Record envelope, standing records and threshold days for Corona (USC00042031), California, United States, with 81 years of record.
Key Facts for Corona
Corona (USC00042031) is a weather station in California, United States at 33.88 latitude and -117.55 longitude, 186 m (610 ft) above sea level.
The station reports from 1908 to 1988, 81 years of record.
1,464 records set at Corona still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Corona set a daily record low minimum temperature of 10.0 C (50.0 F) on 27 July 1988.
About the Station
Location: California, United States, 33.88 latitude, -117.55 longitude.
Elevation: 186 m (610 ft).
Period of record: 1908 to 1988, 81 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 Corona. 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 Corona, 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)
-7.2 C (19.0 F)
n/a
n/a
Feb
33.9 C (93.0 F)
-4.4 C (24.1 F)
n/a
n/a
Mar
37.8 C (100.0 F)
-4.4 C (24.1 F)
n/a
n/a
Apr
37.8 C (100.0 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
47.8 C (118.0 F)
4.4 C (39.9 F)
n/a
n/a
Jul
46.7 C (116.1 F)
5.0 C (41.0 F)
n/a
n/a
Aug
45.0 C (113.0 F)
5.0 C (41.0 F)
n/a
n/a
Sep
45.6 C (114.1 F)
5.0 C (41.0 F)
n/a
n/a
Oct
42.2 C (108.0 F)
-1.7 C (28.9 F)
n/a
n/a
Nov
37.2 C (99.0 F)
-3.3 C (26.1 F)
n/a
n/a
Dec
34.4 C (93.9 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 Corona still stand. 1916 holds the most, with 43.
Standing records at Corona by the year they were set
Year set
Standing records
1913
2
1914
18
1915
18
1916
43
1917
41
1918
26
1919
21
1920
12
1921
20
1922
25
1923
26
1924
26
1925
42
1926
22
1927
25
1928
22
1929
27
1930
29
1931
24
1932
37
1933
35
1934
19
1935
39
1936
17
1937
20
1938
20
1939
33
1940
10
1941
16
1942
16
1943
16
1944
24
1945
25
1946
18
1947
10
1948
4
1949
20
1950
21
1951
13
1952
16
1953
33
1954
15
1955
25
1956
24
1957
15
1958
19
1959
15
1960
10
1961
22
1962
16
1963
16
1964
11
1965
22
1966
13
1967
20
1968
12
1969
8
1970
11
1971
27
1972
14
1973
13
1974
9
1975
16
1976
17
1977
10
1978
5
1979
19
1980
11
1981
7
1982
6
1983
22
1984
19
1985
9
1986
11
1987
22
1988
22
All-Time Record Progression
2 new records
2 all-time records were set at Corona between 9 September 1984 and 19 January 1988. Each dot is a new record.
When Corona set new all-time records
Date
Kind
Detail
1984-09-09
Record high minimum temperature
Record high minimum temperature 25.0 C (77.0 F)
1988-01-19
Record low minimum temperature
Record low minimum temperature -7.2 C (19.0 F)
Wettest Day of Each Month
Feb: 128.3 mm (5.1 in)
The wettest day on record for each calendar month at Corona. The most was 128.3 mm (5.1 in) on 16 February 1927.
Record daily precipitation for each month at Corona
Month
Record daily precipitation (mm)
Date
Jan
127.0 mm (5.0 in)
27 January 1916
Feb
128.3 mm (5.1 in)
16 February 1927
Mar
109.2 mm (4.3 in)
3 March 1938
Apr
109.2 mm (4.3 in)
5 April 1926
May
21.6 mm (0.9 in)
1 May 1941
Jun
10.7 mm (0.4 in)
5 June 1934
Jul
7.6 mm (0.30 in)
25 July 1956
Aug
42.4 mm (1.7 in)
17 August 1977
Sep
41.9 mm (1.6 in)
25 September 1939
Oct
57.2 mm (2.3 in)
31 October 1927
Nov
56.6 mm (2.2 in)
22 November 1965
Dec
79.2 mm (3.1 in)
24 December 1916
Period of Record Coverage
1913 to 1988
Complete yearUnder 90 percent of days
76 years of record at Corona, 1913 to 1988. 5 years have data for under 90 percent of days and are left out of rankings: 1913, 1922, 1948, 1955, 1988.
