Record envelope, standing records and threshold days for Longvalley (USC00394983), South Dakota, United States, with 86 years of record.
Key Facts for Longvalley
Longvalley (USC00394983) is a weather station in South Dakota, United States at 43.46 latitude and -101.50 longitude, 753 m (2,470 ft) above sea level.
The station reports from 1927 to 2012, 86 years of record.
1,464 records set at Longvalley still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Longvalley set a daily record high maximum temperature of 42.8 C (109.0 F) on 29 August 2012.
About the Station
Location: South Dakota, United States, 43.46 latitude, -101.50 longitude.
Elevation: 753 m (2,470 ft).
Period of record: 1927 to 2012, 86 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 Longvalley. 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 Longvalley, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
22.8 C (73.0 F)
-36.1 C (-33.0 F)
n/a
n/a
Feb
23.9 C (75.0 F)
-34.4 C (-29.9 F)
n/a
n/a
Mar
31.1 C (88.0 F)
-32.2 C (-26.0 F)
n/a
n/a
Apr
35.0 C (95.0 F)
-20.6 C (-5.1 F)
n/a
n/a
May
38.9 C (102.0 F)
-10.0 C (14.0 F)
n/a
n/a
Jun
42.2 C (108.0 F)
-0.6 C (30.9 F)
n/a
n/a
Jul
46.1 C (115.0 F)
2.8 C (37.0 F)
n/a
n/a
Aug
45.0 C (113.0 F)
-0.6 C (30.9 F)
n/a
n/a
Sep
41.1 C (106.0 F)
-8.3 C (17.1 F)
n/a
n/a
Oct
36.1 C (97.0 F)
-17.8 C (0.0 F)
n/a
n/a
Nov
29.4 C (84.9 F)
-28.3 C (-18.9 F)
n/a
n/a
Dec
23.9 C (75.0 F)
-37.2 C (-35.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Longvalley still stand. 1985 holds the most, with 40.
Standing records at Longvalley by the year they were set
Year set
Standing records
1927
8
1928
11
1929
17
1930
21
1931
28
1932
24
1933
32
1934
34
1935
14
1936
36
1937
23
1938
16
1939
33
1940
15
1941
15
1942
17
1943
19
1944
11
1945
15
1946
21
1947
19
1948
24
1949
18
1950
18
1951
17
1952
17
1953
14
1954
22
1955
13
1956
12
1957
11
1958
11
1959
22
1960
13
1961
7
1962
23
1963
22
1964
16
1965
23
1966
8
1967
17
1968
15
1969
17
1970
11
1971
9
1972
18
1973
13
1974
24
1975
11
1976
20
1977
11
1978
6
1979
19
1980
13
1981
15
1982
10
1983
19
1984
10
1985
40
1986
19
1987
11
1988
17
1989
30
1990
18
1991
28
1992
22
1993
10
1994
16
1995
21
1996
17
1997
25
1998
18
1999
12
2000
15
2001
9
2002
9
2003
16
2004
10
2005
20
2006
19
2007
14
2008
6
2009
23
2010
5
2011
11
2012
5
All-Time Record Progression
4 new records
4 all-time records were set at Longvalley between 6 August 1960 and 22 December 1989. Each dot is a new record.
When Longvalley set new all-time records
Date
Kind
Detail
1960-08-06
Record daily precipitation
Record daily precipitation 78.7 mm (3.1 in)
1961-07-27
Record daily precipitation
Record daily precipitation 101.6 mm (4.0 in)
1989-02-03
Record low maximum temperature
Record low maximum temperature -27.2 C (-17.0 F)
1989-12-22
Record low minimum temperature
Record low minimum temperature -37.2 C (-35.0 F)
Wettest Day of Each Month
Jun: 101.6 mm (4.0 in)
The wettest day on record for each calendar month at Longvalley. The most was 101.6 mm (4.0 in) on 30 June 1988.
