Record envelope, standing records and threshold days for Afton (USC00480027), Wyoming, United States, with 70 years of record.
Key Facts for Afton
Afton (USC00480027) is a weather station in Wyoming, United States at 42.73 latitude and -110.92 longitude, 1,904 m (6,248 ft) above sea level.
The station reports from 1957 to 2026, 70 years of record.
1,464 records set at Afton still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Afton set a daily record low maximum temperature of 5.6 C (42.1 F) on 19 May 2026.
About the Station
Location: Wyoming, United States, 42.73 latitude, -110.92 longitude.
Elevation: 1,904 m (6,248 ft).
Period of record: 1957 to 2026, 70 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
16 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 Afton. The lines show the 2026 daily maximum and minimum. 16 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Afton, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
12.2 C (54.0 F)
-43.3 C (-45.9 F)
5.6 C (42.1 F)
-22.8 C (-9.0 F)
Feb
13.3 C (55.9 F)
-40.0 C (-40.0 F)
10.6 C (51.1 F)
-20.0 C (-4.0 F)
Mar
22.8 C (73.0 F)
-30.0 C (-22.0 F)
22.8 C (73.0 F)
-14.4 C (6.1 F)
Apr
25.6 C (78.1 F)
-19.4 C (-2.9 F)
22.2 C (72.0 F)
-8.9 C (16.0 F)
May
30.6 C (87.1 F)
-12.8 C (9.0 F)
26.7 C (80.1 F)
-4.4 C (24.1 F)
Jun
34.4 C (93.9 F)
-7.2 C (19.0 F)
n/a
n/a
Jul
36.1 C (97.0 F)
-3.3 C (26.1 F)
n/a
n/a
Aug
35.6 C (96.1 F)
-6.1 C (21.0 F)
n/a
n/a
Sep
33.9 C (93.0 F)
-11.7 C (10.9 F)
n/a
n/a
Oct
28.3 C (82.9 F)
-21.7 C (-7.1 F)
n/a
n/a
Nov
21.1 C (70.0 F)
-30.0 C (-22.0 F)
n/a
n/a
Dec
14.4 C (57.9 F)
-38.9 C (-38.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Afton still stand. 1962 holds the most, with 51.
Standing records at Afton by the year they were set
Year set
Standing records
1957
17
1958
15
1959
24
1960
26
1961
23
1962
51
1963
22
1964
20
1965
25
1966
20
1967
24
1968
19
1969
28
1970
18
1971
28
1972
24
1973
16
1974
41
1975
26
1976
42
1977
14
1978
11
1979
22
1980
15
1981
11
1982
38
1983
27
1984
16
1985
22
1986
18
1987
29
1988
33
1989
26
1990
42
1991
14
1992
26
1993
22
1994
19
1995
22
1996
31
1997
16
1998
3
1999
10
2000
13
2001
22
2002
16
2003
26
2004
14
2005
10
2006
4
2007
25
2008
13
2009
21
2010
3
2011
3
2012
16
2013
25
2014
24
2015
28
2016
15
2017
17
2018
10
2019
22
2020
26
2021
13
2022
27
2023
20
2024
7
2025
29
2026
19
All-Time Record Progression
8 new records
8 all-time records were set at Afton between 2 December 1991 and 4 April 2023. Each dot is a new record.
When Afton set new all-time records
Date
Kind
Detail
1991-12-02
Record daily snowfall
Record daily snowfall 35.6 cm (14.0 in)
2000-08-01
Record high maximum temperature
Record high maximum temperature 35.6 C (96.1 F)
2002-07-15
Record high maximum temperature
Record high maximum temperature 36.1 C (97.0 F)
2005-07-22
Record high minimum temperature
Record high minimum temperature 16.1 C (61.0 F)
2007-12-20
Record daily precipitation
Record daily precipitation 51.8 mm (2.0 in)
2008-08-09
Record daily precipitation
Record daily precipitation 52.3 mm (2.1 in)
2023-02-28
Record snow depth
Record snow depth 104.1 cm (41.0 in)
2023-04-04
Record snow depth
Record snow depth 121.9 cm (48.0 in)
Wettest Day of Each Month
Aug: 52.3 mm (2.1 in)
The wettest day on record for each calendar month at Afton. The most was 52.3 mm (2.1 in) on 9 August 2008.
