Record envelope, standing records and threshold days for Stephenson 5WSW (USC00207867), Michigan, United States, with 71 years of record.
Key Facts for Stephenson 5WSW
Stephenson 5WSW (USC00207867) is a weather station in Michigan, United States at 45.39 latitude and -87.70 longitude, 210 m (690 ft) above sea level.
The station reports from 1938 to 2008, 71 years of record.
1,464 records set at Stephenson 5WSW still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Stephenson 5WSW set a daily record high maximum temperature of 32.8 C (91.0 F) on 3 September 2008.
About the Station
Location: Michigan, United States, 45.39 latitude, -87.70 longitude.
Elevation: 210 m (690 ft).
Period of record: 1938 to 2008, 71 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 Stephenson 5WSW. 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 Stephenson 5WSW, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
13.3 C (55.9 F)
-39.4 C (-38.9 F)
n/a
n/a
Feb
14.4 C (57.9 F)
-42.8 C (-45.0 F)
n/a
n/a
Mar
25.6 C (78.1 F)
-35.6 C (-32.1 F)
n/a
n/a
Apr
32.8 C (91.0 F)
-17.8 C (0.0 F)
n/a
n/a
May
33.9 C (93.0 F)
-8.3 C (17.1 F)
n/a
n/a
Jun
36.7 C (98.1 F)
-3.3 C (26.1 F)
n/a
n/a
Jul
38.3 C (100.9 F)
0.0 C (32.0 F)
n/a
n/a
Aug
37.2 C (99.0 F)
-1.7 C (28.9 F)
n/a
n/a
Sep
34.4 C (93.9 F)
-6.1 C (21.0 F)
n/a
n/a
Oct
31.1 C (88.0 F)
-10.6 C (12.9 F)
n/a
n/a
Nov
24.4 C (75.9 F)
-25.0 C (-13.0 F)
n/a
n/a
Dec
16.7 C (62.1 F)
-35.0 C (-31.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Stephenson 5WSW still stand. 1964 holds the most, with 43.
Standing records at Stephenson 5WSW by the year they were set
Year set
Standing records
1948
12
1949
29
1950
32
1951
30
1952
25
1953
27
1954
27
1955
30
1956
30
1957
14
1958
22
1959
24
1960
14
1961
9
1962
23
1963
38
1964
43
1965
29
1966
18
1967
32
1968
33
1969
16
1970
19
1971
27
1972
20
1973
26
1974
27
1975
24
1976
43
1977
27
1978
13
1979
18
1980
15
1981
19
1982
28
1983
17
1984
7
1985
27
1986
28
1987
32
1988
32
1989
42
1990
21
1991
34
1992
23
1993
21
1994
32
1995
28
1996
30
1997
23
1998
20
1999
19
2000
25
2001
20
2002
25
2003
24
2004
14
2005
18
2006
12
2007
15
2008
12
All-Time Record Progression
5 new records
5 all-time records were set at Stephenson 5WSW between 17 January 1982 and 1 February 1997. Each dot is a new record.
When Stephenson 5WSW set new all-time records
Date
Kind
Detail
1982-01-17
Record low minimum temperature
Record low minimum temperature -39.4 C (-38.9 F)
1994-01-19
Record low maximum temperature
Record low maximum temperature -25.0 C (-13.0 F)
1996-02-03
Record low minimum temperature
Record low minimum temperature -42.8 C (-45.0 F)
1997-01-31
Record snow depth
Record snow depth 91.4 cm (36.0 in)
1997-02-01
Record snow depth
Record snow depth 94.0 cm (37.0 in)
Wettest Day of Each Month
Aug: 123.2 mm (4.9 in)
The wettest day on record for each calendar month at Stephenson 5WSW. The most was 123.2 mm (4.9 in) on 29 August 1941.
