Record envelope, standing records and threshold days for Clear Lake (USC00391777), South Dakota, United States, with 124 years of record.
Key Facts for Clear Lake
Clear Lake (USC00391777) is a weather station in South Dakota, United States at 44.76 latitude and -96.68 longitude, 552 m (1,812 ft) above sea level.
The station reports from 1903 to 2026, 124 years of record.
1,464 records set at Clear Lake still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Clear Lake set a daily record precipitation of 62.0 mm (2.4 in) on 8 July 2026.
About the Station
Location: South Dakota, United States, 44.76 latitude, -96.68 longitude.
Elevation: 552 m (1,812 ft).
Period of record: 1903 to 2026, 124 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 Clear Lake. 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 Clear Lake, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
18.9 C (66.0 F)
-38.3 C (-36.9 F)
n/a
n/a
Feb
16.7 C (62.1 F)
-36.1 C (-33.0 F)
n/a
n/a
Mar
27.2 C (81.0 F)
-30.0 C (-22.0 F)
n/a
n/a
Apr
34.4 C (93.9 F)
-17.8 C (0.0 F)
n/a
n/a
May
36.7 C (98.1 F)
-8.3 C (17.1 F)
n/a
n/a
Jun
38.9 C (102.0 F)
1.1 C (34.0 F)
n/a
n/a
Jul
41.7 C (107.1 F)
3.9 C (39.0 F)
n/a
n/a
Aug
38.9 C (102.0 F)
2.8 C (37.0 F)
n/a
n/a
Sep
36.1 C (97.0 F)
-7.2 C (19.0 F)
n/a
n/a
Oct
31.7 C (89.1 F)
-12.8 C (9.0 F)
n/a
n/a
Nov
25.6 C (78.1 F)
-27.8 C (-18.0 F)
n/a
n/a
Dec
15.6 C (60.1 F)
-34.4 C (-29.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Clear Lake still stand. 1907 holds the most, with 36.
Standing records at Clear Lake by the year they were set
Year set
Standing records
1903
17
1904
20
1905
20
1906
10
1907
36
1908
20
1909
16
1955
29
1956
19
1957
16
1958
29
1959
33
1960
16
1961
15
1962
22
1963
23
1964
28
1965
28
1966
26
1967
22
1968
16
1969
21
1970
22
1971
13
1972
24
1973
22
1974
25
1975
14
1976
33
1977
19
1978
8
1979
19
1980
14
1981
28
1982
9
1983
23
1984
14
1985
18
1986
11
1987
32
1988
34
1989
23
1990
33
1991
30
1992
27
1993
13
1994
21
1995
17
1996
21
1997
10
1998
16
1999
19
2000
28
2001
21
2002
23
2003
13
2004
16
2005
14
2006
16
2007
14
2008
12
2009
17
2010
10
2011
17
2012
26
2013
29
2014
17
2015
24
2016
13
2017
15
2018
23
2019
22
All-Time Record Progression
8 new records
8 all-time records were set at Clear Lake between 22 December 1968 and 30 January 2019. Each dot is a new record.
When Clear Lake set new all-time records
Date
Kind
Detail
1968-12-22
Record daily snowfall
Record daily snowfall 45.7 cm (18.0 in)
1979-01-26
Record snow depth
Record snow depth 83.8 cm (33.0 in)
1992-06-16
Record daily precipitation
Record daily precipitation 115.6 mm (4.6 in)
2001-02-08
Record snow depth
Record snow depth 101.6 cm (40.0 in)
2001-02-09
Record snow depth
Record snow depth 106.7 cm (42.0 in)
2001-02-12
Record snow depth
Record snow depth 109.2 cm (43.0 in)
2011-07-19
Record high minimum temperature
Record high minimum temperature 25.6 C (78.1 F)
2019-01-30
Record low minimum temperature
Record low minimum temperature -38.3 C (-36.9 F)
Wettest Day of Each Month
Jun: 115.6 mm (4.6 in)
The wettest day on record for each calendar month at Clear Lake. The most was 115.6 mm (4.6 in) on 16 June 1992.
