Record envelope, standing records and threshold days for Jess Valley (USC00044374), California, United States, with 79 years of record.
Key Facts for Jess Valley
Jess Valley (USC00044374) is a weather station in California, United States at 41.27 latitude and -120.30 longitude, 1,621 m (5,319 ft) above sea level.
The station reports from 1948 to 2026, 79 years of record.
1,464 records set at Jess Valley still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Jess Valley set a daily record precipitation of 15.5 mm (0.6 in) on 27 June 2026.
About the Station
Location: California, United States, 41.27 latitude, -120.30 longitude.
Elevation: 1,621 m (5,319 ft).
Period of record: 1948 to 2026, 79 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
13 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 Jess Valley. The lines show the 2026 daily maximum and minimum. 13 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Jess Valley, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
20.6 C (69.1 F)
-36.1 C (-33.0 F)
19.4 C (66.9 F)
-13.3 C (8.1 F)
Feb
22.2 C (72.0 F)
-33.3 C (-27.9 F)
22.2 C (72.0 F)
-7.8 C (18.0 F)
Mar
26.1 C (79.0 F)
-21.7 C (-7.1 F)
26.1 C (79.0 F)
-2.8 C (27.0 F)
Apr
27.2 C (81.0 F)
-15.0 C (5.0 F)
20.6 C (69.1 F)
-6.1 C (21.0 F)
May
31.7 C (89.1 F)
-9.4 C (15.1 F)
27.8 C (82.0 F)
-0.6 C (30.9 F)
Jun
35.6 C (96.1 F)
-7.8 C (18.0 F)
n/a
n/a
Jul
38.9 C (102.0 F)
-7.2 C (19.0 F)
n/a
n/a
Aug
40.6 C (105.1 F)
-2.8 C (27.0 F)
n/a
n/a
Sep
36.1 C (97.0 F)
-7.8 C (18.0 F)
25.0 C (77.0 F)
-1.1 C (30.0 F)
Oct
32.8 C (91.0 F)
-16.1 C (3.0 F)
27.2 C (81.0 F)
6.1 C (43.0 F)
Nov
25.6 C (78.1 F)
-22.2 C (-8.0 F)
n/a
n/a
Dec
19.4 C (66.9 F)
-33.3 C (-27.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Jess Valley still stand. 1985 holds the most, with 54.
Standing records at Jess Valley by the year they were set
Year set
Standing records
1948
14
1949
21
1950
25
1951
11
1952
20
1953
13
1954
20
1955
18
1956
27
1957
16
1958
16
1959
23
1960
20
1961
24
1962
24
1963
27
1964
27
1965
17
1966
17
1967
22
1968
17
1969
13
1970
17
1971
27
1972
27
1973
11
1974
18
1975
16
1976
17
1977
16
1978
16
1979
17
1980
18
1981
16
1982
36
1983
28
1984
25
1985
54
1986
21
1987
28
1988
20
1989
18
1990
37
1991
13
1992
25
1993
20
1994
21
1995
26
1996
23
1997
6
1998
17
1999
11
2000
9
2001
8
2002
22
2003
30
2004
12
2005
10
2006
11
2007
11
2008
28
2009
12
2010
19
2011
13
2012
15
2013
16
2014
10
2015
26
2016
12
2017
19
2018
9
2019
5
2022
8
2023
20
2024
31
2025
3
2026
28
All-Time Record Progression
6 new records
6 all-time records were set at Jess Valley between 29 August 1985 and 7 September 2022. Each dot is a new record.
When Jess Valley set new all-time records
Date
Kind
Detail
1985-08-29
Record high minimum temperature
Record high minimum temperature 19.4 C (66.9 F)
1989-01-09
Record snow depth
Record snow depth 63.5 cm (25.0 in)
1989-01-10
Record snow depth
Record snow depth 68.6 cm (27.0 in)
1989-02-05
Record low maximum temperature
Record low maximum temperature -13.9 C (7.0 F)
1993-06-06
Record daily precipitation
Record daily precipitation 71.9 mm (2.8 in)
2022-09-07
Record high minimum temperature
Record high minimum temperature 20.0 C (68.0 F)
Wettest Day of Each Month
Jun: 71.9 mm (2.8 in)
The wettest day on record for each calendar month at Jess Valley. The most was 71.9 mm (2.8 in) on 6 June 1993.