Record daily precipitation for each month at Stephenson 5WSW
Month
Record daily precipitation (mm)
Date
Jan
42.9 mm (1.7 in)
19 January 1996
Feb
36.6 mm (1.4 in)
28 February 1948
Mar
43.2 mm (1.7 in)
14 March 1990
Apr
52.1 mm (2.1 in)
25 April 2002
May
55.4 mm (2.2 in)
30 May 1994
Jun
109.7 mm (4.3 in)
7 June 1968
Jul
90.4 mm (3.6 in)
17 July 1942
Aug
123.2 mm (4.9 in)
29 August 1941
Sep
87.6 mm (3.4 in)
7 September 1959
Oct
65.8 mm (2.6 in)
4 October 1942
Nov
59.7 mm (2.4 in)
2 November 1985
Dec
27.4 mm (1.1 in)
28 December 1959
Period of Record Coverage
1948 to 2008
Complete yearUnder 90 percent of days
61 years of record at Stephenson 5WSW, 1948 to 2008. 8 years have data for under 90 percent of days and are left out of rankings: 1948, 1983, 1984, 1998, 2005, 2006, 2007, 2008.
Cooler than the station meanWarmer than the station mean
One stripe for each of 52 complete years at Stephenson 5WSW, 1949 to 2004. Blue stripes are years cooler than the station's own mean of 5.7 C (42.3 F); red stripes are warmer. The coolest year was 1996, at 4.0 C (39.1 F), and the warmest was 2001, at 7.2 C (45.0 F). The strongest colour marks a difference of 1.8 C (3.2 F).
Annual mean temperature at Stephenson 5WSW as warming stripes, 1949 to 2004
Year
Annual mean temperature
Difference from the station mean
1949
6.9 C
+1.14 C
1950
4.4 C
-1.31 C
1951
5.2 C
-0.48 C
1952
6.6 C
+0.90 C
1953
7.0 C
+1.29 C
1954
6.2 C
+0.53 C
1955
6.5 C
+0.76 C
1956
5.5 C
-0.18 C
1957
5.6 C
-0.07 C
1958
5.6 C
-0.13 C
1959
5.3 C
-0.39 C
1960
5.7 C
+0.01 C
1961
6.0 C
+0.32 C
1962
5.2 C
-0.47 C
1963
5.3 C
-0.43 C
1964
6.3 C
+0.57 C
1965
5.3 C
-0.39 C
1966
5.8 C
+0.09 C
1967
5.1 C
-0.62 C
1968
6.4 C
+0.70 C
1969
6.0 C
+0.27 C
1970
6.1 C
+0.35 C
1971
5.8 C
+0.12 C
1972
4.8 C
-0.96 C
1973
7.1 C
+1.41 C
1974
5.7 C
+0.03 C
1975
6.5 C
+0.79 C
1976
5.3 C
-0.41 C
1977
6.2 C
+0.52 C
1978
5.3 C
-0.39 C
1979
5.2 C
-0.47 C
1980
6.1 C
+0.35 C
1981
6.4 C
+0.70 C
1982
5.4 C
-0.31 C
1985
4.6 C
-1.12 C
1986
5.5 C
-0.21 C
1987
7.2 C
+1.47 C
1988
5.4 C
-0.29 C
1989
4.3 C
-1.46 C
1990
6.0 C
+0.29 C
1991
6.0 C
+0.24 C
1992
5.0 C
-0.71 C
1993
4.9 C
-0.85 C
1994
5.3 C
-0.37 C
1995
5.3 C
-0.46 C
1996
4.0 C
-1.75 C
1997
5.1 C
-0.61 C
2000
6.2 C
+0.48 C
2001
7.2 C
+1.49 C
2002
6.4 C
+0.64 C
2003
5.4 C
-0.35 C
2004
5.6 C
-0.08 C
The fitted trend in annual mean temperature here over 1949 to 2004 is -0.1 C (-0.2 to 0.1) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.4 to 0.1) per decade. The slope is a straight line fitted to 52 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Stephenson 5WSW
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.1 C (-0.2 to 0.1) per decade
-0.1 F (-0.4 to 0.1) per decade
1949 to 2004
52
Not clearly different from zero
Mean daily maximum
0.03 C (-0.11 to 0.16) per decade
0.05 F (-0.19 to 0.28) per decade
1949 to 2004
52
Not clearly different from zero
Mean daily minimum
-0.17 C (-0.31 to -0.02) per decade
-0.30 F (-0.56 to -0.04) per decade
1949 to 2004
52
Fall
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
1938 to 2008
Yearly extremes at Stephenson 5WSW: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
38.3 C (100.9 F)
1955
34.4 C (93.9 F)
61
Coldest night (TNn)
-42.8 C (-45.0 F)
1996
-30.0 C (-22.0 F)
61
Wettest day (Rx1day)
123.2 mm (4.9 in)
1941
47.8 mm (1.9 in)
71
Wettest five days (Rx5day)
145.3 mm (5.7 in)
1969
69.9 mm (2.8 in)
71
Longest dry spell (CDD)
46 days
1969
19 days
71
Hottest day (TXx)
The hottest day of the year at Stephenson 5WSW, 1938 to 2008. The record is 38.3 C (100.9 F) in 1955, marked on the chart; the median year is 34.4 C (93.9 F).