Record daily precipitation for each month at Clear Lake
Month
Record daily precipitation (mm)
Date
Jan
41.7 mm (1.6 in)
4 January 1997
Feb
31.8 mm (1.3 in)
27 February 1948
Mar
78.7 mm (3.1 in)
23 March 2009
Apr
54.1 mm (2.1 in)
23 April 2001
May
56.4 mm (2.2 in)
30 May 2004
Jun
115.6 mm (4.6 in)
16 June 1992
Jul
88.1 mm (3.5 in)
21 July 1948
Aug
114.8 mm (4.5 in)
7 August 2015
Sep
111.8 mm (4.4 in)
2 September 2006
Oct
65.5 mm (2.6 in)
17 October 1996
Nov
47.5 mm (1.9 in)
19 November 1983
Dec
32.0 mm (1.3 in)
3 December 1953
Period of Record Coverage
1903 to 2020
Complete yearUnder 90 percent of days
73 years of record at Clear Lake, 1903 to 2020. 11 years have data for under 90 percent of days and are left out of rankings: 1903, 1905, 1907, 1908, 1909, 1955, 1962, 1976 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 58 complete years at Clear Lake, 1904 to 2019. Blue stripes are years cooler than the station's own mean of 6.3 C (43.4 F); red stripes are warmer. The coolest year was 2019, at 4.1 C (39.4 F), and the warmest was 1987, at 9.2 C (48.5 F). The strongest colour marks a difference of 2.9 C (5.2 F).
Annual mean temperature at Clear Lake as warming stripes, 1904 to 2019
Year
Annual mean temperature
Difference from the station mean
1904
5.0 C
-1.38 C
1956
6.2 C
-0.09 C
1957
6.6 C
+0.25 C
1958
7.0 C
+0.67 C
1959
6.6 C
+0.30 C
1960
5.8 C
-0.50 C
1961
6.5 C
+0.16 C
1963
7.1 C
+0.80 C
1964
6.6 C
+0.28 C
1965
5.4 C
-0.94 C
1967
6.2 C
-0.11 C
1968
6.7 C
+0.33 C
1969
5.5 C
-0.83 C
1970
6.1 C
-0.25 C
1971
6.3 C
-0.03 C
1972
5.2 C
-1.16 C
1973
7.5 C
+1.21 C
1974
7.0 C
+0.62 C
1975
6.3 C
-0.07 C
1977
6.8 C
+0.49 C
1978
5.4 C
-0.89 C
1979
5.1 C
-1.23 C
1980
7.1 C
+0.76 C
1981
8.0 C
+1.63 C
1982
5.8 C
-0.55 C
1983
6.6 C
+0.25 C
1984
6.7 C
+0.38 C
1986
6.9 C
+0.61 C
1987
9.2 C
+2.85 C
1988
7.3 C
+0.98 C
1989
5.9 C
-0.43 C
1990
7.7 C
+1.38 C
1991
7.4 C
+1.11 C
1992
6.5 C
+0.12 C
1993
4.9 C
-1.44 C
1994
6.3 C
-0.03 C
1995
6.1 C
-0.27 C
1996
4.4 C
-1.93 C
1997
5.7 C
-0.60 C
1998
7.9 C
+1.59 C
2000
6.5 C
+0.15 C
2001
6.6 C
+0.22 C
2002
6.3 C
-0.04 C
2003
6.0 C
-0.29 C
2004
6.1 C
-0.23 C
2005
7.0 C
+0.71 C
2006
7.3 C
+0.97 C
2007
6.4 C
+0.09 C
2008
4.9 C
-1.46 C
2009
5.0 C
-1.33 C
2010
6.3 C
-0.01 C
2011
5.5 C
-0.80 C
2012
7.8 C
+1.43 C
2013
4.5 C
-1.86 C
2015
7.1 C
+0.73 C
2016
7.5 C
+1.15 C
2018
5.1 C
-1.23 C
2019
4.1 C
-2.21 C
The fitted trend in annual mean temperature here over 1904 to 2019 is -0.01 C (-0.14 to 0.11) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.02 F (-0.25 to 0.20) per decade. The slope is a straight line fitted to 58 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Clear Lake
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.01 C (-0.14 to 0.11) per decade
-0.02 F (-0.25 to 0.20) per decade
1904 to 2019
58
