Claremont Pomona Clg Weather Records (USC00041779)
Record envelope, standing records and threshold days for Claremont Pomona Clg (USC00041779), California, United States, with 88 years of record.
Key Facts for Claremont Pomona Clg
Claremont Pomona Clg (USC00041779) is a weather station in California, United States at 34.10 latitude and -117.72 longitude, 366 m (1,201 ft) above sea level.
The station reports from 1893 to 1980, 88 years of record.
1,464 records set at Claremont Pomona Clg still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Claremont Pomona Clg set a daily record high minimum temperature of 9.4 C (48.9 F) on 31 December 1980.
About the Station
Location: California, United States, 34.10 latitude, -117.72 longitude.
Elevation: 366 m (1,201 ft).
Period of record: 1893 to 1980, 88 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 Claremont Pomona Clg. 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 Claremont Pomona Clg, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
30.6 C (87.1 F)
-7.2 C (19.0 F)
n/a
n/a
Feb
32.2 C (90.0 F)
-6.7 C (19.9 F)
n/a
n/a
Mar
36.1 C (97.0 F)
-3.9 C (25.0 F)
n/a
n/a
Apr
38.3 C (100.9 F)
-1.7 C (28.9 F)
n/a
n/a
May
41.7 C (107.1 F)
0.0 C (32.0 F)
n/a
n/a
Jun
45.6 C (114.1 F)
-1.1 C (30.0 F)
n/a
n/a
Jul
45.6 C (114.1 F)
5.6 C (42.1 F)
n/a
n/a
Aug
44.4 C (111.9 F)
2.2 C (36.0 F)
n/a
n/a
Sep
45.0 C (113.0 F)
4.4 C (39.9 F)
n/a
n/a
Oct
41.7 C (107.1 F)
-0.6 C (30.9 F)
n/a
n/a
Nov
36.7 C (98.1 F)
-4.4 C (24.1 F)
n/a
n/a
Dec
32.2 C (90.0 F)
-6.1 C (21.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Claremont Pomona Clg still stand. 1926 holds the most, with 41.
Standing records at Claremont Pomona Clg by the year they were set
Year set
Standing records
1893
9
1894
20
1895
12
1896
21
1897
19
1898
19
1899
32
1900
24
1901
15
1902
31
1903
27
1904
19
1905
10
1906
22
1907
22
1908
19
1909
19
1910
27
1911
21
1912
13
1913
19
1914
15
1915
22
1916
22
1917
22
1918
26
1919
18
1920
12
1921
20
1922
15
1923
17
1924
19
1925
33
1926
41
1927
17
1928
13
1929
20
1930
25
1931
22
1932
14
1933
24
1934
18
1935
13
1936
9
1937
20
1938
11
1939
26
1940
18
1941
9
1942
11
1943
14
1944
14
1945
10
1946
9
1947
15
1948
12
1949
32
1950
20
1951
8
1952
10
1953
17
1954
15
1955
24
1956
8
1957
8
1959
12
1960
2
1961
14
1962
12
1963
20
1964
10
1965
22
1966
8
1967
15
1968
9
1969
10
1970
7
1971
28
1972
20
1973
11
1974
4
1975
12
1976
11
1977
8
1978
12
1979
17
1980
12
All-Time Record Progression
4 new records
4 all-time records were set at Claremont Pomona Clg between 15 July 1925 and 21 January 1937. Each dot is a new record.
When Claremont Pomona Clg set new all-time records
Date
Kind
Detail
1925-07-15
Record high minimum temperature
Record high minimum temperature 28.3 C (82.9 F)
1932-12-12
Record low maximum temperature
Record low maximum temperature 3.9 C (39.0 F)
1934-01-01
Record daily precipitation
Record daily precipitation 198.6 mm (7.8 in)
1937-01-21
Record low maximum temperature
Record low maximum temperature 3.3 C (37.9 F)
Wettest Day of Each Month
Jan: 198.6 mm (7.8 in)
The wettest day on record for each calendar month at Claremont Pomona Clg. The most was 198.6 mm (7.8 in) on 1 January 1934.
