Record envelope, standing records and threshold days for Guymon (USC00343835), Oklahoma, United States, with 101 years of record.
Key Facts for Guymon
Guymon (USC00343835) is a weather station in Oklahoma, United States at 36.70 latitude and -101.48 longitude, 936 m (3,070 ft) above sea level.
The station reports from 1909 to 2009, 101 years of record.
1,464 records set at Guymon still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Guymon set a daily record high maximum temperature of 41.1 C (106.0 F) on 15 July 2009.
About the Station
Location: Oklahoma, United States, 36.70 latitude, -101.48 longitude.
Elevation: 936 m (3,070 ft).
Period of record: 1909 to 2009, 101 years.
Eligible elements: tmax, tmin, prcp, snow.
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 Guymon. 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 Guymon, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
28.3 C (82.9 F)
-28.3 C (-18.9 F)
n/a
n/a
Feb
31.1 C (88.0 F)
-23.9 C (-11.0 F)
n/a
n/a
Mar
33.9 C (93.0 F)
-21.7 C (-7.1 F)
n/a
n/a
Apr
35.6 C (96.1 F)
-8.3 C (17.1 F)
n/a
n/a
May
38.9 C (102.0 F)
-2.2 C (28.0 F)
n/a
n/a
Jun
42.8 C (109.0 F)
5.0 C (41.0 F)
n/a
n/a
Jul
42.2 C (108.0 F)
8.9 C (48.0 F)
n/a
n/a
Aug
42.2 C (108.0 F)
7.8 C (46.0 F)
n/a
n/a
Sep
41.1 C (106.0 F)
-0.6 C (30.9 F)
n/a
n/a
Oct
36.7 C (98.1 F)
-5.0 C (23.0 F)
n/a
n/a
Nov
30.0 C (86.0 F)
-15.6 C (3.9 F)
n/a
n/a
Dec
30.0 C (86.0 F)
-22.2 C (-8.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Guymon still stand. 1946 holds the most, with 76.
Standing records at Guymon by the year they were set
Year set
Standing records
1940
43
1941
36
1942
50
1943
60
1944
30
1945
52
1946
76
1947
42
1948
55
1949
35
1950
64
1951
57
1952
66
1953
54
1954
48
1955
47
1956
56
1957
35
1958
47
1959
33
1960
41
1961
44
1962
47
1963
53
1964
47
1965
37
2001
16
2002
22
2003
33
2004
29
2005
28
2006
6
2007
31
2008
28
2009
16
All-Time Record Progression
3 new records
3 all-time records were set at Guymon between 12 July 1963 and 18 August 2008. Each dot is a new record.
When Guymon set new all-time records
Date
Kind
Detail
1963-07-12
Record daily precipitation
Record daily precipitation 92.5 mm (3.6 in)
2008-06-02
Record high maximum temperature
Record high maximum temperature 42.8 C (109.0 F)
2008-08-18
Record daily precipitation
Record daily precipitation 95.5 mm (3.8 in)
Wettest Day of Each Month
Aug: 95.5 mm (3.8 in)
The wettest day on record for each calendar month at Guymon. The most was 95.5 mm (3.8 in) on 18 August 2008.
Record daily precipitation for each month at Guymon
Month
Record daily precipitation (mm)
Date
Jan
52.1 mm (2.1 in)
20 January 2007
Feb
88.9 mm (3.5 in)
25 February 1912
Mar
40.9 mm (1.6 in)
24 March 2007
Apr
63.5 mm (2.5 in)
24 April 1915
May
66.3 mm (2.6 in)
31 May 1942
Jun
75.4 mm (3.0 in)
8 June 1942
Jul
92.5 mm (3.6 in)
12 July 1963
Aug
95.5 mm (3.8 in)
18 August 2008
Sep
61.5 mm (2.4 in)
23 September 1960
Oct
73.7 mm (2.9 in)
22 October 1914
Nov
78.5 mm (3.1 in)
2 November 1911
Dec
40.6 mm (1.6 in)
5 December 1944
Period of Record Coverage
1940 to 2009
Complete yearUnder 90 percent of days
35 years of record at Guymon, 1940 to 2009. 8 years have data for under 90 percent of days and are left out of rankings: 1940, 2001, 2002, 2003, 2004, 2005, 2006, 2009.