Not clearly different from zero
Mean daily maximum
-0.18 C (-0.33 to -0.03) per decade
-0.3 F (-0.6 to -0.1) per decade
1904 to 2019
58
Fall
Mean daily minimum
0.16 C (0.04 to 0.27) per decade
0.3 F (0.1 to 0.5) per decade
1904 to 2019
58
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
1903 to 2026
Yearly extremes at Clear Lake: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
41.7 C (107.1 F)
1966
35.6 C (96.1 F)
73
Coldest night (TNn)
-38.3 C (-36.9 F)
2019
-31.1 C (-24.0 F)
73
Wettest day (Rx1day)
115.6 mm (4.6 in)
1992
51.1 mm (2.0 in)
92
Wettest five days (Rx5day)
337.4 mm (13.3 in)
1992
80.7 mm (3.2 in)
92
Longest dry spell (CDD)
67 days
1939
29 days
92
Hottest day (TXx)
The hottest day of the year at Clear Lake, 1903 to 2026. The record is 41.7 C (107.1 F) in 1966, marked on the chart; the median year is 35.6 C (96.1 F).
Hottest day (TXx) at Clear Lake by year
Year
Hottest day (TXx)
1903
32.8 C (91.0 F)
1904
35.0 C (95.0 F)
1905
33.9 C (93.0 F)
1906
35.0 C (95.0 F)
1907
33.9 C (93.0 F)
1908
35.6 C (96.1 F)
1909
35.0 C (95.0 F)
1938
n/a
1939
n/a
1940
n/a
1941
n/a
1942
n/a
1943
n/a
1944
n/a
1945
n/a
1946
n/a
1947
n/a
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1952
n/a
1953
n/a
1954
n/a
1955
38.9 C (102.0 F)
1956
35.6 C (96.1 F)
1957
37.2 C (99.0 F)
1958
36.7 C (98.1 F)
1959
37.2 C (99.0 F)
1960
36.1 C (97.0 F)
1961
36.1 C (97.0 F)
1962
35.0 C (95.0 F)
1963
36.1 C (97.0 F)
1964
36.1 C (97.0 F)
1965
37.8 C (100.0 F)
1966
41.7 C (107.1 F)
1967
35.0 C (95.0 F)
1968
36.1 C (97.0 F)
1969
35.6 C (96.1 F)
1970
35.6 C (96.1 F)
1971
36.1 C (97.0 F)
1972
35.0 C (95.0 F)
1973
35.6 C (96.1 F)
1974
36.1 C (97.0 F)
1975
36.1 C (97.0 F)
1976
39.4 C (102.9 F)
1977
35.0 C (95.0 F)
1978
34.4 C (93.9 F)
1979
36.1 C (97.0 F)
1980
34.4 C (93.9 F)
1981
35.6 C (96.1 F)
1982
35.0 C (95.0 F)
1983
35.6 C (96.1 F)
1984
36.7 C (98.1 F)
1985
36.1 C (97.0 F)
1986
32.2 C (90.0 F)
1987
35.6 C (96.1 F)
1988
38.9 C (102.0 F)
1989
35.6 C (96.1 F)
1990
33.9 C (93.0 F)
1991
35.0 C (95.0 F)
1992
32.2 C (90.0 F)
1993
31.1 C (88.0 F)
1994
31.1 C (88.0 F)
1995
34.4 C (93.9 F)
1996
32.8 C (91.0 F)
1997
33.3 C (91.9 F)
1998
32.8 C (91.0 F)
1999
36.7 C (98.1 F)
2000
36.1 C (97.0 F)
2001
35.0 C (95.0 F)
2002
37.2 C (99.0 F)
2003
36.7 C (98.1 F)
2004
32.8 C (91.0 F)
2005
34.4 C (93.9 F)
2006
37.2 C (99.0 F)
2007
36.1 C (97.0 F)
2008
33.3 C (91.9 F)
2009
35.6 C (96.1 F)
2010
33.3 C (91.9 F)
2011
35.0 C (95.0 F)
2012
36.7 C (98.1 F)
2013
32.8 C (91.0 F)
2014
31.1 C (88.0 F)
2015
34.4 C (93.9 F)
2016
34.4 C (93.9 F)
2017
33.9 C (93.0 F)
2018
36.1 C (97.0 F)
2019
32.8 C (91.0 F)
2020
2.8 C (37.0 F)
2025
n/a
2026
n/a
Coldest night (TNn)
The coldest night of the year at Clear Lake, 1903 to 2026. The record is -38.3 C (-36.9 F) in 2019, marked on the chart; the median year is -31.1 C (-24.0 F).