Record daily precipitation for each month at Afton
Month
Record daily precipitation (mm)
Date
Jan
21.3 mm (0.8 in)
14 January 1980
Feb
24.1 mm (0.9 in)
8 February 1960
Mar
27.9 mm (1.1 in)
18 March 1984
Apr
29.5 mm (1.2 in)
8 April 2017
May
40.6 mm (1.6 in)
10 May 1966
Jun
43.4 mm (1.7 in)
7 June 1964
Jul
35.6 mm (1.4 in)
14 July 2012
Aug
52.3 mm (2.1 in)
9 August 2008
Sep
38.4 mm (1.5 in)
23 September 1984
Oct
31.5 mm (1.2 in)
9 October 2021
Nov
31.8 mm (1.3 in)
17 November 2025
Dec
51.8 mm (2.0 in)
20 December 2007
Period of Record Coverage
1957 to 2026
Complete yearUnder 90 percent of days
70 years of record at Afton, 1957 to 2026. 23 years have data for under 90 percent of days and are left out of rankings: 1957, 1973, 1977, 1978, 1979, 1984, 1985, 1989 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 47 complete years at Afton, 1958 to 2025. Blue stripes are years cooler than the station's own mean of 4.0 C (39.3 F); red stripes are warmer. The coolest year was 1993, at 2.5 C (36.5 F), and the warmest was 1995, at 5.4 C (41.7 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at Afton as warming stripes, 1958 to 2025
Year
Annual mean temperature
Difference from the station mean
1958
4.1 C
+0.03 C
1959
4.0 C
-0.08 C
1960
3.2 C
-0.82 C
1961
3.0 C
-1.08 C
1962
3.3 C
-0.69 C
1963
4.6 C
+0.61 C
1964
3.2 C
-0.79 C
1965
3.5 C
-0.53 C
1966
4.2 C
+0.13 C
1967
4.6 C
+0.54 C
1968
3.4 C
-0.61 C
1970
3.7 C
-0.30 C
1971
3.8 C
-0.23 C
1972
4.0 C
+0.01 C
1974
4.0 C
-0.02 C
1975
3.1 C
-0.90 C
1976
3.6 C
-0.42 C
1980
3.9 C
-0.10 C
1981
4.0 C
-0.04 C
1982
2.7 C
-1.30 C
1985
2.9 C
-1.09 C
1986
4.5 C
+0.44 C
1987
4.4 C
+0.33 C
1988
4.7 C
+0.62 C
1990
4.8 C
+0.80 C
1991
4.1 C
+0.05 C
1992
5.0 C
+0.99 C
1993
2.5 C
-1.52 C
1994
4.5 C
+0.50 C
1995
5.4 C
+1.35 C
1996
5.3 C
+1.22 C
2000
4.2 C
+0.16 C
2002
3.7 C
-0.31 C
2012
4.8 C
+0.77 C
2013
3.5 C
-0.52 C
2014
4.6 C
+0.61 C
2015
5.2 C
+1.18 C
2016
5.1 C
+1.04 C
2017
4.8 C
+0.74 C
2018
4.3 C
+0.31 C
2019
3.1 C
-0.96 C
2020
3.6 C
-0.46 C
2021
4.6 C
+0.59 C
2022
2.7 C
-1.36 C
2023
3.4 C
-0.64 C
2024
4.8 C
+0.75 C
2025
5.1 C
+1.04 C
The annual mean temperature here has risen by 0.10 C (0.00 to 0.20) per decade over 1958 to 2025. In Fahrenheit: 0.18 F (0.01 to 0.36) per decade. The slope is a straight line fitted to 47 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Afton
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.10 C (0.00 to 0.20) per decade
0.18 F (0.01 to 0.36) per decade
1958 to 2025
47
Rise
Mean daily maximum
-0.1 C (-0.2 to 0.1) per decade
-0.1 F (-0.3 to 0.1) per decade
1958 to 2025
47
Not clearly different from zero
Mean daily minimum
0.3 C (0.2 to 0.4) per decade
0.5 F (0.3 to 0.7) per decade
1958 to 2025
47
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
1957 to 2026
Yearly extremes at Afton: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
36.1 C (97.0 F)
2002
32.8 C (91.0 F)
70
Coldest night (TNn)
-43.3 C (-45.9 F)
1979
-30.6 C (-23.1 F)
70
Wettest day (Rx1day)
52.3 mm (2.1 in)
2008
24.3 mm (1.0 in)
70
Wettest five days (Rx5day)
94.7 mm (3.7 in)
2008
45.8 mm (1.8 in)
70
Longest dry spell (CDD)
57 days
1974
27 days
70
Hottest day (TXx)
The hottest day of the year at Afton, 1957 to 2026. The record is 36.1 C (97.0 F) in 2002, marked on the chart; the median year is 32.8 C (91.0 F).
