Riverside Citrus Exp Weather Records (USC00047473)
Record envelope, standing records and threshold days for Riverside Citrus Exp (USC00047473), California, United States, with 62 years of record.
Key Facts for Riverside Citrus Exp
Riverside Citrus Exp (USC00047473) is a weather station in California, United States at 33.97 latitude and -117.36 longitude, 301 m (986 ft) above sea level.
The station reports from 1948 to 2009, 62 years of record.
1,464 records set at Riverside Citrus Exp still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Riverside Citrus Exp tied a daily record high maximum temperature of 42.8 C (109.0 F) on 26 September 2009.
About the Station
Location: California, United States, 33.97 latitude, -117.36 longitude.
Elevation: 301 m (986 ft).
Period of record: 1948 to 2009, 62 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 Riverside Citrus Exp. 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 Riverside Citrus Exp, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
36.1 C (97.0 F)
-4.4 C (24.1 F)
n/a
n/a
Feb
33.3 C (91.9 F)
-2.8 C (27.0 F)
n/a
n/a
Mar
36.7 C (98.1 F)
-1.7 C (28.9 F)
n/a
n/a
Apr
40.0 C (104.0 F)
0.6 C (33.1 F)
n/a
n/a
May
42.2 C (108.0 F)
3.3 C (37.9 F)
n/a
n/a
Jun
44.4 C (111.9 F)
6.7 C (44.1 F)
n/a
n/a
Jul
47.2 C (117.0 F)
9.4 C (48.9 F)
n/a
n/a
Aug
44.4 C (111.9 F)
9.4 C (48.9 F)
n/a
n/a
Sep
45.0 C (113.0 F)
5.6 C (42.1 F)
n/a
n/a
Oct
42.2 C (108.0 F)
0.0 C (32.0 F)
n/a
n/a
Nov
36.7 C (98.1 F)
-3.3 C (26.1 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 Riverside Citrus Exp still stand. 1965 holds the most, with 62.
Standing records at Riverside Citrus Exp by the year they were set
Year set
Standing records
1956
38
1957
31
1958
34
1959
27
1960
42
1961
34
1962
58
1963
27
1964
48
1965
62
1966
28
1967
31
1968
30
1969
32
1970
46
1971
52
1972
31
1973
14
1974
15
1975
20
1976
28
1977
24
1978
19
1979
29
1980
34
1981
27
1982
29
1983
32
1984
26
1985
29
1986
18
1987
35
1988
24
1989
22
1990
13
1991
18
1992
20
1993
19
1994
21
1995
20
1996
21
1997
30
1998
14
1999
20
2000
13
2001
13
2002
16
2003
24
2004
24
2005
10
2006
32
2007
18
2008
28
2009
14
All-Time Record Progression
5 new records
5 all-time records were set at Riverside Citrus Exp between 23 December 1990 and 22 July 2006. Each dot is a new record.
When Riverside Citrus Exp set new all-time records
Date
Kind
Detail
1990-12-23
Record low minimum temperature
Record low minimum temperature -5.6 C (21.9 F)
1994-08-14
Record high minimum temperature
Record high minimum temperature 25.0 C (77.0 F)
1995-01-04
Record daily precipitation
Record daily precipitation 80.3 mm (3.2 in)
2006-07-22
Record high maximum temperature
Record high maximum temperature 47.2 C (117.0 F)
2006-07-22
Record high minimum temperature
Record high minimum temperature 27.2 C (81.0 F)
Wettest Day of Each Month
Jan: 80.3 mm (3.2 in)
The wettest day on record for each calendar month at Riverside Citrus Exp. The most was 80.3 mm (3.2 in) on 4 January 1995.
Record daily precipitation for each month at Riverside Citrus Exp
Month
Record daily precipitation (mm)
Date
Jan
80.3 mm (3.2 in)
4 January 1995
Feb
59.4 mm (2.3 in)
24 February 1969
Mar
51.6 mm (2.0 in)
17 March 1982
Apr
35.3 mm (1.4 in)
20 April 1983
May
18.0 mm (0.7 in)
9 May 1977
Jun
23.1 mm (0.9 in)
5 June 1993
Jul
8.4 mm (0.33 in)
29 July 1968
Aug
30.0 mm (1.2 in)
17 August 1977
Sep
46.7 mm (1.8 in)
11 September 1976
Oct
49.8 mm (2.0 in)
20 October 2004
Nov
63.0 mm (2.5 in)
23 November 1965
Dec
58.9 mm (2.3 in)
6 December 1997
Period of Record Coverage
1956 to 2009
Complete yearUnder 90 percent of days
54 years of record at Riverside Citrus Exp, 1956 to 2009. 1 years have data for under 90 percent of days and are left out of rankings: 2009.