Record daily precipitation for each month at Longvalley
Month
Record daily precipitation (mm)
Date
Jan
23.1 mm (0.9 in)
8 January 1939
Feb
33.5 mm (1.3 in)
9 February 2009
Mar
53.3 mm (2.1 in)
27 March 1928
Apr
69.9 mm (2.8 in)
21 April 2005
May
61.7 mm (2.4 in)
27 May 1973
Jun
101.6 mm (4.0 in)
30 June 1988
Jul
101.6 mm (4.0 in)
27 July 1961
Aug
78.7 mm (3.1 in)
6 August 1960
Sep
58.4 mm (2.3 in)
18 September 1946
Oct
58.7 mm (2.3 in)
10 October 1949
Nov
27.9 mm (1.1 in)
19 November 1930
Dec
19.3 mm (0.8 in)
6 December 1951
Period of Record Coverage
1927 to 2012
Complete yearUnder 90 percent of days
86 years of record at Longvalley, 1927 to 2012. 12 years have data for under 90 percent of days and are left out of rankings: 1927, 1929, 1931, 1933, 1934, 1935, 1936, 1937 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 66 complete years at Longvalley, 1928 to 2010. Blue stripes are years cooler than the station's own mean of 9.3 C (48.7 F); red stripes are warmer. The coolest year was 1951, at 7.0 C (44.7 F), and the warmest was 1939, at 11.0 C (51.8 F). The strongest colour marks a difference of 2.3 C (4.1 F).
Annual mean temperature at Longvalley as warming stripes, 1928 to 2010
Year
Annual mean temperature
Difference from the station mean
1928
9.1 C
-0.23 C
1930
8.8 C
-0.44 C
1932
8.6 C
-0.69 C
1939
11.0 C
+1.70 C
1940
9.5 C
+0.21 C
1941
10.2 C
+0.90 C
1942
9.2 C
-0.06 C
1943
9.7 C
+0.38 C
1944
8.6 C
-0.68 C
1945
8.8 C
-0.52 C
1946
10.7 C
+1.39 C
1947
9.4 C
+0.16 C
1948
9.3 C
0.00 C
1951
7.0 C
-2.25 C
1952
9.2 C
-0.06 C
1953
10.2 C
+0.92 C
1954
10.5 C
+1.22 C
1955
8.9 C
-0.38 C
1956
9.1 C
-0.15 C
1957
8.8 C
-0.48 C
1958
9.1 C
-0.14 C
1959
9.2 C
-0.11 C
1960
8.9 C
-0.42 C
1962
9.2 C
-0.05 C
1963
10.5 C
+1.22 C
1964
9.4 C
+0.11 C
1965
8.9 C
-0.38 C
1966
8.6 C
-0.64 C
1967
8.8 C
-0.47 C
1968
8.3 C
-0.96 C
1969
9.2 C
-0.12 C
1970
8.7 C
-0.54 C
1971
8.7 C
-0.62 C
1972
8.3 C
-1.02 C
1973
9.6 C
+0.33 C
1974
10.2 C
+0.87 C
1975
8.7 C
-0.55 C
1976
10.2 C
+0.91 C
1977
9.7 C
+0.42 C
1980
10.0 C
+0.67 C
1981
10.2 C
+0.90 C
1982
7.7 C
-1.59 C
1984
8.3 C
-1.01 C
1985
7.6 C
-1.67 C
1986
8.7 C
-0.62 C
1987
10.0 C
+0.67 C
1988
9.6 C
+0.29 C
1989
8.8 C
-0.48 C
1990
9.9 C
+0.64 C
1991
9.8 C
+0.54 C
1992
9.6 C
+0.33 C
1993
7.7 C
-1.62 C
1994
9.6 C
+0.33 C
1995
9.3 C
+0.01 C
1996
7.8 C
-1.52 C
1997
9.1 C
-0.22 C
1998
9.7 C
+0.37 C
1999
10.8 C
+1.51 C
2000
9.7 C
+0.40 C
2001
10.1 C
+0.77 C
2004
10.0 C
+0.74 C
2005
10.2 C
+0.89 C
2006
10.5 C
+1.24 C
2007
10.4 C
+1.08 C
2009
8.4 C
-0.88 C
2010
9.0 C
-0.29 C
The fitted trend in annual mean temperature here over 1928 to 2010 is 0.03 C (-0.07 to 0.12) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.05 F (-0.12 to 0.22) per decade. The slope is a straight line fitted to 66 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Longvalley
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.03 C (-0.07 to 0.12) per decade
0.05 F (-0.12 to 0.22) per decade
1928 to 2010
66
Not clearly different from zero