Coldest night (TNn) at Clear Lake by year
Year
Coldest night (TNn)
1903
-30.0 C (-22.0 F)
1904
-36.7 C (-34.1 F)
1905
-34.4 C (-29.9 F)
1906
-30.0 C (-22.0 F)
1907
-33.3 C (-27.9 F)
1908
-30.6 C (-23.1 F)
1909
-34.4 C (-29.9 F)
1938
n/a
1939
n/a
1940
n/a
1941
n/a
1942
n/a
1943
n/a
1944
n/a
1945
n/a
1946
n/a
1947
n/a
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1952
n/a
1953
n/a
1954
n/a
1955
-33.3 C (-27.9 F)
1956
-30.0 C (-22.0 F)
1957
-30.0 C (-22.0 F)
1958
-31.1 C (-24.0 F)
1959
-28.3 C (-18.9 F)
1960
-32.8 C (-27.0 F)
1961
-33.3 C (-27.9 F)
1962
-26.1 C (-15.0 F)
1963
-32.2 C (-26.0 F)
1964
-28.3 C (-18.9 F)
1965
-32.8 C (-27.0 F)
1966
-35.0 C (-31.0 F)
1967
-34.4 C (-29.9 F)
1968
-32.8 C (-27.0 F)
1969
-28.3 C (-18.9 F)
1970
-34.4 C (-29.9 F)
1971
-30.6 C (-23.1 F)
1972
-34.4 C (-29.9 F)
1973
-31.1 C (-24.0 F)
1974
-33.3 C (-27.9 F)
1975
-29.4 C (-20.9 F)
1976
-30.0 C (-22.0 F)
1977
-33.9 C (-29.0 F)
1978
-31.1 C (-24.0 F)
1979
-32.2 C (-26.0 F)
1980
-27.8 C (-18.0 F)
1981
-31.7 C (-25.1 F)
1982
-35.0 C (-31.0 F)
1983
-33.9 C (-29.0 F)
1984
-31.7 C (-25.1 F)
1985
-29.4 C (-20.9 F)
1986
-30.6 C (-23.1 F)
1987
-30.0 C (-22.0 F)
1988
-33.9 C (-29.0 F)
1989
-34.4 C (-29.9 F)
1990
-31.7 C (-25.1 F)
1991
-25.0 C (-13.0 F)
1992
-27.8 C (-18.0 F)
1993
-30.0 C (-22.0 F)
1994
-35.6 C (-32.1 F)
1995
-27.2 C (-17.0 F)
1996
-36.1 C (-33.0 F)
1997
-28.3 C (-18.9 F)
1998
-28.3 C (-18.9 F)
1999
-30.6 C (-23.1 F)
2000
-28.9 C (-20.0 F)
2001
-27.8 C (-18.0 F)
2002
-24.4 C (-11.9 F)
2003
-28.3 C (-18.9 F)
2004
-31.1 C (-24.0 F)
2005
-32.2 C (-26.0 F)
2006
-27.2 C (-17.0 F)
2007
-28.9 C (-20.0 F)
2008
-31.1 C (-24.0 F)
2009
-32.2 C (-26.0 F)
2010
-32.8 C (-27.0 F)
2011
-30.0 C (-22.0 F)
2012
-26.1 C (-15.0 F)
2013
-29.4 C (-20.9 F)
2014
-31.1 C (-24.0 F)
2015
-26.7 C (-16.1 F)
2016
-32.2 C (-26.0 F)
2017
-32.8 C (-27.0 F)
2018
-32.2 C (-26.0 F)
2019
-38.3 C (-36.9 F)
2020
-20.6 C (-5.1 F)
2025
n/a
2026
n/a
Wettest day (Rx1day)
The wettest day of the year at Clear Lake, 1903 to 2026. The record is 115.6 mm (4.6 in) in 1992, marked on the chart; the median year is 51.1 mm (2.0 in).
