Record envelope, standing records and threshold days for Roscoe (USC00397277), South Dakota, United States, with 93 years of record.
Key Facts for Roscoe
Roscoe (USC00397277) is a weather station in South Dakota, United States at 45.45 latitude and -99.34 longitude, 559 m (1,833 ft) above sea level.
The station reports from 1934 to 2026, 93 years of record.
1,464 records set at Roscoe still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Roscoe set a daily record snowfall of 11.9 cm (4.7 in) on 2 April 2026.
About the Station
Location: South Dakota, United States, 45.45 latitude, -99.34 longitude.
Elevation: 559 m (1,833 ft).
Period of record: 1934 to 2026, 93 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 Roscoe. 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 Roscoe, 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)
-38.3 C (-36.9 F)
n/a
n/a
Feb
20.6 C (69.1 F)
-36.7 C (-34.1 F)
n/a
n/a
Mar
28.3 C (82.9 F)
-31.1 C (-24.0 F)
n/a
n/a
Apr
34.4 C (93.9 F)
-17.2 C (1.0 F)
n/a
n/a
May
38.9 C (102.0 F)
-8.3 C (17.1 F)
n/a
n/a
Jun
41.7 C (107.1 F)
-1.7 C (28.9 F)
n/a
n/a
Jul
44.4 C (111.9 F)
3.3 C (37.9 F)
n/a
n/a
Aug
42.2 C (108.0 F)
2.2 C (36.0 F)
n/a
n/a
Sep
38.9 C (102.0 F)
-6.1 C (21.0 F)
n/a
n/a
Oct
33.9 C (93.0 F)
-18.9 C (-2.0 F)
n/a
n/a
Nov
25.6 C (78.1 F)
-28.3 C (-18.9 F)
n/a
n/a
Dec
17.8 C (64.0 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 Roscoe still stand. 1992 holds the most, with 49.
Standing records at Roscoe by the year they were set
Year set
Standing records
1935
3
1948
9
1949
27
1950
32
1951
31
1952
29
1953
31
1954
28
1955
44
1956
21
1957
18
1958
35
1959
39
1960
17
1961
23
1962
23
1963
20
1964
28
1965
32
1966
25
1967
16
1968
17
1969
25
1970
16
1971
40
1972
13
1973
13
1989
19
1990
25
1991
43
1992
49
1993
22
1994
22
1995
17
1996
42
1997
20
1998
21
1999
20
2000
36
2001
16
2002
25
2003
17
2004
22
2005
20
2006
30
2007
23
2008
12
2009
13
2010
19
2011
18
2012
37
2013
18
2014
15
2015
26
2016
16
2017
18
2018
25
2019
29
2020
21
2021
33
2022
14
2023
6
All-Time Record Progression
4 new records
4 all-time records were set at Roscoe between 5 January 1997 and 8 July 2022. Each dot is a new record.
When Roscoe set new all-time records
Date
Kind
Detail
1997-01-05
Record snow depth
Record snow depth 94.0 cm (37.0 in)
2006-07-16
Record high maximum temperature
Record high maximum temperature 44.4 C (111.9 F)
2011-07-20
Record high minimum temperature
Record high minimum temperature 24.4 C (75.9 F)
2022-07-08
Record daily precipitation
Record daily precipitation 109.2 mm (4.3 in)
Wettest Day of Each Month
Jul: 109.2 mm (4.3 in)
The wettest day on record for each calendar month at Roscoe. The most was 109.2 mm (4.3 in) on 8 July 2022.
Record daily precipitation for each month at Roscoe
Month
Record daily precipitation (mm)
Date
Jan
32.8 mm (1.3 in)
27 January 1944
Feb
27.7 mm (1.1 in)
27 February 1969
Mar
51.6 mm (2.0 in)
3 March 1966
Apr
46.0 mm (1.8 in)
19 April 1957
May
74.4 mm (2.9 in)
9 May 1995
Jun
108.7 mm (4.3 in)
18 June 1964
Jul
109.2 mm (4.3 in)
8 July 2022
Aug
97.3 mm (3.8 in)
5 August 2000
Sep
65.5 mm (2.6 in)
20 September 1996
Oct
74.7 mm (2.9 in)
17 October 1998
Nov
38.1 mm (1.5 in)
26 November 1944
Dec
29.7 mm (1.2 in)
26 December 2016
Period of Record Coverage
1935 to 2023
Complete yearUnder 90 percent of days
62 years of record at Roscoe, 1935 to 2023. 6 years have data for under 90 percent of days and are left out of rankings: 1935, 1948, 1972, 1973, 1989, 2023.