Mean daily maximum
-0.03 C (-0.14 to 0.08) per decade
-0.1 F (-0.3 to 0.1) per decade
1928 to 2010
66
Not clearly different from zero
Mean daily minimum
0.09 C (-0.02 to 0.19) per decade
0.16 F (-0.03 to 0.34) per decade
1928 to 2010
66
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
1927 to 2012
Yearly extremes at Longvalley: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
46.1 C (115.0 F)
1933
40.9 C (105.5 F)
86
Coldest night (TNn)
-37.2 C (-35.0 F)
1989
-29.4 C (-20.9 F)
86
Wettest day (Rx1day)
101.6 mm (4.0 in)
1961
43.5 mm (1.7 in)
86
Wettest five days (Rx5day)
126.7 mm (5.0 in)
1942
65.7 mm (2.6 in)
86
Longest dry spell (CDD)
89 days
1945
34 days
86
Hottest day (TXx)
The hottest day of the year at Longvalley, 1927 to 2012. The record is 46.1 C (115.0 F) in 1933, marked on the chart; the median year is 40.9 C (105.5 F).
Hottest day (TXx) at Longvalley by year
Year
Hottest day (TXx)
1927
36.1 C (97.0 F)
1928
38.9 C (102.0 F)
1929
37.2 C (99.0 F)
1930
42.2 C (108.0 F)
1931
42.8 C (109.0 F)
1932
39.4 C (102.9 F)
1933
46.1 C (115.0 F)
1934
41.1 C (106.0 F)
1935
43.3 C (109.9 F)
1936
44.4 C (111.9 F)
1937
45.0 C (113.0 F)
1938
43.9 C (111.0 F)
1939
45.0 C (113.0 F)
1940
46.1 C (115.0 F)
1941
41.1 C (106.0 F)
1942
38.3 C (100.9 F)
1943
42.2 C (108.0 F)
1944
39.4 C (102.9 F)
1945
41.7 C (107.1 F)
1946
42.2 C (108.0 F)
1947
43.9 C (111.0 F)
1948
41.1 C (106.0 F)
1949
41.7 C (107.1 F)
1950
37.2 C (99.0 F)
1951
40.0 C (104.0 F)
1952
44.4 C (111.9 F)
1953
40.0 C (104.0 F)
1954
42.2 C (108.0 F)
1955
41.1 C (106.0 F)
1956
39.4 C (102.9 F)
1957
37.8 C (100.0 F)
1958
38.3 C (100.9 F)
1959
42.8 C (109.0 F)
1960
41.1 C (106.0 F)
1961
41.7 C (107.1 F)
1962
40.6 C (105.1 F)
1963
41.7 C (107.1 F)
1964
43.9 C (111.0 F)
1965
40.6 C (105.1 F)
1966
41.7 C (107.1 F)
1967
39.4 C (102.9 F)
1968
39.4 C (102.9 F)
1969
41.7 C (107.1 F)
1970
42.2 C (108.0 F)
1971
40.6 C (105.1 F)
1972
38.9 C (102.0 F)
1973
42.2 C (108.0 F)
1974
41.7 C (107.1 F)
1975
39.4 C (102.9 F)
1976
40.0 C (104.0 F)
1977
42.2 C (108.0 F)
1978
38.9 C (102.0 F)
1979
41.7 C (107.1 F)
1980
43.3 C (109.9 F)
1981
40.6 C (105.1 F)
1982
40.0 C (104.0 F)
1983
40.6 C (105.1 F)
1984
39.4 C (102.9 F)
1985
43.3 C (109.9 F)
1986
38.9 C (102.0 F)
1987
40.0 C (104.0 F)
1988
41.7 C (107.1 F)
1989
42.8 C (109.0 F)
1990
41.7 C (107.1 F)
1991
41.1 C (106.0 F)
1992
37.8 C (100.0 F)
1993
36.7 C (98.1 F)
1994
38.9 C (102.0 F)
1995
40.0 C (104.0 F)
1996
37.8 C (100.0 F)
1997
37.2 C (99.0 F)
1998
41.1 C (106.0 F)
1999
39.4 C (102.9 F)
2000
40.0 C (104.0 F)
2001
39.4 C (102.9 F)
2002
40.6 C (105.1 F)
2003
41.7 C (107.1 F)
2004
39.4 C (102.9 F)
2005
38.9 C (102.0 F)
2006
45.0 C (113.0 F)
2007
41.7 C (107.1 F)
2008
36.7 C (98.1 F)
2009
36.1 C (97.0 F)
2010
40.0 C (104.0 F)
2011
38.3 C (100.9 F)
2012
42.8 C (109.0 F)
Coldest night (TNn)
The coldest night of the year at Longvalley, 1927 to 2012. The record is -37.2 C (-35.0 F) in 1989, marked on the chart; the median year is -29.4 C (-20.9 F).
