Record envelope, standing records and threshold days for Pomona/Fairplex (USC00047050), California, United States, with 120 years of record.
Key Facts for Pomona/Fairplex
Pomona/Fairplex (USC00047050) is a weather station in California, United States at 34.08 latitude and -117.77 longitude, 305 m (999 ft) above sea level.
The station reports from 1893 to 2012, 120 years of record.
1,464 records set at Pomona/Fairplex still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Pomona/Fairplex set a daily record high minimum temperature of 20.0 C (68.0 F) on 16 September 2012.
About the Station
Location: California, United States, 34.08 latitude, -117.77 longitude.
Elevation: 305 m (999 ft).
Period of record: 1893 to 2012, 120 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 Pomona/Fairplex. 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 Pomona/Fairplex, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
32.8 C (91.0 F)
-6.1 C (21.0 F)
n/a
n/a
Feb
34.4 C (93.9 F)
-5.6 C (21.9 F)
n/a
n/a
Mar
37.8 C (100.0 F)
-3.3 C (26.1 F)
n/a
n/a
Apr
40.0 C (104.0 F)
-1.7 C (28.9 F)
n/a
n/a
May
41.1 C (106.0 F)
-0.6 C (30.9 F)
n/a
n/a
Jun
47.2 C (117.0 F)
3.3 C (37.9 F)
n/a
n/a
Jul
45.0 C (113.0 F)
5.0 C (41.0 F)
n/a
n/a
Aug
43.3 C (109.9 F)
5.6 C (42.1 F)
n/a
n/a
Sep
45.0 C (113.0 F)
3.3 C (37.9 F)
n/a
n/a
Oct
41.7 C (107.1 F)
-1.7 C (28.9 F)
n/a
n/a
Nov
36.1 C (97.0 F)
-4.4 C (24.1 F)
n/a
n/a
Dec
33.9 C (93.0 F)
-5.6 C (21.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Pomona/Fairplex still stand. 1949 holds the most, with 35.
Standing records at Pomona/Fairplex by the year they were set
Year set
Standing records
1893
2
1894
16
1895
13
1896
12
1897
11
1898
23
1899
8
1900
14
1901
14
1902
7
1913
21
1914
20
1915
7
1916
29
1917
20
1918
22
1919
34
1920
25
1921
23
1922
21
1923
16
1924
25
1925
16
1926
14
1927
11
1928
15
1929
12
1930
17
1931
21
1932
14
1933
22
1934
13
1935
15
1936
6
1937
22
1938
15
1939
12
1940
11
1941
13
1942
10
1943
12
1944
15
1945
13
1946
10
1947
14
1948
31
1949
35
1950
21
1951
12
1952
8
1953
16
1954
11
1955
13
1956
14
1957
9
1958
9
1959
11
1960
3
1961
7
1962
6
1963
10
1964
9
1965
16
1966
13
1967
11
1968
10
1969
10
1970
2
1971
22
1972
11
1973
6
1974
6
1975
11
1976
10
1977
12
1978
7
1979
11
1980
14
1981
11
1982
9
1983
17
1984
10
1985
14
1986
17
1987
19
1988
26
1989
12
1990
12
1991
20
1992
15
1993
10
1994
3
1995
14
2001
12
2002
1
2003
20
2004
13
2005
8
2006
20
2007
8
2008
15
2009
11
2010
16
2011
13
2012
15
All-Time Record Progression
2 new records
2 all-time records were set at Pomona/Fairplex between 21 January 1937 and 13 September 1971. Each dot is a new record.
When Pomona/Fairplex set new all-time records
Date
Kind
Detail
1937-01-21
Record low maximum temperature
Record low maximum temperature 2.2 C (36.0 F)
1971-09-13
Record high minimum temperature
Record high minimum temperature 25.6 C (78.1 F)
Wettest Day of Each Month
Jan: 215.9 mm (8.5 in)
The wettest day on record for each calendar month at Pomona/Fairplex. The most was 215.9 mm (8.5 in) on 1 January 1934.