Cooler than the station meanWarmer than the station mean
One stripe for each of 53 complete years at Roscoe, 1949 to 2022. Blue stripes are years cooler than the station's own mean of 6.0 C (42.7 F); red stripes are warmer. The coolest year was 1996, at 3.4 C (38.1 F), and the warmest was 2012, at 8.0 C (46.4 F). The strongest colour marks a difference of 2.6 C (4.7 F).
Annual mean temperature at Roscoe as warming stripes, 1949 to 2022
Year
Annual mean temperature
Difference from the station mean
1949
6.4 C
+0.47 C
1950
4.0 C
-1.96 C
1951
4.2 C
-1.81 C
1952
6.6 C
+0.64 C
1953
7.3 C
+1.29 C
1954
7.3 C
+1.31 C
1955
6.3 C
+0.31 C
1956
6.1 C
+0.11 C
1957
6.3 C
+0.33 C
1958
6.5 C
+0.48 C
1959
6.1 C
+0.13 C
1960
5.3 C
-0.63 C
1961
6.4 C
+0.38 C
1962
5.9 C
-0.07 C
1963
6.7 C
+0.75 C
1964
6.5 C
+0.55 C
1967
6.0 C
+0.01 C
1968
6.0 C
+0.04 C
1969
5.4 C
-0.61 C
1970
5.5 C
-0.44 C
1971
5.7 C
-0.23 C
1990
6.6 C
+0.65 C
1991
6.5 C
+0.53 C
1992
5.8 C
-0.14 C
1993
4.0 C
-1.98 C
1994
4.9 C
-1.05 C
1995
5.2 C
-0.80 C
1996
3.4 C
-2.60 C
1997
5.4 C
-0.60 C
1998
7.3 C
+1.32 C
1999
7.2 C
+1.19 C
2000
6.1 C
+0.15 C
2001
6.4 C
+0.41 C
2002
6.4 C
+0.38 C
2003
6.0 C
+0.02 C
2005
6.9 C
+0.97 C
2006
7.7 C
+1.72 C
2007
6.2 C
+0.20 C
2008
4.9 C
-1.06 C
2009
4.7 C
-1.24 C
2010
6.0 C
+0.04 C
2011
5.6 C
-0.42 C
2012
8.0 C
+2.01 C
2013
4.8 C
-1.16 C
2014
4.9 C
-1.03 C
2015
7.4 C
+1.40 C
2016
7.6 C
+1.62 C
2017
6.4 C
+0.43 C
2018
5.1 C
-0.83 C
2019
3.8 C
-2.18 C
2020
6.3 C
+0.33 C
2021
7.4 C
+1.47 C
2022
5.1 C
-0.90 C
The fitted trend in annual mean temperature here over 1949 to 2022 is -0.01 C (-0.13 to 0.11) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.01 F (-0.23 to 0.21) per decade. The slope is a straight line fitted to 53 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Roscoe
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.01 C (-0.13 to 0.11) per decade
-0.01 F (-0.23 to 0.21) per decade
1949 to 2022
53
Not clearly different from zero
Mean daily maximum
-0.15 C (-0.30 to 0.00) per decade
-0.27 F (-0.54 to 0.00) per decade
1949 to 2022
53
Not clearly different from zero
Mean daily minimum
0.14 C (0.03 to 0.24) per decade
0.2 F (0.1 to 0.4) per decade
1949 to 2022
53
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
1934 to 2026
Yearly extremes at Roscoe: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
44.4 C (111.9 F)
2006
37.8 C (100.0 F)
62
Coldest night (TNn)
-38.3 C (-36.9 F)
1972
-31.6 C (-25.0 F)
62
Wettest day (Rx1day)
109.2 mm (4.3 in)
2022
43.7 mm (1.7 in)
78
Wettest five days (Rx5day)
187.6 mm (7.4 in)
2022
72.3 mm (2.8 in)
78
Longest dry spell (CDD)
84 days
1945
34 days
78
Hottest day (TXx)
The hottest day of the year at Roscoe, 1934 to 2026. The record is 44.4 C (111.9 F) in 2006, marked on the chart; the median year is 37.8 C (100.0 F).