Coldest night (TNn) at Longvalley by year
Year
Coldest night (TNn)
1927
-30.0 C (-22.0 F)
1928
-30.6 C (-23.1 F)
1929
-31.7 C (-25.1 F)
1930
-34.4 C (-29.9 F)
1931
-20.6 C (-5.1 F)
1932
-30.6 C (-23.1 F)
1933
-25.6 C (-14.1 F)
1934
-27.8 C (-18.0 F)
1935
-30.6 C (-23.1 F)
1936
-26.1 C (-15.0 F)
1937
-29.4 C (-20.9 F)
1938
-27.2 C (-17.0 F)
1939
-30.6 C (-23.1 F)
1940
-29.4 C (-20.9 F)
1941
-25.6 C (-14.1 F)
1942
-28.9 C (-20.0 F)
1943
-33.3 C (-27.9 F)
1944
-32.2 C (-26.0 F)
1945
-27.8 C (-18.0 F)
1946
-29.4 C (-20.9 F)
1947
-29.4 C (-20.9 F)
1948
-27.2 C (-17.0 F)
1949
-36.1 C (-33.0 F)
1950
-35.0 C (-31.0 F)
1951
-31.7 C (-25.1 F)
1952
-27.2 C (-17.0 F)
1953
-26.7 C (-16.1 F)
1954
-31.1 C (-24.0 F)
1955
-27.2 C (-17.0 F)
1956
-25.6 C (-14.1 F)
1957
-35.0 C (-31.0 F)
1958
-25.6 C (-14.1 F)
1959
-30.0 C (-22.0 F)
1960
-30.0 C (-22.0 F)
1961
-25.6 C (-14.1 F)
1962
-30.6 C (-23.1 F)
1963
-32.2 C (-26.0 F)
1964
-30.0 C (-22.0 F)
1965
-25.0 C (-13.0 F)
1966
-28.9 C (-20.0 F)
1967
-31.7 C (-25.1 F)
1968
-32.2 C (-26.0 F)
1969
-28.3 C (-18.9 F)
1970
-28.3 C (-18.9 F)
1971
-28.9 C (-20.0 F)
1972
-30.0 C (-22.0 F)
1973
-27.8 C (-18.0 F)
1974
-30.0 C (-22.0 F)
1975
-27.8 C (-18.0 F)
1976
-28.9 C (-20.0 F)
1977
-29.4 C (-20.9 F)
1978
-29.4 C (-20.9 F)
1979
-31.1 C (-24.0 F)
1980
-28.3 C (-18.9 F)
1981
-27.2 C (-17.0 F)
1982
-32.8 C (-27.0 F)
1983
-36.1 C (-33.0 F)
1984
-31.7 C (-25.1 F)
1985
-31.7 C (-25.1 F)
1986
-27.2 C (-17.0 F)
1987
-22.8 C (-9.0 F)
1988
-30.6 C (-23.1 F)
1989
-37.2 C (-35.0 F)
1990
-33.9 C (-29.0 F)
1991
-25.0 C (-13.0 F)
1992
-24.4 C (-11.9 F)
1993
-28.9 C (-20.0 F)
1994
-33.3 C (-27.9 F)
1995
-24.4 C (-11.9 F)
1996
-34.4 C (-29.9 F)
1997
-26.7 C (-16.1 F)
1998
-32.2 C (-26.0 F)
1999
-27.2 C (-17.0 F)
2000
-30.0 C (-22.0 F)
2001
-22.2 C (-8.0 F)
2002
-21.7 C (-7.1 F)
2003
-29.4 C (-20.9 F)
2004
-26.1 C (-15.0 F)
2005
-27.2 C (-17.0 F)
2006
-31.1 C (-24.0 F)
2007
-30.0 C (-22.0 F)
2008
-26.7 C (-16.1 F)
2009
-23.9 C (-11.0 F)
2010
-30.0 C (-22.0 F)
2011
-27.8 C (-18.0 F)
2012
-24.4 C (-11.9 F)
Wettest day (Rx1day)
The wettest day of the year at Longvalley, 1927 to 2012. The record is 101.6 mm (4.0 in) in 1961, marked on the chart; the median year is 43.5 mm (1.7 in).