Wettest day (Rx1day) at Clear Lake by year
Year
Wettest day (Rx1day)
1903
43.2 mm (1.7 in)
1904
57.7 mm (2.3 in)
1905
55.9 mm (2.2 in)
1906
52.1 mm (2.1 in)
1907
41.7 mm (1.6 in)
1908
57.2 mm (2.3 in)
1909
90.4 mm (3.6 in)
1938
65.5 mm (2.6 in)
1939
71.9 mm (2.8 in)
1940
57.2 mm (2.3 in)
1941
32.8 mm (1.3 in)
1942
48.8 mm (1.9 in)
1943
50.5 mm (2.0 in)
1944
49.5 mm (1.9 in)
1945
73.7 mm (2.9 in)
1946
51.3 mm (2.0 in)
1947
44.2 mm (1.7 in)
1948
88.1 mm (3.5 in)
1949
40.6 mm (1.6 in)
1950
37.3 mm (1.5 in)
1951
51.6 mm (2.0 in)
1952
56.9 mm (2.2 in)
1953
41.9 mm (1.6 in)
1954
24.9 mm (1.0 in)
1955
39.9 mm (1.6 in)
1956
57.9 mm (2.3 in)
1957
92.2 mm (3.6 in)
1958
67.3 mm (2.6 in)
1959
50.0 mm (2.0 in)
1960
61.5 mm (2.4 in)
1961
53.3 mm (2.1 in)
1962
48.0 mm (1.9 in)
1963
63.2 mm (2.5 in)
1964
63.5 mm (2.5 in)
1965
56.9 mm (2.2 in)
1966
78.7 mm (3.1 in)
1967
53.6 mm (2.1 in)
1968
38.1 mm (1.5 in)
1969
42.7 mm (1.7 in)
1970
63.8 mm (2.5 in)
1971
82.8 mm (3.3 in)
1972
43.9 mm (1.7 in)
1973
45.5 mm (1.8 in)
1974
44.2 mm (1.7 in)
1975
42.4 mm (1.7 in)
1976
31.8 mm (1.3 in)
1977
56.4 mm (2.2 in)
1978
50.0 mm (2.0 in)
1979
64.0 mm (2.5 in)
1980
49.8 mm (2.0 in)
1981
24.9 mm (1.0 in)
1982
69.6 mm (2.7 in)
1983
47.5 mm (1.9 in)
1984
58.4 mm (2.3 in)
1985
52.3 mm (2.1 in)
1986
49.5 mm (1.9 in)
1987
33.8 mm (1.3 in)
1988
50.8 mm (2.0 in)
1989
45.2 mm (1.8 in)
1990
77.0 mm (3.0 in)
1991
38.1 mm (1.5 in)
1992
115.6 mm (4.6 in)
1993
47.5 mm (1.9 in)
1994
48.8 mm (1.9 in)
1995
72.4 mm (2.9 in)
1996
65.5 mm (2.6 in)
1997
66.0 mm (2.6 in)
1998
44.5 mm (1.8 in)
1999
54.1 mm (2.1 in)
2000
43.2 mm (1.7 in)
2001
81.3 mm (3.2 in)
2002
62.2 mm (2.4 in)
2003
27.9 mm (1.1 in)
2004
74.9 mm (2.9 in)
2005
39.6 mm (1.6 in)
2006
111.8 mm (4.4 in)
2007
48.8 mm (1.9 in)
2008
40.6 mm (1.6 in)
2009
78.7 mm (3.1 in)
2010
49.5 mm (1.9 in)
2011
47.0 mm (1.9 in)
2012
36.8 mm (1.4 in)
2013
76.2 mm (3.0 in)
2014
27.2 mm (1.1 in)
2015
114.8 mm (4.5 in)
2016
73.7 mm (2.9 in)
2017
44.7 mm (1.8 in)
2018
40.9 mm (1.6 in)
2019
62.7 mm (2.5 in)
2020
6.1 mm (0.24 in)
2025
13.5 mm (0.5 in)
2026
96.5 mm (3.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Clear Lake, 1903 to 2026. The record is 337.4 mm (13.3 in) in 1992, marked on the chart; the median year is 80.7 mm (3.2 in).