Hottest day (TXx) at Afton by year
Year
Hottest day (TXx)
1957
30.6 C (87.1 F)
1958
32.8 C (91.0 F)
1959
32.2 C (90.0 F)
1960
32.2 C (90.0 F)
1961
33.9 C (93.0 F)
1962
30.6 C (87.1 F)
1963
32.8 C (91.0 F)
1964
31.7 C (89.1 F)
1965
34.4 C (93.9 F)
1966
33.3 C (91.9 F)
1967
35.0 C (95.0 F)
1968
31.7 C (89.1 F)
1969
30.0 C (86.0 F)
1970
31.1 C (88.0 F)
1971
32.2 C (90.0 F)
1972
33.9 C (93.0 F)
1973
31.7 C (89.1 F)
1974
33.3 C (91.9 F)
1975
33.3 C (91.9 F)
1976
35.0 C (95.0 F)
1977
29.4 C (84.9 F)
1978
31.7 C (89.1 F)
1979
26.1 C (79.0 F)
1980
31.1 C (88.0 F)
1981
30.0 C (86.0 F)
1982
31.7 C (89.1 F)
1983
32.8 C (91.0 F)
1984
32.2 C (90.0 F)
1985
33.3 C (91.9 F)
1986
31.7 C (89.1 F)
1987
30.6 C (87.1 F)
1988
34.4 C (93.9 F)
1989
33.3 C (91.9 F)
1990
35.0 C (95.0 F)
1991
32.8 C (91.0 F)
1992
34.4 C (93.9 F)
1993
28.9 C (84.0 F)
1994
32.8 C (91.0 F)
1995
31.7 C (89.1 F)
1996
33.3 C (91.9 F)
1997
31.7 C (89.1 F)
1998
22.2 C (72.0 F)
1999
31.7 C (89.1 F)
2000
35.6 C (96.1 F)
2001
35.0 C (95.0 F)
2002
36.1 C (97.0 F)
2003
34.4 C (93.9 F)
2004
31.7 C (89.1 F)
2005
33.9 C (93.0 F)
2006
17.2 C (63.0 F)
2007
35.0 C (95.0 F)
2008
32.8 C (91.0 F)
2009
33.3 C (91.9 F)
2010
21.7 C (71.1 F)
2011
27.8 C (82.0 F)
2012
33.3 C (91.9 F)
2013
32.8 C (91.0 F)
2014
31.7 C (89.1 F)
2015
32.8 C (91.0 F)
2016
32.2 C (90.0 F)
2017
33.3 C (91.9 F)
2018
33.3 C (91.9 F)
2019
32.8 C (91.0 F)
2020
33.3 C (91.9 F)
2021
32.8 C (91.0 F)
2022
33.3 C (91.9 F)
2023
33.3 C (91.9 F)
2024
33.3 C (91.9 F)
2025
31.7 C (89.1 F)
2026
26.7 C (80.1 F)
Coldest night (TNn)
The coldest night of the year at Afton, 1957 to 2026. The record is -43.3 C (-45.9 F) in 1979, marked on the chart; the median year is -30.6 C (-23.1 F).