Record daily precipitation for each month at Pomona/Fairplex
Month
Record daily precipitation (mm)
Date
Jan
215.9 mm (8.5 in)
1 January 1934
Feb
142.2 mm (5.6 in)
19 February 1914
Mar
106.9 mm (4.2 in)
3 March 1938
Apr
97.8 mm (3.9 in)
6 April 1926
May
34.0 mm (1.3 in)
8 May 1977
Jun
34.0 mm (1.3 in)
6 June 1925
Jul
11.2 mm (0.4 in)
30 July 1965
Aug
31.0 mm (1.2 in)
18 August 1977
Sep
66.0 mm (2.6 in)
25 September 1939
Oct
96.5 mm (3.8 in)
18 October 1934
Nov
145.0 mm (5.7 in)
26 November 2008
Dec
103.4 mm (4.1 in)
30 December 1951
Period of Record Coverage
1893 to 2012
Complete yearUnder 90 percent of days
105 years of record at Pomona/Fairplex, 1893 to 2012. 23 years have data for under 90 percent of days and are left out of rankings: 1893, 1895, 1982, 1983, 1984, 1985, 1986, 1987 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 83 complete years at Pomona/Fairplex, 1896 to 2011. Blue stripes are years cooler than the station's own mean of 16.9 C (62.4 F); red stripes are warmer. The coolest year was 1944, at 15.2 C (59.4 F), and the warmest was 2003, at 19.0 C (66.1 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Pomona/Fairplex as warming stripes, 1896 to 2011
Year
Annual mean temperature
Difference from the station mean
1896
17.5 C
+0.58 C
1897
16.6 C
-0.32 C
1899
17.2 C
+0.32 C
1900
17.2 C
+0.28 C
1901
17.5 C
+0.61 C
1902
16.8 C
-0.05 C
1913
16.2 C
-0.72 C
1914
16.2 C
-0.70 C
1915
16.0 C
-0.86 C
1916
15.6 C
-1.25 C
1917
16.2 C
-0.70 C
1918
16.5 C
-0.35 C
1919
15.7 C
-1.18 C
1920
15.5 C
-1.40 C
1921
16.2 C
-0.70 C
1922
15.8 C
-1.05 C
1923
16.1 C
-0.76 C
1924
15.9 C
-0.94 C
1925
16.0 C
-0.83 C
1926
16.8 C
-0.11 C
1927
16.0 C
-0.90 C
1928
15.9 C
-0.93 C
1929
16.1 C
-0.78 C
1930
15.7 C
-1.16 C
1931
16.9 C
0.00 C
1932
15.7 C
-1.19 C
1933
15.5 C
-1.38 C
1934
16.9 C
+0.04 C
1935
15.8 C
-1.05 C
1936
16.7 C
-0.18 C
1937
16.3 C
-0.53 C
1938
16.6 C
-0.25 C
1939
16.8 C
-0.05 C
1940
17.3 C
+0.38 C
1941
16.4 C
-0.50 C
1943
16.7 C
-0.18 C
1944
15.2 C
-1.63 C
1945
15.7 C
-1.16 C
1946
15.6 C
-1.23 C
1949
15.8 C
-1.03 C
1952
15.7 C
-1.16 C
1953
16.2 C
-0.72 C
1954
16.6 C
-0.25 C
1955
16.2 C
-0.63 C
1956
16.8 C
-0.10 C
1957
17.0 C
+0.15 C
1958
17.6 C
+0.69 C
1959
18.0 C
+1.16 C
1960
17.3 C
+0.38 C
1961
17.3 C
+0.38 C
1962
16.5 C
-0.37 C
1963
16.9 C
+0.02 C