Record daily precipitation for each month at Jess Valley
Month
Record daily precipitation (mm)
Date
Jan
36.6 mm (1.4 in)
20 January 1969
Feb
34.5 mm (1.4 in)
17 February 1986
Mar
42.7 mm (1.7 in)
8 March 1986
Apr
52.1 mm (2.1 in)
29 April 1995
May
52.3 mm (2.1 in)
7 May 2005
Jun
71.9 mm (2.8 in)
6 June 1993
Jul
36.3 mm (1.4 in)
30 July 1960
Aug
31.2 mm (1.2 in)
5 August 1974
Sep
45.7 mm (1.8 in)
30 September 1983
Oct
66.8 mm (2.6 in)
13 October 1962
Nov
41.9 mm (1.6 in)
14 November 1957
Dec
33.0 mm (1.3 in)
14 December 1983
Period of Record Coverage
1948 to 2026
Complete yearUnder 90 percent of days
78 years of record at Jess Valley, 1948 to 2026. 16 years have data for under 90 percent of days and are left out of rankings: 1948, 1973, 1992, 1996, 2005, 2006, 2008, 2009 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 45 complete years at Jess Valley, 1950 to 2017. Blue stripes are years cooler than the station's own mean of 7.7 C (45.8 F); red stripes are warmer. The coolest year was 1982, at 4.7 C (40.4 F), and the warmest was 2014, at 9.0 C (48.2 F). The strongest colour marks a difference of 3.0 C (5.4 F).
Annual mean temperature at Jess Valley as warming stripes, 1950 to 2017
Year
Annual mean temperature
Difference from the station mean
1950
8.0 C
+0.33 C
1951
7.3 C
-0.35 C
1952
6.9 C
-0.76 C
1953
7.2 C
-0.53 C
1955
7.1 C
-0.64 C
1956
7.8 C
+0.07 C
1957
7.6 C
-0.10 C
1958
8.9 C
+1.25 C
1959
8.7 C
+1.00 C
1960
8.2 C
+0.47 C
1962
8.0 C
+0.32 C
1963
8.2 C
+0.47 C
1964
7.0 C
-0.69 C
1965
7.9 C
+0.21 C
1966
8.4 C
+0.74 C
1967
7.9 C
+0.25 C
1968
8.0 C
+0.26 C
1969
7.8 C
+0.10 C
1970
7.8 C
+0.11 C
1971
7.1 C
-0.57 C
1975
7.0 C
-0.69 C
1976
8.1 C
+0.39 C
1978
7.4 C
-0.27 C
1979
7.5 C
-0.19 C
1980
8.2 C
+0.51 C
1981
8.2 C
+0.52 C
1982
4.7 C
-3.00 C
1983
5.9 C
-1.80 C
1984
5.9 C
-1.77 C
1985
5.5 C
-2.16 C
1986
8.6 C
+0.90 C
1987
8.8 C
+1.06 C
1988
8.8 C
+1.06 C
1989
7.7 C
+0.03 C
1990
8.0 C
+0.34 C
1991
8.5 C
+0.85 C
1993
7.3 C
-0.44 C
1994
7.7 C
-0.02 C
2009
8.2 C
+0.49 C
2010
7.7 C
-0.02 C
2012
8.2 C
+0.46 C
2013
7.4 C
-0.33 C
2014
9.0 C
+1.29 C
2016
8.1 C
+0.39 C
2017
8.1 C
+0.45 C
The fitted trend in annual mean temperature here over 1950 to 2017 is 0.04 C (-0.10 to 0.18) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.2 to 0.3) per decade. The slope is a straight line fitted to 45 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Jess Valley
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.04 C (-0.10 to 0.18) per decade
0.1 F (-0.2 to 0.3) per decade
1950 to 2017
45
Not clearly different from zero
Mean daily maximum
0.1 C (-0.1 to 0.3) per decade
0.2 F (-0.1 to 0.6) per decade
1950 to 2017
45
Not clearly different from zero
Mean daily minimum
-0.04 C (-0.16 to 0.08) per decade
-0.1 F (-0.3 to 0.1) per decade
1950 to 2017
45
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
1948 to 2026
Yearly extremes at Jess Valley: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
40.6 C (105.1 F)
1972
34.4 C (93.9 F)
78
Coldest night (TNn)
-36.1 C (-33.0 F)
1962
-20.0 C (-4.0 F)
78
Wettest day (Rx1day)
71.9 mm (2.8 in)
1993
30.4 mm (1.2 in)
78
Wettest five days (Rx5day)
145.4 mm (5.7 in)
1962
49.6 mm (2.0 in)
77
Longest dry spell (CDD)
99 days
1957
44 days
78
Hottest day (TXx)
The hottest day of the year at Jess Valley, 1948 to 2026. The record is 40.6 C (105.1 F) in 1972, marked on the chart; the median year is 34.4 C (93.9 F).
