Record envelope, standing records and threshold days for Dewey (USC00422150), Utah, United States, with 38 years of record.
Key Facts for Dewey
Dewey (USC00422150) is a weather station in Utah, United States at 38.81 latitude and -109.30 longitude, 1,256 m (4,120 ft) above sea level.
The station reports from 1967 to 2004, 38 years of record.
1,464 records set at Dewey still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Dewey set a daily record low maximum temperature of 21.1 C (70.0 F) on 30 May 2004.
About the Station
Location: Utah, United States, 38.81 latitude, -109.30 longitude.
Elevation: 1,256 m (4,120 ft).
Period of record: 1967 to 2004, 38 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 Dewey. 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 Dewey, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
17.8 C (64.0 F)
-31.7 C (-25.1 F)
n/a
n/a
Feb
22.8 C (73.0 F)
-31.1 C (-24.0 F)
n/a
n/a
Mar
28.9 C (84.0 F)
-15.6 C (3.9 F)
n/a
n/a
Apr
35.0 C (95.0 F)
-9.4 C (15.1 F)
n/a
n/a
May
40.6 C (105.1 F)
-4.4 C (24.1 F)
n/a
n/a
Jun
43.9 C (111.0 F)
0.6 C (33.1 F)
n/a
n/a
Jul
45.6 C (114.1 F)
5.6 C (42.1 F)
n/a
n/a
Aug
43.3 C (109.9 F)
-1.1 C (30.0 F)
n/a
n/a
Sep
41.7 C (107.1 F)
-5.0 C (23.0 F)
n/a
n/a
Oct
34.4 C (93.9 F)
-12.8 C (9.0 F)
n/a
n/a
Nov
26.7 C (80.1 F)
-20.6 C (-5.1 F)
n/a
n/a
Dec
21.7 C (71.1 F)
-25.0 C (-13.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Dewey still stand. 1971 holds the most, with 66.
Standing records at Dewey by the year they were set
Year set
Standing records
1967
18
1968
43
1969
36
1970
63
1971
66
1972
38
1973
58
1974
60
1975
38
1976
33
1977
38
1978
46
1979
45
1980
40
1981
43
1982
29
1983
26
1984
41
1985
23
1986
49
1987
26
1988
38
1989
65
1990
41
1991
29
1992
33
1993
12
1994
29
1995
61
1996
47
1997
28
1998
22
1999
34
2000
35
2001
31
2002
45
2003
41
2004
14
All-Time Record Progression
4 new records
4 all-time records were set at Dewey between 12 December 2001 and 3 April 2003. Each dot is a new record.
When Dewey set new all-time records
Date
Kind
Detail
2001-12-12
Record daily precipitation
Record daily precipitation 50.8 mm (2.0 in)
2002-01-04
Record daily precipitation
Record daily precipitation 76.2 mm (3.0 in)
2002-07-01
Record high maximum temperature
Record high maximum temperature 45.6 C (114.1 F)
2003-04-03
Record daily precipitation
Record daily precipitation 101.6 mm (4.0 in)
Wettest Day of Each Month
Apr: 101.6 mm (4.0 in)
The wettest day on record for each calendar month at Dewey. The most was 101.6 mm (4.0 in) on 3 April 2003.
Record daily precipitation for each month at Dewey
Month
Record daily precipitation (mm)
Date
Jan
76.2 mm (3.0 in)
4 January 2002
Feb
21.6 mm (0.9 in)
21 February 1996
Mar
26.7 mm (1.1 in)
7 March 1996
Apr
101.6 mm (4.0 in)
3 April 2003
May
29.2 mm (1.1 in)
17 May 1993
Jun
37.1 mm (1.5 in)
24 June 1969
Jul
39.4 mm (1.6 in)
22 July 1983
Aug
30.5 mm (1.2 in)
21 August 1995
Sep
20.8 mm (0.8 in)
18 September 1985
Oct
24.1 mm (0.9 in)
22 October 1984
Nov
25.4 mm (1.0 in)
6 November 1987
Dec
50.8 mm (2.0 in)
12 December 2001
Period of Record Coverage
1967 to 2004
Complete yearUnder 90 percent of days
38 years of record at Dewey, 1967 to 2004. 8 years have data for under 90 percent of days and are left out of rankings: 1967, 1968, 1969, 1972, 1979, 1995, 2003, 2004.