1964
16.7 C
-0.21 C
1965
17.1 C
+0.23 C
1966
18.1 C
+1.20 C
1967
17.9 C
+1.04 C
1968
17.9 C
+1.00 C
1970
17.0 C
+0.15 C
1971
16.7 C
-0.16 C
1972
17.3 C
+0.44 C
1973
16.4 C
-0.43 C
1974
17.2 C
+0.28 C
1975
16.2 C
-0.64 C
1976
17.8 C
+0.89 C
1977
17.7 C
+0.86 C
1978
17.7 C
+0.85 C
1979
17.7 C
+0.86 C
1980
18.1 C
+1.26 C
1981
18.6 C
+1.73 C
1982
17.5 C
+0.61 C
1983
18.1 C
+1.21 C
1984
18.7 C
+1.83 C
1985
17.7 C
+0.86 C
1986
18.0 C
+1.09 C
1987
17.3 C
+0.40 C
1988
18.2 C
+1.35 C
1989
17.9 C
+1.03 C
1990
18.2 C
+1.31 C
1991
18.2 C
+1.28 C
1992
16.6 C
-0.27 C
1993
18.2 C
+1.36 C
2003
19.0 C
+2.08 C
2011
17.8 C
+0.90 C
The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1896 to 2011. In Fahrenheit: 0.4 F (0.3 to 0.5) per decade. The slope is a straight line fitted to 83 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Pomona/Fairplex
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.2 C (0.1 to 0.3) per decade
0.4 F (0.3 to 0.5) per decade
1896 to 2011
83
Rise
Mean daily maximum
0.04 C (-0.02 to 0.10) per decade
0.07 F (-0.04 to 0.17) per decade
1896 to 2011
83
Not clearly different from zero
Mean daily minimum
0.4 C (0.3 to 0.4) per decade
0.6 F (0.5 to 0.8) per decade
1896 to 2011
83
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 2012
Yearly extremes at Pomona/Fairplex: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
47.2 C (117.0 F)
1917
41.1 C (106.0 F)
105
Coldest night (TNn)
-6.1 C (21.0 F)
1913
-2.8 C (27.0 F)
105
Wettest day (Rx1day)
215.9 mm (8.5 in)
1934
56.9 mm (2.2 in)
108
Wettest five days (Rx5day)
291.3 mm (11.5 in)
1980
100.9 mm (4.0 in)
108
Longest dry spell (CDD)
278 days
2002
122 days
108
Hottest day (TXx)
The hottest day of the year at Pomona/Fairplex, 1893 to 2012. The record is 47.2 C (117.0 F) in 1917, marked on the chart; the median year is 41.1 C (106.0 F).
Hottest day (TXx) at Pomona/Fairplex by year
Year
Hottest day (TXx)
1893
21.1 C (70.0 F)
1894
43.3 C (109.9 F)
1895
41.1 C (106.0 F)
1896
43.3 C (109.9 F)
1897
40.0 C (104.0 F)
1898
42.2 C (108.0 F)
1899
41.1 C (106.0 F)
1900
41.7 C (107.1 F)
1901
42.8 C (109.0 F)
1902
44.4 C (111.9 F)
1906
n/a
1907
n/a
1908
n/a
1913
42.8 C (109.0 F)
1914
38.3 C (100.9 F)
1915
40.0 C (104.0 F)
1916
40.6 C (105.1 F)
1917
47.2 C (117.0 F)
1918
43.3 C (109.9 F)
1919
41.1 C (106.0 F)
