Record envelope, standing records and threshold days for Chaska (USC00211465), Minnesota, United States, with 77 years of record.
Key Facts for Chaska
Chaska (USC00211465) is a weather station in Minnesota, United States at 44.80 latitude and -93.58 longitude, 220 m (720 ft) above sea level.
The station reports from 1925 to 2001, 77 years of record.
1,464 records set at Chaska still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Chaska set a daily record high minimum temperature of 1.7 C (35.1 F) on 16 December 2001.
About the Station
Location: Minnesota, United States, 44.80 latitude, -93.58 longitude.
Elevation: 220 m (720 ft).
Period of record: 1925 to 2001, 77 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 Chaska. 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 Chaska, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
15.6 C (60.1 F)
-41.7 C (-43.1 F)
n/a
n/a
Feb
16.7 C (62.1 F)
-38.3 C (-36.9 F)
n/a
n/a
Mar
28.3 C (82.9 F)
-36.7 C (-34.1 F)
n/a
n/a
Apr
35.0 C (95.0 F)
-15.6 C (3.9 F)
n/a
n/a
May
42.2 C (108.0 F)
-8.3 C (17.1 F)
n/a
n/a
Jun
40.6 C (105.1 F)
-0.6 C (30.9 F)
n/a
n/a
Jul
42.8 C (109.0 F)
5.6 C (42.1 F)
n/a
n/a
Aug
40.6 C (105.1 F)
1.1 C (34.0 F)
n/a
n/a
Sep
38.3 C (100.9 F)
-5.6 C (21.9 F)
n/a
n/a
Oct
33.3 C (91.9 F)
-14.4 C (6.1 F)
n/a
n/a
Nov
26.7 C (80.1 F)
-28.3 C (-18.9 F)
n/a
n/a
Dec
21.1 C (70.0 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 Chaska still stand. 1931 holds the most, with 53.
Standing records at Chaska by the year they were set
Year set
Standing records
1925
37
1926
21
1927
34
1928
31
1929
18
1930
36
1931
53
1932
15
1933
30
1934
38
1935
21
1936
46
1937
24
1938
15
1939
23
1940
28
1941
22
1942
18
1943
18
1944
16
1945
29
1946
15
1947
31
1948
16
1949
19
1950
26
1951
27
1952
13
1953
14
1954
12
1955
11
1956
18
1957
7
1958
12
1959
18
1960
8
1961
8
1962
25
1963
18
1964
23
1965
19
1966
21
1967
23
1968
20
1969
18
1970
14
1971
9
1972
18
1973
17
1974
15
1975
10
1976
12
1977
25
1979
6
1980
10
1981
21
1982
16
1983
22
1984
10
1985
21
1986
13
1987
23
1988
18
1989
17
1990
27
1991
22
1992
13
1993
6
1994
7
1995
11
1996
10
1997
14
1998
23
1999
14
2000
18
2001
7
All-Time Record Progression
6 new records
6 all-time records were set at Chaska between 8 July 1955 and 1 November 1991. Each dot is a new record.
When Chaska set new all-time records
Date
Kind
Detail
1955-07-08
Record daily precipitation
Record daily precipitation 126.0 mm (5.0 in)
1977-03-03
Record daily snowfall
Record daily snowfall 33.0 cm (13.0 in)
1982-01-23
Record daily snowfall
Record daily snowfall 40.6 cm (16.0 in)
1987-07-21
Record daily precipitation
Record daily precipitation 198.9 mm (7.8 in)
1988-08-17
Record high minimum temperature
Record high minimum temperature 27.2 C (81.0 F)
1991-11-01
Record daily snowfall
Record daily snowfall 50.8 cm (20.0 in)
Wettest Day of Each Month
Jul: 198.9 mm (7.8 in)
The wettest day on record for each calendar month at Chaska. The most was 198.9 mm (7.8 in) on 21 July 1987.
Record daily precipitation for each month at Chaska
Month
Record daily precipitation (mm)
Date
Jan
38.1 mm (1.5 in)
13 January 1999
Feb
27.2 mm (1.1 in)
2 February 1957
Mar
71.1 mm (2.8 in)
15 March 1971
Apr
49.5 mm (1.9 in)
30 April 1954
May
100.3 mm (3.9 in)
29 May 1937
Jun
111.8 mm (4.4 in)
9 June 1927
Jul
198.9 mm (7.8 in)
21 July 1987
Aug
82.8 mm (3.3 in)
13 August 1957
Sep
92.5 mm (3.6 in)
1 September 1942
Oct
100.3 mm (3.9 in)
20 October 1934
Nov
63.5 mm (2.5 in)
20 November 1973
Dec
50.8 mm (2.0 in)
3 December 1986
Period of Record Coverage
1925 to 2001
Complete yearUnder 90 percent of days
76 years of record at Chaska, 1925 to 2001. 6 years have data for under 90 percent of days and are left out of rankings: 1925, 1965, 1977, 1979, 2000, 2001.