Hottest day (TXx) at Stephenson 5WSW by year
Year
Hottest day (TXx)
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
35.6 C (96.1 F)
1949
34.4 C (93.9 F)
1950
32.8 C (91.0 F)
1951
31.1 C (88.0 F)
1952
32.2 C (90.0 F)
1953
34.4 C (93.9 F)
1954
32.8 C (91.0 F)
1955
38.3 C (100.9 F)
1956
35.0 C (95.0 F)
1957
33.3 C (91.9 F)
1958
34.4 C (93.9 F)
1959
33.3 C (91.9 F)
1960
32.2 C (90.0 F)
1961
33.3 C (91.9 F)
1962
32.2 C (90.0 F)
1963
34.4 C (93.9 F)
1964
35.6 C (96.1 F)
1965
35.0 C (95.0 F)
1966
35.0 C (95.0 F)
1967
31.7 C (89.1 F)
1968
34.4 C (93.9 F)
1969
34.4 C (93.9 F)
1970
36.7 C (98.1 F)
1971
35.0 C (95.0 F)
1972
32.2 C (90.0 F)
1973
35.0 C (95.0 F)
1974
33.9 C (93.0 F)
1975
35.6 C (96.1 F)
1976
35.0 C (95.0 F)
1977
36.7 C (98.1 F)
1978
32.2 C (90.0 F)
1979
32.2 C (90.0 F)
1980
33.9 C (93.0 F)
1981
33.9 C (93.0 F)
1982
31.1 C (88.0 F)
1983
32.8 C (91.0 F)
1984
32.8 C (91.0 F)
1985
30.6 C (87.1 F)
1986
34.4 C (93.9 F)
1987
35.6 C (96.1 F)
1988
37.2 C (99.0 F)
1989
34.4 C (93.9 F)
1990
32.2 C (90.0 F)
1991
35.6 C (96.1 F)
1992
33.3 C (91.9 F)
1993
31.7 C (89.1 F)
1994
33.9 C (93.0 F)
1995
36.7 C (98.1 F)
1996
35.0 C (95.0 F)
1997
32.8 C (91.0 F)
1998
33.3 C (91.9 F)
1999
35.0 C (95.0 F)
2000
33.9 C (93.0 F)
2001
37.2 C (99.0 F)
2002
35.0 C (95.0 F)
2003
32.2 C (90.0 F)
2004
31.7 C (89.1 F)
2005
36.7 C (98.1 F)
2006
34.4 C (93.9 F)
2007
36.7 C (98.1 F)
2008
32.8 C (91.0 F)
Coldest night (TNn)
The coldest night of the year at Stephenson 5WSW, 1938 to 2008. The record is -42.8 C (-45.0 F) in 1996, marked on the chart; the median year is -30.0 C (-22.0 F).