1920
39.4 C (102.9 F)
1921
41.7 C (107.1 F)
1922
43.3 C (109.9 F)
1923
39.4 C (102.9 F)
1924
38.9 C (102.0 F)
1925
43.3 C (109.9 F)
1926
42.8 C (109.0 F)
1927
41.7 C (107.1 F)
1928
38.9 C (102.0 F)
1929
42.2 C (108.0 F)
1930
41.7 C (107.1 F)
1931
41.1 C (106.0 F)
1932
41.1 C (106.0 F)
1933
41.7 C (107.1 F)
1934
44.4 C (111.9 F)
1935
40.6 C (105.1 F)
1936
42.8 C (109.0 F)
1937
41.1 C (106.0 F)
1938
42.2 C (108.0 F)
1939
42.2 C (108.0 F)
1940
40.0 C (104.0 F)
1941
38.3 C (100.9 F)
1942
40.6 C (105.1 F)
1943
42.2 C (108.0 F)
1944
42.2 C (108.0 F)
1945
39.4 C (102.9 F)
1946
40.0 C (104.0 F)
1947
42.2 C (108.0 F)
1948
45.0 C (113.0 F)
1949
43.3 C (109.9 F)
1950
41.7 C (107.1 F)
1951
40.6 C (105.1 F)
1952
39.4 C (102.9 F)
1953
40.0 C (104.0 F)
1954
39.4 C (102.9 F)
1955
44.4 C (111.9 F)
1956
41.7 C (107.1 F)
1957
42.2 C (108.0 F)
1958
40.0 C (104.0 F)
1959
41.7 C (107.1 F)
1960
41.1 C (106.0 F)
1961
39.4 C (102.9 F)
1962
38.3 C (100.9 F)
1963
42.2 C (108.0 F)
1964
39.4 C (102.9 F)
1965
40.0 C (104.0 F)
1966
39.4 C (102.9 F)
1967
42.8 C (109.0 F)
1968
40.6 C (105.1 F)
1969
41.7 C (107.1 F)
1970
38.9 C (102.0 F)
1971
41.7 C (107.1 F)
1972
40.6 C (105.1 F)
1973
40.6 C (105.1 F)
1974
38.9 C (102.0 F)
1975
39.4 C (102.9 F)
1976
40.6 C (105.1 F)
1977
38.3 C (100.9 F)
1978
42.8 C (109.0 F)
1979
41.1 C (106.0 F)
1980
40.0 C (104.0 F)
1981
41.1 C (106.0 F)
1982
42.8 C (109.0 F)
1983
41.1 C (106.0 F)
1984
43.3 C (109.9 F)
1985
41.1 C (106.0 F)
1986
38.9 C (102.0 F)
1987
42.8 C (109.0 F)
1988
42.2 C (108.0 F)
1989
42.8 C (109.0 F)
1990
39.4 C (102.9 F)
1991
38.9 C (102.0 F)
1992
37.2 C (99.0 F)
1993
39.4 C (102.9 F)
1994
35.6 C (96.1 F)
1995
34.4 C (93.9 F)
2001
36.7 C (98.1 F)
2002
43.3 C (109.9 F)
2003
40.6 C (105.1 F)
2004
40.0 C (104.0 F)
2005
40.0 C (104.0 F)
2006
45.0 C (113.0 F)
2007
42.8 C (109.0 F)
2008
42.2 C (108.0 F)
2009
41.7 C (107.1 F)
2010
43.9 C (111.0 F)
2011
40.6 C (105.1 F)
2012
40.6 C (105.1 F)
Coldest night (TNn)
The coldest night of the year at Pomona/Fairplex, 1893 to 2012. The record is -6.1 C (21.0 F) in 1913, marked on the chart; the median year is -2.8 C (27.0 F).
Coldest night (TNn) at Pomona/Fairplex by year
Year
Coldest night (TNn)
1893
0.0 C (32.0 F)
1894
-4.4 C (24.1 F)
1895
-2.2 C (28.0 F)
1896
-1.7 C (28.9 F)
1897
-3.3 C (26.1 F)
1898