Cooler than the station meanWarmer than the station mean
One stripe for each of 25 complete years at Guymon, 1941 to 2008. Blue stripes are years cooler than the station's own mean of 13.6 C (56.5 F); red stripes are warmer. The coolest year was 2007, at 12.6 C (54.7 F), and the warmest was 1954, at 15.0 C (59.1 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Guymon as warming stripes, 1941 to 2008
Year
Annual mean temperature
Difference from the station mean
1941
13.4 C
-0.20 C
1942
13.3 C
-0.27 C
1944
12.9 C
-0.68 C
1945
13.4 C
-0.19 C
1946
14.8 C
+1.18 C
1947
13.5 C
-0.15 C
1948
13.2 C
-0.38 C
1949
13.3 C
-0.34 C
1950
13.5 C
-0.11 C
1951
12.9 C
-0.73 C
1952
13.9 C
+0.25 C
1953
14.8 C
+1.20 C
1954
15.0 C
+1.43 C
1955
14.0 C
+0.38 C
1956
14.6 C
+0.97 C
1957
13.3 C
-0.32 C
1958
13.3 C
-0.32 C
1959
13.2 C
-0.45 C
1960
13.0 C
-0.58 C
1961
13.0 C
-0.60 C
1962
13.9 C
+0.30 C
1963
14.7 C
+1.10 C
1964
13.7 C
+0.04 C
2007
12.6 C
-1.00 C
2008
13.0 C
-0.58 C
This station does not have enough complete years (30 are needed) to fit a temperature trend.
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
1909 to 2009
Yearly extremes at Guymon: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
42.8 C (109.0 F)
2008
40.0 C (104.0 F)
35
Coldest night (TNn)
-28.3 C (-18.9 F)
1959
-17.2 C (1.0 F)
35
Wettest day (Rx1day)
95.5 mm (3.8 in)
2008
53.5 mm (2.1 in)
42
Wettest five days (Rx5day)
142.4 mm (5.6 in)
1946
79.3 mm (3.1 in)
42
Longest dry spell (CDD)
81 days
1954
44 days
42
Hottest day (TXx)
The hottest day of the year at Guymon, 1909 to 2009. The record is 42.8 C (109.0 F) in 2008, marked on the chart; the median year is 40.0 C (104.0 F).
Hottest day (TXx) at Guymon by year
Year
Hottest day (TXx)
1909
n/a
1910
n/a
1911
n/a
1912
n/a
1913
n/a
1914
n/a
1915
n/a
1940
42.2 C (108.0 F)
1941
38.3 C (100.9 F)
1942
37.8 C (100.0 F)
1943
42.2 C (108.0 F)
1944
40.0 C (104.0 F)
1945
41.1 C (106.0 F)
1946
41.1 C (106.0 F)
1947
41.1 C (106.0 F)
1948
40.0 C (104.0 F)
1949
38.3 C (100.9 F)
1950
39.4 C (102.9 F)
1951
40.0 C (104.0 F)
1952
41.1 C (106.0 F)
1953
41.7 C (107.1 F)
1954
41.1 C (106.0 F)
1955
40.0 C (104.0 F)
1956
41.1 C (106.0 F)
1957
41.7 C (107.1 F)
1958
38.9 C (102.0 F)
1959
40.0 C (104.0 F)
1960
42.2 C (108.0 F)
1961
39.4 C (102.9 F)
1962
40.0 C (104.0 F)
1963
39.4 C (102.9 F)
1964
40.0 C (104.0 F)
1965
37.8 C (100.0 F)
2001
38.9 C (102.0 F)
2002
39.4 C (102.9 F)
2003
41.1 C (106.0 F)
2004
39.4 C (102.9 F)
2005
38.9 C (102.0 F)
2006
35.0 C (95.0 F)
2007
40.0 C (104.0 F)
2008
42.8 C (109.0 F)
2009
42.2 C (108.0 F)
Coldest night (TNn)
The coldest night of the year at Guymon, 1909 to 2009. The record is -28.3 C (-18.9 F) in 1959, marked on the chart; the median year is -17.2 C (1.0 F).
