Record envelope, standing records and threshold days for Okmulgee Wtr Wks (USC00346670), Oklahoma, United States, with 103 years of record.
Key Facts for Okmulgee Wtr Wks
Okmulgee Wtr Wks (USC00346670) is a weather station in Oklahoma, United States at 35.62 latitude and -96.03 longitude, 197 m (647 ft) above sea level.
The station reports from 1910 to 2012, 103 years of record.
1,464 records set at Okmulgee Wtr Wks still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Okmulgee Wtr Wks set a daily record precipitation of 82.5 mm (3.2 in) on 19 March 2012.
About the Station
Location: Oklahoma, United States, 35.62 latitude, -96.03 longitude.
Elevation: 197 m (647 ft).
Period of record: 1910 to 2012, 103 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 Okmulgee Wtr Wks. 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 Okmulgee Wtr Wks, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
27.8 C (82.0 F)
-27.8 C (-18.0 F)
n/a
n/a
Feb
32.8 C (91.0 F)
-24.4 C (-11.9 F)
n/a
n/a
Mar
35.6 C (96.1 F)
-20.6 C (-5.1 F)
n/a
n/a
Apr
38.3 C (100.9 F)
-6.7 C (19.9 F)
n/a
n/a
May
37.2 C (99.0 F)
1.1 C (34.0 F)
n/a
n/a
Jun
41.7 C (107.1 F)
6.1 C (43.0 F)
n/a
n/a
Jul
45.6 C (114.1 F)
8.3 C (46.9 F)
n/a
n/a
Aug
45.6 C (114.1 F)
7.8 C (46.0 F)
n/a
n/a
Sep
42.8 C (109.0 F)
0.0 C (32.0 F)
n/a
n/a
Oct
36.1 C (97.0 F)
-10.0 C (14.0 F)
n/a
n/a
Nov
31.7 C (89.1 F)
-12.8 C (9.0 F)
n/a
n/a
Dec
27.2 C (81.0 F)
-25.6 C (-14.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Okmulgee Wtr Wks still stand. 1911 holds the most, with 45.
Standing records at Okmulgee Wtr Wks by the year they were set
Year set
Standing records
1910
34
1911
45
1912
17
1913
24
1914
11
1915
27
1916
19
1917
31
1918
37
1919
10
1920
8
1921
13
1922
7
1923
18
1924
18
1925
20
1926
12
1927
21
1928
12
1929
14
1930
16
1931
19
1932
8
1933
13
1934
16
1935
14
1936
43
1937
16
1938
16
1939
14
1940
12
1941
5
1942
4
1943
18
1944
6
1945
7
1946
12
1947
14
1948
18
1949
14
1950
17
1951
16
1952
19
1953
24
1954
25
1955
14
1956
33
1957
15
1958
9
1959
8
1960
13
1961
7
1962
12
1963
18
1964
12
1965
4
1966
27
1967
16
1968
11
1969
6
1970
15
1971
9
1972
19
1973
8
1974
28
1975
11
1976
21
1977
7
1978
13
1979
17
1980
14
1981
17
1982
9
1983
15
1984
11
1985
13
1986
17
1987
8
1988
8
1989
23
1990
9
1991
16
1992
13
1993
14
1994
13
1995
16
1996
20
1997
14
1998
10
1999
4
2000
10
2001
7
2002
5
2009
3
2010
9
2011
29
All-Time Record Progression
10 new records
10 all-time records were set at Okmulgee Wtr Wks between 30 October 1941 and 19 August 2007. Each dot is a new record.
When Okmulgee Wtr Wks set new all-time records
Date
Kind
Detail
1941-10-30
Record daily precipitation
Record daily precipitation 132.8 mm (5.2 in)
1943-05-09
Record daily precipitation
Record daily precipitation 152.9 mm (6.0 in)
1979-11-21
Record daily precipitation
Record daily precipitation 172.7 mm (6.8 in)
1983-10-20
Record daily precipitation
Record daily precipitation 192.5 mm (7.6 in)
1983-12-23
Record low maximum temperature
Record low maximum temperature -12.8 C (9.0 F)
1988-01-06
Record daily snowfall
Record daily snowfall 27.4 cm (10.8 in)
1988-01-08
Record snow depth
Record snow depth 30.5 cm (12.0 in)
1989-03-05
Record daily snowfall
Record daily snowfall 30.5 cm (12.0 in)
1990-12-23
Record low maximum temperature
Record low maximum temperature -13.3 C (8.1 F)
2007-08-19
Record daily precipitation
Record daily precipitation 259.1 mm (10.2 in)
Wettest Day of Each Month
Aug: 259.1 mm (10.2 in)
The wettest day on record for each calendar month at Okmulgee Wtr Wks. The most was 259.1 mm (10.2 in) on 19 August 2007.
