Record envelope, standing records and threshold days for Center 4 SSW (USC00051458), Colorado, United States, with 69 years of record.
Key Facts for Center 4 SSW
Center 4 SSW (USC00051458) is a weather station in Colorado, United States at 37.71 latitude and -106.14 longitude, 2,339 m (7,673 ft) above sea level.
The station reports from 1941 to 2009, 69 years of record.
1,464 records set at Center 4 SSW still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Center 4 SSW set a daily record low maximum temperature of 12.2 C (54.0 F) on 23 September 2009.
About the Station
Location: Colorado, United States, 37.71 latitude, -106.14 longitude.
Elevation: 2,339 m (7,673 ft).
Period of record: 1941 to 2009, 69 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 Center 4 SSW. 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 Center 4 SSW, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
15.0 C (59.0 F)
-40.0 C (-40.0 F)
n/a
n/a
Feb
18.3 C (64.9 F)
-35.6 C (-32.1 F)
n/a
n/a
Mar
23.3 C (73.9 F)
-26.7 C (-16.1 F)
n/a
n/a
Apr
28.3 C (82.9 F)
-20.0 C (-4.0 F)
n/a
n/a
May
31.1 C (88.0 F)
-11.1 C (12.0 F)
n/a
n/a
Jun
35.0 C (95.0 F)
-5.0 C (23.0 F)
n/a
n/a
Jul
34.4 C (93.9 F)
-0.6 C (30.9 F)
n/a
n/a
Aug
32.2 C (90.0 F)
-2.2 C (28.0 F)
n/a
n/a
Sep
31.7 C (89.1 F)
-8.9 C (16.0 F)
n/a
n/a
Oct
26.7 C (80.1 F)
-20.0 C (-4.0 F)
n/a
n/a
Nov
20.0 C (68.0 F)
-31.7 C (-25.1 F)
n/a
n/a
Dec
16.1 C (61.0 F)
-40.6 C (-41.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Center 4 SSW still stand. 1954 holds the most, with 68.
Standing records at Center 4 SSW by the year they were set
Year set
Standing records
1942
13
1943
18
1944
11
1945
13
1946
18
1947
10
1948
36
1949
17
1950
18
1951
33
1952
29
1953
26
1954
68
1955
25
1956
30
1957
20
1958
22
1959
30
1960
18
1961
22
1962
31
1963
29
1964
26
1965
20
1966
16
1967
25
1968
17
1969
25
1970
23
1971
30
1972
13
1973
15
1974
12
1975
27
1976
27
1977
19
1978
30
1979
38
1980
21
1981
22
1982
27
1983
15
1984
19
1985
16
1986
24
1987
10
1988
11
1989
15
1990
16
1991
25
1992
20
1993
17
1995
21
1996
21
1997
24
1998
20
1999
26
2000
20
2001
11
2002
16
2003
22
2004
23
2005
25
2006
23
2007
26
2008
16
2009
12
All-Time Record Progression
4 new records
4 all-time records were set at Center 4 SSW between 21 July 1977 and 25 July 1989. Each dot is a new record.
When Center 4 SSW set new all-time records
Date
Kind
Detail
1977-07-21
Record daily precipitation
Record daily precipitation 31.8 mm (1.3 in)
1978-12-09
Record low minimum temperature
Record low minimum temperature -40.6 C (-41.1 F)
1979-06-09
Record daily precipitation
Record daily precipitation 35.6 mm (1.4 in)
1989-07-25
Record daily precipitation
Record daily precipitation 55.4 mm (2.2 in)
Wettest Day of Each Month
Jul: 55.4 mm (2.2 in)
The wettest day on record for each calendar month at Center 4 SSW. The most was 55.4 mm (2.2 in) on 25 July 1989.
