Record envelope, standing records and threshold days for Cody 21 SW (USC00481855), Wyoming, United States, with 52 years of record.
Key Facts for Cody 21 SW
Cody 21 SW (USC00481855) is a weather station in Wyoming, United States at 44.34 latitude and -109.39 longitude, 1,780 m (5,840 ft) above sea level.
The station reports from 1958 to 2009, 52 years of record.
1,464 records set at Cody 21 SW still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Cody 21 SW tied a daily record low maximum temperature of -14.4 C (6.1 F) on 25 January 2009.
About the Station
Location: Wyoming, United States, 44.34 latitude, -109.39 longitude.
Elevation: 1,780 m (5,840 ft).
Period of record: 1958 to 2009, 52 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 Cody 21 SW. 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 Cody 21 SW, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
20.0 C (68.0 F)
-33.9 C (-29.0 F)
n/a
n/a
Feb
20.0 C (68.0 F)
-43.9 C (-47.0 F)
n/a
n/a
Mar
22.8 C (73.0 F)
-30.6 C (-23.1 F)
n/a
n/a
Apr
30.6 C (87.1 F)
-20.0 C (-4.0 F)
n/a
n/a
May
33.3 C (91.9 F)
-11.1 C (12.0 F)
n/a
n/a
Jun
36.7 C (98.1 F)
-2.8 C (27.0 F)
n/a
n/a
Jul
37.8 C (100.0 F)
-1.1 C (30.0 F)
n/a
n/a
Aug
36.1 C (97.0 F)
-2.2 C (28.0 F)
n/a
n/a
Sep
34.4 C (93.9 F)
-17.2 C (1.0 F)
n/a
n/a
Oct
30.0 C (86.0 F)
-24.4 C (-11.9 F)
n/a
n/a
Nov
23.3 C (73.9 F)
-31.7 C (-25.1 F)
n/a
n/a
Dec
17.2 C (63.0 F)
-40.0 C (-40.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Cody 21 SW still stand. 1985 holds the most, with 60.
Standing records at Cody 21 SW by the year they were set
Year set
Standing records
1963
20
1964
16
1965
32
1970
22
1971
26
1972
59
1973
33
1974
29
1975
39
1976
29
1977
24
1978
26
1979
30
1980
39
1981
20
1982
29
1983
35
1984
46
1985
60
1986
45
1987
48
1988
45
1989
42
1990
32
1991
29
1992
36
1993
35
1994
24
1995
39
1996
40
1997
39
1998
29
1999
37
2000
38
2001
34
2002
42
2003
55
2004
24
2005
33
2006
34
2007
33
2008
32
2009
5
All-Time Record Progression
2 new records
2 all-time records were set at Cody 21 SW between 10 August 2000 and 13 July 2002. Each dot is a new record.
When Cody 21 SW set new all-time records
Date
Kind
Detail
2000-08-10
Record high minimum temperature
Record high minimum temperature 20.0 C (68.0 F)
2002-07-13
Record high maximum temperature
Record high maximum temperature 37.8 C (100.0 F)
Wettest Day of Each Month
Apr: 78.7 mm (3.1 in)
The wettest day on record for each calendar month at Cody 21 SW. The most was 78.7 mm (3.1 in) on 27 April 1963.
Record daily precipitation for each month at Cody 21 SW
Month
Record daily precipitation (mm)
Date
Jan
15.2 mm (0.6 in)
11 January 2000
Feb
20.1 mm (0.8 in)
19 February 1986
Mar
28.2 mm (1.1 in)
31 March 1980
Apr
78.7 mm (3.1 in)
27 April 1963
May
64.0 mm (2.5 in)
18 May 1978
Jun
46.5 mm (1.8 in)
15 June 1992
Jul
49.5 mm (1.9 in)
2 July 1975
Aug
24.4 mm (1.0 in)
7 August 1961
Sep
40.6 mm (1.6 in)
18 September 1961
Oct
37.3 mm (1.5 in)
28 October 1989
Nov
22.4 mm (0.9 in)
8 November 1985
Dec
15.5 mm (0.6 in)
23 December 1964
Period of Record Coverage
1963 to 2009
Complete yearUnder 90 percent of days
43 years of record at Cody 21 SW, 1963 to 2009. 4 years have data for under 90 percent of days and are left out of rankings: 1963, 1965, 1970, 2009.