Record daily precipitation for each month at Okmulgee Wtr Wks
Month
Record daily precipitation (mm)
Date
Jan
114.6 mm (4.5 in)
31 January 1923
Feb
67.3 mm (2.6 in)
6 February 1999
Mar
99.3 mm (3.9 in)
3 March 2004
Apr
134.6 mm (5.3 in)
14 April 1945
May
152.9 mm (6.0 in)
9 May 1943
Jun
199.4 mm (7.9 in)
1 June 2010
Jul
116.1 mm (4.6 in)
28 July 1988
Aug
259.1 mm (10.2 in)
19 August 2007
Sep
174.5 mm (6.9 in)
14 September 1993
Oct
192.5 mm (7.6 in)
20 October 1983
Nov
172.7 mm (6.8 in)
21 November 1979
Dec
123.4 mm (4.9 in)
23 December 1932
Period of Record Coverage
1910 to 2011
Complete yearUnder 90 percent of days
96 years of record at Okmulgee Wtr Wks, 1910 to 2011. 26 years have data for under 90 percent of days and are left out of rankings: 1910, 1911, 1913, 1914, 1918, 1919, 1920, 1954 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 65 complete years at Okmulgee Wtr Wks, 1912 to 2001. Blue stripes are years cooler than the station's own mean of 15.9 C (60.6 F); red stripes are warmer. The coolest year was 1993, at 14.1 C (57.3 F), and the warmest was 1933, at 17.4 C (63.4 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Okmulgee Wtr Wks as warming stripes, 1912 to 2001
Year
Annual mean temperature
Difference from the station mean
1912
15.9 C
-0.06 C
1915
16.0 C
+0.08 C
1916
16.3 C
+0.39 C
1917
14.5 C
-1.39 C
1922
16.3 C
+0.36 C
1923
16.3 C
+0.39 C
1924
15.0 C
-0.89 C
1925
16.4 C
+0.48 C
1926
16.1 C
+0.16 C
1927
17.2 C
+1.29 C
1929
15.7 C
-0.23 C
1930
15.9 C
+0.02 C
1931
16.9 C
+1.01 C
1932
16.1 C
+0.20 C
1933
17.4 C
+1.52 C
1934
17.1 C
+1.20 C
1935
16.5 C
+0.56 C
1937
15.3 C
-0.57 C
1938
17.2 C
+1.29 C
1939
17.1 C
+1.21 C
1940
15.0 C
-0.91 C
1941
16.5 C
+0.62 C
1942
15.9 C
-0.04 C
1943
16.0 C
+0.06 C
1944
15.8 C
-0.12 C
1945
15.8 C
-0.11 C
1946
17.1 C
+1.22 C
1947
15.6 C
-0.27 C
1948
14.8 C
-1.14 C
1950
15.3 C
-0.63 C
1951
15.6 C
-0.27 C
1952
16.2 C
+0.25 C
1953
16.7 C
+0.80 C
1955
16.5 C
+0.58 C
1957
16.1 C
+0.21 C
1958
15.6 C
-0.32 C
1959
15.6 C
-0.32 C
1960
15.0 C
-0.92 C
1963
16.7 C
+0.80 C
1970
16.2 C
+0.25 C
1971
16.2 C
+0.33 C
1972
16.2 C
+0.26 C
1973
16.5 C
+0.59 C
1974
16.5 C
+0.56 C
1975
15.9 C
+0.01 C
1976
15.3 C
-0.61 C
1977
16.9 C
+1.00 C
1981
16.3 C
+0.36 C
1982