Cooler than the station meanWarmer than the station mean
One stripe for each of 30 complete years at Dewey, 1969 to 2002. Blue stripes are years cooler than the station's own mean of 12.1 C (53.8 F); red stripes are warmer. The coolest year was 1973, at 10.2 C (50.4 F), and the warmest was 1994, at 13.5 C (56.4 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Dewey as warming stripes, 1969 to 2002
Year
Annual mean temperature
Difference from the station mean
1969
12.1 C
0.00 C
1970
11.6 C
-0.48 C
1971
11.8 C
-0.29 C
1973
10.2 C
-1.89 C
1974
11.3 C
-0.85 C
1975
10.5 C
-1.66 C
1976
11.6 C
-0.52 C
1977
12.4 C
+0.33 C
1978
12.4 C
+0.30 C
1980
12.5 C
+0.34 C
1981
13.2 C
+1.11 C
1982
11.8 C
-0.28 C
1983
12.2 C
+0.09 C
1984
10.9 C
-1.25 C
1985
12.5 C
+0.36 C
1986
13.1 C
+0.99 C
1987
12.0 C
-0.09 C
1988
11.1 C
-1.01 C
1989
11.8 C
-0.27 C
1990
13.1 C
+0.96 C
1991
11.4 C
-0.67 C
1992
12.1 C
+0.01 C
1993
12.1 C
+0.02 C
1994
13.5 C
+1.43 C
1996
13.5 C
+1.34 C
1997
12.2 C
+0.13 C
1998
12.6 C
+0.51 C
1999
12.3 C
+0.22 C
2001
13.3 C
+1.15 C
2002
12.2 C
+0.08 C
The annual mean temperature here has risen by 0.4 C (0.1 to 0.7) per decade over 1969 to 2002. In Fahrenheit: 0.7 F (0.2 to 1.3) per decade. The slope is a straight line fitted to 30 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Dewey
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.4 C (0.1 to 0.7) per decade
0.7 F (0.2 to 1.3) per decade
1969 to 2002
30
Rise
Mean daily maximum
0.6 C (0.3 to 1.0) per decade
1.1 F (0.5 to 1.8) per decade
1969 to 2002
30
Rise
Mean daily minimum
0.2 C (-0.2 to 0.5) per decade
0.3 F (-0.3 to 1.0) per decade
1969 to 2002
30
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
1967 to 2004
Yearly extremes at Dewey: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
45.6 C (114.1 F)
2002
42.8 C (109.0 F)
38
Coldest night (TNn)
-31.7 C (-25.1 F)
1989
-20.5 C (-5.0 F)
38
Wettest day (Rx1day)
101.6 mm (4.0 in)
2003
20.3 mm (0.8 in)
38
Wettest five days (Rx5day)
101.6 mm (4.0 in)
2003
31.8 mm (1.3 in)
38
Longest dry spell (CDD)
108 days
2002
47 days
38
Hottest day (TXx)
The hottest day of the year at Dewey, 1967 to 2004. The record is 45.6 C (114.1 F) in 2002, marked on the chart; the median year is 42.8 C (109.0 F).
Hottest day (TXx) at Dewey by year
Year
Hottest day (TXx)
1967
30.0 C (86.0 F)
1968
40.6 C (105.1 F)
1969
42.2 C (108.0 F)
1970
43.9 C (111.0 F)
1971
43.9 C (111.0 F)
1972
43.3 C (109.9 F)
1973
42.8 C (109.0 F)
1974
42.2 C (108.0 F)
1975
40.6 C (105.1 F)
1976
43.3 C (109.9 F)
1977
41.1 C (106.0 F)
1978
43.3 C (109.9 F)
1979
42.8 C (109.0 F)
1980
41.7 C (107.1 F)
1981
44.4 C (111.9 F)
1982
43.3 C (109.9 F)
1983
39.4 C (102.9 F)
1984
38.9 C (102.0 F)
1985
42.8 C (109.0 F)
1986
42.2 C (108.0 F)
1987
41.1 C (106.0 F)
1988
43.3 C (109.9 F)
1989
45.0 C (113.0 F)
1990
43.9 C (111.0 F)
1991
43.9 C (111.0 F)
1992
41.7 C (107.1 F)
1993
40.6 C (105.1 F)
1994
42.8 C (109.0 F)
1995
43.3 C (109.9 F)
1996
42.2 C (108.0 F)
1997
41.1 C (106.0 F)
1998
43.9 C (111.0 F)
1999
41.1 C (106.0 F)
2000
42.2 C (108.0 F)
2001
42.8 C (109.0 F)
2002
45.6 C (114.1 F)
2003
45.6 C (114.1 F)
2004
35.0 C (95.0 F)
Coldest night (TNn)
The coldest night of the year at Dewey, 1967 to 2004. The record is -31.7 C (-25.1 F) in 1989, marked on the chart; the median year is -20.5 C (-5.0 F).