Cooler than the station meanWarmer than the station mean
One stripe for each of 39 complete years at Cody 21 SW, 1964 to 2008. Blue stripes are years cooler than the station's own mean of 6.8 C (44.3 F); red stripes are warmer. The coolest year was 1975, at 5.2 C (41.4 F), and the warmest was 2007, at 8.3 C (46.9 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at Cody 21 SW as warming stripes, 1964 to 2008
Year
Annual mean temperature
Difference from the station mean
1964
6.1 C
-0.72 C
1971
6.3 C
-0.57 C
1972
6.2 C
-0.68 C
1973
6.4 C
-0.46 C
1974
6.6 C
-0.20 C
1975
5.2 C
-1.60 C
1976
6.8 C
-0.05 C
1977
6.9 C
+0.10 C
1978
5.5 C
-1.38 C
1979
6.0 C
-0.80 C
1980
7.1 C
+0.30 C
1981
7.6 C
+0.73 C
1982
5.6 C
-1.24 C
1983
6.3 C
-0.51 C
1984
6.4 C
-0.48 C
1985
5.4 C
-1.45 C
1986
7.1 C
+0.31 C
1987
7.5 C
+0.70 C
1988
7.9 C
+1.02 C
1989
6.2 C
-0.65 C
1990
7.1 C
+0.24 C
1991
7.2 C
+0.32 C
1992
7.5 C
+0.62 C
1993
5.8 C
-1.08 C
1994
7.5 C
+0.62 C
1995
6.7 C
-0.09 C
1996
6.2 C
-0.66 C
1997
6.8 C
-0.05 C
1998
7.1 C
+0.24 C
1999
7.8 C
+0.92 C
2000
7.3 C
+0.48 C
2001
7.8 C
+0.98 C
2002
6.7 C
-0.09 C
2003
7.6 C
+0.73 C
2004
7.6 C
+0.72 C
2005
7.3 C
+0.50 C
2006
8.0 C
+1.14 C
2007
8.3 C
+1.44 C
2008
7.3 C
+0.50 C
The annual mean temperature here has risen by 0.4 C (0.2 to 0.6) per decade over 1964 to 2008. In Fahrenheit: 0.7 F (0.4 to 1.0) per decade. The slope is a straight line fitted to 39 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Cody 21 SW
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.4 C (0.2 to 0.6) per decade
0.7 F (0.4 to 1.0) per decade
1964 to 2008
39
Rise
Mean daily maximum
0.4 C (0.2 to 0.6) per decade
0.7 F (0.3 to 1.1) per decade
1964 to 2008
39
Rise
Mean daily minimum
0.4 C (0.2 to 0.6) per decade
0.8 F (0.4 to 1.1) per decade
1964 to 2008
39
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
1958 to 2009
Yearly extremes at Cody 21 SW: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
37.8 C (100.0 F)
2002
35.0 C (95.0 F)
43
Coldest night (TNn)
-43.9 C (-47.0 F)
1989
-30.0 C (-22.0 F)
43
Wettest day (Rx1day)
78.7 mm (3.1 in)
1963
28.3 mm (1.1 in)
48
Wettest five days (Rx5day)
110.8 mm (4.4 in)
1978
40.0 mm (1.6 in)
48
Longest dry spell (CDD)
123 days
1961
34 days
48
Hottest day (TXx)
The hottest day of the year at Cody 21 SW, 1958 to 2009. The record is 37.8 C (100.0 F) in 2002, marked on the chart; the median year is 35.0 C (95.0 F).