Hottest day (TXx) at Roscoe by year
Year
Hottest day (TXx)
1934
n/a
1935
17.2 C (63.0 F)
1936
n/a
1937
n/a
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
38.9 C (102.0 F)
1949
42.8 C (109.0 F)
1950
38.9 C (102.0 F)
1951
37.8 C (100.0 F)
1952
40.6 C (105.1 F)
1953
37.2 C (99.0 F)
1954
40.6 C (105.1 F)
1955
40.0 C (104.0 F)
1956
40.6 C (105.1 F)
1957
37.8 C (100.0 F)
1958
40.0 C (104.0 F)
1959
42.2 C (108.0 F)
1960
38.9 C (102.0 F)
1961
39.4 C (102.9 F)
1962
37.8 C (100.0 F)
1963
39.4 C (102.9 F)
1964
37.2 C (99.0 F)
1965
41.1 C (106.0 F)
1966
41.1 C (106.0 F)
1967
37.8 C (100.0 F)
1968
36.7 C (98.1 F)
1969
38.9 C (102.0 F)
1970
38.9 C (102.0 F)
1971
40.6 C (105.1 F)
1972
35.0 C (95.0 F)
1973
42.8 C (109.0 F)
1989
37.8 C (100.0 F)
1990
33.9 C (93.0 F)
1991
38.3 C (100.9 F)
1992
36.7 C (98.1 F)
1993
33.3 C (91.9 F)
1994
33.9 C (93.0 F)
1995
36.1 C (97.0 F)
1996
35.6 C (96.1 F)
1997
35.6 C (96.1 F)
1998
37.2 C (99.0 F)
1999
37.8 C (100.0 F)
2000
36.1 C (97.0 F)
2001
38.3 C (100.9 F)
2002
41.7 C (107.1 F)
2003
41.1 C (106.0 F)
2004
35.0 C (95.0 F)
2005
38.9 C (102.0 F)
2006
44.4 C (111.9 F)
2007
40.6 C (105.1 F)
2008
34.4 C (93.9 F)
2009
34.4 C (93.9 F)
2010
38.9 C (102.0 F)
2011
37.8 C (100.0 F)
2012
37.8 C (100.0 F)
2013
37.2 C (99.0 F)
2014
36.1 C (97.0 F)
2015
35.6 C (96.1 F)
2016
35.6 C (96.1 F)
2017
38.3 C (100.9 F)
2018
37.2 C (99.0 F)
2019
35.0 C (95.0 F)
2020
35.0 C (95.0 F)
2021
38.3 C (100.9 F)
2022
37.2 C (99.0 F)
2023
37.2 C (99.0 F)
2024
n/a
2025
n/a
2026
n/a
Coldest night (TNn)
The coldest night of the year at Roscoe, 1934 to 2026. The record is -38.3 C (-36.9 F) in 1972, marked on the chart; the median year is -31.6 C (-25.0 F).