Cooler than the station meanWarmer than the station mean
One stripe for each of 50 complete years at Riverside Citrus Exp, 1956 to 2008. Blue stripes are years cooler than the station's own mean of 18.2 C (64.7 F); red stripes are warmer. The coolest year was 1982, at 16.5 C (61.6 F), and the warmest was 2003, at 19.3 C (66.7 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at Riverside Citrus Exp as warming stripes, 1956 to 2008
Year
Annual mean temperature
Difference from the station mean
1956
17.7 C
-0.49 C
1957
17.8 C
-0.32 C
1958
18.6 C
+0.44 C
1959
19.1 C
+0.91 C
1960
18.0 C
-0.21 C
1961
17.5 C
-0.63 C
1962
17.0 C
-1.21 C
1963
17.5 C
-0.70 C
1964
17.0 C
-1.12 C
1965
16.7 C
-1.48 C
1966
17.5 C
-0.70 C
1967
18.4 C
+0.25 C
1968
17.9 C
-0.28 C
1969
16.9 C
-1.27 C
1970
17.0 C
-1.17 C
1971
17.1 C
-1.07 C
1972
18.1 C
-0.09 C
1973
17.3 C
-0.84 C
1974
18.0 C
-0.19 C
1975
17.7 C
-0.46 C
1976
18.6 C
+0.48 C
1977
18.5 C
+0.32 C
1978
18.2 C
+0.01 C
1979
18.3 C
+0.15 C
1980
18.6 C
+0.46 C
1981
18.9 C
+0.70 C
1982
16.5 C
-1.70 C
1983
18.4 C
+0.23 C
1984
19.2 C
+1.08 C
1985
18.2 C
+0.06 C
1986
18.5 C
+0.29 C
1987
17.7 C
-0.49 C
1988
18.3 C
+0.13 C
1989
18.2 C
+0.02 C
1990
18.4 C
+0.26 C
1991
18.2 C
+0.06 C
1992
18.9 C
+0.75 C
1993
18.4 C
+0.26 C
1994
18.2 C
+0.07 C
1995
18.7 C
+0.49 C
1996
19.1 C
+0.89 C
1997
19.3 C
+1.09 C
1998
18.0 C
-0.15 C
1999
18.2 C
+0.03 C
2002
18.5 C
+0.36 C
2003
19.3 C
+1.09 C
2004
18.9 C
+0.75 C
2005
18.9 C
+0.78 C
2007
19.2 C
+1.05 C
2008
19.2 C
+1.02 C
The annual mean temperature here has risen by 0.3 C (0.2 to 0.4) per decade over 1956 to 2008. In Fahrenheit: 0.5 F (0.3 to 0.7) per decade. The slope is a straight line fitted to 50 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Riverside Citrus Exp
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.3 C (0.2 to 0.4) per decade
0.5 F (0.3 to 0.7) per decade
1956 to 2008
50
Rise
Mean daily maximum
0.13 C (-0.02 to 0.28) per decade
0.24 F (-0.04 to 0.51) per decade
1956 to 2008
50
Not clearly different from zero
Mean daily minimum
0.4 C (0.3 to 0.6) per decade
0.8 F (0.5 to 1.1) per decade
1956 to 2008
50
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
1948 to 2009
Yearly extremes at Riverside Citrus Exp: 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)
2006
42.2 C (108.0 F)
54
Coldest night (TNn)
-5.6 C (21.9 F)
1990
-0.8 C (30.5 F)
54
Wettest day (Rx1day)
80.3 mm (3.2 in)
1995
31.7 mm (1.2 in)
58
Wettest five days (Rx5day)
132.6 mm (5.2 in)
1983
55.7 mm (2.2 in)
58
Longest dry spell (CDD)
220 days
2007
130 days
58
Hottest day (TXx)
The hottest day of the year at Riverside Citrus Exp, 1948 to 2009. The record is 47.2 C (117.0 F) in 2006, marked on the chart; the median year is 42.2 C (108.0 F).
