 mm (1.0 in)
2007
38.1 mm (1.5 in)
2008
13.2 mm (0.5 in)
2009
31.8 mm (1.3 in)
2010
40.2 mm (1.6 in)
2011
n/a
2018
43.6 mm (1.7 in)
2019
35.7 mm (1.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Ukiah, 1922 to 2019. The record is 89 days in 1974, marked on the chart; the median year is 39 days.
Longest dry spell (CDD) at Ukiah by year
Year
Longest dry spell (CDD)
1922
54 days
1923
35 days
1924
52 days
1925
32 days
1926
35 days
1927
39 days
1928
31 days
1929
67 days
1930
36 days
1931
70 days
1932
44 days
1933
35 days
1934
50 days
1935
41 days
1936
29 days
1937
34 days
1938
36 days
1939
57 days
1940
44 days
1941
16 days
1942
41 days
1943
56 days
1944
42 days
1945
24 days
1946
18 days
1948
28 days
1949
36 days
1950
36 days
1951
53 days
1952
63 days
1953
50 days
1954
42 days
1955
42 days
1956
30 days
1957
43 days
1958
24 days
1959
43 days
1960
43 days
1961
41 days
1962
59 days
1963
24 days
1964
17 days
1965
32 days
1966
45 days
1967
79 days
1968
25 days
1969
68 days
1970
48 days
1971
28 days
1972
49 days
1973
35 days
1974
89 days
1975
39 days
1976
35 days
1977
38 days
1978
41 days
1979
56 days
1980
53 days
1981
81 days
1982
19 days
1983
23 days
1984
32 days
1985
54 days
1986
62 days
1987
34 days
1988
44 days
1989
24 days
1990
39 days
1991
13 days
1992
22 days
1993
74 days
1994
29 days
1995
31 days
1996
48 days
1997
18 days
1998
34 days
1999
50 days
2000
26 days
2001
40 days
2002
9 days
2006
6 days
2007
30 days
2008
13 days
2009
78 days
2010
25 days
2011
4 days
2018
49 days
2019
11 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
56 years with a frost
Across 56 years with a frost, the median last spring frost at Ukiah falls on 26 June and the median first autumn frost on 6 July, which leaves a median of 11 days between them.
Fitted over all years, the growing season changes by -0.4 days per decade at this station.
Frost dates and growing season at Ukiah
Measure
Median, all years
Earliest period
Recent period (1960 to 1997)
Recent against earliest
Fitted trend
Last spring frost
26 June
n/a
27 June
n/a
0.0 days per decade
First autumn frost
6 July
n/a
6 July
n/a
-0.5 days per decade
Growing days
11 days
n/a
10 days
n/a
-0.4 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
64 years, 1923 to 2018
A day with at least 22.7 mm (0.9 in) of rain is expected about once in 2 years. A day with at least 66.2 mm (2.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Ukiah: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
22.7 mm (0.9 in)
5 years
30.9 mm (1.2 in)
10 years
37.5 mm (1.5 in)
25 years
47.4 mm (1.9 in)
50 years
56.2 mm (2.2 in)
100 years
66.2 mm (2.6 in)
Longer than the 64 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, 64 years of values from 1923 to 2018.
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: 73.7 mm (2.9 in) in 1938; 57.9 mm (2.3 in) in 1975; 51.1 mm (2.0 in) in 1995.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Ukiah standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Ukiah 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.