Cooler than the station meanWarmer than the station mean
One stripe for each of 67 complete years at Chaska, 1926 to 1999. Blue stripes are years cooler than the station's own mean of 7.4 C (45.4 F); red stripes are warmer. The coolest year was 1951, at 5.2 C (41.3 F), and the warmest was 1987, at 10.4 C (50.7 F). The strongest colour marks a difference of 3.0 C (5.4 F).
Annual mean temperature at Chaska as warming stripes, 1926 to 1999
Year
Annual mean temperature
Difference from the station mean
1926
6.0 C
-1.42 C
1927
6.7 C
-0.77 C
1928
7.7 C
+0.21 C
1929
5.8 C
-1.63 C
1930
7.8 C
+0.31 C
1931
10.4 C
+2.95 C
1932
7.0 C
-0.47 C
1933
8.4 C
+0.92 C
1934
8.6 C
+1.17 C
1935
7.3 C
-0.16 C
1936
6.2 C
-1.27 C
1937
6.3 C
-1.11 C
1938
8.0 C
+0.60 C
1939
8.3 C
+0.87 C
1940
6.8 C
-0.61 C
1941
8.4 C
+0.96 C
1942
7.5 C
+0.01 C
1943
6.3 C
-1.11 C
1944
7.7 C
+0.24 C
1945
5.8 C
-1.68 C
1946
7.3 C
-0.15 C
1947
6.5 C
-0.94 C
1948
7.2 C
-0.23 C
1949
8.3 C
+0.87 C
1950
5.3 C
-2.16 C
1951
5.2 C
-2.28 C
1952
7.5 C
+0.04 C
1953
8.1 C
+0.70 C
1954
7.9 C
+0.49 C
1955
7.4 C
+0.00 C
1956
7.1 C
-0.30 C
1957
7.7 C
+0.26 C
1958
7.9 C
+0.41 C
1959
7.8 C
+0.32 C
1960
7.1 C
-0.37 C
1961
7.7 C
+0.21 C
1962
6.9 C
-0.55 C
1963
7.1 C
-0.30 C
1964
7.2 C
-0.24 C
1966
5.8 C
-1.69 C
1967
5.8 C
-1.68 C
1968
7.6 C
+0.15 C
1969
6.5 C
-0.97 C
1970
5.8 C
-1.63 C
1971
6.6 C
-0.89 C
1972
6.0 C
-1.42 C
1974
7.6 C
+0.14 C
1975
7.3 C
-0.13 C
1976
7.5 C
+0.10 C
1980
8.0 C
+0.54 C
1981
8.5 C
+1.08 C
1982
7.1 C
-0.32 C
1983
7.9 C
+0.45 C
1984
7.8 C
+0.37 C
1985
6.7 C
-0.71 C
1986
8.2 C
+0.76 C
1987
10.4 C
+2.96 C
1988
8.4 C
+0.99 C
1989
7.1 C
-0.36 C
1990
9.0 C
+1.55 C
1991
8.2 C
+0.79 C
1992
7.9 C
+0.49 C
1993
6.7 C
-0.70 C
1994
7.8 C
+0.33 C
1995
7.9 C
+0.41 C
1998
10.2 C
+2.80 C
1999
10.0 C
+2.55 C
The annual mean temperature here has risen by 0.15 C (0.02 to 0.27) per decade over 1926 to 1999. In Fahrenheit: 0.27 F (0.04 to 0.49) per decade. The slope is a straight line fitted to 67 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Chaska
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.15 C (0.02 to 0.27) per decade
0.27 F (0.04 to 0.49) per decade
1926 to 1999
67
Rise
Mean daily maximum
0.1 C (-0.1 to 0.2) per decade
0.2 F (-0.1 to 0.4) per decade
1926 to 1999
67
Not clearly different from zero
Mean daily minimum
0.2 C (0.1 to 0.3) per decade
0.4 F (0.2 to 0.6) per decade
1926 to 1999
67
