Record envelope, standing records and threshold days for Long Valley (USC00285003), New Jersey, United States, with 76 years of record.
Key Facts for Long Valley
Long Valley (USC00285003) is a weather station in New Jersey, United States at 40.79 latitude and -74.78 longitude, 168 m (550 ft) above sea level.
The station reports from 1929 to 2004, 76 years of record.
1,464 records set at Long Valley still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Long Valley tied a daily record low maximum temperature of 17.8 C (64.0 F) on 8 August 2004.
About the Station
Location: New Jersey, United States, 40.79 latitude, -74.78 longitude.
Elevation: 168 m (550 ft).
Period of record: 1929 to 2004, 76 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 Long Valley. 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 Long Valley, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
21.7 C (71.1 F)
-30.6 C (-23.1 F)
n/a
n/a
Feb
24.4 C (75.9 F)
-31.1 C (-24.0 F)
n/a
n/a
Mar
29.4 C (84.9 F)
-20.0 C (-4.0 F)
n/a
n/a
Apr
33.9 C (93.0 F)
-12.8 C (9.0 F)
n/a
n/a
May
35.6 C (96.1 F)
-3.3 C (26.1 F)
n/a
n/a
Jun
36.7 C (98.1 F)
0.6 C (33.1 F)
n/a
n/a
Jul
37.8 C (100.0 F)
3.3 C (37.9 F)
n/a
n/a
Aug
37.8 C (100.0 F)
1.7 C (35.1 F)
n/a
n/a
Sep
38.9 C (102.0 F)
-3.9 C (25.0 F)
n/a
n/a
Oct
32.8 C (91.0 F)
-7.8 C (18.0 F)
n/a
n/a
Nov
27.8 C (82.0 F)
-15.6 C (3.9 F)
n/a
n/a
Dec
22.8 C (73.0 F)
-25.0 C (-13.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Long Valley still stand. 1979 holds the most, with 42.
Standing records at Long Valley by the year they were set
Year set
Standing records
1930
21
1931
8
1932
16
1933
23
1934
26
1935
14
1936
4
1937
22
1938
18
1939
19
1940
31
1941
19
1942
26
1943
25
1944
25
1945
24
1946
12
1947
21
1948
17
1949
30
1950
23
1951
19
1952
18
1953
29
1954
20
1955
25
1956
23
1957
33
1958
14
1959
15
1960
19
1961
19
1962
20
1963
21
1964
31
1965
13
1966
23
1967
27
1968
19
1969
9
1970
9
1971
12
1972
20
1973
15
1974
18
1975
14
1976
25
1977
21
1978
23
1979
42
1980
10
1981
14
1982
20
1983
19
1984
23
1985
12
1986
15
1987
13
1988
24
1989
15
1990
32
1991
17
1992
16
1993
14
1994
15
1995
9
1996
23
1997
5
1998
25
1999
21
2000
21
2001
17
2002
35
2003
19
2004
10
All-Time Record Progression
2 new records
2 all-time records were set at Long Valley between 18 January 1982 and 8 January 1996. Each dot is a new record.
When Long Valley set new all-time records
Date
Kind
Detail
1982-01-18
Record low maximum temperature
Record low maximum temperature -17.2 C (1.0 F)
1996-01-08
Record daily snowfall
Record daily snowfall 58.4 cm (23.0 in)
Wettest Day of Each Month
Jul: 158.0 mm (6.2 in)
The wettest day on record for each calendar month at Long Valley. The most was 158.0 mm (6.2 in) on 28 July 1951.
Record daily precipitation for each month at Long Valley
Month
Record daily precipitation (mm)
Date
Jan
85.9 mm (3.4 in)
25 January 1979
Feb
59.7 mm (2.4 in)
8 February 1965
Mar
82.8 mm (3.3 in)
23 March 1977
Apr
77.5 mm (3.1 in)
16 April 1983
May
85.1 mm (3.4 in)
30 May 1984
Jun
99.6 mm (3.9 in)
1 June 1972
Jul
158.0 mm (6.2 in)
28 July 1951
Aug
149.9 mm (5.9 in)
28 August 1971
Sep
141.5 mm (5.6 in)
20 September 1989
Oct
156.5 mm (6.2 in)
20 October 1996
Nov
125.7 mm (4.9 in)
9 November 1972
Dec
73.4 mm (2.9 in)
2 December 1996
Period of Record Coverage
1929 to 2004
Complete yearUnder 90 percent of days
76 years of record at Long Valley, 1929 to 2004. 12 years have data for under 90 percent of days and are left out of rankings: 1929, 1930, 1931, 1932, 1935, 1936, 1938, 1939 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 56 complete years at Long Valley, 1933 to 2003. Blue stripes are years cooler than the station's own mean of 9.5 C (49.1 F); red stripes are warmer. The coolest year was 1978, at 7.3 C (45.1 F), and the warmest was 1959, at 10.9 C (51.6 F). The strongest colour marks a difference of 2.3 C (4.1 F).