Coldest night (TNn) at Stephenson 5WSW by year
Year
Coldest night (TNn)
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
-23.9 C (-11.0 F)
1949
-26.7 C (-16.1 F)
1950
-32.8 C (-27.0 F)
1951
-37.2 C (-35.0 F)
1952
-28.9 C (-20.0 F)
1953
-26.1 C (-15.0 F)
1954
-28.9 C (-20.0 F)
1955
-28.3 C (-18.9 F)
1956
-27.2 C (-17.0 F)
1957
-30.0 C (-22.0 F)
1958
-29.4 C (-20.9 F)
1959
-31.1 C (-24.0 F)
1960
-25.6 C (-14.1 F)
1961
-28.3 C (-18.9 F)
1962
-35.6 C (-32.1 F)
1963
-35.6 C (-32.1 F)
1964
-25.0 C (-13.0 F)
1965
-30.0 C (-22.0 F)
1966
-30.6 C (-23.1 F)
1967
-34.4 C (-29.9 F)
1968
-31.7 C (-25.1 F)
1969
-27.8 C (-18.0 F)
1970
-32.8 C (-27.0 F)
1971
-33.3 C (-27.9 F)
1972
-35.0 C (-31.0 F)
1973
-29.4 C (-20.9 F)
1974
-29.4 C (-20.9 F)
1975
-29.4 C (-20.9 F)
1976
-35.0 C (-31.0 F)
1977
-31.1 C (-24.0 F)
1978
-27.8 C (-18.0 F)
1979
-31.7 C (-25.1 F)
1980
-27.8 C (-18.0 F)
1981
-28.9 C (-20.0 F)
1982
-39.4 C (-38.9 F)
1983
-28.9 C (-20.0 F)
1984
-28.3 C (-18.9 F)
1985
-37.2 C (-35.0 F)
1986
-34.4 C (-29.9 F)
1987
-30.0 C (-22.0 F)
1988
-33.9 C (-29.0 F)
1989
-31.1 C (-24.0 F)
1990
-27.8 C (-18.0 F)
1991
-32.8 C (-27.0 F)
1992
-27.2 C (-17.0 F)
1993
-27.2 C (-17.0 F)
1994
-36.7 C (-34.1 F)
1995
-27.8 C (-18.0 F)
1996
-42.8 C (-45.0 F)
1997
-33.3 C (-27.9 F)
1998
-27.8 C (-18.0 F)
1999
-30.6 C (-23.1 F)
2000
-31.1 C (-24.0 F)
2001
-26.1 C (-15.0 F)
2002
-27.8 C (-18.0 F)
2003
-31.1 C (-24.0 F)
2004
-30.6 C (-23.1 F)
2005
-22.2 C (-8.0 F)
2006
-28.9 C (-20.0 F)
2007
-30.0 C (-22.0 F)
2008
-31.7 C (-25.1 F)
Wettest day (Rx1day)
The wettest day of the year at Stephenson 5WSW, 1938 to 2008. The record is 123.2 mm (4.9 in) in 1941, marked on the chart; the median year is 47.8 mm (1.9 in).
Wettest day (Rx1day) at Stephenson 5WSW by year
Year
Wettest day (Rx1day)
1938
12.2 mm (0.5 in)
1939
43.4 mm (1.7 in)
1940
40.6 mm (1.6 in)
1941
123.2 mm (4.9 in)
1942
90.4 mm (3.6 in)
1943
44.5 mm (1.8 in)
1944
49.0 mm (1.9 in)
1945
72.9 mm (2.9 in)
1946
47.5 mm (1.9 in)
1947
63.5 mm (2.5 in)
1948
49.8 mm (2.0 in)
1949
47.8 mm (1.9 in)
1950
25.9 mm (1.0 in)
1951
44.5 mm (1.8 in)
1952
51.6 mm (2.0 in)
1953
48.3 mm (1.9 in)
1954
50.3 mm (2.0 in)
1955
32.8 mm (1.3 in)
1956
56.9 mm (2.2 in)
1957
37.8 mm (1.5 in)
1958
41.7 mm (1.6 in)
1959
87.6 mm (3.4 in)
1960
56.9 mm (2.2 in)
1961
70.1 mm (2.8 in)
1962
40.9 mm (1.6 in)
1963
50.8 mm (2.0 in)
1964
53.3 mm (2.1 in)
1965
40.6 mm (1.6 in)
1966
42.7 mm (1.7 in)
1967
45.7 mm (1.8 in)
1968
109.7 mm (4.3 in)
1969
95.3 mm (3.8 in)
1970
51.3 mm (2.0 in)
1971
48.3 mm (1.9 in)
1972
27.9 mm (1.1 in)
1973
59.7 mm (2.4 in)
1974
39.4 mm (1.6 in)
1975
35.6 mm (1.4 in)
1976
40.6 mm (1.6 in)
1977
53.3 mm (2.1 in)
1978