Wettest five days (Rx5day) at Clear Lake by year
Year
Wettest five days (Rx5day)
1903
72.4 mm (2.9 in)
1904
60.4 mm (2.4 in)
1905
109.9 mm (4.3 in)
1906
81.1 mm (3.2 in)
1907
101.1 mm (4.0 in)
1908
108.0 mm (4.3 in)
1909
146.8 mm (5.8 in)
1938
65.5 mm (2.6 in)
1939
128.8 mm (5.1 in)
1940
73.2 mm (2.9 in)
1941
44.0 mm (1.7 in)
1942
79.5 mm (3.1 in)
1943
57.6 mm (2.3 in)
1944
58.4 mm (2.3 in)
1945
98.8 mm (3.9 in)
1946
81.6 mm (3.2 in)
1947
66.3 mm (2.6 in)
1948
134.8 mm (5.3 in)
1949
59.9 mm (2.4 in)
1950
61.3 mm (2.4 in)
1951
80.3 mm (3.2 in)
1952
100.1 mm (3.9 in)
1953
92.0 mm (3.6 in)
1954
52.9 mm (2.1 in)
1955
63.5 mm (2.5 in)
1956
113.5 mm (4.5 in)
1957
98.1 mm (3.9 in)
1958
68.1 mm (2.7 in)
1959
74.1 mm (2.9 in)
1960
159.6 mm (6.3 in)
1961
92.5 mm (3.6 in)
1962
91.5 mm (3.6 in)
1963
88.9 mm (3.5 in)
1964
78.3 mm (3.1 in)
1965
79.5 mm (3.1 in)
1966
91.9 mm (3.6 in)
1967
101.3 mm (4.0 in)
1968
74.7 mm (2.9 in)
1969
51.8 mm (2.0 in)
1970
83.5 mm (3.3 in)
1971
88.7 mm (3.5 in)
1972
95.4 mm (3.8 in)
1973
64.5 mm (2.5 in)
1974
74.7 mm (2.9 in)
1975
100.4 mm (4.0 in)
1976
38.2 mm (1.5 in)
1977
94.5 mm (3.7 in)
1978
68.6 mm (2.7 in)
1979
72.2 mm (2.8 in)
1980
136.4 mm (5.4 in)
1981
44.0 mm (1.7 in)
1982
98.8 mm (3.9 in)
1983
58.6 mm (2.3 in)
1984
100.9 mm (4.0 in)
1985
86.4 mm (3.4 in)
1986
77.4 mm (3.0 in)
1987
55.1 mm (2.2 in)
1988
61.0 mm (2.4 in)
1989
50.6 mm (2.0 in)
1990
138.0 mm (5.4 in)
1991
88.4 mm (3.5 in)
1992
337.4 mm (13.3 in)
1993
100.6 mm (4.0 in)
1994
90.2 mm (3.6 in)
1995
96.3 mm (3.8 in)
1996
67.3 mm (2.6 in)
1997
73.1 mm (2.9 in)
1998
65.5 mm (2.6 in)
1999
86.9 mm (3.4 in)
2000
54.9 mm (2.2 in)
2001
132.3 mm (5.2 in)
2002
65.0 mm (2.6 in)
2003
44.9 mm (1.8 in)
2004
132.8 mm (5.2 in)
2005
62.5 mm (2.5 in)
2006
142.0 mm (5.6 in)
2007
82.8 mm (3.3 in)
2008
61.2 mm (2.4 in)
2009
135.9 mm (5.4 in)
2010
74.4 mm (2.9 in)
2011
80.0 mm (3.1 in)
2012
55.1 mm (2.2 in)
2013
148.9 mm (5.9 in)
2014
53.3 mm (2.1 in)
2015
140.2 mm (5.5 in)
2016
105.2 mm (4.1 in)
2017
69.4 mm (2.7 in)
2018
100.3 mm (3.9 in)
2019
125.5 mm (4.9 in)
2020
47.2 mm (1.9 in)
2025
27.5 mm (1.1 in)
2026
109.9 mm (4.3 in)
Longest dry spell (CDD)
The longest dry spell of the year at Clear Lake, 1903 to 2026. The record is 67 days in 1939, marked on the chart; the median year is 29 days.