16.1 C
+0.15 C
1983
15.4 C
-0.49 C
1984
16.2 C
+0.30 C
1985
15.9 C
+0.03 C
1987
15.7 C
-0.25 C
1988
15.1 C
-0.78 C
1989
14.3 C
-1.60 C
1991
15.1 C
-0.77 C
1992
14.9 C
-1.06 C
1993
14.1 C
-1.83 C
1994
14.7 C
-1.19 C
1995
14.8 C
-1.15 C
1996
14.2 C
-1.69 C
1997
14.3 C
-1.57 C
1998
17.0 C
+1.13 C
2000
15.9 C
-0.06 C
2001
17.2 C
+1.27 C
The annual mean temperature here has fallen by 0.10 C (0.02 to 0.17) per decade over 1912 to 2001. In Fahrenheit: 0.17 F (0.04 to 0.31) per decade. The slope is a straight line fitted to 65 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Okmulgee Wtr Wks
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.10 C (-0.17 to -0.02) per decade
-0.17 F (-0.31 to -0.04) per decade
1912 to 2001
65
Fall
Mean daily maximum
-0.10 C (-0.19 to -0.01) per decade
-0.17 F (-0.34 to -0.01) per decade
1912 to 2001
65
Fall
Mean daily minimum
-0.10 C (-0.18 to -0.01) per decade
-0.17 F (-0.32 to -0.02) per decade
1912 to 2001
65
Fall
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
1910 to 2012
Yearly extremes at Okmulgee Wtr Wks: 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)
1936
40.0 C (104.0 F)
96
Coldest night (TNn)
-27.8 C (-18.0 F)
1930
-16.1 C (3.0 F)
96
Wettest day (Rx1day)
259.1 mm (10.2 in)
2007
78.5 mm (3.1 in)
103
Wettest five days (Rx5day)
361.9 mm (14.2 in)
1948
119.9 mm (4.7 in)
103
Longest dry spell (CDD)
67 days
1910
26 days
103
Hottest day (TXx)
The hottest day of the year at Okmulgee Wtr Wks, 1910 to 2012. The record is 45.6 C (114.1 F) in 1936, marked on the chart; the median year is 40.0 C (104.0 F).
Hottest day (TXx) at Okmulgee Wtr Wks by year
Year
Hottest day (TXx)
1910
39.4 C (102.9 F)
1911
41.1 C (106.0 F)
1912
40.6 C (105.1 F)
1913
40.6 C (105.1 F)
1914
42.2 C (108.0 F)
1915
40.0 C (104.0 F)
1916
40.0 C (104.0 F)
1917
41.1 C (106.0 F)
1918
42.2 C (108.0 F)
1919
41.7 C (107.1 F)
1920
39.4 C (102.9 F)
1921
40.0 C (104.0 F)
1922
40.0 C (104.0 F)
1923
42.2 C (108.0 F)
1924
39.4 C (102.9 F)
1925
40.6 C (105.1 F)
1926
40.6 C (105.1 F)
1927
37.2 C (99.0 F)
1928
38.9 C (102.0 F)
1929
42.2 C (108.0 F)
1930
42.2 C (108.0 F)
1931
40.0 C (104.0 F)
1932
38.9 C (102.0 F)
1933
42.2 C (108.0 F)
1934
42.8 C (109.0 F)
1935
41.1 C (106.0 F)
1936
45.6 C (114.1 F)