Record daily precipitation for each month at Center 4 SSW
Month
Record daily precipitation (mm)
Date
Jan
16.3 mm (0.6 in)
14 January 1960
Feb
16.0 mm (0.6 in)
28 February 1990
Mar
29.5 mm (1.2 in)
18 March 1944
Apr
21.8 mm (0.9 in)
30 April 1999
May
20.1 mm (0.8 in)
1 May 1980
Jun
35.6 mm (1.4 in)
9 June 1979
Jul
55.4 mm (2.2 in)
25 July 1989
Aug
28.2 mm (1.1 in)
2 August 1945
Sep
31.5 mm (1.2 in)
30 September 1959
Oct
22.1 mm (0.9 in)
1 October 1959
Nov
20.8 mm (0.8 in)
16 November 1991
Dec
16.5 mm (0.6 in)
28 December 1983
Period of Record Coverage
1941 to 2009
Complete yearUnder 90 percent of days
69 years of record at Center 4 SSW, 1941 to 2009. 5 years have data for under 90 percent of days and are left out of rankings: 1941, 1943, 1948, 1994, 2009.
Cooler than the station meanWarmer than the station mean
One stripe for each of 63 complete years at Center 4 SSW, 1942 to 2008. Blue stripes are years cooler than the station's own mean of 5.2 C (41.3 F); red stripes are warmer. The coolest year was 1979, at 2.6 C (36.7 F), and the warmest was 1954, at 7.4 C (45.4 F). The strongest colour marks a difference of 2.6 C (4.7 F).
Annual mean temperature at Center 4 SSW as warming stripes, 1942 to 2008
Year
Annual mean temperature
Difference from the station mean
1942
5.1 C
-0.05 C
1944
4.1 C
-1.05 C
1945
5.3 C
+0.13 C
1946
5.8 C
+0.64 C
1947
5.3 C
+0.09 C
1949
4.3 C
-0.84 C
1950
5.7 C
+0.47 C
1951
5.7 C
+0.52 C
1952
4.9 C
-0.26 C
1953
5.9 C
+0.69 C
1954
7.4 C
+2.24 C
1955
5.8 C
+0.57 C
1956
6.2 C
+1.01 C
1957
5.6 C
+0.38 C
1958
6.2 C
+1.00 C
1959
5.3 C
+0.11 C
1960
5.0 C
-0.22 C
1961
5.1 C
-0.09 C
1962
6.2 C
+1.04 C
1963
6.3 C
+1.13 C
1964
4.4 C
-0.79 C
1965
5.4 C
+0.22 C
1966
5.6 C
+0.37 C
1967
5.8 C
+0.61 C
1968
4.6 C
-0.59 C
1969
6.2 C
+0.98 C
1970
5.5 C
+0.35 C
1971
4.5 C
-0.70 C
1972
4.1 C
-1.04 C
1973
3.8 C
-1.43 C
1974
4.2 C
-0.95 C
1975
3.1 C
-2.13 C
1976
3.4 C
-1.83 C
1977
4.5 C
-0.68 C
1978
4.3 C
-0.85 C
1979
2.6 C
-2.58 C
1980
4.9 C
-0.27 C
1981
5.7 C
+0.51 C
1982
4.4 C
-0.78 C
1983
5.2 C
+0.02 C
1984
3.7 C
-1.47 C
1985
4.6 C
-0.59 C
1986
5.8 C
+0.58 C
1987
4.3 C
-0.89 C
1988
4.3 C
-0.88 C
1989
5.7 C
+0.49 C
1990
5.4 C
+0.19 C
1991
4.2 C
-1.00 C
1992
3.0 C
-2.17 C
1993
4.0 C
-1.20 C
1995
6.4 C
+1.25 C
1996
6.3 C
+1.14 C
1997
4.8 C
-0.35 C
1998
5.6 C
+0.43 C
1999
6.5 C
+1.34 C
2000
6.7 C
+1.49 C
2001
6.3 C
+1.10 C
2002
6.1 C
+0.91 C
2003
7.1 C
+1.94 C
2004
5.8 C
+0.59 C
2005
6.9 C
+1.68 C
2007
5.3 C
+0.12 C
2008
4.3 C
-0.90 C
The fitted trend in annual mean temperature here over 1942 to 2008 is 0.01 C (-0.13 to 0.15) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.02 F (-0.23 to 0.27) per decade. The slope is a straight line fitted to 63 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Center 4 SSW
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.01 C (-0.13 to 0.15) per decade
0.02 F (-0.23 to 0.27) per decade
1942 to 2008
63
Not clearly different from zero
Mean daily maximum
-0.11 C (-0.26 to 0.04) per decade
-0.2 F (-0.5 to 0.1) per decade
1942 to 2008
63
Not clearly different from zero
Mean daily minimum
0.14 C (-0.02 to 0.29) per decade
0.24 F (-0.04 to 0.52) per decade
1942 to 2008
63
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
1941 to 2009
Yearly extremes at Center 4 SSW: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
35.0 C (95.0 F)
1954
31.1 C (88.0 F)
69
Coldest night (TNn)
-40.6 C (-41.1 F)
1978
-30.6 C (-23.1 F)
69
Wettest day (Rx1day)
55.4 mm (2.2 in)
1989
17.3 mm (0.7 in)
69
Wettest five days (Rx5day)
67.3 mm (2.6 in)
1959
27.4 mm (1.1 in)
69
Longest dry spell (CDD)
105 days
2002
50 days
69
Hottest day (TXx)
The hottest day of the year at Center 4 SSW, 1941 to 2009. The record is 35.0 C (95.0 F) in 1954, marked on the chart; the median year is 31.1 C (88.0 F).