Record daily precipitation for each month at Claremont Pomona Clg
Month
Record daily precipitation (mm)
Date
Jan
198.6 mm (7.8 in)
1 January 1934
Feb
140.5 mm (5.5 in)
21 February 1914
Mar
145.5 mm (5.7 in)
2 March 1938
Apr
63.8 mm (2.5 in)
15 April 1903
May
62.7 mm (2.5 in)
9 May 1977
Jun
19.1 mm (0.8 in)
3 June 1925
Jul
10.7 mm (0.4 in)
29 July 1968
Aug
18.5 mm (0.7 in)
10 August 1942
Sep
81.3 mm (3.2 in)
25 September 1939
Oct
122.7 mm (4.8 in)
27 October 1896
Nov
113.8 mm (4.5 in)
13 November 1946
Dec
95.3 mm (3.8 in)
11 December 1943
Period of Record Coverage
1893 to 1980
Complete yearUnder 90 percent of days
87 years of record at Claremont Pomona Clg, 1893 to 1980. 10 years have data for under 90 percent of days and are left out of rankings: 1895, 1906, 1907, 1910, 1924, 1926, 1931, 1957 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 61 complete years at Claremont Pomona Clg, 1896 to 1979. Blue stripes are years cooler than the station's own mean of 16.6 C (61.9 F); red stripes are warmer. The coolest year was 1902, at 14.8 C (58.6 F), and the warmest was 1934, at 17.9 C (64.2 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Claremont Pomona Clg as warming stripes, 1896 to 1979
Year
Annual mean temperature
Difference from the station mean
1896
16.2 C
-0.41 C
1897
15.4 C
-1.18 C
1899
15.3 C
-1.25 C
1902
14.8 C
-1.82 C
1904
17.9 C
+1.31 C
1908
16.7 C
+0.08 C
1910
17.5 C
+0.95 C
1911
15.9 C
-0.65 C
1913
16.4 C
-0.17 C
1914
16.4 C
-0.16 C
1915
16.1 C
-0.46 C
1916
15.7 C
-0.88 C
1917
16.1 C
-0.45 C
1918
16.2 C
-0.43 C
1919
16.4 C
-0.14 C
1920
16.0 C
-0.56 C
1921
16.6 C
-0.02 C
1922
16.3 C
-0.31 C
1923
16.7 C
+0.16 C
1925
17.7 C
+1.15 C
1927
16.2 C
-0.41 C
1928
16.9 C
+0.29 C
1929
16.9 C
+0.30 C
1930
16.6 C
+0.01 C
1932
16.0 C
-0.54 C
1933
16.2 C
-0.38 C
1934
17.9 C
+1.33 C
1935
16.6 C
-0.02 C
1936
17.5 C
+0.96 C
1937
16.7 C
+0.14 C
1938
17.0 C
+0.46 C
1940
17.0 C
+0.45 C
1941
16.2 C
-0.40 C
1942
16.3 C
-0.31 C
1943
16.9 C
+0.29 C
1944
15.7 C
-0.91 C
1945
16.4 C
-0.14 C
1946
16.8 C
+0.20 C
1947
17.2 C
+0.65 C
1948
16.1 C
-0.53 C
1950
17.0 C
+0.43 C
1951
16.6 C
-0.01 C
1952
16.5 C
-0.09 C
1953
17.0 C
+0.38 C
1954
16.9 C
+0.36 C
1955
16.7 C
+0.14 C
1960
17.5 C
+0.87 C
1961
17.3 C
+0.68 C
1962
16.7 C
+0.07 C
1967
17.1 C
+0.56 C
1969
16.8 C
+0.20 C
1970
17.0 C
+0.37 C
1971
16.3 C
-0.28 C
1972
16.7 C
+0.14 C
1973
16.2 C
-0.42 C
1974
16.6 C
+0.03 C
1975
16.0 C
-0.57 C
1976
17.2 C
+0.64 C
1977
16.9 C
+0.32 C
1978
16.8 C
+0.23 C
1979
16.6 C
-0.03 C
The annual mean temperature here has risen by 0.08 C (0.02 to 0.14) per decade over 1896 to 1979. In Fahrenheit: 0.14 F (0.03 to 0.26) per decade. The slope is a straight line fitted to 61 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Claremont Pomona Clg