-3.3 C (26.1 F)
1899
-5.6 C (21.9 F)
1900
-2.8 C (27.0 F)
1901
-5.0 C (23.0 F)
1902
-2.2 C (28.0 F)
1906
n/a
1907
n/a
1908
n/a
1913
-6.1 C (21.0 F)
1914
-2.8 C (27.0 F)
1915
-2.8 C (27.0 F)
1916
-3.3 C (26.1 F)
1917
-3.3 C (26.1 F)
1918
-4.4 C (24.1 F)
1919
-4.4 C (24.1 F)
1920
-3.9 C (25.0 F)
1921
-3.9 C (25.0 F)
1922
-5.0 C (23.0 F)
1923
-2.8 C (27.0 F)
1924
-3.9 C (25.0 F)
1925
-2.8 C (27.0 F)
1926
-2.8 C (27.0 F)
1927
-2.8 C (27.0 F)
1928
-2.8 C (27.0 F)
1929
-2.8 C (27.0 F)
1930
-3.3 C (26.1 F)
1931
-3.3 C (26.1 F)
1932
-2.8 C (27.0 F)
1933
-2.8 C (27.0 F)
1934
-2.8 C (27.0 F)
1935
-3.3 C (26.1 F)
1936
-3.3 C (26.1 F)
1937
-5.0 C (23.0 F)
1938
-4.4 C (24.1 F)
1939
-3.3 C (26.1 F)
1940
-2.2 C (28.0 F)
1941
-3.9 C (25.0 F)
1942
-3.3 C (26.1 F)
1943
-3.3 C (26.1 F)
1944
-3.3 C (26.1 F)
1945
-3.3 C (26.1 F)
1946
-3.9 C (25.0 F)
1947
-3.9 C (25.0 F)
1948
-3.3 C (26.1 F)
1949
-5.6 C (21.9 F)
1950
-4.4 C (24.1 F)
1951
-5.0 C (23.0 F)
1952
-4.4 C (24.1 F)
1953
-4.4 C (24.1 F)
1954
-4.4 C (24.1 F)
1955
-3.9 C (25.0 F)
1956
-3.9 C (25.0 F)
1957
-2.2 C (28.0 F)
1958
-3.3 C (26.1 F)
1959
-1.1 C (30.0 F)
1960
-5.0 C (23.0 F)
1961
-1.1 C (30.0 F)
1962
-4.4 C (24.1 F)
1963
-6.1 C (21.0 F)
1964
-2.2 C (28.0 F)
1965
-2.2 C (28.0 F)
1966
-2.8 C (27.0 F)
1967
-2.8 C (27.0 F)
1968
-5.0 C (23.0 F)
1969
-2.8 C (27.0 F)
1970
-0.6 C (30.9 F)
1971
-2.8 C (27.0 F)
1972
-1.1 C (30.0 F)
1973
-1.7 C (28.9 F)
1974
-3.3 C (26.1 F)
1975
-1.1 C (30.0 F)
1976
-2.2 C (28.0 F)
1977
0.6 C (33.1 F)
1978
-3.3 C (26.1 F)
1979
-1.7 C (28.9 F)
1980
0.6 C (33.1 F)
1981
0.6 C (33.1 F)
1982
-1.7 C (28.9 F)
1983
-1.1 C (30.0 F)
1984
-0.6 C (30.9 F)
1985
-2.2 C (28.0 F)
1986
1.1 C (34.0 F)
1987
-3.9 C (25.0 F)
1988
-2.2 C (28.0 F)
1989
-5.0 C (23.0 F)
1990
-5.6 C (21.9 F)
1991
-0.6 C (30.9 F)
1992
-1.7 C (28.9 F)
1993
-0.6 C (30.9 F)
1994
-1.7 C (28.9 F)
1995
1.1 C (34.0 F)
2001
0.6 C (33.1 F)
2002
-1.1 C (30.0 F)
2003
-1.1 C (30.0 F)
2004
0.0 C (32.0 F)
2005
-0.6 C (30.9 F)
2006
-0.6 C (30.9 F)
2007
-2.8 C (27.0 F)
2008
0.0 C (32.0 F)
2009
0.0 C (32.0 F)
2010
-0.6 C (30.9 F)
2011
0.0 C (32.0 F)
2012
2.8 C (37.0 F)
Wettest day (Rx1day)
The wettest day of the year at Pomona/Fairplex, 1893 to 2012. The record is 215.9 mm (8.5 in) in 1934, marked on the chart; the median year is 56.9 mm (2.2 in).