Annual mean temperature at Long Valley as warming stripes, 1933 to 2003
Year
Annual mean temperature
Difference from the station mean
1933
10.4 C
+0.86 C
1934
9.3 C
-0.18 C
1937
10.0 C
+0.51 C
1940
8.5 C
-1.00 C
1941
9.9 C
+0.38 C
1942
9.6 C
+0.08 C
1943
8.8 C
-0.68 C
1944
9.3 C
-0.23 C
1946
10.5 C
+0.98 C
1947
9.6 C
+0.09 C
1948
9.5 C
-0.04 C
1949
10.9 C
+1.38 C
1951
10.0 C
+0.55 C
1952
10.1 C
+0.64 C
1953
10.5 C
+1.02 C
1954
9.7 C
+0.19 C
1955
10.6 C
+1.07 C
1956
10.0 C
+0.50 C
1957
10.7 C
+1.22 C
1958
9.4 C
-0.10 C
1959
10.9 C
+1.42 C
1960
9.7 C
+0.23 C
1961
10.0 C
+0.53 C
1964
9.5 C
-0.01 C
1966
9.2 C
-0.32 C
1967
8.8 C
-0.70 C
1968
8.4 C
-1.07 C
1970
8.9 C
-0.55 C
1971
9.5 C
-0.04 C
1972
8.9 C
-0.61 C
1973
10.4 C
+0.89 C
1975
10.0 C
+0.50 C
1976
9.0 C
-0.53 C
1977
9.0 C
-0.47 C
1978
7.3 C
-2.24 C
1979
8.4 C
-1.14 C
1980
9.2 C
-0.25 C
1981
9.1 C
-0.44 C
1982
9.1 C
-0.35 C
1983
10.3 C
+0.78 C
1984
9.8 C
+0.34 C
1985
9.5 C
-0.02 C
1986
9.0 C
-0.51 C
1987
8.9 C
-0.56 C
1988
8.9 C
-0.59 C
1989
8.9 C
-0.59 C
1990
10.2 C
+0.72 C
1991
9.9 C
+0.42 C
1992
8.2 C
-1.32 C
1993
9.6 C
+0.07 C
1994
9.4 C
-0.06 C
1995
9.1 C
-0.42 C
1996
9.6 C
+0.10 C
2000
9.3 C
-0.20 C
2002
9.7 C
+0.22 C
2003
9.0 C
-0.54 C
The annual mean temperature here has fallen by 0.12 C (0.02 to 0.21) per decade over 1933 to 2003. In Fahrenheit: 0.21 F (0.04 to 0.38) per decade. The slope is a straight line fitted to 56 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Long Valley
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.12 C (-0.21 to -0.02) per decade
-0.21 F (-0.38 to -0.04) per decade
1933 to 2003
56
Fall
Mean daily maximum
-0.2 C (-0.3 to -0.1) per decade
-0.4 F (-0.6 to -0.2) per decade
1933 to 2003
56
Fall
Mean daily minimum
-0.01 C (-0.13 to 0.11) per decade
-0.02 F (-0.23 to 0.19) per decade
1933 to 2003
56
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
1929 to 2004
Yearly extremes at Long Valley: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
38.9 C (102.0 F)
1953
34.4 C (93.9 F)
76
Coldest night (TNn)
-31.1 C (-24.0 F)
1943
-20.6 C (-5.1 F)
75
Wettest day (Rx1day)
158.0 mm (6.2 in)
1951
66.3 mm (2.6 in)
76
Wettest five days (Rx5day)
220.1 mm (8.7 in)
1989
106.9 mm (4.2 in)
75
Longest dry spell (CDD)
36 days
1964
16 days
76
Hottest day (TXx)
The hottest day of the year at Long Valley, 1929 to 2004. The record is 38.9 C (102.0 F) in 1953, marked on the chart; the median year is 34.4 C (93.9 F).