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
1925 to 2001
Yearly extremes at Chaska: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
42.8 C (109.0 F)
1936
36.7 C (98.1 F)
76
Coldest night (TNn)
-41.7 C (-43.1 F)
1951
-32.2 C (-26.0 F)
76
Wettest day (Rx1day)
198.9 mm (7.8 in)
1987
56.6 mm (2.2 in)
76
Wettest five days (Rx5day)
281.5 mm (11.1 in)
1987
92.1 mm (3.6 in)
76
Longest dry spell (CDD)
97 days
2001
26 days
76
Hottest day (TXx)
The hottest day of the year at Chaska, 1925 to 2001. The record is 42.8 C (109.0 F) in 1936, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Chaska by year
Year
Hottest day (TXx)
1925
37.8 C (100.0 F)
1926
39.4 C (102.9 F)
1927
35.6 C (96.1 F)
1928
35.0 C (95.0 F)
1929
35.6 C (96.1 F)
1930
37.8 C (100.0 F)
1931
40.6 C (105.1 F)
1932
38.3 C (100.9 F)
1933
38.3 C (100.9 F)
1934
42.2 C (108.0 F)
1935
38.3 C (100.9 F)
1936
42.8 C (109.0 F)
1937
40.0 C (104.0 F)
1938
35.6 C (96.1 F)
1939
36.7 C (98.1 F)
1940
40.0 C (104.0 F)
1941
38.9 C (102.0 F)
1942
37.8 C (100.0 F)
1943
37.2 C (99.0 F)
1944
35.6 C (96.1 F)
1945
35.0 C (95.0 F)
1946
36.1 C (97.0 F)
1947
40.6 C (105.1 F)
1948
38.9 C (102.0 F)
1949
40.0 C (104.0 F)
1950
36.7 C (98.1 F)
1951
35.0 C (95.0 F)
1952
33.9 C (93.0 F)
1953
35.0 C (95.0 F)
1954
34.4 C (93.9 F)
1955
37.2 C (99.0 F)
1956
37.8 C (100.0 F)
1957
35.0 C (95.0 F)
1958
35.0 C (95.0 F)
1959
35.0 C (95.0 F)
1960
35.0 C (95.0 F)
1961
37.2 C (99.0 F)
1962
33.9 C (93.0 F)
1963
37.2 C (99.0 F)
1964
36.7 C (98.1 F)
1965
36.1 C (97.0 F)
1966
38.3 C (100.9 F)
1967
32.2 C (90.0 F)
1968
36.7 C (98.1 F)
1969
35.6 C (96.1 F)
1970
36.1 C (97.0 F)
1971
35.6 C (96.1 F)
1972
37.2 C (99.0 F)
1973
37.2 C (99.0 F)
1974
38.3 C (100.9 F)
1975
36.7 C (98.1 F)
1976
39.4 C (102.9 F)
1977
36.7 C (98.1 F)
1979
33.9 C (93.0 F)
1980
37.2 C (99.0 F)
1981
33.3 C (91.9 F)
1982
37.2 C (99.0 F)
1983
36.1 C (97.0 F)
1984
35.0 C (95.0 F)
1985
38.9 C (102.0 F)
1986
34.4 C (93.9 F)
1987
38.3 C (100.9 F)
1988
41.7 C (107.1 F)
1989
35.6 C (96.1 F)
1990
39.4 C (102.9 F)
1991
35.6 C (96.1 F)
1992
33.9 C (93.0 F)
1993
32.2 C (90.0 F)
1994
35.0 C (95.0 F)
1995
38.3 C (100.9 F)
1996
35.6 C (96.1 F)
1997
35.6 C (96.1 F)
1998
35.6 C (96.1 F)
1999
37.2 C (99.0 F)
2000
35.6 C (96.1 F)
2001
30.6 C (87.1 F)
Coldest night (TNn)
The coldest night of the year at Chaska, 1925 to 2001. The record is -41.7 C (-43.1 F) in 1951, marked on the chart; the median year is -32.2 C (-26.0 F).