Coldest night (TNn) at Roscoe by year
Year
Coldest night (TNn)
1934
n/a
1935
-33.3 C (-27.9 F)
1936
n/a
1937
n/a
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
-23.3 C (-9.9 F)
1949
-35.6 C (-32.1 F)
1950
-35.6 C (-32.1 F)
1951
-35.6 C (-32.1 F)
1952
-28.3 C (-18.9 F)
1953
-26.7 C (-16.1 F)
1954
-35.0 C (-31.0 F)
1955
-32.2 C (-26.0 F)
1956
-30.6 C (-23.1 F)
1957
-32.8 C (-27.0 F)
1958
-32.2 C (-26.0 F)
1959
-32.2 C (-26.0 F)
1960
-33.9 C (-29.0 F)
1961
-35.6 C (-32.1 F)
1962
-33.3 C (-27.9 F)
1963
-36.1 C (-33.0 F)
1964
-29.4 C (-20.9 F)
1965
-32.8 C (-27.0 F)
1966
-36.1 C (-33.0 F)
1967
-37.2 C (-35.0 F)
1968
-36.7 C (-34.1 F)
1969
-28.3 C (-18.9 F)
1970
-33.3 C (-27.9 F)
1971
-34.4 C (-29.9 F)
1972
-38.3 C (-36.9 F)
1973
-31.1 C (-24.0 F)
1989
-35.6 C (-32.1 F)
1990
-35.6 C (-32.1 F)
1991
-27.8 C (-18.0 F)
1992
-27.2 C (-17.0 F)
1993
-30.0 C (-22.0 F)
1994
-36.7 C (-34.1 F)
1995
-27.8 C (-18.0 F)
1996
-35.0 C (-31.0 F)
1997
-31.1 C (-24.0 F)
1998
-30.0 C (-22.0 F)
1999
-30.6 C (-23.1 F)
2000
-30.0 C (-22.0 F)
2001
-27.2 C (-17.0 F)
2002
-25.0 C (-13.0 F)
2003
-29.4 C (-20.9 F)
2004
-30.0 C (-22.0 F)
2005
-33.9 C (-29.0 F)
2006
-27.2 C (-17.0 F)
2007
-30.6 C (-23.1 F)
2008
-31.1 C (-24.0 F)
2009
-35.6 C (-32.1 F)
2010
-32.2 C (-26.0 F)
2011
-30.0 C (-22.0 F)
2012
-23.3 C (-9.9 F)
2013
-29.4 C (-20.9 F)
2014
-28.9 C (-20.0 F)
2015
-27.8 C (-18.0 F)
2016
-30.6 C (-23.1 F)
2017
-33.9 C (-29.0 F)
2018
-34.4 C (-29.9 F)
2019
-33.9 C (-29.0 F)
2020
-28.3 C (-18.9 F)
2021
-33.9 C (-29.0 F)
2022
-30.6 C (-23.1 F)
2023
-28.9 C (-20.0 F)
2024
n/a
2025
n/a
2026
n/a
Wettest day (Rx1day)
The wettest day of the year at Roscoe, 1934 to 2026. The record is 109.2 mm (4.3 in) in 2022, marked on the chart; the median year is 43.7 mm (1.7 in).
Wettest day (Rx1day) at Roscoe by year
Year
Wettest day (Rx1day)
1934
0.8 mm (0.03 in)
1935
55.9 mm (2.2 in)
1936
23.6 mm (0.9 in)
1937
51.3 mm (2.0 in)
1938
44.2 mm (1.7 in)
1939
36.1 mm (1.4 in)
1940
34.3 mm (1.4 in)
1941
53.3 mm (2.1 in)
1942
41.9 mm (1.6 in)
1943
34.3 mm (1.4 in)
1944
39.9 mm (1.6 in)
1945
42.2 mm (1.7 in)
1946
53.3 mm (2.1 in)
1947
87.6 mm (3.4 in)
1948
48.0 mm (1.9 in)
1949
37.1 mm (1.5 in)
1950
42.7 mm (1.7 in)
1951
59.4 mm (2.3 in)
1952
24.9 mm (1.0 in)
1953
34.3 mm (1.4 in)
1954
56.4 mm (2.2 in)
1955
30.0 mm (1.2 in)
1956
29.5 mm (1.2 in)
1957
46.0 mm (1.8 in)
1958
25.4 mm (1.0 in)
1959
25.7 mm (1.0 in)
1960
74.9 mm (2.9 in)
1961
40.6 mm (1.6 in)
1962
35.6 mm (1.4 in)
1963
43.2 mm (1.7 in)
1964
108.7 mm (4.3 in)
1965
37.6 mm (1.5 in)
1966
59.7 mm (2.4 in)
1967
47.5 mm (1.9 in)
1968
41.7 mm (1.6 in)
1969
94.0 mm (3.7 in)
1970
32.5 mm (1.3 in)
1971
38.9 mm (1.5 in)
1972
30.7 mm (1.2 in)
1973
40.1 mm (1.6 in)
1989
63.5 mm (2.5 in)
1990