Coldest night (TNn) at Afton by year
Year
Coldest night (TNn)
1957
-28.9 C (-20.0 F)
1958
-31.7 C (-25.1 F)
1959
-31.1 C (-24.0 F)
1960
-34.4 C (-29.9 F)
1961
-33.3 C (-27.9 F)
1962
-38.3 C (-36.9 F)
1963
-37.2 C (-35.0 F)
1964
-33.9 C (-29.0 F)
1965
-27.8 C (-18.0 F)
1966
-29.4 C (-20.9 F)
1967
-27.8 C (-18.0 F)
1968
-28.9 C (-20.0 F)
1969
-30.6 C (-23.1 F)
1970
-31.7 C (-25.1 F)
1971
-39.4 C (-38.9 F)
1972
-38.9 C (-38.0 F)
1973
-32.2 C (-26.0 F)
1974
-40.0 C (-40.0 F)
1975
-33.3 C (-27.9 F)
1976
-30.0 C (-22.0 F)
1977
-32.2 C (-26.0 F)
1978
-36.7 C (-34.1 F)
1979
-43.3 C (-45.9 F)
1980
-34.4 C (-29.9 F)
1981
-27.8 C (-18.0 F)
1982
-40.0 C (-40.0 F)
1983
-30.6 C (-23.1 F)
1984
-37.8 C (-36.0 F)
1985
-38.3 C (-36.9 F)
1986
-27.2 C (-17.0 F)
1987
-32.2 C (-26.0 F)
1988
-33.9 C (-29.0 F)
1989
-37.8 C (-36.0 F)
1990
-38.3 C (-36.9 F)
1991
-30.0 C (-22.0 F)
1992
-32.2 C (-26.0 F)
1993
-30.0 C (-22.0 F)
1994
-30.0 C (-22.0 F)
1995
-30.6 C (-23.1 F)
1996
-33.9 C (-29.0 F)
1997
-28.9 C (-20.0 F)
1998
-28.3 C (-18.9 F)
1999
-28.3 C (-18.9 F)
2000
-27.2 C (-17.0 F)
2001
-31.7 C (-25.1 F)
2002
-32.2 C (-26.0 F)
2003
-28.3 C (-18.9 F)
2004
-28.3 C (-18.9 F)
2005
-27.2 C (-17.0 F)
2006
-25.6 C (-14.1 F)
2007
-32.2 C (-26.0 F)
2008
-28.3 C (-18.9 F)
2009
-27.8 C (-18.0 F)
2010
-29.4 C (-20.9 F)
2011
-24.4 C (-11.9 F)
2012
-24.4 C (-11.9 F)
2013
-27.2 C (-17.0 F)
2014
-31.7 C (-25.1 F)
2015
-31.7 C (-25.1 F)
2016
-27.8 C (-18.0 F)
2017
-32.8 C (-27.0 F)
2018
-25.0 C (-13.0 F)
2019
-26.7 C (-16.1 F)
2020
-27.8 C (-18.0 F)
2021
-24.4 C (-11.9 F)
2022
-27.8 C (-18.0 F)
2023
-31.7 C (-25.1 F)
2024
-27.8 C (-18.0 F)
2025
-30.6 C (-23.1 F)
2026
-22.8 C (-9.0 F)
Wettest day (Rx1day)
The wettest day of the year at Afton, 1957 to 2026. The record is 52.3 mm (2.1 in) in 2008, marked on the chart; the median year is 24.3 mm (1.0 in).