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.08 C (0.02 to 0.14) per decade
0.14 F (0.03 to 0.26) per decade
1896 to 1979
61
Rise
Mean daily maximum
-0.12 C (-0.21 to -0.03) per decade
-0.22 F (-0.39 to -0.05) per decade
1896 to 1979
61
Fall
Mean daily minimum
0.3 C (0.2 to 0.4) per decade
0.5 F (0.4 to 0.6) per decade
1896 to 1979
61
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 1980
Yearly extremes at Claremont Pomona Clg: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
45.6 C (114.1 F)
1917
40.6 C (105.1 F)
87
Coldest night (TNn)
-7.2 C (19.0 F)
1913
-2.8 C (27.0 F)
87
Wettest day (Rx1day)
198.6 mm (7.8 in)
1934
55.9 mm (2.2 in)
87
Wettest five days (Rx5day)
330.3 mm (13.0 in)
1980
98.5 mm (3.9 in)
87
Longest dry spell (CDD)
233 days
1973
95 days
87
Hottest day (TXx)
The hottest day of the year at Claremont Pomona Clg, 1893 to 1980. The record is 45.6 C (114.1 F) in 1917, marked on the chart; the median year is 40.6 C (105.1 F).
Hottest day (TXx) at Claremont Pomona Clg by year
Year
Hottest day (TXx)
1893
37.2 C (99.0 F)
1894
39.4 C (102.9 F)
1895
36.1 C (97.0 F)
1896
40.0 C (104.0 F)
1897
38.3 C (100.9 F)
1898
39.4 C (102.9 F)
1899
36.7 C (98.1 F)
1900
40.6 C (105.1 F)
1901
39.4 C (102.9 F)
1902
41.1 C (106.0 F)
1903
40.0 C (104.0 F)
1904
41.7 C (107.1 F)
1905
42.2 C (108.0 F)
1906
41.7 C (107.1 F)
1907
43.3 C (109.9 F)
1908
42.2 C (108.0 F)
1909
44.4 C (111.9 F)
1910
43.3 C (109.9 F)
1911
41.7 C (107.1 F)
1912
40.0 C (104.0 F)
1913
42.8 C (109.0 F)
1914
37.8 C (100.0 F)
1915
41.1 C (106.0 F)
1916
40.0 C (104.0 F)
1917
45.6 C (114.1 F)
1918
42.8 C (109.0 F)
1919
41.1 C (106.0 F)
1920
40.0 C (104.0 F)
1921
42.2 C (108.0 F)
1922
44.4 C (111.9 F)
1923
40.6 C (105.1 F)
1924
42.2 C (108.0 F)
1925
45.6 C (114.1 F)
1926
38.9 C (102.0 F)
1927
39.4 C (102.9 F)
1928
40.0 C (104.0 F)
1929
43.3 C (109.9 F)
1930
42.2 C (108.0 F)
1931
43.9 C (111.0 F)
1932
42.8 C (109.0 F)
1933
42.8 C (109.0 F)
1934
45.0 C (113.0 F)
1935
43.3 C (109.9 F)
1936
43.9 C (111.0 F)
1937
42.2 C (108.0 F)
1938
43.9 C (111.0 F)
1939
43.3 C (109.9 F)
1940
39.4 C (102.9 F)
1941
37.8 C (100.0 F)
1942
41.7 C (107.1 F)
1943
43.9 C (111.0 F)
1944
42.8 C (109.0 F)
1945
42.8 C (109.0 F)
1946
39.4 C (102.9 F)
1947
41.1 C (106.0 F)
1948
43.3 C (109.9 F)
1949
42.8 C (109.0 F)
1950
41.7 C (107.1 F)
1951
40.0 C (104.0 F)
1952
40.6 C (105.1 F)
1953
40.6 C (105.1 F)
1954
39.4 C (102.9 F)
1955
45.0 C (113.0 F)
1956
40.6 C (105.1 F)
1957
41.1 C (106.0 F)
1959
41.1 C (106.0 F)
1960
40.6 C (105.1 F)
1961
38.3 C (100.9 F)
1962