Hottest day (TXx) at Center 4 SSW by year
Year
Hottest day (TXx)
1941
11.1 C (52.0 F)
1942
30.6 C (87.1 F)
1943
31.7 C (89.1 F)
1944
33.3 C (91.9 F)
1945
30.6 C (87.1 F)
1946
31.7 C (89.1 F)
1947
31.1 C (88.0 F)
1948
30.0 C (86.0 F)
1949
28.9 C (84.0 F)
1950
30.0 C (86.0 F)
1951
32.2 C (90.0 F)
1952
32.8 C (91.0 F)
1953
33.9 C (93.0 F)
1954
35.0 C (95.0 F)
1955
32.8 C (91.0 F)
1956
33.3 C (91.9 F)
1957
34.4 C (93.9 F)
1958
31.7 C (89.1 F)
1959
31.7 C (89.1 F)
1960
30.6 C (87.1 F)
1961
30.0 C (86.0 F)
1962
30.0 C (86.0 F)
1963
32.2 C (90.0 F)
1964
32.2 C (90.0 F)
1965
29.4 C (84.9 F)
1966
30.6 C (87.1 F)
1967
30.6 C (87.1 F)
1968
30.0 C (86.0 F)
1969
31.1 C (88.0 F)
1970
32.2 C (90.0 F)
1971
31.1 C (88.0 F)
1972
29.4 C (84.9 F)
1973
31.7 C (89.1 F)
1974
30.6 C (87.1 F)
1975
29.4 C (84.9 F)
1976
29.4 C (84.9 F)
1977
31.1 C (88.0 F)
1978
29.4 C (84.9 F)
1979
30.0 C (86.0 F)
1980
29.4 C (84.9 F)
1981
31.7 C (89.1 F)
1982
28.9 C (84.0 F)
1983
29.4 C (84.9 F)
1984
29.4 C (84.9 F)
1985
32.2 C (90.0 F)
1986
30.0 C (86.0 F)
1987
31.1 C (88.0 F)
1988
30.0 C (86.0 F)
1989
32.8 C (91.0 F)
1990
32.8 C (91.0 F)
1991
32.2 C (90.0 F)
1992
30.6 C (87.1 F)
1993
31.1 C (88.0 F)
1994
26.1 C (79.0 F)
1995
30.6 C (87.1 F)
1996
31.7 C (89.1 F)
1997
30.0 C (86.0 F)
1998
32.2 C (90.0 F)
1999
31.1 C (88.0 F)
2000
31.7 C (89.1 F)
2001
30.6 C (87.1 F)
2002
32.8 C (91.0 F)
2003
32.8 C (91.0 F)
2004
31.1 C (88.0 F)
2005
33.3 C (91.9 F)
2006
32.2 C (90.0 F)
2007
32.2 C (90.0 F)
2008
30.6 C (87.1 F)
2009
30.0 C (86.0 F)
Coldest night (TNn)
The coldest night of the year at Center 4 SSW, 1941 to 2009. The record is -40.6 C (-41.1 F) in 1978, marked on the chart; the median year is -30.6 C (-23.1 F).