Cooler than the station meanWarmer than the station mean
One stripe for each of 65 complete years at Corona, 1915 to 1987. Blue stripes are years cooler than the station's own mean of 17.4 C (63.3 F); red stripes are warmer. The coolest year was 1935, at 16.1 C (60.9 F), and the warmest was 1984, at 19.0 C (66.1 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at Corona as warming stripes, 1915 to 1987
Year
Annual mean temperature
Difference from the station mean
1915
16.9 C
-0.51 C
1917
17.5 C
+0.07 C
1921
17.6 C
+0.23 C
1923
17.7 C
+0.33 C
1924
18.2 C
+0.78 C
1925
17.6 C
+0.15 C
1926
17.6 C
+0.16 C
1927
17.2 C
-0.18 C
1928
17.8 C
+0.40 C
1929
17.7 C
+0.28 C
1930
17.0 C
-0.45 C
1931
18.0 C
+0.63 C
1932
16.5 C
-0.87 C
1933
16.5 C
-0.91 C
1934
17.5 C
+0.08 C
1935
16.1 C
-1.35 C
1936
17.4 C
+0.04 C
1938
17.1 C
-0.32 C
1939
16.8 C
-0.60 C
1940
17.5 C
+0.13 C
1941
16.7 C
-0.74 C
1942
16.9 C
-0.46 C
1943
17.5 C
+0.13 C
1944
16.1 C
-1.29 C
1945
16.6 C
-0.77 C
1946
16.9 C
-0.53 C
1947
17.2 C
-0.25 C
1949
16.4 C
-0.97 C
1950
17.1 C
-0.34 C
1951
16.8 C
-0.63 C
1952
16.9 C
-0.54 C
1953
17.6 C
+0.23 C
1954
17.4 C
+0.00 C
1956
17.4 C
+0.02 C
1957
17.7 C
+0.27 C
1958
18.1 C
+0.70 C
1959
18.4 C
+0.97 C
1960
17.6 C
+0.16 C
1961
17.6 C
+0.18 C
1962
16.6 C
-0.81 C
1963
17.3 C
-0.15 C
1964
16.9 C
-0.48 C
1965
17.1 C
-0.29 C
1966
17.8 C
+0.40 C
1967
17.8 C
+0.35 C
1968
17.8 C
+0.42 C
1969
17.3 C
-0.11 C
1970
17.6 C
+0.24 C
1971
17.2 C
-0.25 C
1972
17.5 C
+0.06 C
1973
16.6 C
-0.81 C
1974
17.3 C
-0.09 C
1975
16.6 C
-0.76 C
1976
18.0 C
+0.57 C
1977
17.9 C
+0.45 C
1978
17.8 C
+0.38 C
1979
17.6 C
+0.23 C
1980
18.0 C
+0.56 C
1981
18.6 C
+1.22 C
1982
17.4 C
-0.01 C
1983
18.3 C
+0.86 C
1984
19.0 C
+1.56 C
1985
17.9 C
+0.49 C
1986
18.3 C
+0.89 C
1987
18.0 C
+0.62 C
The annual mean temperature here has risen by 0.10 C (0.03 to 0.17) per decade over 1915 to 1987. In Fahrenheit: 0.2 F (0.1 to 0.3) per decade. The slope is a straight line fitted to 65 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Corona
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.10 C (0.03 to 0.17) per decade
0.2 F (0.1 to 0.3) per decade
1915 to 1987
65
Rise
Mean daily maximum
0.05 C (-0.05 to 0.14) per decade
0.1 F (-0.1 to 0.3) per decade
1915 to 1987
65
Not clearly different from zero
Mean daily minimum
0.2 C (0.1 to 0.2) per decade
0.3 F (0.2 to 0.4) per decade
1915 to 1987
65
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
1908 to 1988
Yearly extremes at Corona: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
47.8 C (118.0 F)
1917
41.7 C (107.1 F)
76
Coldest night (TNn)
-7.2 C (19.0 F)
1988
-2.5 C (27.5 F)
76
Wettest day (Rx1day)
128.3 mm (5.1 in)
1927
41.9 mm (1.6 in)
81
Wettest five days (Rx5day)
226.1 mm (8.9 in)
1943
66.1 mm (2.6 in)
81
Longest dry spell (CDD)
223 days
1975
126 days
81
Hottest day (TXx)
The hottest day of the year at Corona, 1908 to 1988. The record is 47.8 C (118.0 F) in 1917, marked on the chart; the median year is 41.7 C (107.1 F).