37.8 C (100.0 F)
1963
41.7 C (107.1 F)
1964
37.8 C (100.0 F)
1965
38.3 C (100.9 F)
1966
36.7 C (98.1 F)
1967
40.6 C (105.1 F)
1968
38.9 C (102.0 F)
1969
40.0 C (104.0 F)
1970
38.9 C (102.0 F)
1971
42.2 C (108.0 F)
1972
38.3 C (100.9 F)
1973
40.0 C (104.0 F)
1974
38.3 C (100.9 F)
1975
37.8 C (100.0 F)
1976
40.6 C (105.1 F)
1977
37.8 C (100.0 F)
1978
38.9 C (102.0 F)
1979
40.6 C (105.1 F)
1980
38.9 C (102.0 F)
Coldest night (TNn)
The coldest night of the year at Claremont Pomona Clg, 1893 to 1980. The record is -7.2 C (19.0 F) in 1913, marked on the chart; the median year is -2.8 C (27.0 F).
Coldest night (TNn) at Claremont Pomona Clg by year
Year
Coldest night (TNn)
1893
-1.1 C (30.0 F)
1894
-4.4 C (24.1 F)
1895
-1.1 C (30.0 F)
1896
-2.2 C (28.0 F)
1897
-3.9 C (25.0 F)
1898
-3.3 C (26.1 F)
1899
-6.7 C (19.9 F)
1900
-5.0 C (23.0 F)
1901
-5.6 C (21.9 F)
1902
-3.9 C (25.0 F)
1903
-3.3 C (26.1 F)
1904
-6.1 C (21.0 F)
1905
-2.8 C (27.0 F)
1906
-1.7 C (28.9 F)
1907
-3.9 C (25.0 F)
1908
-4.4 C (24.1 F)
1909
-5.0 C (23.0 F)
1910
-3.9 C (25.0 F)
1911
-6.1 C (21.0 F)
1912
-3.9 C (25.0 F)
1913
-7.2 C (19.0 F)
1914
-4.4 C (24.1 F)
1915
-2.8 C (27.0 F)
1916
-3.9 C (25.0 F)
1917
-3.3 C (26.1 F)
1918
-3.3 C (26.1 F)
1919
-3.3 C (26.1 F)
1920
-2.2 C (28.0 F)
1921
-2.2 C (28.0 F)
1922
-6.1 C (21.0 F)
1923
-2.2 C (28.0 F)
1924
-3.9 C (25.0 F)
1925
-1.1 C (30.0 F)
1926
-1.1 C (30.0 F)
1927
-2.8 C (27.0 F)
1928
-2.8 C (27.0 F)
1929
-4.4 C (24.1 F)
1930
-3.3 C (26.1 F)
1931
-3.9 C (25.0 F)
1932
-3.3 C (26.1 F)
1933
-2.8 C (27.0 F)
1934
-1.1 C (30.0 F)
1935
-3.3 C (26.1 F)
1936
-1.7 C (28.9 F)
1937
-5.6 C (21.9 F)
1938
-2.2 C (28.0 F)
1939
-3.9 C (25.0 F)
1940
-2.8 C (27.0 F)
1941
-2.2 C (28.0 F)
1942
-3.9 C (25.0 F)
1943
-3.3 C (26.1 F)
1944
-1.1 C (30.0 F)
1945
-1.7 C (28.9 F)
1946
-2.2 C (28.0 F)
1947
-2.2 C (28.0 F)
1948
-3.3 C (26.1 F)
1949
-5.6 C (21.9 F)
1950
-3.3 C (26.1 F)
1951
-3.3 C (26.1 F)
1952
-3.9 C (25.0 F)
1953
-1.7 C (28.9 F)
1954
-1.7 C (28.9 F)
1955
-2.2 C (28.0 F)
1956
-2.2 C (28.0 F)
1957
-2.8 C (27.0 F)
1959
-0.6 C (30.9 F)
1960
-3.3 C (26.1 F)
1961
0.0 C (32.0 F)
1962
-0.6 C (30.9 F)
1963
-2.8 C (27.0 F)
1964
0.0 C (32.0 F)
1965
-3.3 C (26.1 F)
1966
-1.7 C (28.9 F)
1967
-3.3 C (26.1 F)
1968
-1.1 C (30.0 F)
1969
-1.1 C (30.0 F)
1970
0.0 C (32.0 F)
1971
-2.2 C (28.0 F)
1972
-1.1 C (30.0 F)
1973
-1.1 C (30.0 F)
1974
-1.7 C (28.9 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
-0.6 C (30.9 F)
1980
2.2 C (36.0 F)
Wettest day (Rx1day)
The wettest day of the year at Claremont Pomona Clg, 1893 to 1980. The record is 198.6 mm (7.8 in) in 1934, marked on the chart; the median year is 55.9 mm (2.2 in).