Coldest night (TNn) at Center 4 SSW by year
Year
Coldest night (TNn)
1941
-23.9 C (-11.0 F)
1942
-30.6 C (-23.1 F)
1943
-33.3 C (-27.9 F)
1944
-30.0 C (-22.0 F)
1945
-27.2 C (-17.0 F)
1946
-25.6 C (-14.1 F)
1947
-26.1 C (-15.0 F)
1948
-40.0 C (-40.0 F)
1949
-34.4 C (-29.9 F)
1950
-27.2 C (-17.0 F)
1951
-32.2 C (-26.0 F)
1952
-29.4 C (-20.9 F)
1953
-26.7 C (-16.1 F)
1954
-30.0 C (-22.0 F)
1955
-26.7 C (-16.1 F)
1956
-27.8 C (-18.0 F)
1957
-26.1 C (-15.0 F)
1958
-32.8 C (-27.0 F)
1959
-31.7 C (-25.1 F)
1960
-31.1 C (-24.0 F)
1961
-31.7 C (-25.1 F)
1962
-28.9 C (-20.0 F)
1963
-38.3 C (-36.9 F)
1964
-32.2 C (-26.0 F)
1965
-26.7 C (-16.1 F)
1966
-29.4 C (-20.9 F)
1967
-30.6 C (-23.1 F)
1968
-33.9 C (-29.0 F)
1969
-26.1 C (-15.0 F)
1970
-28.9 C (-20.0 F)
1971
-36.1 C (-33.0 F)
1972
-34.4 C (-29.9 F)
1973
-31.1 C (-24.0 F)
1974
-34.4 C (-29.9 F)
1975
-37.2 C (-35.0 F)
1976
-31.7 C (-25.1 F)
1977
-32.8 C (-27.0 F)
1978
-40.6 C (-41.1 F)
1979
-38.9 C (-38.0 F)
1980
-27.2 C (-17.0 F)
1981
-25.0 C (-13.0 F)
1982
-35.6 C (-32.1 F)
1983
-31.7 C (-25.1 F)
1984
-36.7 C (-34.1 F)
1985
-35.0 C (-31.0 F)
1986
-27.2 C (-17.0 F)
1987
-30.0 C (-22.0 F)
1988
-35.6 C (-32.1 F)
1989
-34.4 C (-29.9 F)
1990
-31.1 C (-24.0 F)
1991
-32.8 C (-27.0 F)
1992
-34.4 C (-29.9 F)
1993
-28.3 C (-18.9 F)
1994
-24.4 C (-11.9 F)
1995
-21.1 C (-6.0 F)
1996
-24.4 C (-11.9 F)
1997
-30.6 C (-23.1 F)
1998
-26.7 C (-16.1 F)
1999
-21.1 C (-6.0 F)
2000
-21.7 C (-7.1 F)
2001
-27.2 C (-17.0 F)
2002
-25.0 C (-13.0 F)
2003
-21.1 C (-6.0 F)
2004
-35.6 C (-32.1 F)
2005
-24.4 C (-11.9 F)
2006
-25.6 C (-14.1 F)
2007
-33.9 C (-29.0 F)
2008
-32.8 C (-27.0 F)
2009
-25.6 C (-14.1 F)
Wettest day (Rx1day)
The wettest day of the year at Center 4 SSW, 1941 to 2009. The record is 55.4 mm (2.2 in) in 1989, marked on the chart; the median year is 17.3 mm (0.7 in).