Hottest day (TXx) at Long Valley by year
Year
Hottest day (TXx)
1929
22.8 C (73.0 F)
1930
36.7 C (98.1 F)
1931
34.4 C (93.9 F)
1932
35.0 C (95.0 F)
1933
36.7 C (98.1 F)
1934
35.6 C (96.1 F)
1935
33.3 C (91.9 F)
1936
15.6 C (60.1 F)
1937
35.6 C (96.1 F)
1938
33.9 C (93.0 F)
1939
36.1 C (97.0 F)
1940
36.1 C (97.0 F)
1941
35.0 C (95.0 F)
1942
34.4 C (93.9 F)
1943
36.1 C (97.0 F)
1944
37.2 C (99.0 F)
1945
34.4 C (93.9 F)
1946
33.3 C (91.9 F)
1947
34.4 C (93.9 F)
1948
37.8 C (100.0 F)
1949
37.8 C (100.0 F)
1950
33.3 C (91.9 F)
1951
33.3 C (91.9 F)
1952
36.7 C (98.1 F)
1953
38.9 C (102.0 F)
1954
37.8 C (100.0 F)
1955
37.8 C (100.0 F)
1956
35.0 C (95.0 F)
1957
37.2 C (99.0 F)
1958
33.3 C (91.9 F)
1959
35.0 C (95.0 F)
1960
32.2 C (90.0 F)
1961
34.4 C (93.9 F)
1962
35.6 C (96.1 F)
1963
35.0 C (95.0 F)
1964
35.0 C (95.0 F)
1965
32.2 C (90.0 F)
1966
36.7 C (98.1 F)
1967
32.2 C (90.0 F)
1968
34.4 C (93.9 F)
1969
33.9 C (93.0 F)
1970
32.2 C (90.0 F)
1971
32.8 C (91.0 F)
1972
33.3 C (91.9 F)
1973
33.9 C (93.0 F)
1974
33.3 C (91.9 F)
1975
35.0 C (95.0 F)
1976
34.4 C (93.9 F)
1977
33.3 C (91.9 F)
1978
32.2 C (90.0 F)
1979
31.1 C (88.0 F)
1980
35.6 C (96.1 F)
1981
33.3 C (91.9 F)
1982
33.3 C (91.9 F)
1983
35.0 C (95.0 F)
1984
34.4 C (93.9 F)
1985
32.8 C (91.0 F)
1986
33.9 C (93.0 F)
1987
33.3 C (91.9 F)
1988
37.2 C (99.0 F)
1989
32.2 C (90.0 F)
1990
33.9 C (93.0 F)
1991
33.9 C (93.0 F)
1992
32.2 C (90.0 F)
1993
34.4 C (93.9 F)
1994
32.2 C (90.0 F)
1995
35.0 C (95.0 F)
1996
33.9 C (93.0 F)
1997
33.3 C (91.9 F)
1998
31.7 C (89.1 F)
1999
35.6 C (96.1 F)
2000
32.2 C (90.0 F)
2001
33.3 C (91.9 F)
2002
34.4 C (93.9 F)
2003
33.3 C (91.9 F)
2004
31.1 C (88.0 F)
Coldest night (TNn)
The coldest night of the year at Long Valley, 1929 to 2004. The record is -31.1 C (-24.0 F) in 1943, marked on the chart; the median year is -20.6 C (-5.1 F).