Hottest day (TXx) at Jess Valley by year
Year
Hottest day (TXx)
1948
27.8 C (82.0 F)
1949
32.2 C (90.0 F)
1950
33.3 C (91.9 F)
1951
32.8 C (91.0 F)
1952
30.6 C (87.1 F)
1953
32.2 C (90.0 F)
1954
31.7 C (89.1 F)
1955
33.3 C (91.9 F)
1956
30.6 C (87.1 F)
1957
29.4 C (84.9 F)
1958
30.6 C (87.1 F)
1959
36.1 C (97.0 F)
1960
37.8 C (100.0 F)
1961
36.7 C (98.1 F)
1962
33.3 C (91.9 F)
1963
33.3 C (91.9 F)
1964
33.9 C (93.0 F)
1965
32.2 C (90.0 F)
1966
35.6 C (96.1 F)
1967
35.0 C (95.0 F)
1968
35.0 C (95.0 F)
1969
34.4 C (93.9 F)
1970
35.6 C (96.1 F)
1971
35.6 C (96.1 F)
1972
40.6 C (105.1 F)
1973
33.9 C (93.0 F)
1974
34.4 C (93.9 F)
1975
35.0 C (95.0 F)
1976
33.9 C (93.0 F)
1977
35.0 C (95.0 F)
1978
36.1 C (97.0 F)
1979
36.7 C (98.1 F)
1980
35.0 C (95.0 F)
1981
34.4 C (93.9 F)
1982
30.6 C (87.1 F)
1983
35.0 C (95.0 F)
1984
31.7 C (89.1 F)
1985
32.8 C (91.0 F)
1986
32.8 C (91.0 F)
1987
35.6 C (96.1 F)
1988
36.7 C (98.1 F)
1989
32.8 C (91.0 F)
1990
35.6 C (96.1 F)
1991
32.8 C (91.0 F)
1992
34.4 C (93.9 F)
1993
33.9 C (93.0 F)
1994
33.9 C (93.0 F)
1995
31.7 C (89.1 F)
1996
33.3 C (91.9 F)
1997
34.4 C (93.9 F)
1998
35.6 C (96.1 F)
1999
35.0 C (95.0 F)
2000
35.0 C (95.0 F)
2001
35.0 C (95.0 F)
2002
38.9 C (102.0 F)
2003
36.7 C (98.1 F)
2004
35.0 C (95.0 F)
2005
35.0 C (95.0 F)
2006
35.6 C (96.1 F)
2007
37.2 C (99.0 F)
2008
36.1 C (97.0 F)
2009
33.9 C (93.0 F)
2010
33.9 C (93.0 F)
2011
33.3 C (91.9 F)
2012
35.0 C (95.0 F)
2013
35.6 C (96.1 F)
2014
36.1 C (97.0 F)
2015
35.6 C (96.1 F)
2016
36.1 C (97.0 F)
2017
36.1 C (97.0 F)
2018
36.7 C (98.1 F)
2019
31.7 C (89.1 F)
2020
15.6 C (60.1 F)
2022
36.1 C (97.0 F)
2023
33.9 C (93.0 F)
2024
35.0 C (95.0 F)
2025
30.6 C (87.1 F)
2026
27.8 C (82.0 F)
Coldest night (TNn)
The coldest night of the year at Jess Valley, 1948 to 2026. The record is -36.1 C (-33.0 F) in 1962, marked on the chart; the median year is -20.0 C (-4.0 F).