Wettest day (Rx1day) at Claremont Pomona Clg by year
Year
Wettest day (Rx1day)
1893
55.9 mm (2.2 in)
1894
50.8 mm (2.0 in)
1895
47.5 mm (1.9 in)
1896
122.7 mm (4.8 in)
1897
49.5 mm (1.9 in)
1898
35.3 mm (1.4 in)
1899
28.4 mm (1.1 in)
1900
89.2 mm (3.5 in)
1901
52.1 mm (2.1 in)
1902
31.5 mm (1.2 in)
1903
105.9 mm (4.2 in)
1904
84.6 mm (3.3 in)
1905
53.3 mm (2.1 in)
1906
57.4 mm (2.3 in)
1907
49.0 mm (1.9 in)
1908
54.1 mm (2.1 in)
1909
82.6 mm (3.3 in)
1910
31.2 mm (1.2 in)
1911
75.7 mm (3.0 in)
1912
44.2 mm (1.7 in)
1913
57.2 mm (2.3 in)
1914
140.5 mm (5.5 in)
1915
76.2 mm (3.0 in)
1916
118.9 mm (4.7 in)
1917
22.9 mm (0.9 in)
1918
54.9 mm (2.2 in)
1919
37.1 mm (1.5 in)
1920
39.9 mm (1.6 in)
1921
108.7 mm (4.3 in)
1922
60.2 mm (2.4 in)
1923
31.2 mm (1.2 in)
1924
50.8 mm (2.0 in)
1925
52.1 mm (2.1 in)
1926
98.0 mm (3.9 in)
1927
119.9 mm (4.7 in)
1928
50.5 mm (2.0 in)
1929
41.7 mm (1.6 in)
1930
53.3 mm (2.1 in)
1931
73.2 mm (2.9 in)
1932
82.6 mm (3.3 in)
1933
65.5 mm (2.6 in)
1934
198.6 mm (7.8 in)
1935
39.4 mm (1.6 in)
1936
49.3 mm (1.9 in)
1937
97.8 mm (3.9 in)
1938
145.5 mm (5.7 in)
1939
81.3 mm (3.2 in)
1940
69.1 mm (2.7 in)
1941
82.0 mm (3.2 in)
1942
26.9 mm (1.1 in)
1943
147.6 mm (5.8 in)
1944
45.7 mm (1.8 in)
1945
91.2 mm (3.6 in)
1946
113.8 mm (4.5 in)
1947
36.6 mm (1.4 in)
1948
32.8 mm (1.3 in)
1949
49.0 mm (1.9 in)
1950
50.5 mm (2.0 in)
1951
80.5 mm (3.2 in)
1952
96.3 mm (3.8 in)
1953
19.8 mm (0.8 in)
1954
81.3 mm (3.2 in)
1955
34.3 mm (1.4 in)
1956
176.5 mm (6.9 in)
1957
60.5 mm (2.4 in)
1959
70.6 mm (2.8 in)
1960
37.6 mm (1.5 in)
1961
19.1 mm (0.8 in)
1962
70.4 mm (2.8 in)
1963
77.5 mm (3.1 in)
1964
37.8 mm (1.5 in)
1965
46.5 mm (1.8 in)
1966
49.8 mm (2.0 in)
1967
71.1 mm (2.8 in)
1968
89.9 mm (3.5 in)
1969
71.9 mm (2.8 in)
1970
78.7 mm (3.1 in)
1971
32.0 mm (1.3 in)
1972
35.1 mm (1.4 in)
1973
47.0 mm (1.9 in)
1974
26.4 mm (1.0 in)
1975
45.7 mm (1.8 in)
1976
38.6 mm (1.5 in)
1977
89.2 mm (3.5 in)
1978
102.4 mm (4.0 in)
1979
61.2 mm (2.4 in)
1980
138.7 mm (5.5 in)
Wettest five days (Rx5day)
The wettest five days of the year at Claremont Pomona Clg, 1893 to 1980. The record is 330.3 mm (13.0 in) in 1980, marked on the chart; the median year is 98.5 mm (3.9 in).