Coldest night (TNn) at Dewey by year
Year
Coldest night (TNn)
1967
-23.9 C (-11.0 F)
1968
-28.3 C (-18.9 F)
1969
-22.2 C (-8.0 F)
1970
-18.9 C (-2.0 F)
1971
-27.8 C (-18.0 F)
1972
-20.0 C (-4.0 F)
1973
-30.6 C (-23.1 F)
1974
-25.6 C (-14.1 F)
1975
-23.9 C (-11.0 F)
1976
-23.9 C (-11.0 F)
1977
-24.4 C (-11.9 F)
1978
-23.9 C (-11.0 F)
1979
-19.4 C (-2.9 F)
1980
-12.2 C (10.0 F)
1981
-12.8 C (9.0 F)
1982
-23.3 C (-9.9 F)
1983
-15.6 C (3.9 F)
1984
-29.4 C (-20.9 F)
1985
-17.8 C (0.0 F)
1986
-14.4 C (6.1 F)
1987
-18.3 C (-0.9 F)
1988
-26.7 C (-16.1 F)
1989
-31.7 C (-25.1 F)
1990
-25.0 C (-13.0 F)
1991
-25.0 C (-13.0 F)
1992
-23.3 C (-9.9 F)
1993
-14.4 C (6.1 F)
1994
-13.9 C (7.0 F)
1995
-16.1 C (3.0 F)
1996
-15.6 C (3.9 F)
1997
-15.6 C (3.9 F)
1998
-23.3 C (-9.9 F)
1999
-16.7 C (1.9 F)
2000
-21.1 C (-6.0 F)
2001
-15.6 C (3.9 F)
2002
-17.8 C (0.0 F)
2003
-13.9 C (7.0 F)
2004
-16.1 C (3.0 F)
Wettest day (Rx1day)
The wettest day of the year at Dewey, 1967 to 2004. The record is 101.6 mm (4.0 in) in 2003, marked on the chart; the median year is 20.3 mm (0.8 in).
Wettest day (Rx1day) at Dewey by year
Year
Wettest day (Rx1day)
1967
10.7 mm (0.4 in)
1968
16.5 mm (0.6 in)
1969
37.1 mm (1.5 in)
1970
16.8 mm (0.7 in)
1971
20.8 mm (0.8 in)
1972
18.0 mm (0.7 in)
1973
23.1 mm (0.9 in)
1974
22.9 mm (0.9 in)
1975
17.8 mm (0.7 in)
1976
10.4 mm (0.4 in)
1977
18.3 mm (0.7 in)
1978
21.6 mm (0.9 in)
1979
20.3 mm (0.8 in)
1980
20.3 mm (0.8 in)
1981
15.2 mm (0.6 in)
1982
16.5 mm (0.6 in)
1983
39.4 mm (1.6 in)
1984
24.1 mm (0.9 in)
1985
28.2 mm (1.1 in)
1986
25.4 mm (1.0 in)
1987
25.4 mm (1.0 in)
1988
18.3 mm (0.7 in)
1989
20.3 mm (0.8 in)
1990
17.8 mm (0.7 in)
1991
20.3 mm (0.8 in)
1992
24.1 mm (0.9 in)
1993
29.2 mm (1.1 in)
1994
20.3 mm (0.8 in)
1995
33.0 mm (1.3 in)
1996
26.7 mm (1.1 in)
1997
20.3 mm (0.8 in)
1998
22.1 mm (0.9 in)
1999
20.3 mm (0.8 in)
2000
12.7 mm (0.5 in)
2001
50.8 mm (2.0 in)
2002
76.2 mm (3.0 in)
2003
101.6 mm (4.0 in)
2004
16.5 mm (0.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Dewey, 1967 to 2004. The record is 101.6 mm (4.0 in) in 2003, marked on the chart; the median year is 31.8 mm (1.3 in).