Hottest day (TXx) at Riverside Citrus Exp by year
Year
Hottest day (TXx)
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1956
42.8 C (109.0 F)
1957
42.2 C (108.0 F)
1958
43.3 C (109.9 F)
1959
43.3 C (109.9 F)
1960
45.0 C (113.0 F)
1961
44.4 C (111.9 F)
1962
41.1 C (106.0 F)
1963
42.8 C (109.0 F)
1964
41.1 C (106.0 F)
1965
41.1 C (106.0 F)
1966
40.0 C (104.0 F)
1967
42.8 C (109.0 F)
1968
41.1 C (106.0 F)
1969
41.7 C (107.1 F)
1970
42.8 C (109.0 F)
1971
45.0 C (113.0 F)
1972
41.7 C (107.1 F)
1973
42.8 C (109.0 F)
1974
41.1 C (106.0 F)
1975
41.1 C (106.0 F)
1976
44.4 C (111.9 F)
1977
41.7 C (107.1 F)
1978
42.8 C (109.0 F)
1979
45.0 C (113.0 F)
1980
42.8 C (109.0 F)
1981
43.3 C (109.9 F)
1982
42.2 C (108.0 F)
1983
42.2 C (108.0 F)
1984
42.2 C (108.0 F)
1985
43.9 C (111.0 F)
1986
40.0 C (104.0 F)
1987
41.1 C (106.0 F)
1988
42.8 C (109.0 F)
1989
42.2 C (108.0 F)
1990
42.2 C (108.0 F)
1991
41.1 C (106.0 F)
1992
41.7 C (107.1 F)
1993
41.1 C (106.0 F)
1994
42.8 C (109.0 F)
1995
43.9 C (111.0 F)
1996
41.7 C (107.1 F)
1997
43.3 C (109.9 F)
1998
44.4 C (111.9 F)
1999
40.6 C (105.1 F)
2000
43.3 C (109.9 F)
2001
40.6 C (105.1 F)
2002
44.4 C (111.9 F)
2003
42.2 C (108.0 F)
2004
40.6 C (105.1 F)
2005
41.1 C (106.0 F)
2006
47.2 C (117.0 F)
2007
45.0 C (113.0 F)
2008
41.7 C (107.1 F)
2009
42.8 C (109.0 F)
Coldest night (TNn)
The coldest night of the year at Riverside Citrus Exp, 1948 to 2009. The record is -5.6 C (21.9 F) in 1990, marked on the chart; the median year is -0.8 C (30.5 F).
Coldest night (TNn) at Riverside Citrus Exp by year
Year
Coldest night (TNn)
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1956
-2.8 C (27.0 F)
1957
-1.7 C (28.9 F)
1958
-3.3 C (26.1 F)
1959
0.0 C (32.0 F)
1960
-3.9 C (25.0 F)
1961
-1.1 C (30.0 F)
1962
-2.8 C (27.0 F)
1963
-4.4 C (24.1 F)
1964
-1.1 C (30.0 F)
1965
-2.2 C (28.0 F)
1966
-1.7 C (28.9 F)
1967
-1.1 C (30.0 F)
1968
-5.0 C (23.0 F)
1969
-2.8 C (27.0 F)
1970
-2.8 C (27.0 F)
1971
-1.7 C (28.9 F)
1972
-2.2 C (28.0 F)
1973
-1.7 C (28.9 F)
1974
-1.7 C (28.9 F)
1975
0.6 C (33.1 F)
1976
-1.1 C (30.0 F)
1977
0.6 C (33.1 F)
1978
-2.8 C (27.0 F)
1979
-0.6 C (30.9 F)
1980
1.7 C (35.1 F)
1981
1.1 C (34.0 F)
1982
-0.6 C (30.9 F)
1983
0.0 C (32.0 F)
1984
1.1 C (34.0 F)
1985
-1.1 C (30.0 F)
1986
-0.6 C (30.9 F)
1987
-2.8 C (27.0 F)
1988
-0.6 C (30.9 F)
1989
-1.7 C (28.9 F)
1990
-5.6 C (21.9 F)
1991
0.0 C (32.0 F)
1992
-0.6 C (30.9 F)
1993
-1.1 C (30.0 F)
1994
-0.6 C (30.9 F)
1995
1.1 C (34.0 F)
1996
0.0 C (32.0 F)
1997
0.0 C (32.0 F)
1998
-0.6 C (30.9 F)
1999
1.1 C (34.0 F)
2000
0.0 C (32.0 F)
2001
0.6 C (33.1 F)
2002
0.0 C (32.0 F)
2003
-1.1 C (30.0 F)
2004
-0.6 C (30.9 F)
2005
1.7 C (35.1 F)
2006
0.0 C (32.0 F)
2007
-3.3 C (26.1 F)
2008
0.0 C (32.0 F)
2009
0.6 C (33.1 F)
Wettest day (Rx1day)
The wettest day of the year at Riverside Citrus Exp, 1948 to 2009. The record is 80.3 mm (3.2 in) in 1995, marked on the chart; the median year is 31.7 mm (1.2 in).