Wettest day (Rx1day) at Pomona/Fairplex by year
Year
Wettest day (Rx1day)
1893
31.5 mm (1.2 in)
1894
56.6 mm (2.2 in)
1895
43.2 mm (1.7 in)
1896
43.7 mm (1.7 in)
1897
39.6 mm (1.6 in)
1898
28.4 mm (1.1 in)
1899
41.1 mm (1.6 in)
1900
129.0 mm (5.1 in)
1901
36.1 mm (1.4 in)
1902
33.0 mm (1.3 in)
1906
68.6 mm (2.7 in)
1907
58.4 mm (2.3 in)
1908
38.1 mm (1.5 in)
1913
57.4 mm (2.3 in)
1914
142.2 mm (5.6 in)
1915
51.6 mm (2.0 in)
1916
123.2 mm (4.9 in)
1917
26.4 mm (1.0 in)
1918
49.0 mm (1.9 in)
1919
28.4 mm (1.1 in)
1920
37.1 mm (1.5 in)
1921
87.6 mm (3.4 in)
1922
55.9 mm (2.2 in)
1923
29.2 mm (1.1 in)
1924
64.8 mm (2.6 in)
1925
40.6 mm (1.6 in)
1926
97.8 mm (3.9 in)
1927
127.0 mm (5.0 in)
1928
41.9 mm (1.6 in)
1929
37.6 mm (1.5 in)
1930
54.6 mm (2.1 in)
1931
75.2 mm (3.0 in)
1932
86.4 mm (3.4 in)
1933
44.5 mm (1.8 in)
1934
215.9 mm (8.5 in)
1935
36.6 mm (1.4 in)
1936
53.3 mm (2.1 in)
1937
93.2 mm (3.7 in)
1938
106.9 mm (4.2 in)
1939
66.0 mm (2.6 in)
1940
81.8 mm (3.2 in)
1941
65.3 mm (2.6 in)
1942
30.2 mm (1.2 in)
1943
124.5 mm (4.9 in)
1944
48.5 mm (1.9 in)
1945
77.5 mm (3.1 in)
1946
66.3 mm (2.6 in)
1947
32.3 mm (1.3 in)
1948
23.4 mm (0.9 in)
1949
57.2 mm (2.3 in)
1950
35.6 mm (1.4 in)
1951
103.4 mm (4.1 in)
1952
84.8 mm (3.3 in)
1953
19.1 mm (0.8 in)
1954
75.4 mm (3.0 in)
1955
40.9 mm (1.6 in)
1956
162.1 mm (6.4 in)
1957
51.3 mm (2.0 in)
1958
81.5 mm (3.2 in)
1959
67.8 mm (2.7 in)
1960
33.8 mm (1.3 in)
1961
44.2 mm (1.7 in)
1962
65.8 mm (2.6 in)
1963
77.0 mm (3.0 in)
1964
31.8 mm (1.3 in)
1965
55.9 mm (2.2 in)
1966
70.9 mm (2.8 in)
1967
53.6 mm (2.1 in)
1968
97.3 mm (3.8 in)
1969
109.7 mm (4.3 in)
1970
57.7 mm (2.3 in)
1971
64.5 mm (2.5 in)
1972
39.4 mm (1.6 in)
1973
56.1 mm (2.2 in)
1974
65.3 mm (2.6 in)
1975
42.7 mm (1.7 in)
1976
53.6 mm (2.1 in)
1977
34.0 mm (1.3 in)
1978
91.7 mm (3.6 in)
1979
63.5 mm (2.5 in)
1980
92.5 mm (3.6 in)
1981
28.4 mm (1.1 in)
1982
62.7 mm (2.5 in)
1983
100.8 mm (4.0 in)
1984
53.8 mm (2.1 in)
1985
43.9 mm (1.7 in)
1986
78.7 mm (3.1 in)
1987
76.2 mm (3.0 in)
1988
72.4 mm (2.9 in)
1989
35.6 mm (1.4 in)
1990
78.7 mm (3.1 in)
1991
94.2 mm (3.7 in)
1992
45.7 mm (1.8 in)
1993
90.2 mm (3.6 in)
1994
51.1 mm (2.0 in)
1995
71.9 mm (2.8 in)
2001
57.2 mm (2.3 in)
2002
5.1 mm (0.20 in)
2003
95.3 mm (3.8 in)
2004
88.9 mm (3.5 in)
2005
78.7 mm (3.1 in)
2006
45.7 mm (1.8 in)
2007
35.6 mm (1.4 in)
2008
145.0 mm (5.7 in)
2009
31.8 mm (1.3 in)
2010
68.8 mm (2.7 in)
2011
31.2 mm (1.2 in)
2012
34.5 mm (1.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Pomona/Fairplex, 1893 to 2012. The record is 291.3 mm (11.5 in) in 1980, marked on the chart; the median year is 100.9 mm (4.0 in).