Longest dry spell (CDD) at Clear Lake by year
Year
Longest dry spell (CDD)
1903
28 days
1904
34 days
1905
45 days
1906
42 days
1907
58 days
1908
30 days
1909
21 days
1938
43 days
1939
67 days
1940
23 days
1941
34 days
1942
47 days
1943
53 days
1944
30 days
1945
30 days
1946
36 days
1947
27 days
1948
25 days
1949
58 days
1950
41 days
1951
20 days
1952
56 days
1953
26 days
1954
30 days
1955
21 days
1956
23 days
1957
20 days
1958
37 days
1959
36 days
1960
35 days
1961
36 days
1962
32 days
1963
27 days
1964
58 days
1965
23 days
1966
28 days
1967
34 days
1968
40 days
1969
19 days
1970
36 days
1971
47 days
1972
31 days
1973
39 days
1974
31 days
1975
28 days
1976
32 days
1977
27 days
1978
37 days
1979
21 days
1980
30 days
1981
28 days
1982
32 days
1983
17 days
1984
42 days
1985
27 days
1986
43 days
1987
24 days
1988
28 days
1989
38 days
1990
45 days
1991
33 days
1992
22 days
1993
18 days
1994
30 days
1995
24 days
1996
17 days
1997
20 days
1998
24 days
1999
23 days
2000
19 days
2001
27 days
2002
34 days
2003
20 days
2004
20 days
2005
21 days
2006
26 days
2007
26 days
2008
21 days
2009
26 days
2010
30 days
2011
39 days
2012
34 days
2013
34 days
2014
25 days
2015
27 days
2016
18 days
2017
31 days
2018
24 days
2019
22 days
2020
6 days
2025
16 days
2026
16 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
58 years with a frost
Across 58 years with a frost, the median last spring frost at Clear Lake falls on 10 May and the median first autumn frost on 29 September, which leaves a median of 144 days between them.
Fitted over all years, the growing season changes by +2.1 days per decade at this station.
Frost dates and growing season at Clear Lake
Measure
Median, all years
Earliest period
Recent period (1987 to 2019)
Recent against earliest
Fitted trend
Last spring frost
10 May
n/a
7 May
n/a
-0.7 days per decade
First autumn frost
29 September
n/a
2 October
n/a
+1.4 days per decade
Growing days
144 days
n/a
148 days
n/a
+2.1 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
77 years, 1904 to 2019
A day with at least 53.0 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 118.3 mm (4.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Clear Lake: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
53.0 mm (2.1 in)
5 years
69.7 mm (2.7 in)
10 years
81.1 mm (3.2 in)
25 years
95.8 mm (3.8 in)
50 years
107.0 mm (4.2 in)
100 years
118.3 mm (4.7 in)
Longer than the 77 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, 77 years of values from 1904 to 2019.
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: 115.6 mm (4.6 in) in 1992; 114.8 mm (4.5 in) in 2015; 111.8 mm (4.4 in) in 2006.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Climate Twins
2003 to 2019 against 1961 to 1990
Over 2003 to 2019, Clear Lake had a mean temperature of 6.0 C (42.9 F) and 717.4 mm (28.2 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Rochester Intl AP (United States, 347 km away), Stanley Wwtp (United States, 454 km away) and Worthington 2 NNE (United States, 152 km away).
Climate twins of Clear Lake: stations whose 1961 to 1990 climate is closest to its 2003 to 2019 climate
Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.
Download the Data
Data for Clear Lake standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Clear Lake 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.