36.8 mm (1.4 in)
1979
44.5 mm (1.8 in)
1980
49.5 mm (1.9 in)
1981
49.8 mm (2.0 in)
1982
85.1 mm (3.4 in)
1983
33.5 mm (1.3 in)
1984
33.5 mm (1.3 in)
1985
71.9 mm (2.8 in)
1986
38.1 mm (1.5 in)
1987
35.6 mm (1.4 in)
1988
38.4 mm (1.5 in)
1989
32.0 mm (1.3 in)
1990
76.2 mm (3.0 in)
1991
47.0 mm (1.9 in)
1992
53.3 mm (2.1 in)
1993
58.4 mm (2.3 in)
1994
55.4 mm (2.2 in)
1995
38.1 mm (1.5 in)
1996
42.9 mm (1.7 in)
1997
39.1 mm (1.5 in)
1998
36.1 mm (1.4 in)
1999
37.8 mm (1.5 in)
2000
53.3 mm (2.1 in)
2001
54.1 mm (2.1 in)
2002
74.9 mm (2.9 in)
2003
61.0 mm (2.4 in)
2004
50.8 mm (2.0 in)
2005
50.0 mm (2.0 in)
2006
43.2 mm (1.7 in)
2007
29.2 mm (1.1 in)
2008
22.9 mm (0.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Stephenson 5WSW, 1938 to 2008. The record is 145.3 mm (5.7 in) in 1969, marked on the chart; the median year is 69.9 mm (2.8 in).
Wettest five days (Rx5day) at Stephenson 5WSW by year
Year
Wettest five days (Rx5day)
1938
33.6 mm (1.3 in)
1939
82.9 mm (3.3 in)
1940
58.5 mm (2.3 in)
1941
19.8 mm (0.8 in)
1942
88.1 mm (3.5 in)
1943
64.1 mm (2.5 in)
1944
63.2 mm (2.5 in)
1945
81.3 mm (3.2 in)
1946
65.3 mm (2.6 in)
1947
109.3 mm (4.3 in)
1948
52.8 mm (2.1 in)
1949
68.6 mm (2.7 in)
1950
49.8 mm (2.0 in)
1951
65.8 mm (2.6 in)
1952
78.8 mm (3.1 in)
1953
60.3 mm (2.4 in)
1954
74.9 mm (2.9 in)
1955
53.1 mm (2.1 in)
1956
85.6 mm (3.4 in)
1957
46.4 mm (1.8 in)
1958
91.3 mm (3.6 in)
1959
106.7 mm (4.2 in)
1960
113.6 mm (4.5 in)
1961
76.4 mm (3.0 in)
1962
77.2 mm (3.0 in)
1963
83.6 mm (3.3 in)
1964
78.7 mm (3.1 in)
1965
87.8 mm (3.5 in)
1966
83.3 mm (3.3 in)
1967
76.2 mm (3.0 in)
1968
132.6 mm (5.2 in)
1969
145.3 mm (5.7 in)
1970
71.3 mm (2.8 in)
1971
69.9 mm (2.8 in)
1972
51.3 mm (2.0 in)
1973
73.7 mm (2.9 in)
1974
61.4 mm (2.4 in)
1975
51.6 mm (2.0 in)
1976
51.5 mm (2.0 in)
1977
78.4 mm (3.1 in)
1978
74.4 mm (2.9 in)
1979
54.7 mm (2.2 in)
1980
75.9 mm (3.0 in)
1981
77.2 mm (3.0 in)
1982
88.4 mm (3.5 in)
1983
70.3 mm (2.8 in)
1984
54.6 mm (2.1 in)
1985
89.7 mm (3.5 in)
1986
62.8 mm (2.5 in)
1987
53.7 mm (2.1 in)
1988
51.1 mm (2.0 in)
1989
58.0 mm (2.3 in)
1990
129.8 mm (5.1 in)
1991
72.3 mm (2.8 in)
1992
66.5 mm (2.6 in)
1993
112.6 mm (4.4 in)
1994
120.4 mm (4.7 in)
1995
64.3 mm (2.5 in)
1996
68.6 mm (2.7 in)
1997
59.1 mm (2.3 in)
1998
54.7 mm (2.2 in)
1999
62.7 mm (2.5 in)
2000
82.3 mm (3.2 in)
2001
57.9 mm (2.3 in)
2002
86.4 mm (3.4 in)
2003
92.2 mm (3.6 in)
2004
55.6 mm (2.2 in)
2005
69.3 mm (2.7 in)
2006
65.3 mm (2.6 in)
2007
64.2 mm (2.5 in)
2008
32.5 mm (1.3 in)
Longest dry spell (CDD)
The longest dry spell of the year at Stephenson 5WSW, 1938 to 2008. The record is 46 days in 1969, marked on the chart; the median year is 19 days.