Wettest five days (Rx5day) at Claremont Pomona Clg by year
Year
Wettest five days (Rx5day)
1893
81.0 mm (3.2 in)
1894
104.5 mm (4.1 in)
1895
124.3 mm (4.9 in)
1896
124.5 mm (4.9 in)
1897
102.8 mm (4.0 in)
1898
43.5 mm (1.7 in)
1899
52.4 mm (2.1 in)
1900
177.9 mm (7.0 in)
1901
97.3 mm (3.8 in)
1902
56.4 mm (2.2 in)
1903
72.4 mm (2.9 in)
1904
104.7 mm (4.1 in)
1905
121.5 mm (4.8 in)
1906
88.7 mm (3.5 in)
1907
131.4 mm (5.2 in)
1908
124.8 mm (4.9 in)
1909
61.7 mm (2.4 in)
1910
134.8 mm (5.3 in)
1911
117.3 mm (4.6 in)
1912
94.5 mm (3.7 in)
1913
143.8 mm (5.7 in)
1914
276.1 mm (10.9 in)
1915
146.1 mm (5.8 in)
1916
264.2 mm (10.4 in)
1917
73.4 mm (2.9 in)
1918
83.6 mm (3.3 in)
1919
64.0 mm (2.5 in)
1920
88.7 mm (3.5 in)
1921
199.2 mm (7.8 in)
1922
97.3 mm (3.8 in)
1923
37.8 mm (1.5 in)
1924
82.6 mm (3.3 in)
1925
52.1 mm (2.1 in)
1926
98.0 mm (3.9 in)
1927
273.1 mm (10.8 in)
1928
59.4 mm (2.3 in)
1929
52.1 mm (2.1 in)
1930
98.5 mm (3.9 in)
1931
111.0 mm (4.4 in)
1932
113.1 mm (4.5 in)
1933
126.4 mm (5.0 in)
1934
239.5 mm (9.4 in)
1935
60.7 mm (2.4 in)
1936
136.7 mm (5.4 in)
1937
97.1 mm (3.8 in)
1938
253.8 mm (10.0 in)
1939
124.3 mm (4.9 in)
1940
113.3 mm (4.5 in)
1941
135.3 mm (5.3 in)
1942
51.5 mm (2.0 in)
1943
275.6 mm (10.9 in)
1944
134.3 mm (5.3 in)
1945
174.5 mm (6.9 in)
1946
132.1 mm (5.2 in)
1947
52.1 mm (2.1 in)
1948
53.3 mm (2.1 in)
1949
98.5 mm (3.9 in)
1950
63.2 mm (2.5 in)
1951
128.2 mm (5.0 in)
1952
131.1 mm (5.2 in)
1953
24.2 mm (1.0 in)
1954
113.3 mm (4.5 in)
1955
71.6 mm (2.8 in)
1956
226.6 mm (8.9 in)
1957
124.8 mm (4.9 in)
1959
70.6 mm (2.8 in)
1960
57.9 mm (2.3 in)
1961
19.1 mm (0.8 in)
1962
70.4 mm (2.8 in)
1963
101.7 mm (4.0 in)
1964
63.8 mm (2.5 in)
1965
92.9 mm (3.7 in)
1966
55.9 mm (2.2 in)
1967
130.3 mm (5.1 in)
1968
91.2 mm (3.6 in)
1969
172.5 mm (6.8 in)
1970
158.7 mm (6.2 in)
1971
60.2 mm (2.4 in)
1972
61.6 mm (2.4 in)
1973
81.8 mm (3.2 in)
1974
27.9 mm (1.1 in)
1975
50.3 mm (2.0 in)
1976
48.5 mm (1.9 in)
1977
141.2 mm (5.6 in)
1978
264.5 mm (10.4 in)
1979
106.1 mm (4.2 in)
1980
330.3 mm (13.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Claremont Pomona Clg, 1893 to 1980. The record is 233 days in 1973, marked on the chart; the median year is 95 days.