Hottest day (TXx) at Corona by year
Year
Hottest day (TXx)
1908
n/a
1909
n/a
1910
n/a
1911
n/a
1912
n/a
1913
26.1 C (79.0 F)
1914
40.6 C (105.1 F)
1915
42.8 C (109.0 F)
1916
40.0 C (104.0 F)
1917
47.8 C (118.0 F)
1918
45.0 C (113.0 F)
1919
43.3 C (109.9 F)
1920
41.7 C (107.1 F)
1921
41.1 C (106.0 F)
1922
43.3 C (109.9 F)
1923
44.4 C (111.9 F)
1924
41.1 C (106.0 F)
1925
43.9 C (111.0 F)
1926
42.8 C (109.0 F)
1927
44.4 C (111.9 F)
1928
41.1 C (106.0 F)
1929
43.9 C (111.0 F)
1930
41.7 C (107.1 F)
1931
43.3 C (109.9 F)
1932
40.0 C (104.0 F)
1933
43.3 C (109.9 F)
1934
46.7 C (116.1 F)
1935
40.6 C (105.1 F)
1936
42.8 C (109.0 F)
1937
40.6 C (105.1 F)
1938
42.2 C (108.0 F)
1939
41.7 C (107.1 F)
1940
41.1 C (106.0 F)
1941
39.4 C (102.9 F)
1942
43.3 C (109.9 F)
1943
44.4 C (111.9 F)
1944
42.2 C (108.0 F)
1945
41.1 C (106.0 F)
1946
40.6 C (105.1 F)
1947
42.2 C (108.0 F)
1948
40.0 C (104.0 F)
1949
40.6 C (105.1 F)
1950
39.4 C (102.9 F)
1951
37.2 C (99.0 F)
1952
39.4 C (102.9 F)
1953
41.1 C (106.0 F)
1954
40.6 C (105.1 F)
1955
45.6 C (114.1 F)
1956
42.2 C (108.0 F)
1957
43.3 C (109.9 F)
1958
41.1 C (106.0 F)
1959
41.7 C (107.1 F)
1960
42.2 C (108.0 F)
1961
39.4 C (102.9 F)
1962
38.3 C (100.9 F)
1963
41.7 C (107.1 F)
1964
38.9 C (102.0 F)
1965
40.0 C (104.0 F)
1966
38.9 C (102.0 F)
1967
41.7 C (107.1 F)
1968
40.0 C (104.0 F)
1969
42.2 C (108.0 F)
1970
42.8 C (109.0 F)
1971
44.4 C (111.9 F)
1972
42.2 C (108.0 F)
1973
43.3 C (109.9 F)
1974
38.9 C (102.0 F)
1975
40.6 C (105.1 F)
1976
42.2 C (108.0 F)
1977
43.3 C (109.9 F)
1978
41.1 C (106.0 F)
1979
42.8 C (109.0 F)
1980
41.1 C (106.0 F)
1981
42.8 C (109.0 F)
1982
44.4 C (111.9 F)
1983
42.8 C (109.0 F)
1984
44.4 C (111.9 F)
1985
43.3 C (109.9 F)
1986
39.4 C (102.9 F)
1987
42.2 C (108.0 F)
1988
38.3 C (100.9 F)
Coldest night (TNn)
The coldest night of the year at Corona, 1908 to 1988. The record is -7.2 C (19.0 F) in 1988, marked on the chart; the median year is -2.5 C (27.5 F).