Hottest day (TXx) at Cody 21 SW by year
Year
Hottest day (TXx)
1958
n/a
1959
n/a
1960
n/a
1961
n/a
1962
n/a
1963
29.4 C (84.9 F)
1964
33.3 C (91.9 F)
1965
32.8 C (91.0 F)
1970
34.4 C (93.9 F)
1971
36.1 C (97.0 F)
1972
33.9 C (93.0 F)
1973
35.6 C (96.1 F)
1974
33.9 C (93.0 F)
1975
34.4 C (93.9 F)
1976
36.7 C (98.1 F)
1977
34.4 C (93.9 F)
1978
33.3 C (91.9 F)
1979
36.1 C (97.0 F)
1980
34.4 C (93.9 F)
1981
35.0 C (95.0 F)
1982
34.4 C (93.9 F)
1983
35.6 C (96.1 F)
1984
34.4 C (93.9 F)
1985
35.0 C (95.0 F)
1986
35.6 C (96.1 F)
1987
32.2 C (90.0 F)
1988
37.2 C (99.0 F)
1989
36.7 C (98.1 F)
1990
36.1 C (97.0 F)
1991
35.0 C (95.0 F)
1992
33.9 C (93.0 F)
1993
33.3 C (91.9 F)
1994
33.3 C (91.9 F)
1995
35.0 C (95.0 F)
1996
35.0 C (95.0 F)
1997
33.3 C (91.9 F)
1998
37.2 C (99.0 F)
1999
34.4 C (93.9 F)
2000
36.1 C (97.0 F)
2001
36.1 C (97.0 F)
2002
37.8 C (100.0 F)
2003
36.7 C (98.1 F)
2004
34.4 C (93.9 F)
2005
37.8 C (100.0 F)
2006
37.2 C (99.0 F)
2007
37.8 C (100.0 F)
2008
35.6 C (96.1 F)
2009
20.0 C (68.0 F)
Coldest night (TNn)
The coldest night of the year at Cody 21 SW, 1958 to 2009. The record is -43.9 C (-47.0 F) in 1989, marked on the chart; the median year is -30.0 C (-22.0 F).
Coldest night (TNn) at Cody 21 SW by year
Year
Coldest night (TNn)
1958
n/a
1959
n/a
1960
n/a
1961
n/a
1962
n/a
1963
-25.0 C (-13.0 F)
1964
-37.8 C (-36.0 F)
1965
-28.3 C (-18.9 F)
1970
-22.2 C (-8.0 F)
1971
-29.4 C (-20.9 F)
1972
-37.2 C (-35.0 F)
1973
-31.7 C (-25.1 F)
1974
-30.0 C (-22.0 F)
1975
-27.8 C (-18.0 F)
1976
-28.9 C (-20.0 F)
1977
-27.2 C (-17.0 F)
1978
-35.6 C (-32.1 F)
1979
-30.6 C (-23.1 F)
1980
-33.9 C (-29.0 F)
1981
-35.0 C (-31.0 F)
1982
-32.2 C (-26.0 F)
1983
-39.4 C (-38.9 F)
1984
-31.7 C (-25.1 F)
1985
-34.4 C (-29.9 F)
1986
-30.0 C (-22.0 F)
1987
-28.3 C (-18.9 F)
1988
-26.7 C (-16.1 F)
1989
-43.9 C (-47.0 F)
1990
-40.0 C (-40.0 F)
1991
-28.9 C (-20.0 F)
1992
-28.3 C (-18.9 F)
1993
-31.7 C (-25.1 F)
1994
-27.2 C (-17.0 F)
1995
-26.1 C (-15.0 F)
1996
-34.4 C (-29.9 F)
1997
-30.0 C (-22.0 F)
1998
-32.8 C (-27.0 F)
1999
-22.2 C (-8.0 F)
2000
-25.0 C (-13.0 F)
2001
-28.9 C (-20.0 F)
2002
-30.0 C (-22.0 F)
2003
-33.3 C (-27.9 F)
2004
-31.7 C (-25.1 F)
2005
-28.9 C (-20.0 F)
2006
-33.3 C (-27.9 F)
2007
-30.6 C (-23.1 F)
2008
-25.0 C (-13.0 F)
2009
-24.4 C (-11.9 F)
Wettest day (Rx1day)
The wettest day of the year at Cody 21 SW, 1958 to 2009. The record is 78.7 mm (3.1 in) in 1963, marked on the chart; the median year is 28.3 mm (1.1 in).