Longest dry spell (CDD) at Stephenson 5WSW by year
Year
Longest dry spell (CDD)
1938
10 days
1939
20 days
1940
12 days
1941
4 days
1942
2 days
1943
30 days
1944
26 days
1945
11 days
1946
20 days
1947
19 days
1948
18 days
1949
19 days
1950
14 days
1951
17 days
1952
23 days
1953
35 days
1954
21 days
1955
14 days
1956
23 days
1957
18 days
1958
15 days
1959
19 days
1960
20 days
1961
21 days
1962
18 days
1963
16 days
1964
26 days
1965
18 days
1966
17 days
1967
20 days
1968
20 days
1969
46 days
1970
26 days
1971
29 days
1972
14 days
1973
17 days
1974
14 days
1975
20 days
1976
15 days
1977
13 days
1978
16 days
1979
15 days
1980
28 days
1981
15 days
1982
23 days
1983
13 days
1984
16 days
1985
18 days
1986
22 days
1987
23 days
1988
28 days
1989
23 days
1990
15 days
1991
35 days
1992
27 days
1993
25 days
1994
21 days
1995
22 days
1996
20 days
1997
18 days
1998
17 days
1999
24 days
2000
17 days
2001
30 days
2002
17 days
2003
17 days
2004
11 days
2005
29 days
2006
25 days
2007
26 days
2008
23 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
52 years with a frost
Across 52 years with a frost, the median last spring frost at Stephenson 5WSW falls on 2 June and the median first autumn frost on 18 September, which leaves a median of 110 days between them.
Fitted over all years, the growing season changes by +1.5 days per decade at this station.
Frost dates and growing season at Stephenson 5WSW
Measure
Median, all years
Earliest period
Recent period (1971 to 2004)
Recent against earliest
Fitted trend
Last spring frost
2 June
n/a
2 June
n/a
0.0 days per decade
First autumn frost
18 September
n/a
19 September
n/a
+1.6 days per decade
Growing days
110 days
n/a
110 days
n/a
+1.5 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
58 years, 1939 to 2004
A day with at least 47.4 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 107.1 mm (4.2 in) of rain is expected about once in 100 years.
Rainfall return levels at Stephenson 5WSW: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
47.4 mm (1.9 in)
5 years
60.7 mm (2.4 in)
10 years
70.5 mm (2.8 in)
25 years
84.1 mm (3.3 in)
50 years
95.2 mm (3.7 in)
100 years
107.1 mm (4.2 in)
Longer than the 58 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, 58 years of values from 1939 to 2004.
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: 109.7 mm (4.3 in) in 1968; 95.3 mm (3.8 in) in 1969; 87.6 mm (3.4 in) in 1959.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Stephenson 5WSW, at 1956. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1956 ran 0.3 C (0.5 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Stephenson 5WSW, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1956
-0.3
-0.5
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 Stephenson 5WSW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Stephenson 5WSW 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.