Coldest night (TNn) at Corona by year
Year
Coldest night (TNn)
1908
n/a
1909
n/a
1910
n/a
1911
n/a
1912
n/a
1913
-0.6 C (30.9 F)
1914
0.0 C (32.0 F)
1915
-1.1 C (30.0 F)
1916
-2.2 C (28.0 F)
1917
-1.7 C (28.9 F)
1918
-1.1 C (30.0 F)
1919
-2.2 C (28.0 F)
1920
-1.1 C (30.0 F)
1921
-1.7 C (28.9 F)
1922
-2.2 C (28.0 F)
1923
-2.8 C (27.0 F)
1924
-1.7 C (28.9 F)
1925
-0.6 C (30.9 F)
1926
-2.8 C (27.0 F)
1927
-0.6 C (30.9 F)
1928
-1.1 C (30.0 F)
1929
-2.8 C (27.0 F)
1930
-3.3 C (26.1 F)
1931
-2.8 C (27.0 F)
1932
-3.3 C (26.1 F)
1933
-2.2 C (28.0 F)
1934
-1.1 C (30.0 F)
1935
-2.8 C (27.0 F)
1936
-2.2 C (28.0 F)
1937
-5.6 C (21.9 F)
1938
-1.1 C (30.0 F)
1939
-2.8 C (27.0 F)
1940
-0.6 C (30.9 F)
1941
-2.8 C (27.0 F)
1942
-4.4 C (24.1 F)
1943
-1.7 C (28.9 F)
1944
-2.2 C (28.0 F)
1945
-4.4 C (24.1 F)
1946
-2.8 C (27.0 F)
1947
-2.2 C (28.0 F)
1948
-1.7 C (28.9 F)
1949
-2.2 C (28.0 F)
1950
-3.3 C (26.1 F)
1951
-0.6 C (30.9 F)
1952
-2.2 C (28.0 F)
1953
-5.0 C (23.0 F)
1954
-5.0 C (23.0 F)
1955
-3.3 C (26.1 F)
1956
-3.3 C (26.1 F)
1957
-1.1 C (30.0 F)
1958
-3.3 C (26.1 F)
1959
-1.1 C (30.0 F)
1960
-3.9 C (25.0 F)
1961
-2.8 C (27.0 F)
1962
-3.3 C (26.1 F)
1963
-4.4 C (24.1 F)
1964
-1.7 C (28.9 F)
1965
-2.2 C (28.0 F)
1966
-2.2 C (28.0 F)
1967
-5.6 C (21.9 F)
1968
-5.6 C (21.9 F)
1969
-3.3 C (26.1 F)
1970
-3.3 C (26.1 F)
1971
-3.9 C (25.0 F)
1972
-3.3 C (26.1 F)
1973
-3.9 C (25.0 F)
1974
-2.2 C (28.0 F)
1975
-2.8 C (27.0 F)
1976
-5.0 C (23.0 F)
1977
-1.7 C (28.9 F)
1978
-2.8 C (27.0 F)
1979
-5.0 C (23.0 F)
1980
-0.6 C (30.9 F)
1981
-1.7 C (28.9 F)
1982
-1.7 C (28.9 F)
1983
-1.1 C (30.0 F)
1984
-2.2 C (28.0 F)
1985
-2.8 C (27.0 F)
1986
-2.8 C (27.0 F)
1987
-4.4 C (24.1 F)
1988
-7.2 C (19.0 F)
Wettest day (Rx1day)
The wettest day of the year at Corona, 1908 to 1988. The record is 128.3 mm (5.1 in) in 1927, marked on the chart; the median year is 41.9 mm (1.6 in).
Wettest day (Rx1day) at Corona by year
Year
Wettest day (Rx1day)
1908
15.2 mm (0.6 in)
1909
55.4 mm (2.2 in)
1910
52.1 mm (2.1 in)
1911
27.9 mm (1.1 in)
1912
28.4 mm (1.1 in)
1913
31.0 mm (1.2 in)
1914
84.3 mm (3.3 in)
1915
62.7 mm (2.5 in)
1916
127.0 mm (5.0 in)
1917
24.6 mm (1.0 in)
1918
36.6 mm (1.4 in)
1919
18.0 mm (0.7 in)
1920
34.5 mm (1.4 in)
1921
59.7 mm (2.4 in)
1922
32.5 mm (1.3 in)
1923
24.4 mm (1.0 in)
1924
28.4 mm (1.1 in)
1925
35.3 mm (1.4 in)
1926
109.2 mm (4.3 in)
1927
128.3 mm (5.1 in)
1928
28.7 mm (1.1 in)
1929
26.2 mm (1.0 in)
1930
48.3 mm (1.9 in)
1931
42.7 mm (1.7 in)
1932
43.2 mm (1.7 in)
1933
36.3 mm (1.4 in)
1934
43.2 mm (1.7 in)
1935
30.5 mm (1.2 in)
1936
70.1 mm (2.8 in)
1937
90.2 mm (3.6 in)
1938
109.2 mm (4.3 in)
1939
41.9 mm (1.6 in)
1940
69.9 mm (2.8 in)
1941
36.8 mm (1.4 in)
1942
25.4 mm (1.0 in)
1943
121.9 mm (4.8 in)
1944
53.3 mm (2.1 in)
1945
78.2 mm (3.1 in)
1946
38.9 mm (1.5 in)
1947
17.3 mm (0.7 in)
1948
14.7 mm (0.6 in)
1949
24.9 mm (1.0 in)
1950
42.7 mm (1.7 in)
1951
54.9 mm (2.2 in)
1952
41.9 mm (1.6 in)
1953
14.0 mm (0.6 in)
1954
65.0 mm (2.6 in)