Wettest day (Rx1day) at Afton by year
Year
Wettest day (Rx1day)
1957
24.1 mm (0.9 in)
1958
25.4 mm (1.0 in)
1959
17.0 mm (0.7 in)
1960
24.1 mm (0.9 in)
1961
22.9 mm (0.9 in)
1962
21.3 mm (0.8 in)
1963
23.4 mm (0.9 in)
1964
43.4 mm (1.7 in)
1965
29.2 mm (1.1 in)
1966
40.6 mm (1.6 in)
1967
40.6 mm (1.6 in)
1968
25.7 mm (1.0 in)
1969
24.9 mm (1.0 in)
1970
22.1 mm (0.9 in)
1971
19.3 mm (0.8 in)
1972
23.9 mm (0.9 in)
1973
18.3 mm (0.7 in)
1974
20.3 mm (0.8 in)
1975
25.9 mm (1.0 in)
1976
20.3 mm (0.8 in)
1977
23.1 mm (0.9 in)
1978
25.1 mm (1.0 in)
1979
15.2 mm (0.6 in)
1980
36.1 mm (1.4 in)
1981
19.1 mm (0.8 in)
1982
38.1 mm (1.5 in)
1983
27.9 mm (1.1 in)
1984
38.4 mm (1.5 in)
1985
19.8 mm (0.8 in)
1986
23.4 mm (0.9 in)
1987
35.8 mm (1.4 in)
1988
17.3 mm (0.7 in)
1989
16.5 mm (0.6 in)
1990
25.9 mm (1.0 in)
1991
29.2 mm (1.1 in)
1992
17.0 mm (0.7 in)
1993
21.3 mm (0.8 in)
1994
31.8 mm (1.3 in)
1995
21.8 mm (0.9 in)
1996
26.7 mm (1.1 in)
1997
31.8 mm (1.3 in)
1998
17.3 mm (0.7 in)
1999
30.5 mm (1.2 in)
2000
23.4 mm (0.9 in)
2001
22.1 mm (0.9 in)
2002
19.8 mm (0.8 in)
2003
19.6 mm (0.8 in)
2004
31.5 mm (1.2 in)
2005
16.5 mm (0.6 in)
2006
11.4 mm (0.4 in)
2007
51.8 mm (2.0 in)
2008
52.3 mm (2.1 in)
2009
19.6 mm (0.8 in)
2010
21.1 mm (0.8 in)
2011
13.5 mm (0.5 in)
2012
35.6 mm (1.4 in)
2013
21.3 mm (0.8 in)
2014
34.0 mm (1.3 in)
2015
27.2 mm (1.1 in)
2016
30.2 mm (1.2 in)
2017
29.5 mm (1.2 in)
2018
24.4 mm (1.0 in)
2019
33.8 mm (1.3 in)
2020
27.4 mm (1.1 in)
2021
31.5 mm (1.2 in)
2022
27.7 mm (1.1 in)
2023
30.5 mm (1.2 in)
2024
15.7 mm (0.6 in)
2025
31.8 mm (1.3 in)
2026
11.9 mm (0.5 in)
Wettest five days (Rx5day)
The wettest five days of the year at Afton, 1957 to 2026. The record is 94.7 mm (3.7 in) in 2008, marked on the chart; the median year is 45.8 mm (1.8 in).
Wettest five days (Rx5day) at Afton by year
Year
Wettest five days (Rx5day)
1957
64.4 mm (2.5 in)
1958
35.3 mm (1.4 in)
1959
36.0 mm (1.4 in)
1960
47.7 mm (1.9 in)
1961
41.7 mm (1.6 in)
1962
53.1 mm (2.1 in)
1963
55.4 mm (2.2 in)
1964
79.1 mm (3.1 in)
1965
54.6 mm (2.1 in)
1966
50.0 mm (2.0 in)
1967
45.4 mm (1.8 in)
1968
49.4 mm (1.9 in)
1969
56.4 mm (2.2 in)
1970
47.8 mm (1.9 in)
1971
37.0 mm (1.5 in)
1972
39.4 mm (1.6 in)
1973
35.5 mm (1.4 in)
1974
35.3 mm (1.4 in)
1975
49.5 mm (1.9 in)
1976
48.3 mm (1.9 in)
1977
47.2 mm (1.9 in)
1978
40.5 mm (1.6 in)
1979
19.3 mm (0.8 in)
1980
54.1 mm (2.1 in)
1981
41.2 mm (1.6 in)
1982
72.6 mm (2.9 in)
1983
44.9 mm (1.8 in)
1984
66.5 mm (2.6 in)
1985
24.0 mm (0.9 in)
1986
59.6 mm (2.3 in)
1987
52.1 mm (2.1 in)
1988
37.5 mm (1.5 in)
1989
26.3 mm (1.0 in)
1990
68.1 mm (2.7 in)
1991
47.7 mm (1.9 in)
1992
36.8 mm (1.4 in)
1993
47.8 mm (1.9 in)
1994
39.4 mm (1.6 in)
1995
48.2 mm (1.9 in)
1996
49.3 mm (1.9 in)
1997
40.6 mm (1.6 in)
1998
43.0 mm (1.7 in)
1999
30.5 mm (1.2 in)
2000
27.7 mm (1.1 in)
2001
36.9 mm (1.5 in)
2002
41.0 mm (1.6 in)
2003
28.5 mm (1.1 in)
2004
36.8 mm (1.4 in)
2005
32.5 mm (1.3 in)
2006
18.0 mm (0.7 in)
2007
55.9 mm (2.2 in)
2008
94.7 mm (3.7 in)
2009
57.4 mm (2.3 in)
2010
23.6 mm (0.9 in)
2011
22.1 mm (0.9 in)
2012
38.9 mm (1.5 in)
2013
44.9 mm (1.8 in)
2014
72.3 mm (2.8 in)
2015
48.7 mm (1.9 in)
2016
66.4 mm (2.6 in)
2017
46.2 mm (1.8 in)
2018
37.1 mm (1.5 in)
2019
61.5 mm (2.4 in)
2020
50.8 mm (2.0 in)
2021
50.3 mm (2.0 in)
2022
48.8 mm (1.9 in)
2023
43.4 mm (1.7 in)
2024
30.7 mm (1.2 in)
2025
46.8 mm (1.8 in)
2026
26.4 mm (1.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Afton, 1957 to 2026. The record is 57 days in 1974, marked on the chart; the median year is 27 days.