Longest dry spell (CDD) at Claremont Pomona Clg by year
Year
Longest dry spell (CDD)
1893
68 days
1894
34 days
1895
43 days
1896
103 days
1897
91 days
1898
73 days
1899
39 days
1900
51 days
1901
59 days
1902
111 days
1903
164 days
1904
71 days
1905
127 days
1906
94 days
1907
49 days
1908
89 days
1909
36 days
1910
110 days
1911
90 days
1912
143 days
1913
41 days
1914
53 days
1915
41 days
1916
60 days
1917
37 days
1918
55 days
1919
39 days
1920
39 days
1921
38 days
1922
87 days
1923
29 days
1924
37 days
1925
32 days
1926
148 days
1927
112 days
1928
156 days
1929
104 days
1930
146 days
1931
42 days
1932
127 days
1933
147 days
1934
100 days
1935
62 days
1936
93 days
1937
123 days
1938
80 days
1939
119 days
1940
95 days
1941
134 days
1942
103 days
1943
184 days
1944
129 days
1945
77 days
1946
131 days
1947
72 days
1948
136 days
1949
140 days
1950
162 days
1951
116 days
1952
89 days
1953
81 days
1954
196 days
1955
166 days
1956
75 days
1957
51 days
1959
184 days
1960
158 days
1961
199 days
1962
111 days
1963
130 days
1964
131 days
1965
59 days
1966
130 days
1967
105 days
1968
44 days
1969
102 days
1970
212 days
1971
129 days
1972
108 days
1973
233 days
1974
144 days
1975
110 days
1976
84 days
1977
84 days
1978
132 days
1979
94 days
1980
77 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
49 years with a frost
Across 49 years with a frost, the median last spring frost at Claremont Pomona Clg falls on 12 March and the median first autumn frost on 4 December, which leaves a median of 270 days between them.
Fitted over all years, the growing season changes by +6.8 days per decade at this station.
Frost dates and growing season at Claremont Pomona Clg
Measure
Median, all years
Earliest period
Recent period (1929 to 1979)
Recent against earliest
Fitted trend
Last spring frost
12 March
n/a
11 March
n/a
-5.4 days per decade
First autumn frost
4 December
n/a
6 December
n/a
+1.4 days per decade
Growing days
270 days
n/a
272 days
n/a
+6.8 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
53 years, 1898 to 1980
A day with at least 58.5 mm (2.3 in) of rain is expected about once in 2 years. A day with at least 217.7 mm (8.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Claremont Pomona Clg: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
58.5 mm (2.3 in)
5 years
91.4 mm (3.6 in)
10 years
116.6 mm (4.6 in)
25 years
153.0 mm (6.0 in)
50 years
183.7 mm (7.2 in)
100 years
217.7 mm (8.6 in)
Longer than the 53 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, 53 years of values from 1898 to 1980.
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: 198.6 mm (7.8 in) in 1934; 176.5 mm (6.9 in) in 1956; 147.6 mm (5.8 in) in 1943.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Claremont Pomona Clg standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Claremont Pomona Clg 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.