Coldest night (TNn) at Long Valley by year
Year
Coldest night (TNn)
1929
n/a
1930
-16.7 C (1.9 F)
1931
-14.4 C (6.1 F)
1932
-20.6 C (-5.1 F)
1933
-24.4 C (-11.9 F)
1934
-27.8 C (-18.0 F)
1935
-25.6 C (-14.1 F)
1936
-15.6 C (3.9 F)
1937
-14.4 C (6.1 F)
1938
-22.2 C (-8.0 F)
1939
-17.8 C (0.0 F)
1940
-18.3 C (-0.9 F)
1941
-15.0 C (5.0 F)
1942
-27.2 C (-17.0 F)
1943
-31.1 C (-24.0 F)
1944
-21.1 C (-6.0 F)
1945
-23.3 C (-9.9 F)
1946
-20.0 C (-4.0 F)
1947
-18.3 C (-0.9 F)
1948
-25.0 C (-13.0 F)
1949
-19.4 C (-2.9 F)
1950
-25.0 C (-13.0 F)
1951
-17.8 C (0.0 F)
1952
-17.2 C (1.0 F)
1953
-14.4 C (6.1 F)
1954
-26.1 C (-15.0 F)
1955
-20.0 C (-4.0 F)
1956
-15.0 C (5.0 F)
1957
-26.1 C (-15.0 F)
1958
-20.6 C (-5.1 F)
1959
-19.4 C (-2.9 F)
1960
-25.0 C (-13.0 F)
1961
-30.6 C (-23.1 F)
1962
-21.1 C (-6.0 F)
1963
-26.7 C (-16.1 F)
1964
-19.4 C (-2.9 F)
1965
-20.6 C (-5.1 F)
1966
-21.7 C (-7.1 F)
1967
-21.7 C (-7.1 F)
1968
-19.4 C (-2.9 F)
1969
-17.2 C (1.0 F)
1970
-22.2 C (-8.0 F)
1971
-21.7 C (-7.1 F)
1972
-18.9 C (-2.0 F)
1973
-17.8 C (0.0 F)
1974
-20.0 C (-4.0 F)
1975
-17.8 C (0.0 F)
1976
-19.4 C (-2.9 F)
1977
-22.2 C (-8.0 F)
1978
-20.6 C (-5.1 F)
1979
-24.4 C (-11.9 F)
1980
-23.9 C (-11.0 F)
1981
-27.2 C (-17.0 F)
1982
-23.3 C (-9.9 F)
1983
-20.6 C (-5.1 F)
1984
-26.1 C (-15.0 F)
1985
-23.3 C (-9.9 F)
1986
-18.9 C (-2.0 F)
1987
-25.0 C (-13.0 F)
1988
-26.7 C (-16.1 F)
1989
-18.9 C (-2.0 F)
1990
-17.2 C (1.0 F)
1991
-17.8 C (0.0 F)
1992
-17.8 C (0.0 F)
1993
-20.6 C (-5.1 F)
1994
-27.8 C (-18.0 F)
1995
-20.6 C (-5.1 F)
1996
-22.8 C (-9.0 F)
1997
-18.9 C (-2.0 F)
1998
-12.2 C (10.0 F)
1999
-15.0 C (5.0 F)
2000
-18.9 C (-2.0 F)
2001
-16.7 C (1.9 F)
2002
-17.8 C (0.0 F)
2003
-18.9 C (-2.0 F)
2004
-20.0 C (-4.0 F)
Wettest day (Rx1day)
The wettest day of the year at Long Valley, 1929 to 2004. The record is 158.0 mm (6.2 in) in 1951, marked on the chart; the median year is 66.3 mm (2.6 in).