66.0 mm (2.6 in)
1991
50.8 mm (2.0 in)
1992
45.2 mm (1.8 in)
1993
78.7 mm (3.1 in)
1994
53.8 mm (2.1 in)
1995
74.4 mm (2.9 in)
1996
65.5 mm (2.6 in)
1997
45.2 mm (1.8 in)
1998
74.7 mm (2.9 in)
1999
60.7 mm (2.4 in)
2000
97.3 mm (3.8 in)
2001
42.7 mm (1.7 in)
2002
24.9 mm (1.0 in)
2003
70.6 mm (2.8 in)
2004
45.5 mm (1.8 in)
2005
45.7 mm (1.8 in)
2006
20.1 mm (0.8 in)
2007
37.1 mm (1.5 in)
2008
55.9 mm (2.2 in)
2009
58.7 mm (2.3 in)
2010
35.8 mm (1.4 in)
2011
47.5 mm (1.9 in)
2012
23.6 mm (0.9 in)
2013
61.2 mm (2.4 in)
2014
41.7 mm (1.6 in)
2015
73.7 mm (2.9 in)
2016
50.8 mm (2.0 in)
2017
29.7 mm (1.2 in)
2018
41.4 mm (1.6 in)
2019
36.8 mm (1.4 in)
2020
34.5 mm (1.4 in)
2021
39.6 mm (1.6 in)
2022
109.2 mm (4.3 in)
2023
50.0 mm (2.0 in)
2024
18.5 mm (0.7 in)
2025
53.3 mm (2.1 in)
2026
25.7 mm (1.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Roscoe, 1934 to 2026. The record is 187.6 mm (7.4 in) in 2022, marked on the chart; the median year is 72.3 mm (2.8 in).
Wettest five days (Rx5day) at Roscoe by year
Year
Wettest five days (Rx5day)
1934
1.9 mm (0.07 in)
1935
68.8 mm (2.7 in)
1936
31.3 mm (1.2 in)
1937
91.2 mm (3.6 in)
1938
63.1 mm (2.5 in)
1939
40.6 mm (1.6 in)
1940
45.7 mm (1.8 in)
1941
80.0 mm (3.1 in)
1942
82.1 mm (3.2 in)
1943
72.9 mm (2.9 in)
1944
67.3 mm (2.6 in)
1945
57.9 mm (2.3 in)
1946
64.0 mm (2.5 in)
1947
96.0 mm (3.8 in)
1948
84.3 mm (3.3 in)
1949
49.0 mm (1.9 in)
1950
73.0 mm (2.9 in)
1951
70.1 mm (2.8 in)
1952
39.9 mm (1.6 in)
1953
56.3 mm (2.2 in)
1954
93.2 mm (3.7 in)
1955
35.9 mm (1.4 in)
1956
59.2 mm (2.3 in)
1957
74.5 mm (2.9 in)
1958
44.4 mm (1.7 in)
1959
53.3 mm (2.1 in)
1960
97.2 mm (3.8 in)
1961
74.6 mm (2.9 in)
1962
56.5 mm (2.2 in)
1963
71.7 mm (2.8 in)
1964
159.5 mm (6.3 in)
1965
52.4 mm (2.1 in)
1966
84.4 mm (3.3 in)
1967
90.9 mm (3.6 in)
1968
89.3 mm (3.5 in)
1969
98.4 mm (3.9 in)
1970
62.7 mm (2.5 in)
1971
60.5 mm (2.4 in)
1972
33.2 mm (1.3 in)
1973
40.1 mm (1.6 in)
1989
63.8 mm (2.5 in)
1990
84.7 mm (3.3 in)
1991
68.8 mm (2.7 in)
1992
86.4 mm (3.4 in)
1993
88.1 mm (3.5 in)
1994
99.5 mm (3.9 in)
1995
92.2 mm (3.6 in)
1996
98.5 mm (3.9 in)
1997
51.1 mm (2.0 in)
1998
82.9 mm (3.3 in)
1999
97.5 mm (3.8 in)
2000
101.1 mm (4.0 in)
2001
62.3 mm (2.5 in)
2002
39.0 mm (1.5 in)
2003
109.5 mm (4.3 in)
2004
61.7 mm (2.4 in)
2005
78.5 mm (3.1 in)
2006
33.5 mm (1.3 in)
2007
81.0 mm (3.2 in)
2008
112.0 mm (4.4 in)
2009
84.4 mm (3.3 in)
2010
55.6 mm (2.2 in)
2011
82.5 mm (3.2 in)
2012
46.4 mm (1.8 in)
2013
111.2 mm (4.4 in)
2014
76.5 mm (3.0 in)
2015
90.2 mm (3.6 in)
2016
56.7 mm (2.2 in)
2017
97.8 mm (3.9 in)
2018
58.9 mm (2.3 in)
2019
71.4 mm (2.8 in)
2020
34.5 mm (1.4 in)
2021
92.7 mm (3.6 in)
2022
187.6 mm (7.4 in)
2023
93.9 mm (3.7 in)
2024
19.8 mm (0.8 in)
2025