1937
43.9 C (111.0 F)
1938
37.8 C (100.0 F)
1939
41.7 C (107.1 F)
1940
37.2 C (99.0 F)
1941
38.3 C (100.9 F)
1942
36.1 C (97.0 F)
1943
41.1 C (106.0 F)
1944
38.9 C (102.0 F)
1945
38.3 C (100.9 F)
1946
40.6 C (105.1 F)
1947
41.1 C (106.0 F)
1948
37.2 C (99.0 F)
1949
37.2 C (99.0 F)
1950
35.6 C (96.1 F)
1951
41.1 C (106.0 F)
1952
40.6 C (105.1 F)
1953
40.6 C (105.1 F)
1954
43.3 C (109.9 F)
1955
38.3 C (100.9 F)
1956
45.0 C (113.0 F)
1957
40.0 C (104.0 F)
1958
36.7 C (98.1 F)
1959
35.6 C (96.1 F)
1960
37.8 C (100.0 F)
1961
37.2 C (99.0 F)
1962
40.0 C (104.0 F)
1963
41.1 C (106.0 F)
1964
42.2 C (108.0 F)
1965
39.4 C (102.9 F)
1966
37.2 C (99.0 F)
1967
37.2 C (99.0 F)
1968
35.0 C (95.0 F)
1969
40.0 C (104.0 F)
1970
40.6 C (105.1 F)
1971
38.9 C (102.0 F)
1972
39.4 C (102.9 F)
1973
37.8 C (100.0 F)
1974
41.7 C (107.1 F)
1975
36.7 C (98.1 F)
1976
39.4 C (102.9 F)
1977
41.7 C (107.1 F)
1978
40.0 C (104.0 F)
1979
36.7 C (98.1 F)
1980
42.8 C (109.0 F)
1981
38.9 C (102.0 F)
1982
40.6 C (105.1 F)
1983
40.6 C (105.1 F)
1984
41.1 C (106.0 F)
1985
40.6 C (105.1 F)
1986
42.2 C (108.0 F)
1987
38.3 C (100.9 F)
1988
38.3 C (100.9 F)
1989
37.2 C (99.0 F)
1990
39.4 C (102.9 F)
1991
37.2 C (99.0 F)
1992
34.4 C (93.9 F)
1993
40.0 C (104.0 F)
1994
37.8 C (100.0 F)
1995
38.3 C (100.9 F)
1996
41.1 C (106.0 F)
1997
36.7 C (98.1 F)
1998
42.8 C (109.0 F)
1999
41.1 C (106.0 F)
2000
42.2 C (108.0 F)
2001
40.0 C (104.0 F)
2002
35.0 C (95.0 F)
2003
n/a
2004
n/a
2005
n/a
2006
n/a
2007
n/a
2008
n/a
2009
38.3 C (100.9 F)
2010
41.1 C (106.0 F)
2011
45.6 C (114.1 F)
2012
n/a
Coldest night (TNn)
The coldest night of the year at Okmulgee Wtr Wks, 1910 to 2012. The record is -27.8 C (-18.0 F) in 1930, marked on the chart; the median year is -16.1 C (3.0 F).
Coldest night (TNn) at Okmulgee Wtr Wks by year
Year
Coldest night (TNn)
1910
-24.4 C (-11.9 F)
1911
-20.0 C (-4.0 F)
1912
-19.4 C (-2.9 F)
1913
-17.2 C (1.0 F)
1914
-14.4 C (6.1 F)
1915
-13.3 C (8.1 F)
1916
-21.1 C (-6.0 F)
1917
-17.8 C (0.0 F)
1918
-26.1 C (-15.0 F)
1919
-16.1 C (3.0 F)
1920
-10.0 C (14.0 F)
1921
-10.0 C (14.0 F)
1922
-11.7 C (10.9 F)
1923
-12.8 C (9.0 F)
1924
-17.8 C (0.0 F)
1925
-15.0 C (5.0 F)
1926
-20.6 C (-5.1 F)
1927
-16.1 C (3.0 F)
1928
-16.7 C (1.9 F)