Coldest night (TNn) at Chaska by year
Year
Coldest night (TNn)
1925
-25.6 C (-14.1 F)
1926
-31.7 C (-25.1 F)
1927
-35.0 C (-31.0 F)
1928
-31.7 C (-25.1 F)
1929
-37.2 C (-35.0 F)
1930
-32.8 C (-27.0 F)
1931
-21.7 C (-7.1 F)
1932
-31.7 C (-25.1 F)
1933
-33.9 C (-29.0 F)
1934
-30.0 C (-22.0 F)
1935
-40.0 C (-40.0 F)
1936
-38.3 C (-36.9 F)
1937
-34.4 C (-29.9 F)
1938
-27.8 C (-18.0 F)
1939
-31.7 C (-25.1 F)
1940
-34.4 C (-29.9 F)
1941
-30.0 C (-22.0 F)
1942
-30.6 C (-23.1 F)
1943
-35.6 C (-32.1 F)
1944
-26.7 C (-16.1 F)
1945
-30.6 C (-23.1 F)
1946
-33.9 C (-29.0 F)
1947
-31.7 C (-25.1 F)
1948
-35.6 C (-32.1 F)
1949
-32.8 C (-27.0 F)
1950
-36.1 C (-33.0 F)
1951
-41.7 C (-43.1 F)
1952
-33.3 C (-27.9 F)
1953
-31.1 C (-24.0 F)
1954
-32.8 C (-27.0 F)
1955
-32.2 C (-26.0 F)
1956
-32.2 C (-26.0 F)
1957
-29.4 C (-20.9 F)
1958
-27.8 C (-18.0 F)
1959
-30.0 C (-22.0 F)
1960
-30.0 C (-22.0 F)
1961
-28.9 C (-20.0 F)
1962
-36.7 C (-34.1 F)
1963
-34.4 C (-29.9 F)
1964
-26.1 C (-15.0 F)
1965
-32.8 C (-27.0 F)
1966
-33.3 C (-27.9 F)
1967
-37.2 C (-35.0 F)
1968
-30.6 C (-23.1 F)
1969
-30.0 C (-22.0 F)
1970
-37.2 C (-35.0 F)
1971
-33.3 C (-27.9 F)
1972
-35.0 C (-31.0 F)
1973
-31.7 C (-25.1 F)
1974
-34.4 C (-29.9 F)
1975
-31.7 C (-25.1 F)
1976
-33.3 C (-27.9 F)
1977
-38.3 C (-36.9 F)
1979
-21.1 C (-6.0 F)
1980
-27.2 C (-17.0 F)
1981
-30.6 C (-23.1 F)
1982
-36.1 C (-33.0 F)
1983
-37.2 C (-35.0 F)
1984
-33.3 C (-27.9 F)
1985
-33.9 C (-29.0 F)
1986
-32.8 C (-27.0 F)
1987
-26.1 C (-15.0 F)
1988
-37.2 C (-35.0 F)
1989
-31.7 C (-25.1 F)
1990
-33.3 C (-27.9 F)
1991
-27.8 C (-18.0 F)
1992
-26.7 C (-16.1 F)
1993
-28.3 C (-18.9 F)
1994
-35.6 C (-32.1 F)
1995
-26.7 C (-16.1 F)
1996
-38.3 C (-36.9 F)
1997
-22.2 C (-8.0 F)
1998
-24.4 C (-11.9 F)
1999
-29.4 C (-20.9 F)
2000
-33.3 C (-27.9 F)
2001
-8.9 C (16.0 F)
Wettest day (Rx1day)
The wettest day of the year at Chaska, 1925 to 2001. The record is 198.9 mm (7.8 in) in 1987, marked on the chart; the median year is 56.6 mm (2.2 in).