Wettest five days (Rx5day) at Pomona/Fairplex by year
Year
Wettest five days (Rx5day)
1893
85.1 mm (3.4 in)
1894
125.0 mm (4.9 in)
1895
134.9 mm (5.3 in)
1896
80.7 mm (3.2 in)
1897
106.6 mm (4.2 in)
1898
43.3 mm (1.7 in)
1899
49.8 mm (2.0 in)
1900
195.3 mm (7.7 in)
1901
96.6 mm (3.8 in)
1902
75.1 mm (3.0 in)
1906
96.5 mm (3.8 in)
1907
166.3 mm (6.5 in)
1908
38.2 mm (1.5 in)
1913
144.6 mm (5.7 in)
1914
243.9 mm (9.6 in)
1915
106.0 mm (4.2 in)
1916
254.1 mm (10.0 in)
1917
81.8 mm (3.2 in)
1918
110.5 mm (4.4 in)
1919
56.6 mm (2.2 in)
1920
74.2 mm (2.9 in)
1921
182.3 mm (7.2 in)
1922
94.0 mm (3.7 in)
1923
48.4 mm (1.9 in)
1924
92.2 mm (3.6 in)
1925
60.4 mm (2.4 in)
1926
188.7 mm (7.4 in)
1927
281.4 mm (11.1 in)
1928
70.6 mm (2.8 in)
1929
51.9 mm (2.0 in)
1930
91.8 mm (3.6 in)
1931
109.7 mm (4.3 in)
1932
118.8 mm (4.7 in)
1933
99.4 mm (3.9 in)
1934
268.3 mm (10.6 in)
1935
60.2 mm (2.4 in)
1936
132.6 mm (5.2 in)
1937
110.2 mm (4.3 in)
1938
257.2 mm (10.1 in)
1939
100.3 mm (3.9 in)
1940
109.5 mm (4.3 in)
1941
166.1 mm (6.5 in)
1942
46.5 mm (1.8 in)
1943
245.9 mm (9.7 in)
1944
137.2 mm (5.4 in)
1945
159.9 mm (6.3 in)
1946
146.8 mm (5.8 in)
1947
58.5 mm (2.3 in)
1948
45.7 mm (1.8 in)
1949
76.8 mm (3.0 in)
1950
65.7 mm (2.6 in)
1951
128.3 mm (5.1 in)
1952
138.0 mm (5.4 in)
1953
27.2 mm (1.1 in)
1954
99.5 mm (3.9 in)
1955
71.4 mm (2.8 in)
1956
218.7 mm (8.6 in)
1957
120.4 mm (4.7 in)
1958
123.7 mm (4.9 in)
1959
67.8 mm (2.7 in)
1960
60.7 mm (2.4 in)
1961
54.7 mm (2.2 in)
1962
126.7 mm (5.0 in)
1963
95.3 mm (3.8 in)
1964
50.4 mm (2.0 in)
1965
139.0 mm (5.5 in)
1966
208.9 mm (8.2 in)
1967
125.2 mm (4.9 in)
1968
101.6 mm (4.0 in)
1969
204.0 mm (8.0 in)
1970
138.2 mm (5.4 in)
1971
130.8 mm (5.1 in)
1972
59.4 mm (2.3 in)
1973
132.4 mm (5.2 in)
1974
192.3 mm (7.6 in)
1975
75.5 mm (3.0 in)
1976
90.2 mm (3.6 in)
1977
99.5 mm (3.9 in)
1978
241.8 mm (9.5 in)
1979
87.1 mm (3.4 in)
1980
291.3 mm (11.5 in)
1981
55.4 mm (2.2 in)
1982
103.6 mm (4.1 in)
1983
267.2 mm (10.5 in)
1984
109.1 mm (4.3 in)
1985
37.3 mm (1.5 in)
1986
103.3 mm (4.1 in)
1987
111.0 mm (4.4 in)
1988
86.1 mm (3.4 in)
1989
45.0 mm (1.8 in)
1990
90.3 mm (3.6 in)
1991
156.9 mm (6.2 in)
1992
100.1 mm (3.9 in)
1993
153.2 mm (6.0 in)
1994
51.9 mm (2.0 in)
1995
151.0 mm (5.9 in)
2001
98.9 mm (3.9 in)
2002
5.1 mm (0.20 in)
2003
95.3 mm (3.8 in)
2004
171.9 mm (6.8 in)
2005
220.9 mm (8.7 in)
2006
83.8 mm (3.3 in)
2007
38.7 mm (1.5 in)
2008
233.3 mm (9.2 in)
2009
85.6 mm (3.4 in)
2010
183.5 mm (7.2 in)
2011
31.5 mm (1.2 in)
2012
38.1 mm (1.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Pomona/Fairplex, 1893 to 2012. The record is 278 days in 2002, marked on the chart; the median year is 122 days.