1929
-17.8 C (0.0 F)
1930
-27.8 C (-18.0 F)
1931
-11.7 C (10.9 F)
1932
-14.4 C (6.1 F)
1933
-20.6 C (-5.1 F)
1934
-11.1 C (12.0 F)
1935
-16.7 C (1.9 F)
1936
-16.7 C (1.9 F)
1937
-13.3 C (8.1 F)
1938
-12.2 C (10.0 F)
1939
-12.8 C (9.0 F)
1940
-17.8 C (0.0 F)
1941
-8.3 C (17.1 F)
1942
-17.2 C (1.0 F)
1943
-19.4 C (-2.9 F)
1944
-19.4 C (-2.9 F)
1945
-14.4 C (6.1 F)
1946
-12.8 C (9.0 F)
1947
-22.8 C (-9.0 F)
1948
-20.6 C (-5.1 F)
1949
-19.4 C (-2.9 F)
1950
-16.7 C (1.9 F)
1951
-20.6 C (-5.1 F)
1952
-11.1 C (12.0 F)
1953
-12.2 C (10.0 F)
1954
-14.4 C (6.1 F)
1955
-13.3 C (8.1 F)
1956
-14.4 C (6.1 F)
1957
-11.7 C (10.9 F)
1958
-18.3 C (-0.9 F)
1959
-18.3 C (-0.9 F)
1960
-14.4 C (6.1 F)
1961
-15.6 C (3.9 F)
1962
-21.1 C (-6.0 F)
1963
-19.4 C (-2.9 F)
1964
-16.1 C (3.0 F)
1965
-8.9 C (16.0 F)
1966
-16.1 C (3.0 F)
1967
-14.4 C (6.1 F)
1968
-17.8 C (0.0 F)
1969
-16.7 C (1.9 F)
1970
-21.1 C (-6.0 F)
1971
-15.6 C (3.9 F)
1972
-16.1 C (3.0 F)
1973
-20.0 C (-4.0 F)
1974
-13.3 C (8.1 F)
1975
-13.3 C (8.1 F)
1976
-16.1 C (3.0 F)
1977
-23.3 C (-9.9 F)
1978
-18.3 C (-0.9 F)
1979
-21.1 C (-6.0 F)
1980
-15.0 C (5.0 F)
1981
-20.6 C (-5.1 F)
1982
-19.4 C (-2.9 F)
1983
-18.9 C (-2.0 F)
1984
-18.9 C (-2.0 F)
1985
-19.4 C (-2.9 F)
1986
-18.3 C (-0.9 F)
1987
-12.8 C (9.0 F)
1988
-18.3 C (-0.9 F)
1989
-25.6 C (-14.1 F)
1990
-15.0 C (5.0 F)
1991
-15.0 C (5.0 F)
1992
-11.7 C (10.9 F)
1993
-13.3 C (8.1 F)
1994
-12.8 C (9.0 F)
1995
-13.3 C (8.1 F)
1996
-22.2 C (-8.0 F)
1997
-16.1 C (3.0 F)
1998
-11.1 C (12.0 F)
1999
-12.8 C (9.0 F)
2000
-11.7 C (10.9 F)
2001
-12.8 C (9.0 F)
2002
-12.8 C (9.0 F)
2003
n/a
2004
n/a
2005
n/a
2006
n/a
2007
n/a
2008
n/a
2009
-12.8 C (9.0 F)
2010
-17.2 C (1.0 F)
2011
-2.8 C (27.0 F)
2012
n/a
Wettest day (Rx1day)
The wettest day of the year at Okmulgee Wtr Wks, 1910 to 2012. The record is 259.1 mm (10.2 in) in 2007, marked on the chart; the median year is 78.5 mm (3.1 in).
Wettest day (Rx1day) at Okmulgee Wtr Wks by year
Year
Wettest day (Rx1day)
1910
90.2 mm (3.6 in)
1911
89.7 mm (3.5 in)
1912
70.4 mm (2.8 in)
1913
43.9 mm (1.7 in)
1914
94.0 mm (3.7 in)
1915
76.2 mm (3.0 in)
1916
63.5 mm (2.5 in)
1917
68.6 mm (2.7 in)
1918
66.3 mm (2.6 in)
1919
50.3 mm (2.0 in)
1920
50.8 mm (2.0 in)
1921
78.5 mm (3.1 in)