86.4 mm (3.4 in)
2026
34.3 mm (1.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Roscoe, 1934 to 2026. The record is 84 days in 1945, marked on the chart; the median year is 34 days.
Longest dry spell (CDD) at Roscoe by year
Year
Longest dry spell (CDD)
1934
31 days
1935
36 days
1936
43 days
1937
35 days
1938
23 days
1939
67 days
1940
40 days
1941
51 days
1942
37 days
1943
39 days
1944
35 days
1945
84 days
1946
34 days
1947
51 days
1948
28 days
1949
29 days
1950
45 days
1951
33 days
1952
64 days
1953
21 days
1954
30 days
1955
32 days
1956
41 days
1957
37 days
1958
33 days
1959
42 days
1960
31 days
1961
52 days
1962
22 days
1963
32 days
1964
58 days
1965
23 days
1966
35 days
1967
48 days
1968
66 days
1969
32 days
1970
30 days
1971
43 days
1972
30 days
1973
42 days
1989
34 days
1990
26 days
1991
48 days
1992
38 days
1993
25 days
1994
24 days
1995
27 days
1996
28 days
1997
21 days
1998
35 days
1999
59 days
2000
22 days
2001
31 days
2002
49 days
2003
34 days
2004
35 days
2005
29 days
2006
79 days
2007
42 days
2008
34 days
2009
25 days
2010
29 days
2011
55 days
2012
65 days
2013
33 days
2014
26 days
2015
29 days
2016
27 days
2017
35 days
2018
23 days
2019
18 days
2020
58 days
2021
63 days
2022
46 days
2023
20 days
2024
44 days
2025
33 days
2026
20 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
53 years with a frost
Across 53 years with a frost, the median last spring frost at Roscoe falls on 11 May and the median first autumn frost on 28 September, which leaves a median of 142 days between them.
Fitted over all years, the growing season changes by +2.6 days per decade at this station.
Frost dates and growing season at Roscoe
Measure
Median, all years
Earliest period
Recent period (1992 to 2022)
Recent against earliest
Fitted trend
Last spring frost
11 May
n/a
11 May
n/a
-0.8 days per decade
First autumn frost
28 September
n/a
2 October
n/a
+1.7 days per decade
Growing days
142 days
n/a
147 days
n/a
+2.6 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, 1935 to 2025
A day with at least 44.7 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 119.1 mm (4.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Roscoe: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
44.7 mm (1.8 in)
5 years
62.2 mm (2.4 in)
10 years
74.7 mm (2.9 in)
25 years
91.6 mm (3.6 in)
50 years
105.0 mm (4.1 in)
100 years
119.1 mm (4.7 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 1935 to 2025.
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: 109.2 mm (4.3 in) in 2022; 108.7 mm (4.3 in) in 1964; 97.3 mm (3.8 in) in 2000.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Roscoe standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Roscoe 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.