Longest dry spell (CDD) at Afton by year
Year
Longest dry spell (CDD)
1957
25 days
1958
26 days
1959
28 days
1960
29 days
1961
31 days
1962
33 days
1963
44 days
1964
27 days
1965
23 days
1966
29 days
1967
42 days
1968
41 days
1969
25 days
1970
28 days
1971
20 days
1972
24 days
1973
17 days
1974
57 days
1975
41 days
1976
30 days
1977
37 days
1978
27 days
1979
24 days
1980
20 days
1981
25 days
1982
14 days
1983
17 days
1984
14 days
1985
29 days
1986
25 days
1987
28 days
1988
39 days
1989
22 days
1990
31 days
1991
21 days
1992
30 days
1993
21 days
1994
28 days
1995
20 days
1996
48 days
1997
19 days
1998
37 days
1999
31 days
2000
16 days
2001
23 days
2002
33 days
2003
16 days
2004
22 days
2005
23 days
2006
11 days
2007
19 days
2008
34 days
2009
33 days
2010
14 days
2011
10 days
2012
38 days
2013
30 days
2014
34 days
2015
25 days
2016
27 days
2017
23 days
2018
35 days
2019
28 days
2020
33 days
2021
26 days
2022
20 days
2023
18 days
2024
28 days
2025
42 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
47 years with a frost
Across 47 years with a frost, the median last spring frost at Afton falls on 23 June and the median first autumn frost on 9 August, which leaves a median of 53 days between them.
Fitted over all years, the growing season changes by +11.7 days per decade at this station.
Frost dates and growing season at Afton
Measure
Median, all years
Earliest period
Recent period (1980 to 2025)
Recent against earliest
Fitted trend
Last spring frost
23 June
n/a
20 June
n/a
-1.9 days per decade
First autumn frost
9 August
n/a
26 August
n/a
+9.8 days per decade
Growing days
53 days
n/a
70 days
n/a
+11.7 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
54 years, 1958 to 2025
A day with at least 26.1 mm (1.0 in) of rain is expected about once in 2 years. A day with at least 55.9 mm (2.2 in) of rain is expected about once in 100 years.
Rainfall return levels at Afton: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
26.1 mm (1.0 in)
5 years
33.6 mm (1.3 in)
10 years
38.7 mm (1.5 in)
25 years
45.5 mm (1.8 in)
50 years
50.6 mm (2.0 in)
100 years
55.9 mm (2.2 in)
Longer than the 54 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, 54 years of values from 1958 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: 52.3 mm (2.1 in) in 2008; 51.8 mm (2.0 in) in 2007; 43.4 mm (1.7 in) in 1964.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Climate Twins
2002 to 2025 against 1961 to 1990
Over 2002 to 2025, Afton had a mean temperature of 4.2 C (39.6 F) and 514.5 mm (20.3 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Green Mt Dam (United States, 497 km away), Alta 1 NNW (United States, 116 km away) and Driggs (United States, 117 km away).
Climate twins of Afton: stations whose 1961 to 1990 climate is closest to its 2002 to 2025 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 Afton standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Afton 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.