Wettest day (Rx1day) at Chaska by year
Year
Wettest day (Rx1day)
1925
72.4 mm (2.9 in)
1926
78.7 mm (3.1 in)
1927
111.8 mm (4.4 in)
1928
52.1 mm (2.1 in)
1929
69.9 mm (2.8 in)
1930
73.7 mm (2.9 in)
1931
34.5 mm (1.4 in)
1932
72.9 mm (2.9 in)
1933
49.5 mm (1.9 in)
1934
100.3 mm (3.9 in)
1935
40.9 mm (1.6 in)
1936
27.4 mm (1.1 in)
1937
100.3 mm (3.9 in)
1938
54.4 mm (2.1 in)
1939
45.7 mm (1.8 in)
1940
39.6 mm (1.6 in)
1941
51.3 mm (2.0 in)
1942
92.5 mm (3.6 in)
1943
58.9 mm (2.3 in)
1944
108.7 mm (4.3 in)
1945
71.1 mm (2.8 in)
1946
27.4 mm (1.1 in)
1947
37.8 mm (1.5 in)
1948
75.2 mm (3.0 in)
1949
121.2 mm (4.8 in)
1950
33.5 mm (1.3 in)
1951
100.3 mm (3.9 in)
1952
53.1 mm (2.1 in)
1953
55.1 mm (2.2 in)
1954
55.4 mm (2.2 in)
1955
126.0 mm (5.0 in)
1956
63.5 mm (2.5 in)
1957
84.1 mm (3.3 in)
1958
40.6 mm (1.6 in)
1959
71.9 mm (2.8 in)
1960
89.2 mm (3.5 in)
1961
64.5 mm (2.5 in)
1962
55.9 mm (2.2 in)
1963
34.8 mm (1.4 in)
1964
44.7 mm (1.8 in)
1965
68.8 mm (2.7 in)
1966
56.6 mm (2.2 in)
1967
37.3 mm (1.5 in)
1968
86.4 mm (3.4 in)
1969
30.5 mm (1.2 in)
1970
53.3 mm (2.1 in)
1971
71.1 mm (2.8 in)
1972
39.9 mm (1.6 in)
1973
63.5 mm (2.5 in)
1974
68.3 mm (2.7 in)
1975
56.6 mm (2.2 in)
1976
51.1 mm (2.0 in)
1977
45.0 mm (1.8 in)
1979
39.1 mm (1.5 in)
1980
42.9 mm (1.7 in)
1981
73.4 mm (2.9 in)
1982
38.4 mm (1.5 in)
1983
50.5 mm (2.0 in)
1984
65.0 mm (2.6 in)
1985
45.7 mm (1.8 in)
1986
68.1 mm (2.7 in)
1987
198.9 mm (7.8 in)
1988
74.2 mm (2.9 in)
1989
53.6 mm (2.1 in)
1990
56.4 mm (2.2 in)
1991
66.8 mm (2.6 in)
1992
105.2 mm (4.1 in)
1993
64.0 mm (2.5 in)
1994
60.2 mm (2.4 in)
1995
45.7 mm (1.8 in)
1996
47.8 mm (1.9 in)
1997
77.7 mm (3.1 in)
1998
64.5 mm (2.5 in)
1999
47.2 mm (1.9 in)
2000
39.1 mm (1.5 in)
2001
0.0 mm (0.00 in)
Wettest five days (Rx5day)
The wettest five days of the year at Chaska, 1925 to 2001. The record is 281.5 mm (11.1 in) in 1987, marked on the chart; the median year is 92.1 mm (3.6 in).
Wettest five days (Rx5day) at Chaska by year
Year
Wettest five days (Rx5day)
1925
126.0 mm (5.0 in)
1926
82.0 mm (3.2 in)
1927
124.3 mm (4.9 in)
1928
65.0 mm (2.6 in)
1929
66.8 mm (2.6 in)
1930
77.0 mm (3.0 in)
1931
64.2 mm (2.5 in)
1932
78.8 mm (3.1 in)
1933
72.4 mm (2.9 in)
1934
102.8 mm (4.0 in)
1935
61.7 mm (2.4 in)
1936
55.1 mm (2.2 in)
1937
124.4 mm (4.9 in)
1938
122.5 mm (4.8 in)
1939
103.1 mm (4.1 in)
1940
91.4 mm (3.6 in)
1941
109.0 mm (4.3 in)
1942
99.6 mm (3.9 in)
1943
113.3 mm (4.5 in)
1944
127.8 mm (5.0 in)
1945
115.9 mm (4.6 in)
1946
91.7 mm (3.6 in)
1947
49.3 mm (1.9 in)
1948
137.2 mm (5.4 in)
1949
150.5 mm (5.9 in)
1950
47.2 mm (1.9 in)
1951
107.7 mm (4.2 in)
1952
101.9 mm (4.0 in)
1953
109.7 mm (4.3 in)
1954
111.7 mm (4.4 in)
1955
163.6 mm (6.4 in)
1956
149.6 mm (5.9 in)
1957
117.9 mm (4.6 in)
1958
52.2 mm (2.1 in)
1959
112.3 mm (4.4 in)
1960
165.4 mm (6.5 in)
1961
89.6 mm (3.5 in)
1962
76.7 mm (3.0 in)
1963
59.9 mm (2.4 in)
1964
70.6 mm (2.8 in)
1965
120.9 mm (4.8 in)
1966
78.5 mm (3.1 in)
1967
89.2 mm (3.5 in)
1968
166.1 mm (6.5 in)
1969
59.0 mm (2.3 in)
1970
95.6 mm (3.8 in)
1971
93.9 mm (3.7 in)
1972
58.7 mm (2.3 in)
1973
73.7 mm (2.9 in)
1974
116.5 mm (4.6 in)
1975
86.8 mm (3.4 in)
1976
61.5 mm (2.4 in)
1977
68.9 mm (2.7 in)
1979
54.1 mm (2.1 in)
1980
86.1 mm (3.4 in)
1981
97.4 mm (3.8 in)
1982
73.3 mm (2.9 in)
1983
87.6 mm (3.4 in)
1984
171.4 mm (6.7 in)
1985
70.9 mm (2.8 in)
1986
92.5 mm (3.6 in)
1987
281.5 mm (11.1 in)
1988
100.6 mm (4.0 in)
1989
58.7 mm (2.3 in)
1990
113.8 mm (4.5 in)
1991