Coldest night (TNn) at Guymon by year
Year
Coldest night (TNn)
1909
n/a
1910
n/a
1911
n/a
1912
n/a
1913
n/a
1914
n/a
1915
n/a
1940
-15.6 C (3.9 F)
1941
-13.3 C (8.1 F)
1942
-22.8 C (-9.0 F)
1943
-26.7 C (-16.1 F)
1944
-18.9 C (-2.0 F)
1945
-16.7 C (1.9 F)
1946
-17.2 C (1.0 F)
1947
-24.4 C (-11.9 F)
1948
-22.2 C (-8.0 F)
1949
-20.0 C (-4.0 F)
1950
-21.7 C (-7.1 F)
1951
-23.9 C (-11.0 F)
1952
-15.6 C (3.9 F)
1953
-13.9 C (7.0 F)
1954
-17.2 C (1.0 F)
1955
-15.0 C (5.0 F)
1956
-17.2 C (1.0 F)
1957
-18.3 C (-0.9 F)
1958
-16.7 C (1.9 F)
1959
-28.3 C (-18.9 F)
1960
-20.0 C (-4.0 F)
1961
-20.6 C (-5.1 F)
1962
-21.7 C (-7.1 F)
1963
-25.0 C (-13.0 F)
1964
-17.2 C (1.0 F)
1965
-17.2 C (1.0 F)
2001
-12.8 C (9.0 F)
2002
-18.3 C (-0.9 F)
2003
-16.7 C (1.9 F)
2004
-18.3 C (-0.9 F)
2005
-22.2 C (-8.0 F)
2006
-12.2 C (10.0 F)
2007
-17.2 C (1.0 F)
2008
-15.6 C (3.9 F)
2009
-12.8 C (9.0 F)
Wettest day (Rx1day)
The wettest day of the year at Guymon, 1909 to 2009. The record is 95.5 mm (3.8 in) in 2008, marked on the chart; the median year is 53.5 mm (2.1 in).
Wettest day (Rx1day) at Guymon by year
Year
Wettest day (Rx1day)
1909
53.6 mm (2.1 in)
1910
35.1 mm (1.4 in)
1911
78.5 mm (3.1 in)
1912
88.9 mm (3.5 in)
1913
53.3 mm (2.1 in)
1914
73.7 mm (2.9 in)
1915
63.5 mm (2.5 in)
1940
42.9 mm (1.7 in)
1941
56.9 mm (2.2 in)
1942
75.4 mm (3.0 in)
1943
49.8 mm (2.0 in)
1944
67.8 mm (2.7 in)
1945
22.4 mm (0.9 in)
1946
69.3 mm (2.7 in)
1947
52.3 mm (2.1 in)
1948
42.2 mm (1.7 in)
1949
37.3 mm (1.5 in)
1950
68.3 mm (2.7 in)
1951
54.6 mm (2.1 in)
1952
16.3 mm (0.6 in)
1953
57.9 mm (2.3 in)
1954
37.1 mm (1.5 in)
1955
40.4 mm (1.6 in)
1956
42.7 mm (1.7 in)
1957
78.2 mm (3.1 in)
1958
63.8 mm (2.5 in)
1959
54.1 mm (2.1 in)
1960
61.5 mm (2.4 in)
1961
26.9 mm (1.1 in)
1962
55.9 mm (2.2 in)
1963
92.5 mm (3.6 in)
1964
44.2 mm (1.7 in)
1965
37.1 mm (1.5 in)
2001
20.3 mm (0.8 in)
2002
39.1 mm (1.5 in)
2003
57.2 mm (2.3 in)
2004
41.9 mm (1.6 in)
2005
30.5 mm (1.2 in)
2006
36.8 mm (1.4 in)
2007
62.0 mm (2.4 in)
2008
95.5 mm (3.8 in)
2009
34.5 mm (1.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Guymon, 1909 to 2009. The record is 142.4 mm (5.6 in) in 1946, marked on the chart; the median year is 79.3 mm (3.1 in).