1955
18.0 mm (0.7 in)
1956
80.3 mm (3.2 in)
1957
32.8 mm (1.3 in)
1958
53.6 mm (2.1 in)
1959
38.9 mm (1.5 in)
1960
25.9 mm (1.0 in)
1961
34.3 mm (1.4 in)
1962
50.3 mm (2.0 in)
1963
68.1 mm (2.7 in)
1964
26.2 mm (1.0 in)
1965
56.6 mm (2.2 in)
1966
52.1 mm (2.1 in)
1967
28.2 mm (1.1 in)
1968
55.9 mm (2.2 in)
1969
93.0 mm (3.7 in)
1970
45.7 mm (1.8 in)
1971
39.1 mm (1.5 in)
1972
24.9 mm (1.0 in)
1973
45.7 mm (1.8 in)
1974
57.4 mm (2.3 in)
1975
25.4 mm (1.0 in)
1976
26.7 mm (1.1 in)
1977
42.4 mm (1.7 in)
1978
51.6 mm (2.0 in)
1979
40.6 mm (1.6 in)
1980
53.1 mm (2.1 in)
1981
26.7 mm (1.1 in)
1982
47.5 mm (1.9 in)
1983
54.6 mm (2.1 in)
1984
35.8 mm (1.4 in)
1985
34.8 mm (1.4 in)
1986
46.5 mm (1.8 in)
1987
25.7 mm (1.0 in)
1988
36.8 mm (1.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Corona, 1908 to 1988. The record is 226.1 mm (8.9 in) in 1943, marked on the chart; the median year is 66.1 mm (2.6 in).
Wettest five days (Rx5day) at Corona by year
Year
Wettest five days (Rx5day)
1908
3.3 mm (0.13 in)
1909
3.8 mm (0.15 in)
1910
11.2 mm (0.4 in)
1911
15.2 mm (0.6 in)
1912
7.8 mm (0.31 in)
1913
18.1 mm (0.7 in)
1914
139.7 mm (5.5 in)
1915
71.6 mm (2.8 in)
1916
200.9 mm (7.9 in)
1917
41.1 mm (1.6 in)
1918
108.8 mm (4.3 in)
1919
40.6 mm (1.6 in)
1920
56.4 mm (2.2 in)
1921
188.0 mm (7.4 in)
1922
34.5 mm (1.4 in)
1923
48.8 mm (1.9 in)
1924
39.4 mm (1.6 in)
1925
45.5 mm (1.8 in)
1926
174.5 mm (6.9 in)
1927
217.0 mm (8.5 in)
1928
49.8 mm (2.0 in)
1929
33.0 mm (1.3 in)
1930
69.3 mm (2.7 in)
1931
63.8 mm (2.5 in)
1932
61.0 mm (2.4 in)
1933
78.7 mm (3.1 in)
1934
77.5 mm (3.1 in)
1935
42.5 mm (1.7 in)
1936
138.7 mm (5.5 in)
1937
145.8 mm (5.7 in)
1938
219.7 mm (8.6 in)
1939
50.0 mm (2.0 in)
1940
100.4 mm (4.0 in)
1941
91.9 mm (3.6 in)
1942
34.4 mm (1.4 in)
1943
226.1 mm (8.9 in)
1944
108.8 mm (4.3 in)
1945
104.6 mm (4.1 in)
1946
98.9 mm (3.9 in)
1947
24.2 mm (1.0 in)
1948
21.3 mm (0.8 in)
1949
42.5 mm (1.7 in)
1950
54.9 mm (2.2 in)
1951
96.0 mm (3.8 in)
1952
96.0 mm (3.8 in)
1953
20.1 mm (0.8 in)
1954
85.1 mm (3.4 in)
1955
39.6 mm (1.6 in)
1956
126.7 mm (5.0 in)
1957
45.0 mm (1.8 in)
1958
75.7 mm (3.0 in)
1959
42.0 mm (1.7 in)
1960
36.8 mm (1.4 in)
1961
41.4 mm (1.6 in)
1962
76.5 mm (3.0 in)
1963
77.5 mm (3.1 in)
1964
46.1 mm (1.8 in)
1965
111.7 mm (4.4 in)
1966
156.1 mm (6.1 in)
1967
66.1 mm (2.6 in)
1968
57.7 mm (2.3 in)
1969
163.6 mm (6.4 in)
1970
75.5 mm (3.0 in)
1971
102.1 mm (4.0 in)
1972
47.3 mm (1.9 in)
1973
71.6 mm (2.8 in)
1974
108.0 mm (4.3 in)
1975
56.3 mm (2.2 in)
1976
79.6 mm (3.1 in)
1977
71.6 mm (2.8 in)
1978
141.5 mm (5.6 in)
1979
62.7 mm (2.5 in)
1980
171.7 mm (6.8 in)
1981
41.2 mm (1.6 in)
1982
86.5 mm (3.4 in)
1983
146.0 mm (5.7 in)
1984
75.9 mm (3.0 in)
1985
58.3 mm (2.3 in)
1986
65.6 mm (2.6 in)
1987
35.0 mm (1.4 in)
1988
39.8 mm (1.6 in)
Longest dry spell (CDD)
The longest dry spell of the year at Corona, 1908 to 1988. The record is 223 days in 1975, marked on the chart; the median year is 126 days.