Longest dry spell (CDD) at Pomona/Fairplex by year
Year
Longest dry spell (CDD)
1893
18 days
1894
29 days
1895
33 days
1896
40 days
1897
64 days
1898
36 days
1899
125 days
1900
51 days
1901
149 days
1902
82 days
1906
21 days
1907
42 days
1908
24 days
1913
126 days
1914
116 days
1915
55 days
1916
60 days
1917
29 days
1918
75 days
1919
57 days
1920
124 days
1921
130 days
1922
88 days
1923
61 days
1924
165 days
1925
120 days
1926
154 days
1927
195 days
1928
151 days
1929
103 days
1930
94 days
1931
47 days
1932
127 days
1933
85 days
1934
100 days
1935
115 days
1936
81 days
1937
194 days
1938
81 days
1939
161 days
1940
170 days
1941
163 days
1942
102 days
1943
189 days
1944
134 days
1945
69 days
1946
116 days
1947
102 days
1948
136 days
1949
112 days
1950
109 days
1951
136 days
1952
142 days
1953
137 days
1954
196 days
1955
190 days
1956
76 days
1957
122 days
1958
133 days
1959
182 days
1960
158 days
1961
103 days
1962
140 days
1963
56 days
1964
140 days
1965
96 days
1966
142 days
1967
105 days
1968
116 days
1969
183 days
1970
185 days
1971
140 days
1972
98 days
1973
209 days
1974
174 days
1975
164 days
1976
47 days
1977
78 days
1978
142 days
1979
170 days
1980
194 days
1981
191 days
1982
120 days
1983
108 days
1984
130 days
1985
92 days
1986
225 days
1987
131 days
1988
149 days
1989
215 days
1990
175 days
1991
122 days
1992
203 days
1993
126 days
1994
33 days
1995
31 days
2001
184 days
2002
278 days
2003
179 days
2004
77 days
2005
162 days
2006
101 days
2007
223 days
2008
130 days
2009
57 days
2010
92 days
2011
121 days
2012
103 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
69 years with a frost
Across 69 years with a frost, the median last spring frost at Pomona/Fairplex falls on 14 March and the median first autumn frost on 24 November, which leaves a median of 252 days between them.
In 1949 to 2003 the median growing season was 287 days. That is 60 days more than in 1896 to 1936.
Fitted over all years, the growing season changes by +9.0 days per decade at this station.
Frost dates and growing season at Pomona/Fairplex
Measure
Median, all years
Earliest period (1896 to 1936)
Recent period (1949 to 2003)
Recent against earliest
Fitted trend
Last spring frost
14 March
25 March
28 February
25 days earlier
-5.9 days per decade
First autumn frost
24 November
19 November
11 December
22 days later
+3.1 days per decade
Growing days
252 days
227 days
287 days
60 days more
+9.0 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
85 years, 1901 to 2011
A day with at least 61.0 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 178.1 mm (7.0 in) of rain is expected about once in 100 years.
Rainfall return levels at Pomona/Fairplex: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
61.0 mm (2.4 in)
5 years
90.4 mm (3.6 in)
10 years
110.6 mm (4.4 in)
25 years
137.0 mm (5.4 in)
50 years
157.4 mm (6.2 in)
100 years
178.1 mm (7.0 in)
Longer than the 85 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, 85 years of values from 1901 to 2011.
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: 215.9 mm (8.5 in) in 1934; 162.1 mm (6.4 in) in 1956; 145.0 mm (5.7 in) in 2008.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Pomona/Fairplex standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Pomona/Fairplex 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.