Wettest day (Rx1day) at Longvalley by year
Year
Wettest day (Rx1day)
1927
48.0 mm (1.9 in)
1928
53.3 mm (2.1 in)
1929
47.8 mm (1.9 in)
1930
67.8 mm (2.7 in)
1931
47.0 mm (1.9 in)
1932
51.8 mm (2.0 in)
1933
19.8 mm (0.8 in)
1934
27.4 mm (1.1 in)
1935
43.7 mm (1.7 in)
1936
18.0 mm (0.7 in)
1937
23.4 mm (0.9 in)
1938
33.8 mm (1.3 in)
1939
29.0 mm (1.1 in)
1940
40.6 mm (1.6 in)
1941
59.7 mm (2.4 in)
1942
63.8 mm (2.5 in)
1943
26.7 mm (1.1 in)
1944
49.3 mm (1.9 in)
1945
41.4 mm (1.6 in)
1946
61.7 mm (2.4 in)
1947
38.1 mm (1.5 in)
1948
40.6 mm (1.6 in)
1949
58.7 mm (2.3 in)
1950
22.6 mm (0.9 in)
1951
26.2 mm (1.0 in)
1952
34.8 mm (1.4 in)
1953
42.9 mm (1.7 in)
1954
37.3 mm (1.5 in)
1955
54.4 mm (2.1 in)
1956
68.6 mm (2.7 in)
1957
73.7 mm (2.9 in)
1958
31.8 mm (1.3 in)
1959
23.6 mm (0.9 in)
1960
78.7 mm (3.1 in)
1961
101.6 mm (4.0 in)
1962
63.5 mm (2.5 in)
1963
48.8 mm (1.9 in)
1964
44.5 mm (1.8 in)
1965
56.1 mm (2.2 in)
1966
32.8 mm (1.3 in)
1967
37.6 mm (1.5 in)
1968
57.2 mm (2.3 in)
1969
46.7 mm (1.8 in)
1970
59.7 mm (2.4 in)
1971
48.5 mm (1.9 in)
1972
26.9 mm (1.1 in)
1973
61.7 mm (2.4 in)
1974
23.4 mm (0.9 in)
1975
59.7 mm (2.4 in)
1976
73.9 mm (2.9 in)
1977
39.9 mm (1.6 in)
1978
49.8 mm (2.0 in)
1979
39.6 mm (1.6 in)
1980
33.8 mm (1.3 in)
1981
33.8 mm (1.3 in)
1982
77.2 mm (3.0 in)
1983
55.1 mm (2.2 in)
1984
34.8 mm (1.4 in)
1985
23.6 mm (0.9 in)
1986
61.0 mm (2.4 in)
1987
45.2 mm (1.8 in)
1988
101.6 mm (4.0 in)
1989
27.7 mm (1.1 in)
1990
57.2 mm (2.3 in)
1991
36.3 mm (1.4 in)
1992
20.3 mm (0.8 in)
1993
46.5 mm (1.8 in)
1994
41.7 mm (1.6 in)
1995
50.8 mm (2.0 in)
1996
44.5 mm (1.8 in)
1997
57.4 mm (2.3 in)
1998
47.0 mm (1.9 in)
1999
33.5 mm (1.3 in)
2000
49.5 mm (1.9 in)
2001
38.1 mm (1.5 in)
2002
30.5 mm (1.2 in)
2003
27.4 mm (1.1 in)
2004
34.3 mm (1.4 in)
2005
69.9 mm (2.8 in)
2006
32.5 mm (1.3 in)
2007
43.2 mm (1.7 in)
2008
54.6 mm (2.1 in)
2009
38.1 mm (1.5 in)
2010
43.2 mm (1.7 in)
2011
36.3 mm (1.4 in)
2012
19.1 mm (0.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Longvalley, 1927 to 2012. The record is 126.7 mm (5.0 in) in 1942, marked on the chart; the median year is 65.7 mm (2.6 in).