Longest dry spell (CDD) at Corona by year
Year
Longest dry spell (CDD)
1908
22 days
1909
184 days
1910
183 days
1911
85 days
1912
144 days
1913
39 days
1914
115 days
1915
56 days
1916
55 days
1917
36 days
1918
68 days
1919
36 days
1920
116 days
1921
125 days
1922
82 days
1923
60 days
1924
166 days
1925
41 days
1926
151 days
1927
143 days
1928
61 days
1929
104 days
1930
76 days
1931
84 days
1932
156 days
1933
79 days
1934
118 days
1935
114 days
1936
137 days
1937
158 days
1938
166 days
1939
141 days
1940
181 days
1941
163 days
1942
103 days
1943
143 days
1944
191 days
1945
130 days
1946
139 days
1947
181 days
1948
108 days
1949
150 days
1950
193 days
1951
106 days
1952
143 days
1953
190 days
1954
86 days
1955
190 days
1956
75 days
1957
122 days
1958
129 days
1959
185 days
1960
165 days
1961
128 days
1962
219 days
1963
56 days
1964
106 days
1965
72 days
1966
190 days
1967
120 days
1968
80 days
1969
66 days
1970
212 days
1971
140 days
1972
72 days
1973
138 days
1974
153 days
1975
223 days
1976
84 days
1977
121 days
1978
132 days
1979
204 days
1980
207 days
1981
126 days
1982
134 days
1983
107 days
1984
57 days
1985
159 days
1986
164 days
1987
97 days
1988
98 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
53 years with a frost
Across 53 years with a frost, the median last spring frost at Corona falls on 1 March and the median first autumn frost on 6 December, which leaves a median of 286 days between them.
Fitted over all years, the growing season changes by +1.7 days per decade at this station.
Frost dates and growing season at Corona
Measure
Median, all years
Earliest period
Recent period (1949 to 1987)
Recent against earliest
Fitted trend
Last spring frost
1 March
n/a
2 March
n/a
-1.7 days per decade
First autumn frost
6 December
n/a
8 December
n/a
0.0 days per decade
Growing days
286 days
n/a
288 days
n/a
+1.7 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
60 years, 1920 to 1987
A day with at least 42.3 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 132.2 mm (5.2 in) of rain is expected about once in 100 years.
Rainfall return levels at Corona: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
42.3 mm (1.7 in)
5 years
62.2 mm (2.4 in)
10 years
76.9 mm (3.0 in)
25 years
97.4 mm (3.8 in)
50 years
114.2 mm (4.5 in)
100 years
132.2 mm (5.2 in)
Longer than the 60 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, 60 years of values from 1920 to 1987.
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: 121.9 mm (4.8 in) in 1943; 109.2 mm (4.3 in) in 1926; 109.2 mm (4.3 in) in 1938.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Corona, at 1958. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1958 ran 0.3 C (0.5 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Corona, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1958
-0.3
-0.5
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 Corona standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Corona 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.