Wettest day (Rx1day) at Long Valley by year
Year
Wettest day (Rx1day)
1929
56.9 mm (2.2 in)
1930
63.0 mm (2.5 in)
1931
83.8 mm (3.3 in)
1932
66.5 mm (2.6 in)
1933
60.2 mm (2.4 in)
1934
94.2 mm (3.7 in)
1935
96.0 mm (3.8 in)
1936
63.5 mm (2.5 in)
1937
58.4 mm (2.3 in)
1938
96.5 mm (3.8 in)
1939
44.5 mm (1.8 in)
1940
80.5 mm (3.2 in)
1941
58.4 mm (2.3 in)
1942
59.2 mm (2.3 in)
1943
61.5 mm (2.4 in)
1944
48.3 mm (1.9 in)
1945
90.2 mm (3.6 in)
1946
66.0 mm (2.6 in)
1947
50.3 mm (2.0 in)
1948
64.8 mm (2.6 in)
1949
64.8 mm (2.6 in)
1950
48.3 mm (1.9 in)
1951
158.0 mm (6.2 in)
1952
115.6 mm (4.6 in)
1953
50.8 mm (2.0 in)
1954
49.3 mm (1.9 in)
1955
119.4 mm (4.7 in)
1956
76.2 mm (3.0 in)
1957
59.7 mm (2.4 in)
1958
47.5 mm (1.9 in)
1959
73.7 mm (2.9 in)
1960
91.4 mm (3.6 in)
1961
50.8 mm (2.0 in)
1962
56.1 mm (2.2 in)
1963
54.6 mm (2.1 in)
1964
66.0 mm (2.6 in)
1965
59.7 mm (2.4 in)
1966
48.8 mm (1.9 in)
1967
62.5 mm (2.5 in)
1968
74.7 mm (2.9 in)
1969
61.0 mm (2.4 in)
1970
77.2 mm (3.0 in)
1971
149.9 mm (5.9 in)
1972
125.7 mm (4.9 in)
1973
86.6 mm (3.4 in)
1974
68.3 mm (2.7 in)
1975
86.4 mm (3.4 in)
1976
56.1 mm (2.2 in)
1977
82.8 mm (3.3 in)
1978
46.5 mm (1.8 in)
1979
85.9 mm (3.4 in)
1980
87.1 mm (3.4 in)
1981
77.5 mm (3.1 in)
1982
57.7 mm (2.3 in)
1983
77.5 mm (3.1 in)
1984
85.1 mm (3.4 in)
1985
71.1 mm (2.8 in)
1986
75.4 mm (3.0 in)
1987
71.1 mm (2.8 in)
1988
74.2 mm (2.9 in)
1989
141.5 mm (5.6 in)
1990
63.0 mm (2.5 in)
1991
48.8 mm (1.9 in)
1992
85.9 mm (3.4 in)
1993
81.8 mm (3.2 in)
1994
57.4 mm (2.3 in)
1995
97.5 mm (3.8 in)
1996
156.5 mm (6.2 in)
1997
50.3 mm (2.0 in)
1998
72.9 mm (2.9 in)
1999
104.1 mm (4.1 in)
2000
45.2 mm (1.8 in)
2001
51.3 mm (2.0 in)
2002
44.7 mm (1.8 in)
2003
83.3 mm (3.3 in)
2004
59.7 mm (2.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Long Valley, 1929 to 2004. The record is 220.1 mm (8.7 in) in 1989, marked on the chart; the median year is 106.9 mm (4.2 in).
Wettest five days (Rx5day) at Long Valley by year
Year
Wettest five days (Rx5day)
1929
n/a
1930
104.4 mm (4.1 in)
1931
179.1 mm (7.1 in)
1932
84.4 mm (3.3 in)
1933
150.7 mm (5.9 in)
1934
117.1 mm (4.6 in)
1935
163.3 mm (6.4 in)
1936
63.5 mm (2.5 in)
1937
124.2 mm (4.9 in)
1938
188.8 mm (7.4 in)
1939
63.3 mm (2.5 in)
1940
100.9 mm (4.0 in)
1941
58.4 mm (2.3 in)
1942
142.5 mm (5.6 in)
1943
92.3 mm (3.6 in)
1944
123.2 mm (4.9 in)
1945
191.0 mm (7.5 in)
1946
119.6 mm (4.7 in)
1947
73.7 mm (2.9 in)
1948
124.5 mm (4.9 in)
1949
137.7 mm (5.4 in)
1950
69.9 mm (2.8 in)
1951
164.4 mm (6.5 in)
1952
176.5 mm (6.9 in)
1953
79.0 mm (3.1 in)
1954
81.3 mm (3.2 in)
1955
217.2 mm (8.6 in)
1956
93.5 mm (3.7 in)
1957
87.9 mm (3.5 in)
1958
90.9 mm (3.6 in)
1959
76.8 mm (3.0 in)
1960
123.0 mm (4.8 in)
1961
75.4 mm (3.0 in)
1962
64.3 mm (2.5 in)
1963
94.7 mm (3.7 in)
1964
99.0 mm (3.9 in)
1965
68.1 mm (2.7 in)
1966
80.0 mm (3.1 in)
1967
103.9 mm (4.1 in)
1968
114.8 mm (4.5 in)
1969
76.0 mm (3.0 in)
1970
126.5 mm (5.0 in)
1971
175.8 mm (6.9 in)
1972
161.0 mm (6.3 in)
1973
110.5 mm (4.4 in)
1974
106.9 mm (4.2 in)
1975
152.8 mm (6.0 in)
1976
88.1 mm (3.5 in)
1977
105.4 mm (4.1 in)
1978
96.6 mm (3.8 in)
1979
144.4 mm (5.7 in)
1980
106.4 mm (4.2 in)
1981
128.8 mm (5.1 in)
1982
106.5 mm (4.2 in)
1983
139.2 mm (5.5 in)
1984