Wettest day (Rx1day) at Riverside Citrus Exp by year
Year
Wettest day (Rx1day)
1948
12.4 mm (0.5 in)
1949
30.2 mm (1.2 in)
1950
34.5 mm (1.4 in)
1951
21.3 mm (0.8 in)
1956
50.0 mm (2.0 in)
1957
23.4 mm (0.9 in)
1958
37.3 mm (1.5 in)
1959
18.8 mm (0.7 in)
1960
18.5 mm (0.7 in)
1961
25.4 mm (1.0 in)
1962
31.8 mm (1.3 in)
1963
41.1 mm (1.6 in)
1964
17.8 mm (0.7 in)
1965
63.0 mm (2.5 in)
1966
37.3 mm (1.5 in)
1967
38.6 mm (1.5 in)
1968
43.2 mm (1.7 in)
1969
59.4 mm (2.3 in)
1970
28.4 mm (1.1 in)
1971
31.5 mm (1.2 in)
1972
17.5 mm (0.7 in)
1973
22.6 mm (0.9 in)
1974
44.2 mm (1.7 in)
1975
18.0 mm (0.7 in)
1976
46.7 mm (1.8 in)
1977
30.0 mm (1.2 in)
1978
42.4 mm (1.7 in)
1979
53.8 mm (2.1 in)
1980
40.1 mm (1.6 in)
1981
31.0 mm (1.2 in)
1982
51.6 mm (2.0 in)
1983
44.7 mm (1.8 in)
1984
26.2 mm (1.0 in)
1985
27.7 mm (1.1 in)
1986
20.8 mm (0.8 in)
1987
20.1 mm (0.8 in)
1988
25.7 mm (1.0 in)
1989
15.5 mm (0.6 in)
1990
34.8 mm (1.4 in)
1991
38.1 mm (1.5 in)
1992
48.5 mm (1.9 in)
1993
51.1 mm (2.0 in)
1994
27.9 mm (1.1 in)
1995
80.3 mm (3.2 in)
1996
35.6 mm (1.4 in)
1997
58.9 mm (2.3 in)
1998
38.9 mm (1.5 in)
1999
11.9 mm (0.5 in)
2000
25.1 mm (1.0 in)
2001
30.7 mm (1.2 in)
2002
25.7 mm (1.0 in)
2003
42.9 mm (1.7 in)
2004
49.8 mm (2.0 in)
2005
54.4 mm (2.1 in)
2006
21.6 mm (0.9 in)
2007
49.3 mm (1.9 in)
2008
28.4 mm (1.1 in)
2009
21.8 mm (0.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Riverside Citrus Exp, 1948 to 2009. The record is 132.6 mm (5.2 in) in 1983, marked on the chart; the median year is 55.7 mm (2.2 in).