1922
59.9 mm (2.4 in)
1923
123.4 mm (4.9 in)
1924
72.4 mm (2.9 in)
1925
63.5 mm (2.5 in)
1926
91.9 mm (3.6 in)
1927
71.1 mm (2.8 in)
1928
53.3 mm (2.1 in)
1929
62.0 mm (2.4 in)
1930
61.5 mm (2.4 in)
1931
101.6 mm (4.0 in)
1932
123.4 mm (4.9 in)
1933
109.7 mm (4.3 in)
1934
83.8 mm (3.3 in)
1935
109.7 mm (4.3 in)
1936
57.9 mm (2.3 in)
1937
61.5 mm (2.4 in)
1938
62.2 mm (2.4 in)
1939
38.1 mm (1.5 in)
1940
90.2 mm (3.6 in)
1941
132.8 mm (5.2 in)
1942
71.6 mm (2.8 in)
1943
152.9 mm (6.0 in)
1944
77.2 mm (3.0 in)
1945
134.6 mm (5.3 in)
1946
76.2 mm (3.0 in)
1947
72.6 mm (2.9 in)
1948
120.4 mm (4.7 in)
1949
86.4 mm (3.4 in)
1950
140.7 mm (5.5 in)
1951
46.0 mm (1.8 in)
1952
55.6 mm (2.2 in)
1953
93.0 mm (3.7 in)
1954
74.9 mm (2.9 in)
1955
103.1 mm (4.1 in)
1956
39.9 mm (1.6 in)
1957
120.7 mm (4.8 in)
1958
87.9 mm (3.5 in)
1959
108.2 mm (4.3 in)
1960
55.4 mm (2.2 in)
1961
48.8 mm (1.9 in)
1962
71.4 mm (2.8 in)
1963
62.7 mm (2.5 in)
1964
57.4 mm (2.3 in)
1965
50.3 mm (2.0 in)
1966
41.1 mm (1.6 in)
1967
132.1 mm (5.2 in)
1968
88.9 mm (3.5 in)
1969
116.3 mm (4.6 in)
1970
88.9 mm (3.5 in)
1971
111.8 mm (4.4 in)
1972
137.2 mm (5.4 in)
1973
78.7 mm (3.1 in)
1974
127.5 mm (5.0 in)
1975
61.0 mm (2.4 in)
1976
49.8 mm (2.0 in)
1977
81.3 mm (3.2 in)
1978
45.0 mm (1.8 in)
1979
172.7 mm (6.8 in)
1980
53.3 mm (2.1 in)
1981
105.9 mm (4.2 in)
1982
61.0 mm (2.4 in)
1983
192.5 mm (7.6 in)
1984
78.7 mm (3.1 in)
1985
155.4 mm (6.1 in)
1986
82.6 mm (3.3 in)
1987
60.2 mm (2.4 in)
1988
116.1 mm (4.6 in)
1989
64.8 mm (2.6 in)
1990
98.6 mm (3.9 in)
1991
48.3 mm (1.9 in)
1992
88.9 mm (3.5 in)
1993
174.5 mm (6.9 in)
1994
71.1 mm (2.8 in)
1995
62.5 mm (2.5 in)
1996
97.8 mm (3.9 in)
1997
87.6 mm (3.4 in)
1998
84.3 mm (3.3 in)
1999
67.3 mm (2.6 in)
2000
88.9 mm (3.5 in)
2001
72.6 mm (2.9 in)
2002
47.5 mm (1.9 in)
2003
123.4 mm (4.9 in)
2004
99.3 mm (3.9 in)
2005
50.8 mm (2.0 in)
2006
72.4 mm (2.9 in)
2007
259.1 mm (10.2 in)
2008
97.8 mm (3.9 in)
2009
50.8 mm (2.0 in)
2010
199.4 mm (7.9 in)
2011
34.8 mm (1.4 in)
2012
82.5 mm (3.2 in)
Wettest five days (Rx5day)
The wettest five days of the year at Okmulgee Wtr Wks, 1910 to 2012. The record is 361.9 mm (14.2 in) in 1948, marked on the chart; the median year is 119.9 mm (4.7 in).