Wettest day (Rx1day) at Cody 21 SW by year
Year
Wettest day (Rx1day)
1958
7.1 mm (0.28 in)
1959
15.2 mm (0.6 in)
1960
21.6 mm (0.9 in)
1961
42.4 mm (1.7 in)
1962
21.8 mm (0.9 in)
1963
78.7 mm (3.1 in)
1964
66.0 mm (2.6 in)
1965
20.1 mm (0.8 in)
1970
14.7 mm (0.6 in)
1971
36.1 mm (1.4 in)
1972
20.6 mm (0.8 in)
1973
35.8 mm (1.4 in)
1974
30.7 mm (1.2 in)
1975
49.5 mm (1.9 in)
1976
31.5 mm (1.2 in)
1977
17.0 mm (0.7 in)
1978
64.0 mm (2.5 in)
1979
18.3 mm (0.7 in)
1980
28.2 mm (1.1 in)
1981
23.4 mm (0.9 in)
1982
38.4 mm (1.5 in)
1983
21.3 mm (0.8 in)
1984
33.3 mm (1.3 in)
1985
22.4 mm (0.9 in)
1986
20.1 mm (0.8 in)
1987
30.7 mm (1.2 in)
1988
16.5 mm (0.6 in)
1989
37.3 mm (1.5 in)
1990
30.7 mm (1.2 in)
1991
19.8 mm (0.8 in)
1992
46.5 mm (1.8 in)
1993
42.9 mm (1.7 in)
1994
27.7 mm (1.1 in)
1995
28.4 mm (1.1 in)
1996
31.5 mm (1.2 in)
1997
28.7 mm (1.1 in)
1998
20.6 mm (0.8 in)
1999
22.9 mm (0.9 in)
2000
37.6 mm (1.5 in)
2001
19.1 mm (0.8 in)
2002
13.0 mm (0.5 in)
2003
19.3 mm (0.8 in)
2004
15.7 mm (0.6 in)
2005
41.1 mm (1.6 in)
2006
34.5 mm (1.4 in)
2007
38.6 mm (1.5 in)
2008
42.7 mm (1.7 in)
2009
4.3 mm (0.17 in)
Wettest five days (Rx5day)
The wettest five days of the year at Cody 21 SW, 1958 to 2009. The record is 110.8 mm (4.4 in) in 1978, marked on the chart; the median year is 40.0 mm (1.6 in).