Coldest night (TNn) at Jess Valley by year
Year
Coldest night (TNn)
1948
-23.3 C (-9.9 F)
1949
-30.6 C (-23.1 F)
1950
-25.0 C (-13.0 F)
1951
-21.1 C (-6.0 F)
1952
-22.2 C (-8.0 F)
1953
-17.2 C (1.0 F)
1954
-22.8 C (-9.0 F)
1955
-21.1 C (-6.0 F)
1956
-23.3 C (-9.9 F)
1957
-27.2 C (-17.0 F)
1958
-17.2 C (1.0 F)
1959
-18.9 C (-2.0 F)
1960
-26.7 C (-16.1 F)
1961
-15.6 C (3.9 F)
1962
-36.1 C (-33.0 F)
1963
-21.7 C (-7.1 F)
1964
-18.3 C (-0.9 F)
1965
-18.3 C (-0.9 F)
1966
-20.6 C (-5.1 F)
1967
-20.6 C (-5.1 F)
1968
-22.8 C (-9.0 F)
1969
-18.9 C (-2.0 F)
1970
-23.3 C (-9.9 F)
1971
-25.6 C (-14.1 F)
1972
-33.3 C (-27.9 F)
1973
-17.2 C (1.0 F)
1974
-24.4 C (-11.9 F)
1975
-21.1 C (-6.0 F)
1976
-18.3 C (-0.9 F)
1977
-25.6 C (-14.1 F)
1978
-21.1 C (-6.0 F)
1979
-25.0 C (-13.0 F)
1980
-15.6 C (3.9 F)
1981
-18.3 C (-0.9 F)
1982
-22.2 C (-8.0 F)
1983
-20.0 C (-4.0 F)
1984
-20.0 C (-4.0 F)
1985
-22.8 C (-9.0 F)
1986
-15.6 C (3.9 F)
1987
-19.4 C (-2.9 F)
1988
-22.2 C (-8.0 F)
1989
-30.0 C (-22.0 F)
1990
-33.3 C (-27.9 F)
1991
-14.4 C (6.1 F)
1992
-20.0 C (-4.0 F)
1993
-20.0 C (-4.0 F)
1994
-19.4 C (-2.9 F)
1995
-14.4 C (6.1 F)
1996
-21.1 C (-6.0 F)
1997
-17.8 C (0.0 F)
1998
-25.6 C (-14.1 F)
1999
-15.6 C (3.9 F)
2000
-13.3 C (8.1 F)
2001
-16.1 C (3.0 F)
2002
-18.3 C (-0.9 F)
2003
-12.2 C (10.0 F)
2004
-17.8 C (0.0 F)
2005
-13.9 C (7.0 F)
2006
-18.3 C (-0.9 F)
2007
-19.4 C (-2.9 F)
2008
-20.0 C (-4.0 F)
2009
-20.0 C (-4.0 F)
2010
-22.2 C (-8.0 F)
2011
-20.0 C (-4.0 F)
2012
-20.0 C (-4.0 F)
2013
-25.0 C (-13.0 F)
2014
-17.8 C (0.0 F)
2015
-21.1 C (-6.0 F)
2016
-18.9 C (-2.0 F)
2017
-24.4 C (-11.9 F)
2018
-18.9 C (-2.0 F)
2019
-17.8 C (0.0 F)
2020
-7.8 C (18.0 F)
2022
-17.8 C (0.0 F)
2023
-22.8 C (-9.0 F)
2024
-17.2 C (1.0 F)
2025
-10.0 C (14.0 F)
2026
-13.3 C (8.1 F)
Wettest day (Rx1day)
The wettest day of the year at Jess Valley, 1948 to 2026. The record is 71.9 mm (2.8 in) in 1993, marked on the chart; the median year is 30.4 mm (1.2 in).