Wettest five days (Rx5day) at Dewey by year
Year
Wettest five days (Rx5day)
1967
19.8 mm (0.8 in)
1968
19.0 mm (0.7 in)
1969
37.1 mm (1.5 in)
1970
31.8 mm (1.3 in)
1971
26.7 mm (1.1 in)
1972
42.1 mm (1.7 in)
1973
35.8 mm (1.4 in)
1974
31.0 mm (1.2 in)
1975
31.8 mm (1.3 in)
1976
10.4 mm (0.4 in)
1977
26.4 mm (1.0 in)
1978
29.2 mm (1.1 in)
1979
27.4 mm (1.1 in)
1980
33.3 mm (1.3 in)
1981
16.5 mm (0.6 in)
1982
31.8 mm (1.3 in)
1983
60.0 mm (2.4 in)
1984
31.0 mm (1.2 in)
1985
67.5 mm (2.7 in)
1986
26.7 mm (1.1 in)
1987
34.3 mm (1.4 in)
1988
36.6 mm (1.4 in)
1989
23.9 mm (0.9 in)
1990
25.4 mm (1.0 in)
1991
29.3 mm (1.2 in)
1992
38.4 mm (1.5 in)
1993
66.0 mm (2.6 in)
1994
33.0 mm (1.3 in)
1995
48.2 mm (1.9 in)
1996
36.8 mm (1.4 in)
1997
29.5 mm (1.2 in)
1998
42.9 mm (1.7 in)
1999
29.2 mm (1.1 in)
2000
19.5 mm (0.8 in)
2001
50.8 mm (2.0 in)
2002
76.2 mm (3.0 in)
2003
101.6 mm (4.0 in)
2004
21.8 mm (0.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Dewey, 1967 to 2004. The record is 108 days in 2002, marked on the chart; the median year is 47 days.
Longest dry spell (CDD) at Dewey by year
Year
Longest dry spell (CDD)
1967
22 days
1968
51 days
1969
38 days
1970
42 days
1971
105 days
1972
104 days
1973
39 days
1974
103 days
1975
82 days
1976
104 days
1977
49 days
1978
68 days
1979
63 days
1980
43 days
1981
30 days
1982
48 days
1983
34 days
1984
34 days
1985
39 days
1986
35 days
1987
48 days
1988
58 days
1989
72 days
1990
39 days
1991
40 days
1992
39 days
1993
62 days
1994
90 days
1995
32 days
1996
41 days
1997
47 days
1998
36 days
1999
67 days
2000
41 days
2001
47 days
2002
108 days
2003
99 days
2004
46 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
30 years with a frost
Across 30 years with a frost, the median last spring frost at Dewey falls on 3 May and the median first autumn frost on 4 October, which leaves a median of 153 days between them.
Fitted over all years, the growing season changes by +1.6 days per decade at this station.
Frost dates and growing season at Dewey
Measure
Median, all years
Earliest period
Recent period (1969 to 2002)
Recent against earliest
Fitted trend
Last spring frost
3 May
n/a
3 May
n/a
-0.4 days per decade
First autumn frost
4 October
n/a
4 October
n/a
+1.2 days per decade
Growing days
153 days
n/a
153 days
n/a
+1.6 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
31 years, 1968 to 2003
A day with at least 21.0 mm (0.8 in) of rain is expected about once in 2 years. A day with at least 113.9 mm (4.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Dewey: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
21.0 mm (0.8 in)
5 years
30.8 mm (1.2 in)
10 years
41.1 mm (1.6 in)
25 years
61.0 mm (2.4 in)
50 years
83.0 mm (3.3 in)
Longer than the 31 years of record
100 years
113.9 mm (4.5 in)
Longer than the 31 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, 31 years of values from 1968 to 2003.
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: 101.6 mm (4.0 in) in 2003; 76.2 mm (3.0 in) in 2002; 50.8 mm (2.0 in) in 2001.
Download the Data
Data for Dewey standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Dewey 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.