Wettest five days (Rx5day) at Cody 21 SW by year
Year
Wettest five days (Rx5day)
1958
7.1 mm (0.28 in)
1959
22.8 mm (0.9 in)
1960
21.6 mm (0.9 in)
1961
55.9 mm (2.2 in)
1962
36.3 mm (1.4 in)
1963
89.4 mm (3.5 in)
1964
69.8 mm (2.7 in)
1965
32.5 mm (1.3 in)
1970
21.5 mm (0.8 in)
1971
58.2 mm (2.3 in)
1972
38.9 mm (1.5 in)
1973
38.4 mm (1.5 in)
1974
75.4 mm (3.0 in)
1975
54.6 mm (2.1 in)
1976
46.3 mm (1.8 in)
1977
35.5 mm (1.4 in)
1978
110.8 mm (4.4 in)
1979
25.2 mm (1.0 in)
1980
47.4 mm (1.9 in)
1981
34.6 mm (1.4 in)
1982
67.4 mm (2.7 in)
1983
23.8 mm (0.9 in)
1984
48.1 mm (1.9 in)
1985
41.6 mm (1.6 in)
1986
35.0 mm (1.4 in)
1987
32.5 mm (1.3 in)
1988
28.2 mm (1.1 in)
1989
39.8 mm (1.6 in)
1990
47.5 mm (1.9 in)
1991
34.7 mm (1.4 in)
1992
52.8 mm (2.1 in)
1993
60.7 mm (2.4 in)
1994
41.7 mm (1.6 in)
1995
37.8 mm (1.5 in)
1996
47.4 mm (1.9 in)
1997
48.5 mm (1.9 in)
1998
23.6 mm (0.9 in)
1999
42.9 mm (1.7 in)
2000
46.7 mm (1.8 in)
2001
22.4 mm (0.9 in)
2002
16.8 mm (0.7 in)
2003
25.2 mm (1.0 in)
2004
24.9 mm (1.0 in)
2005
81.5 mm (3.2 in)
2006
40.3 mm (1.6 in)
2007
40.2 mm (1.6 in)
2008
73.9 mm (2.9 in)
2009
6.3 mm (0.25 in)
Longest dry spell (CDD)
The longest dry spell of the year at Cody 21 SW, 1958 to 2009. The record is 123 days in 1961, marked on the chart; the median year is 34 days.
Longest dry spell (CDD) at Cody 21 SW by year
Year
Longest dry spell (CDD)
1958
20 days
1959
49 days
1960
76 days
1961
123 days
1962
113 days
1963
88 days
1964
53 days
1965
80 days
1970
30 days
1971
19 days
1972
32 days
1973
35 days
1974
21 days
1975
25 days
1976
35 days
1977
28 days
1978
32 days
1979
56 days
1980
30 days
1981
30 days
1982
23 days
1983
36 days
1984
35 days
1985
27 days
1986
36 days
1987
34 days
1988
40 days
1989
25 days
1990
37 days
1991
20 days
1992
30 days
1993
38 days
1994
26 days
1995
28 days
1996
29 days
1997
25 days
1998
27 days
1999
63 days
2000
31 days
2001
34 days
2002
37 days
2003
25 days
2004
34 days
2005
43 days
2006
39 days
2007
34 days
2008
40 days
2009
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
39 years with a frost
Across 39 years with a frost, the median last spring frost at Cody 21 SW falls on 8 June and the median first autumn frost on 8 September, which leaves a median of 95 days between them.
Fitted over all years, the growing season changes by +5.7 days per decade at this station.
Frost dates and growing season at Cody 21 SW
Measure
Median, all years
Earliest period
Recent period (1979 to 2008)
Recent against earliest
Fitted trend
Last spring frost
8 June
n/a
9 June
n/a
+0.8 days per decade
First autumn frost
8 September
n/a
11 September
n/a
+6.4 days per decade
Growing days
95 days
n/a
95 days
n/a
+5.7 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
41 years, 1961 to 2008
A day with at least 28.8 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 70.6 mm (2.8 in) of rain is expected about once in 100 years.
Rainfall return levels at Cody 21 SW: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
28.8 mm (1.1 in)
5 years
39.8 mm (1.6 in)
10 years
47.1 mm (1.9 in)
25 years
56.5 mm (2.2 in)
50 years
63.5 mm (2.5 in)
Longer than the 41 years of record
100 years
70.6 mm (2.8 in)
Longer than the 41 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, 41 years of values from 1961 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: 66.0 mm (2.6 in) in 1964; 64.0 mm (2.5 in) in 1978; 49.5 mm (1.9 in) in 1975.
Download the Data
Data for Cody 21 SW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Cody 21 SW 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.