Wettest day (Rx1day) at Center 4 SSW by year
Year
Wettest day (Rx1day)
1941
17.0 mm (0.7 in)
1942
19.1 mm (0.8 in)
1943
15.7 mm (0.6 in)
1944
29.5 mm (1.2 in)
1945
28.2 mm (1.1 in)
1946
19.1 mm (0.8 in)
1947
17.5 mm (0.7 in)
1948
15.7 mm (0.6 in)
1949
20.8 mm (0.8 in)
1950
11.9 mm (0.5 in)
1951
13.2 mm (0.5 in)
1952
17.5 mm (0.7 in)
1953
26.2 mm (1.0 in)
1954
13.7 mm (0.5 in)
1955
18.8 mm (0.7 in)
1956
15.5 mm (0.6 in)
1957
17.0 mm (0.7 in)
1958
23.4 mm (0.9 in)
1959
31.5 mm (1.2 in)
1960
16.3 mm (0.6 in)
1961
23.9 mm (0.9 in)
1962
19.8 mm (0.8 in)
1963
23.4 mm (0.9 in)
1964
15.7 mm (0.6 in)
1965
25.7 mm (1.0 in)
1966
10.9 mm (0.4 in)
1967
11.7 mm (0.5 in)
1968
16.0 mm (0.6 in)
1969
21.8 mm (0.9 in)
1970
8.9 mm (0.35 in)
1971
17.8 mm (0.7 in)
1972
19.8 mm (0.8 in)
1973
13.5 mm (0.5 in)
1974
12.4 mm (0.5 in)
1975
16.3 mm (0.6 in)
1976
12.2 mm (0.5 in)
1977
31.8 mm (1.3 in)
1978
22.4 mm (0.9 in)
1979
35.6 mm (1.4 in)
1980
20.1 mm (0.8 in)
1981
16.3 mm (0.6 in)
1982
13.7 mm (0.5 in)
1983
16.5 mm (0.6 in)
1984
9.1 mm (0.36 in)
1985
16.5 mm (0.6 in)
1986
18.3 mm (0.7 in)
1987
10.9 mm (0.4 in)
1988
13.5 mm (0.5 in)
1989
55.4 mm (2.2 in)
1990
21.3 mm (0.8 in)
1991
24.1 mm (0.9 in)
1992
27.2 mm (1.1 in)
1993
22.1 mm (0.9 in)
1994
15.0 mm (0.6 in)
1995
23.9 mm (0.9 in)
1996
21.3 mm (0.8 in)
1997
16.5 mm (0.6 in)
1998
15.7 mm (0.6 in)
1999
21.8 mm (0.9 in)
2000
21.1 mm (0.8 in)
2001
19.1 mm (0.8 in)
2002
10.4 mm (0.4 in)
2003
15.0 mm (0.6 in)
2004
17.3 mm (0.7 in)
2005
13.0 mm (0.5 in)
2006
18.0 mm (0.7 in)
2007
14.2 mm (0.6 in)
2008
8.9 mm (0.35 in)
2009
13.0 mm (0.5 in)
Wettest five days (Rx5day)
The wettest five days of the year at Center 4 SSW, 1941 to 2009. The record is 67.3 mm (2.6 in) in 1959, marked on the chart; the median year is 27.4 mm (1.1 in).
Wettest five days (Rx5day) at Center 4 SSW by year
Year
Wettest five days (Rx5day)
1941
25.6 mm (1.0 in)
1942
32.8 mm (1.3 in)
1943
17.0 mm (0.7 in)
1944
35.8 mm (1.4 in)
1945
36.6 mm (1.4 in)
1946
24.1 mm (0.9 in)
1947
28.7 mm (1.1 in)
1948
26.6 mm (1.0 in)
1949
24.8 mm (1.0 in)
1950
17.5 mm (0.7 in)
1951
23.1 mm (0.9 in)
1952
35.3 mm (1.4 in)
1953
33.1 mm (1.3 in)
1954
27.7 mm (1.1 in)
1955
22.6 mm (0.9 in)
1956
15.5 mm (0.6 in)
1957
33.3 mm (1.3 in)
1958
25.4 mm (1.0 in)
1959
67.3 mm (2.6 in)
1960
48.3 mm (1.9 in)
1961
38.1 mm (1.5 in)
1962
21.3 mm (0.8 in)
1963
31.3 mm (1.2 in)
1964
29.3 mm (1.2 in)
1965
34.6 mm (1.4 in)
1966
18.3 mm (0.7 in)
1967
33.6 mm (1.3 in)
1968
29.0 mm (1.1 in)
1969
38.3 mm (1.5 in)
1970
14.5 mm (0.6 in)
1971
21.4 mm (0.8 in)
1972
20.3 mm (0.8 in)
1973
16.8 mm (0.7 in)
1974
19.3 mm (0.8 in)
1975
22.7 mm (0.9 in)
1976
22.3 mm (0.9 in)
1977
38.7 mm (1.5 in)
1978
29.2 mm (1.1 in)
1979
35.9 mm (1.4 in)
1980
27.0 mm (1.1 in)
1981
37.9 mm (1.5 in)
1982
27.6 mm (1.1 in)
1983
29.7 mm (1.2 in)
1984
19.0 mm (0.7 in)
1985
24.7 mm (1.0 in)
1986
27.4 mm (1.1 in)
1987
21.4 mm (0.8 in)
1988
19.3 mm (0.8 in)
1989
64.6 mm (2.5 in)
1990
36.9 mm (1.5 in)
1991
34.5 mm (1.4 in)
1992
47.7 mm (1.9 in)
1993
34.5 mm (1.4 in)
1994
26.4 mm (1.0 in)
1995
61.5 mm (2.4 in)
1996
24.3 mm (1.0 in)
1997
27.9 mm (1.1 in)
1998