151.6 mm (6.0 in)
1985
138.7 mm (5.5 in)
1986
156.0 mm (6.1 in)
1987
122.4 mm (4.8 in)
1988
127.0 mm (5.0 in)
1989
220.1 mm (8.7 in)
1990
87.9 mm (3.5 in)
1991
85.4 mm (3.4 in)
1992
110.0 mm (4.3 in)
1993
112.8 mm (4.4 in)
1994
96.0 mm (3.8 in)
1995
100.0 mm (3.9 in)
1996
185.6 mm (7.3 in)
1997
89.2 mm (3.5 in)
1998
125.8 mm (5.0 in)
1999
129.5 mm (5.1 in)
2000
92.5 mm (3.6 in)
2001
79.3 mm (3.1 in)
2002
80.3 mm (3.2 in)
2003
132.9 mm (5.2 in)
2004
80.0 mm (3.1 in)
Longest dry spell (CDD)
The longest dry spell of the year at Long Valley, 1929 to 2004. The record is 36 days in 1964, marked on the chart; the median year is 16 days.
Longest dry spell (CDD) at Long Valley by year
Year
Longest dry spell (CDD)
1929
1 day
1930
19 days
1931
19 days
1932
16 days
1933
17 days
1934
16 days
1935
15 days
1936
14 days
1937
11 days
1938
13 days
1939
24 days
1940
16 days
1941
22 days
1942
24 days
1943
19 days
1944
20 days
1945
13 days
1946
22 days
1947
25 days
1948
16 days
1949
18 days
1950
15 days
1951
12 days
1952
14 days
1953
16 days
1954
13 days
1955
15 days
1956
14 days
1957
12 days
1958
14 days
1959
17 days
1960
13 days
1961
16 days
1962
19 days
1963
23 days
1964
36 days
1965
14 days
1966
15 days
1967
16 days
1968
26 days
1969
13 days
1970
17 days
1971
21 days
1972
18 days
1973
15 days
1974
15 days
1975
14 days
1976
22 days
1977
21 days
1978
19 days
1979
14 days
1980
23 days
1981
15 days
1982
12 days
1983
16 days
1984
11 days
1985
13 days
1986
15 days
1987
26 days
1988
18 days
1989
15 days
1990
15 days
1991
23 days
1992
13 days
1993
11 days
1994
18 days
1995
34 days
1996
13 days
1997
16 days
1998
13 days
1999
17 days
2000
21 days
2001
29 days
2002
12 days
2003
15 days
2004
17 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
56 years with a frost
Across 56 years with a frost, the median last spring frost at Long Valley falls on 9 May and the median first autumn frost on 4 October, which leaves a median of 151 days between them.
Fitted over all years, the growing season changes by +1.3 days per decade at this station.
Frost dates and growing season at Long Valley
Measure
Median, all years
Earliest period
Recent period (1968 to 2003)
Recent against earliest
Fitted trend
Last spring frost
9 May
n/a
9 May
n/a
-0.4 days per decade
First autumn frost
4 October
n/a
7 October
n/a
+0.9 days per decade
Growing days
151 days
n/a
153 days
n/a
+1.3 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
67 years, 1933 to 2003
A day with at least 68.6 mm (2.7 in) of rain is expected about once in 2 years. A day with at least 179.1 mm (7.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Long 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
68.6 mm (2.7 in)
5 years
91.0 mm (3.6 in)
10 years
108.4 mm (4.3 in)
25 years
133.6 mm (5.3 in)
50 years
155.1 mm (6.1 in)
100 years
179.1 mm (7.1 in)
Longer than the 67 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, 67 years of values from 1933 to 2003.
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: 158.0 mm (6.2 in) in 1951; 156.5 mm (6.2 in) in 1996; 149.9 mm (5.9 in) in 1971.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Long Valley standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Long 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.