Wettest five days (Rx5day) at Riverside Citrus Exp by year
Year
Wettest five days (Rx5day)
1948
24.5 mm (1.0 in)
1949
33.7 mm (1.3 in)
1950
51.5 mm (2.0 in)
1951
37.1 mm (1.5 in)
1956
99.8 mm (3.9 in)
1957
45.0 mm (1.8 in)
1958
63.7 mm (2.5 in)
1959
38.9 mm (1.5 in)
1960
42.5 mm (1.7 in)
1961
34.0 mm (1.3 in)
1962
43.0 mm (1.7 in)
1963
87.3 mm (3.4 in)
1964
41.3 mm (1.6 in)
1965
103.7 mm (4.1 in)
1966
131.7 mm (5.2 in)
1967
54.6 mm (2.1 in)
1968
56.7 mm (2.2 in)
1969
107.9 mm (4.2 in)
1970
60.8 mm (2.4 in)
1971
66.8 mm (2.6 in)
1972
39.4 mm (1.6 in)
1973
35.0 mm (1.4 in)
1974
94.5 mm (3.7 in)
1975
44.6 mm (1.8 in)
1976
88.2 mm (3.5 in)
1977
59.0 mm (2.3 in)
1978
104.6 mm (4.1 in)
1979
60.9 mm (2.4 in)
1980
117.8 mm (4.6 in)
1981
52.0 mm (2.0 in)
1982
77.5 mm (3.1 in)
1983
132.6 mm (5.2 in)
1984
53.7 mm (2.1 in)
1985
49.3 mm (1.9 in)
1986
54.3 mm (2.1 in)
1987
34.5 mm (1.4 in)
1988
37.4 mm (1.5 in)
1989
25.4 mm (1.0 in)
1990
49.8 mm (2.0 in)
1991
103.9 mm (4.1 in)
1992
84.3 mm (3.3 in)
1993
106.0 mm (4.2 in)
1994
45.2 mm (1.8 in)
1995
101.7 mm (4.0 in)
1996
63.3 mm (2.5 in)
1997
71.1 mm (2.8 in)
1998
90.7 mm (3.6 in)
1999
22.8 mm (0.9 in)
2000
42.2 mm (1.7 in)
2001
46.8 mm (1.8 in)
2002
42.2 mm (1.7 in)
2003
71.6 mm (2.8 in)
2004
69.1 mm (2.7 in)
2005
109.0 mm (4.3 in)
2006
38.1 mm (1.5 in)
2007
49.8 mm (2.0 in)
2008
59.1 mm (2.3 in)
2009
59.6 mm (2.3 in)
Longest dry spell (CDD)
The longest dry spell of the year at Riverside Citrus Exp, 1948 to 2009. The record is 220 days in 2007, marked on the chart; the median year is 130 days.
Longest dry spell (CDD) at Riverside Citrus Exp by year
Year
Longest dry spell (CDD)
1948
108 days
1949
150 days
1950
108 days
1951
54 days
1956
77 days
1957
101 days
1958
60 days
1959
182 days
1960
127 days
1961
201 days
1962
212 days
1963
55 days
1964
140 days
1965
107 days
1966
188 days
1967
89 days
1968
55 days
1969
183 days
1970
174 days
1971
139 days
1972
120 days
1973
193 days
1974
209 days
1975
163 days
1976
48 days
1977
121 days
1978
133 days
1979
91 days
1980
145 days
1981
126 days
1982
89 days
1983
97 days
1984
57 days
1985
87 days
1986
99 days
1987
103 days
1988
204 days
1989
124 days
1990
171 days
1991
125 days
1992
102 days
1993
126 days
1994
138 days
1995
149 days
1996
194 days
1997
198 days
1998
76 days
1999
158 days
2000
152 days
2001
116 days
2002
182 days
2003
94 days
2004
182 days
2005
136 days
2006
149 days
2007
220 days
2008
162 days
2009
192 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
21 years with a frost
Across 21 years with a frost, the median last spring frost at Riverside Citrus Exp falls on 13 February and the median first autumn frost on 9 December, which leaves a median of 294 days between them.
Frost dates and growing season at Riverside Citrus Exp
Measure
Median, all years
Earliest period
Recent period (1956 to 2004)
Recent against earliest
Fitted trend
Last spring frost
13 February
n/a
13 February
n/a
n/a
First autumn frost
9 December
n/a
9 December
n/a
n/a
Growing days
294 days
n/a
294 days
n/a
n/a
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
55 years, 1949 to 2008
A day with at least 33.9 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 76.7 mm (3.0 in) of rain is expected about once in 100 years.
Rainfall return levels at Riverside Citrus Exp: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
33.9 mm (1.3 in)
5 years
46.8 mm (1.8 in)
10 years
54.7 mm (2.2 in)
25 years
64.1 mm (2.5 in)
50 years
70.6 mm (2.8 in)
100 years
76.7 mm (3.0 in)
Longer than the 55 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, 55 years of values from 1949 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: 80.3 mm (3.2 in) in 1995; 63.0 mm (2.5 in) in 1965; 59.4 mm (2.3 in) in 1969.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Riverside Citrus Exp, at 1981. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1981 ran 0.3 C (0.5 F) lower than in the years before (possible change).
Suspected changes in the annual mean temperature at Riverside Citrus Exp, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1981
-0.3
-0.5
possible
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 Riverside Citrus Exp standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Riverside Citrus Exp 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.