Wettest five days (Rx5day) at Guymon by year
Year
Wettest five days (Rx5day)
1909
108.7 mm (4.3 in)
1910
45.0 mm (1.8 in)
1911
121.9 mm (4.8 in)
1912
108.7 mm (4.3 in)
1913
100.4 mm (4.0 in)
1914
138.5 mm (5.5 in)
1915
86.3 mm (3.4 in)
1940
51.6 mm (2.0 in)
1941
109.2 mm (4.3 in)
1942
122.7 mm (4.8 in)
1943
91.4 mm (3.6 in)
1944
109.5 mm (4.3 in)
1945
39.4 mm (1.6 in)
1946
142.4 mm (5.6 in)
1947
52.1 mm (2.1 in)
1948
94.8 mm (3.7 in)
1949
66.7 mm (2.6 in)
1950
97.5 mm (3.8 in)
1951
131.5 mm (5.2 in)
1952
40.2 mm (1.6 in)
1953
67.6 mm (2.7 in)
1954
63.5 mm (2.5 in)
1955
59.9 mm (2.4 in)
1956
62.0 mm (2.4 in)
1957
80.2 mm (3.2 in)
1958
115.7 mm (4.6 in)
1959
79.4 mm (3.1 in)
1960
77.0 mm (3.0 in)
1961
43.7 mm (1.7 in)
1962
84.5 mm (3.3 in)
1963
99.6 mm (3.9 in)
1964
58.7 mm (2.3 in)
1965
79.2 mm (3.1 in)
2001
28.4 mm (1.1 in)
2002
78.2 mm (3.1 in)
2003
72.1 mm (2.8 in)
2004
62.4 mm (2.5 in)
2005
23.4 mm (0.9 in)
2006
46.0 mm (1.8 in)
2007
86.4 mm (3.4 in)
2008
118.3 mm (4.7 in)
2009
34.5 mm (1.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Guymon, 1909 to 2009. The record is 81 days in 1954, marked on the chart; the median year is 44 days.
Longest dry spell (CDD) at Guymon by year
Year
Longest dry spell (CDD)
1909
23 days
1910
39 days
1911
36 days
1912
56 days
1913
33 days
1914
78 days
1915
31 days
1940
49 days
1941
22 days
1942
44 days
1943
31 days
1944
26 days
1945
39 days
1946
47 days
1947
55 days
1948
47 days
1949
51 days
1950
60 days
1951
51 days
1952
51 days
1953
37 days
1954
81 days
1955
46 days
1956
63 days
1957
45 days
1958
30 days
1959
22 days
1960
25 days
1961
26 days
1962
37 days
1963
43 days
1964
58 days
1965
41 days
2001
51 days
2002
66 days
2003
47 days
2004
30 days
2005
32 days
2006
42 days
2007
54 days
2008
33 days
2009
55 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
25 years with a frost
Across 25 years with a frost, the median last spring frost at Guymon falls on 17 April and the median first autumn frost on 25 October, which leaves a median of 189 days between them.
Fitted over all years, the growing season changes by -0.4 days per decade at this station.
Frost dates and growing season at Guymon
Measure
Median, all years
Earliest period
Recent period (1941 to 2008)
Recent against earliest
Fitted trend
Last spring frost
17 April
n/a
17 April
n/a
+0.3 days per decade
First autumn frost
25 October
n/a
25 October
n/a
-0.1 days per decade
Growing days
189 days
n/a
189 days
n/a
-0.4 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
30 years, 1912 to 2008
A day with at least 54.6 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 104.4 mm (4.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Guymon: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
54.6 mm (2.1 in)
5 years
72.7 mm (2.9 in)
10 years
82.4 mm (3.2 in)
25 years
92.6 mm (3.6 in)
50 years
99.0 mm (3.9 in)
Longer than the 30 years of record
100 years
104.4 mm (4.1 in)
Longer than the 30 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, 30 years of values from 1912 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: 95.5 mm (3.8 in) in 2008; 92.5 mm (3.6 in) in 1963; 88.9 mm (3.5 in) in 1912.
Download the Data
Data for Guymon standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Guymon 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.