Wettest day (Rx1day) at Jess Valley by year
Year
Wettest day (Rx1day)
1948
15.2 mm (0.6 in)
1949
26.9 mm (1.1 in)
1950
37.3 mm (1.5 in)
1951
32.0 mm (1.3 in)
1952
41.9 mm (1.6 in)
1953
24.1 mm (0.9 in)
1954
24.1 mm (0.9 in)
1955
28.4 mm (1.1 in)
1956
23.4 mm (0.9 in)
1957
41.9 mm (1.6 in)
1958
30.7 mm (1.2 in)
1959
12.7 mm (0.5 in)
1960
36.3 mm (1.4 in)
1961
22.1 mm (0.9 in)
1962
66.8 mm (2.6 in)
1963
27.2 mm (1.1 in)
1964
27.9 mm (1.1 in)
1965
27.7 mm (1.1 in)
1966
16.8 mm (0.7 in)
1967
20.3 mm (0.8 in)
1968
30.0 mm (1.2 in)
1969
36.6 mm (1.4 in)
1970
21.6 mm (0.9 in)
1971
39.4 mm (1.6 in)
1972
16.3 mm (0.6 in)
1973
22.9 mm (0.9 in)
1974
31.2 mm (1.2 in)
1975
30.2 mm (1.2 in)
1976
39.4 mm (1.6 in)
1977
33.3 mm (1.3 in)
1978
46.7 mm (1.8 in)
1979
22.9 mm (0.9 in)
1980
27.9 mm (1.1 in)
1981
31.5 mm (1.2 in)
1982
22.1 mm (0.9 in)
1983
45.7 mm (1.8 in)
1984
22.9 mm (0.9 in)
1985
34.8 mm (1.4 in)
1986
42.7 mm (1.7 in)
1987
52.1 mm (2.1 in)
1988
35.6 mm (1.4 in)
1989
53.3 mm (2.1 in)
1990
22.4 mm (0.9 in)
1991
42.4 mm (1.7 in)
1992
25.4 mm (1.0 in)
1993
71.9 mm (2.8 in)
1994
26.7 mm (1.1 in)
1995
52.1 mm (2.1 in)
1996
39.4 mm (1.6 in)
1997
17.0 mm (0.7 in)
1998
30.5 mm (1.2 in)
1999
22.1 mm (0.9 in)
2000
40.9 mm (1.6 in)
2001
19.1 mm (0.8 in)
2002
33.3 mm (1.3 in)
2003
30.7 mm (1.2 in)
2004
21.6 mm (0.9 in)
2005
52.3 mm (2.1 in)
2006
19.8 mm (0.8 in)
2007
27.2 mm (1.1 in)
2008
36.8 mm (1.4 in)
2009
34.5 mm (1.4 in)
2010
27.9 mm (1.1 in)
2011
36.1 mm (1.4 in)
2012
17.8 mm (0.7 in)
2013
32.0 mm (1.3 in)
2014
32.5 mm (1.3 in)
2015
32.0 mm (1.3 in)
2016
29.2 mm (1.1 in)
2017
31.8 mm (1.3 in)
2018
33.0 mm (1.3 in)
2019
21.8 mm (0.9 in)
2020
9.7 mm (0.38 in)
2022
19.6 mm (0.8 in)
2023
30.5 mm (1.2 in)
2024
24.1 mm (0.9 in)
2025
31.8 mm (1.3 in)
2026
24.1 mm (0.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Jess Valley, 1948 to 2026. The record is 145.4 mm (5.7 in) in 1962, marked on the chart; the median year is 49.6 mm (2.0 in).
Wettest five days (Rx5day) at Jess Valley by year
Year
Wettest five days (Rx5day)
1948
25.4 mm (1.0 in)
1949
44.0 mm (1.7 in)
1950
37.3 mm (1.5 in)
1951
43.6 mm (1.7 in)
1952
60.5 mm (2.4 in)
1953
44.7 mm (1.8 in)
1954
38.6 mm (1.5 in)
1955
36.1 mm (1.4 in)
1956
47.5 mm (1.9 in)
1957
77.2 mm (3.0 in)
1958
47.2 mm (1.9 in)
1959
22.3 mm (0.9 in)
1960
42.5 mm (1.7 in)
1961
31.5 mm (1.2 in)
1962
145.4 mm (5.7 in)
1963
52.8 mm (2.1 in)
1964
85.3 mm (3.4 in)
1965
69.9 mm (2.8 in)
1966
26.2 mm (1.0 in)
1967
49.3 mm (1.9 in)
1968
58.0 mm (2.3 in)
1969
70.5 mm (2.8 in)
1970
50.8 mm (2.0 in)
1971
92.8 mm (3.7 in)
1972
40.0 mm (1.6 in)
1973
36.6 mm (1.4 in)
1974
38.4 mm (1.5 in)
1975
43.9 mm (1.7 in)
1976
58.9 mm (2.3 in)
1977
51.4 mm (2.0 in)
1978
67.5 mm (2.7 in)
1979
30.0 mm (1.2 in)
1980
76.2 mm (3.0 in)
1981
50.5 mm (2.0 in)
1982
41.1 mm (1.6 in)
1983
78.9 mm (3.1 in)
1984
52.4 mm (2.1 in)
1985
36.6 mm (1.4 in)
1986
82.7 mm (3.3 in)
1987
77.0 mm (3.0 in)
1988
69.4 mm (2.7 in)
1989
55.7 mm (2.2 in)
1990
48.7 mm (1.9 in)
1991
69.8 mm (2.7 in)
1992
62.5 mm (2.5 in)
1993
97.6 mm (3.8 in)
1994
73.5 mm (2.9 in)
1995
72.6 mm (2.9 in)
1996
65.0 mm (2.6 in)
1997
31.0 mm (1.2 in)
1998
74.1 mm (2.9 in)
1999
37.9 mm (1.5 in)
2000
54.8 mm (2.2 in)
2001
25.5 mm (1.0 in)
2002
44.5 mm (1.8 in)
2003
49.0 mm (1.9 in)
2004
32.6 mm (1.3 in)
2005
108.0 mm (4.3 in)
2006
49.6 mm (2.0 in)
2007
44.3 mm (1.7 in)
2008
27.9 mm (1.1 in)
2009
66.5 mm (2.6 in)
2010
71.0 mm (2.8 in)
2011