24.9 mm (1.0 in)
1999
40.5 mm (1.6 in)
2000
41.7 mm (1.6 in)
2001
25.9 mm (1.0 in)
2002
20.0 mm (0.8 in)
2003
22.4 mm (0.9 in)
2004
22.6 mm (0.9 in)
2005
18.3 mm (0.7 in)
2006
31.2 mm (1.2 in)
2007
29.5 mm (1.2 in)
2008
25.2 mm (1.0 in)
2009
27.4 mm (1.1 in)
Longest dry spell (CDD)
The longest dry spell of the year at Center 4 SSW, 1941 to 2009. The record is 105 days in 2002, marked on the chart; the median year is 50 days.
Longest dry spell (CDD) at Center 4 SSW by year
Year
Longest dry spell (CDD)
1941
34 days
1942
51 days
1943
32 days
1944
40 days
1945
46 days
1946
47 days
1947
35 days
1948
32 days
1949
51 days
1950
61 days
1951
58 days
1952
47 days
1953
50 days
1954
48 days
1955
53 days
1956
51 days
1957
41 days
1958
40 days
1959
30 days
1960
51 days
1961
53 days
1962
62 days
1963
36 days
1964
48 days
1965
37 days
1966
48 days
1967
37 days
1968
59 days
1969
27 days
1970
62 days
1971
53 days
1972
83 days
1973
81 days
1974
89 days
1975
57 days
1976
44 days
1977
46 days
1978
53 days
1979
50 days
1980
77 days
1981
60 days
1982
81 days
1983
50 days
1984
49 days
1985
32 days
1986
51 days
1987
54 days
1988
58 days
1989
87 days
1990
36 days
1991
50 days
1992
41 days
1993
27 days
1994
32 days
1995
55 days
1996
61 days
1997
40 days
1998
68 days
1999
75 days
2000
58 days
2001
44 days
2002
105 days
2003
36 days
2004
33 days
2005
44 days
2006
44 days
2007
48 days
2008
52 days
2009
75 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
63 years with a frost
Across 63 years with a frost, the median last spring frost at Center 4 SSW falls on 8 June and the median first autumn frost on 13 September, which leaves a median of 96 days between them.
In 1977 to 2008 the median growing season was 105 days. That is 13 days more than in 1942 to 1973.
Fitted over all years, the growing season changes by +1.8 days per decade at this station.
Frost dates and growing season at Center 4 SSW
Measure
Median, all years
Earliest period (1942 to 1973)
Recent period (1977 to 2008)
Recent against earliest
Fitted trend
Last spring frost
8 June
9 June
7 June
2 days earlier
-0.9 days per decade
First autumn frost
13 September
12 September
17 September
5 days later
+0.9 days per decade
Growing days
96 days
92 days
105 days
13 days more
+1.8 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
64 years, 1942 to 2008
A day with at least 17.6 mm (0.7 in) of rain is expected about once in 2 years. A day with at least 43.3 mm (1.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Center 4 SSW: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
17.6 mm (0.7 in)
5 years
23.8 mm (0.9 in)
10 years
28.1 mm (1.1 in)
25 years
33.9 mm (1.3 in)
50 years
38.5 mm (1.5 in)
100 years
43.3 mm (1.7 in)
Longer than the 64 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, 64 years of values from 1942 to 2008.
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: 55.4 mm (2.2 in) in 1989; 35.6 mm (1.4 in) in 1979; 31.8 mm (1.3 in) in 1977.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Center 4 SSW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Center 4 SSW 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.