110.7 mm (4.4 in)
1992
108.2 mm (4.3 in)
1993
157.7 mm (6.2 in)
1994
77.2 mm (3.0 in)
1995
67.6 mm (2.7 in)
1996
78.2 mm (3.1 in)
1997
133.6 mm (5.3 in)
1998
99.8 mm (3.9 in)
1999
87.6 mm (3.4 in)
2000
47.7 mm (1.9 in)
2001
0.0 mm (0.00 in)
Longest dry spell (CDD)
The longest dry spell of the year at Chaska, 1925 to 2001. The record is 97 days in 2001, marked on the chart; the median year is 26 days.
Longest dry spell (CDD) at Chaska by year
Year
Longest dry spell (CDD)
1925
26 days
1926
24 days
1927
18 days
1928
24 days
1929
15 days
1930
21 days
1931
37 days
1932
17 days
1933
26 days
1934
25 days
1935
25 days
1936
30 days
1937
37 days
1938
23 days
1939
31 days
1940
25 days
1941
19 days
1942
39 days
1943
53 days
1944
27 days
1945
17 days
1946
14 days
1947
28 days
1948
22 days
1949
22 days
1950
15 days
1951
18 days
1952
47 days
1953
26 days
1954
50 days
1955
23 days
1956
40 days
1957
28 days
1958
31 days
1959
39 days
1960
66 days
1961
26 days
1962
30 days
1963
27 days
1964
39 days
1965
22 days
1966
24 days
1967
47 days
1968
40 days
1969
23 days
1970
34 days
1971
17 days
1972
23 days
1973
22 days
1974
31 days
1975
18 days
1976
32 days
1977
18 days
1979
17 days
1980
30 days
1981
30 days
1982
34 days
1983
21 days
1984
24 days
1985
20 days
1986
28 days
1987
29 days
1988
28 days
1989
25 days
1990
27 days
1991
21 days
1992
24 days
1993
28 days
1994
23 days
1995
28 days
1996
25 days
1997
19 days
1998
25 days
1999
26 days
2000
24 days
2001
97 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
67 years with a frost
Across 67 years with a frost, the median last spring frost at Chaska falls on 4 May and the median first autumn frost on 29 September, which leaves a median of 149 days between them.
In 1963 to 1999 the median growing season was 156 days. That is 15 days more than in 1926 to 1955.
Fitted over all years, the growing season changes by +2.8 days per decade at this station.
Frost dates and growing season at Chaska
Measure
Median, all years
Earliest period (1926 to 1955)
Recent period (1963 to 1999)
Recent against earliest
Fitted trend
Last spring frost
4 May
12 May
2 May
10 days earlier
-2.2 days per decade
First autumn frost
29 September
28 September
2 October
4 days later
+0.5 days per decade
Growing days
149 days
141 days
156 days
15 days more
+2.8 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
71 years, 1926 to 1999
A day with at least 58.3 mm (2.3 in) of rain is expected about once in 2 years. A day with at least 162.7 mm (6.4 in) of rain is expected about once in 100 years.
Rainfall return levels at Chaska: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
58.3 mm (2.3 in)
5 years
81.2 mm (3.2 in)
10 years
98.2 mm (3.9 in)
25 years
122.0 mm (4.8 in)
50 years
141.6 mm (5.6 in)
100 years
162.7 mm (6.4 in)
Longer than the 71 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, 71 years of values from 1926 to 1999.
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: 198.9 mm (7.8 in) in 1987; 126.0 mm (5.0 in) in 1955; 121.2 mm (4.8 in) in 1949.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Chaska, at 1971. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1971 ran 0.6 C (1.1 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Chaska, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1971
+0.6
+1.1
likely
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 Chaska standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Chaska 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.