66.3 mm (2.6 in)
2012
36.0 mm (1.4 in)
2013
41.7 mm (1.6 in)
2014
52.3 mm (2.1 in)
2015
84.4 mm (3.3 in)
2016
51.1 mm (2.0 in)
2017
65.3 mm (2.6 in)
2018
51.3 mm (2.0 in)
2019
35.9 mm (1.4 in)
2020
n/a
2022
41.9 mm (1.6 in)
2023
47.7 mm (1.9 in)
2024
32.3 mm (1.3 in)
2025
44.5 mm (1.8 in)
2026
40.6 mm (1.6 in)
Longest dry spell (CDD)
The longest dry spell of the year at Jess Valley, 1948 to 2026. The record is 99 days in 1957, marked on the chart; the median year is 44 days.
Longest dry spell (CDD) at Jess Valley by year
Year
Longest dry spell (CDD)
1948
39 days
1949
69 days
1950
38 days
1951
75 days
1952
37 days
1953
51 days
1954
56 days
1955
60 days
1956
29 days
1957
99 days
1958
24 days
1959
50 days
1960
49 days
1961
41 days
1962
71 days
1963
40 days
1964
57 days
1965
42 days
1966
27 days
1967
31 days
1968
49 days
1969
72 days
1970
45 days
1971
35 days
1972
44 days
1973
69 days
1974
57 days
1975
43 days
1976
42 days
1977
29 days
1978
54 days
1979
38 days
1980
25 days
1981
71 days
1982
72 days
1983
42 days
1984
36 days
1985
37 days
1986
64 days
1987
53 days
1988
39 days
1989
47 days
1990
67 days
1991
47 days
1992
33 days
1993
57 days
1994
45 days
1995
90 days
1996
46 days
1997
23 days
1998
26 days
1999
58 days
2000
32 days
2001
54 days
2002
77 days
2003
43 days
2004
44 days
2005
40 days
2006
78 days
2007
85 days
2008
48 days
2009
40 days
2010
56 days
2011
37 days
2012
60 days
2013
29 days
2014
36 days
2015
27 days
2016
69 days
2017
41 days
2018
17 days
2019
28 days
2020
2 days
2022
28 days
2023
44 days
2024
23 days
2025
11 days
2026
65 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
45 years with a frost
Across 45 years with a frost, the median last spring frost at Jess Valley falls on 22 June and the median first autumn frost on 10 September, which leaves a median of 84 days between them.
Fitted over all years, the growing season changes by +0.3 days per decade at this station.
Frost dates and growing season at Jess Valley
Measure
Median, all years
Earliest period
Recent period (1967 to 2017)
Recent against earliest
Fitted trend
Last spring frost
22 June
n/a
22 June
n/a
-0.4 days per decade
First autumn frost
10 September
n/a
5 September
n/a
-0.2 days per decade
Growing days
84 days
n/a
82 days
n/a
+0.3 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
68 years, 1949 to 2017
A day with at least 30.0 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 69.5 mm (2.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Jess Valley: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
30.0 mm (1.2 in)
5 years
40.0 mm (1.6 in)
10 years
46.9 mm (1.8 in)
25 years
55.8 mm (2.2 in)
50 years
62.6 mm (2.5 in)
100 years
69.5 mm (2.7 in)
Longer than the 68 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, 68 years of values from 1949 to 2017.
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: 71.9 mm (2.8 in) in 1993; 66.8 mm (2.6 in) in 1962; 53.3 mm (2.1 in) in 1989.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Jess Valley, at 1978. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1978 ran 0.5 C (0.9 F) lower than in the years before (possible change).
Suspected changes in the annual mean temperature at Jess Valley, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1978
-0.5
-0.9
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 Jess Valley standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Jess Valley 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.