Wettest five days (Rx5day) at Longvalley by year
Year
Wettest five days (Rx5day)
1927
52.1 mm (2.1 in)
1928
66.3 mm (2.6 in)
1929
48.6 mm (1.9 in)
1930
72.1 mm (2.8 in)
1931
51.6 mm (2.0 in)
1932
62.0 mm (2.4 in)
1933
49.5 mm (1.9 in)
1934
35.3 mm (1.4 in)
1935
73.1 mm (2.9 in)
1936
18.0 mm (0.7 in)
1937
38.4 mm (1.5 in)
1938
55.4 mm (2.2 in)
1939
29.0 mm (1.1 in)
1940
42.1 mm (1.7 in)
1941
104.6 mm (4.1 in)
1942
126.7 mm (5.0 in)
1943
49.1 mm (1.9 in)
1944
73.1 mm (2.9 in)
1945
41.4 mm (1.6 in)
1946
79.5 mm (3.1 in)
1947
63.8 mm (2.5 in)
1948
74.9 mm (2.9 in)
1949
74.2 mm (2.9 in)
1950
45.4 mm (1.8 in)
1951
66.7 mm (2.6 in)
1952
53.6 mm (2.1 in)
1953
82.6 mm (3.3 in)
1954
49.5 mm (1.9 in)
1955
65.1 mm (2.6 in)
1956
102.6 mm (4.0 in)
1957
96.5 mm (3.8 in)
1958
36.1 mm (1.4 in)
1959
50.5 mm (2.0 in)
1960
86.6 mm (3.4 in)
1961
104.6 mm (4.1 in)
1962
98.5 mm (3.9 in)
1963
66.5 mm (2.6 in)
1964
93.0 mm (3.7 in)
1965
71.3 mm (2.8 in)
1966
58.4 mm (2.3 in)
1967
84.8 mm (3.3 in)
1968
100.9 mm (4.0 in)
1969
66.5 mm (2.6 in)
1970
82.9 mm (3.3 in)
1971
78.2 mm (3.1 in)
1972
54.1 mm (2.1 in)
1973
82.5 mm (3.2 in)
1974
32.5 mm (1.3 in)
1975
78.3 mm (3.1 in)
1976
114.0 mm (4.5 in)
1977
50.8 mm (2.0 in)
1978
65.0 mm (2.6 in)
1979
71.6 mm (2.8 in)
1980
54.7 mm (2.2 in)
1981
59.9 mm (2.4 in)
1982
102.9 mm (4.1 in)
1983
84.4 mm (3.3 in)
1984
59.4 mm (2.3 in)
1985
35.8 mm (1.4 in)
1986
98.4 mm (3.9 in)
1987
60.4 mm (2.4 in)
1988
124.4 mm (4.9 in)
1989
39.8 mm (1.6 in)
1990
60.2 mm (2.4 in)
1991
85.9 mm (3.4 in)
1992
46.3 mm (1.8 in)
1993
64.8 mm (2.6 in)
1994
41.7 mm (1.6 in)
1995
74.9 mm (2.9 in)
1996
111.8 mm (4.4 in)
1997
100.8 mm (4.0 in)
1998
77.7 mm (3.1 in)
1999
71.6 mm (2.8 in)
2000
73.1 mm (2.9 in)
2001
44.8 mm (1.8 in)
2002
47.2 mm (1.9 in)
2003
53.3 mm (2.1 in)
2004
55.7 mm (2.2 in)
2005
93.6 mm (3.7 in)
2006
61.4 mm (2.4 in)
2007
61.9 mm (2.4 in)
2008
97.3 mm (3.8 in)
2009
62.8 mm (2.5 in)
2010
73.2 mm (2.9 in)
2011
68.0 mm (2.7 in)
2012
33.3 mm (1.3 in)
Longest dry spell (CDD)
The longest dry spell of the year at Longvalley, 1927 to 2012. The record is 89 days in 1945, marked on the chart; the median year is 34 days.
Longest dry spell (CDD) at Longvalley by year
Year
Longest dry spell (CDD)
1927
21 days
1928
52 days
1929
23 days
1930
32 days
1931
34 days
1932
62 days
1933
42 days
1934
37 days
1935
39 days
1936
37 days
1937
38 days
1938
58 days
1939
59 days
1940
35 days
1941
27 days
1942
35 days
1943
54 days
1944
37 days
1945
89 days
1946
47 days
1947
33 days
1948
53 days
1949
52 days
1950
50 days
1951
35 days
1952
64 days
1953
30 days
1954
35 days
1955
28 days
1956
46 days
1957
27 days
1958
26 days
1959
34 days
1960
22 days
1961
32 days
1962
73 days
1963
49 days
1964
84 days
1965
52 days
1966
21 days
1967
44 days
1968
44 days
1969
37 days
1970
21 days
1971
34 days
1972
40 days
1973
43 days
1974
33 days
1975
31 days
1976
59 days
1977
17 days
1978
29 days
1979
62 days
1980
29 days
1981
46 days
1982
26 days
1983
23 days
1984
32 days
1985
45 days
1986
31 days
1987
45 days
1988
41 days
1989
33 days
1990
37 days
1991
33 days
1992
27 days
1993
26 days
1994
30 days
1995
24 days
1996
25 days
1997
26 days
1998
51 days
1999
29 days
2000
17 days
2001
34 days
2002
28 days
2003
22 days
2004
48 days
2005
37 days
2006
23 days
2007
41 days
2008
23 days
2009
22 days
2010
25 days
2011
18 days
2012
28 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
66 years with a frost
Across 66 years with a frost, the median last spring frost at Longvalley falls on 11 May and the median first autumn frost on 26 September, which leaves a median of 136 days between them.
In 1975 to 2010 the median growing season was 141 days. That is 7 days more than in 1928 to 1968.
Fitted over all years, the growing season changes by +0.7 days per decade at this station.
Frost dates and growing season at Longvalley
Measure
Median, all years
Earliest period (1928 to 1968)
Recent period (1975 to 2010)
Recent against earliest
Fitted trend
Last spring frost
11 May
13 May
10 May
3 days earlier
-0.9 days per decade
First autumn frost
26 September
27 September
26 September
1 day earlier
-0.2 days per decade
Growing days
136 days
134 days
141 days
7 days more
+0.7 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
80 years, 1928 to 2011
A day with at least 43.8 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 98.3 mm (3.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Longvalley: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
43.8 mm (1.7 in)
5 years
59.0 mm (2.3 in)
10 years
68.8 mm (2.7 in)
25 years
80.9 mm (3.2 in)
50 years
89.7 mm (3.5 in)
100 years
98.3 mm (3.9 in)
Longer than the 80 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, 80 years of values from 1928 to 2011.
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: 101.6 mm (4.0 in) in 1961; 101.6 mm (4.0 in) in 1988; 78.7 mm (3.1 in) in 1960.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Longvalley standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Longvalley 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.