Wettest five days (Rx5day) at Okmulgee Wtr Wks by year
Year
Wettest five days (Rx5day)
1910
102.4 mm (4.0 in)
1911
96.1 mm (3.8 in)
1912
74.2 mm (2.9 in)
1913
79.5 mm (3.1 in)
1914
94.0 mm (3.7 in)
1915
159.6 mm (6.3 in)
1916
109.3 mm (4.3 in)
1917
100.9 mm (4.0 in)
1918
70.1 mm (2.8 in)
1919
32.8 mm (1.3 in)
1920
81.3 mm (3.2 in)
1921
116.1 mm (4.6 in)
1922
124.7 mm (4.9 in)
1923
223.5 mm (8.8 in)
1924
102.1 mm (4.0 in)
1925
89.6 mm (3.5 in)
1926
157.1 mm (6.2 in)
1927
131.0 mm (5.2 in)
1928
82.8 mm (3.3 in)
1929
159.9 mm (6.3 in)
1930
91.8 mm (3.6 in)
1931
151.1 mm (5.9 in)
1932
145.0 mm (5.7 in)
1933
141.4 mm (5.6 in)
1934
109.4 mm (4.3 in)
1935
166.3 mm (6.5 in)
1936
109.0 mm (4.3 in)
1937
71.4 mm (2.8 in)
1938
151.2 mm (6.0 in)
1939
61.2 mm (2.4 in)
1940
155.5 mm (6.1 in)
1941
180.3 mm (7.1 in)
1942
121.2 mm (4.8 in)
1943
309.9 mm (12.2 in)
1944
152.8 mm (6.0 in)
1945
250.0 mm (9.8 in)
1946
137.5 mm (5.4 in)
1947
133.8 mm (5.3 in)
1948
361.9 mm (14.2 in)
1949
176.8 mm (7.0 in)
1950
265.7 mm (10.5 in)
1951
100.8 mm (4.0 in)
1952
90.2 mm (3.6 in)
1953
93.0 mm (3.7 in)
1954
157.7 mm (6.2 in)
1955
119.9 mm (4.7 in)
1956
59.2 mm (2.3 in)
1957
155.2 mm (6.1 in)
1958
143.3 mm (5.6 in)
1959
182.8 mm (7.2 in)
1960
140.7 mm (5.5 in)
1961
82.8 mm (3.3 in)
1962
107.8 mm (4.2 in)
1963
109.4 mm (4.3 in)
1964
127.8 mm (5.0 in)
1965
76.9 mm (3.0 in)
1966
41.4 mm (1.6 in)
1967
208.3 mm (8.2 in)
1968
140.0 mm (5.5 in)
1969
141.2 mm (5.6 in)
1970
145.5 mm (5.7 in)
1971
123.5 mm (4.9 in)
1972
221.0 mm (8.7 in)
1973
183.0 mm (7.2 in)
1974
237.5 mm (9.4 in)
1975
87.1 mm (3.4 in)
1976
117.1 mm (4.6 in)
1977
94.3 mm (3.7 in)
1978
86.6 mm (3.4 in)
1979
185.9 mm (7.3 in)
1980
114.8 mm (4.5 in)
1981
146.1 mm (5.8 in)
1982
93.3 mm (3.7 in)
1983
292.6 mm (11.5 in)
1984
112.5 mm (4.4 in)
1985
255.0 mm (10.0 in)
1986
197.6 mm (7.8 in)
1987
117.0 mm (4.6 in)
1988
119.7 mm (4.7 in)
1989
89.9 mm (3.5 in)
1990
143.3 mm (5.6 in)
1991
93.7 mm (3.7 in)
1992
140.5 mm (5.5 in)
1993
185.2 mm (7.3 in)
1994
131.6 mm (5.2 in)
1995
109.0 mm (4.3 in)
1996
126.3 mm (5.0 in)
1997
114.8 mm (4.5 in)
1998
154.6 mm (6.1 in)
1999
115.1 mm (4.5 in)
2000
90.9 mm (3.6 in)
2001
169.7 mm (6.7 in)
2002
112.1 mm (4.4 in)
2003
150.1 mm (5.9 in)
2004
88.1 mm (3.5 in)
2005
92.0 mm (3.6 in)
2006
91.8 mm (3.6 in)
2007
106.4 mm (4.2 in)
2008
60.0 mm (2.4 in)
2009
81.2 mm (3.2 in)
2010
238.8 mm (9.4 in)
2011
71.4 mm (2.8 in)
2012
140.1 mm (5.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Okmulgee Wtr Wks, 1910 to 2012. The record is 67 days in 1910, marked on the chart; the median year is 26 days.
Longest dry spell (CDD) at Okmulgee Wtr Wks by year
Year
Longest dry spell (CDD)
1910
67 days
1911
26 days
1912
50 days
1913
31 days
1914
43 days
1915
24 days
1916
28 days
1917
51 days
1918
28 days
1919
26 days
1920
17 days
1921
33 days
1922
20 days
1923
35 days
1924
30 days
1925
27 days
1926
23 days
1927
22 days
1928
23 days
1929
26 days
1930
29 days
1931
32 days
1932
26 days
1933
29 days
1934
31 days
1935
21 days
1936
52 days
1937
20 days
1938
38 days
1939
23 days
1940
17 days
1941
15 days
1942
22 days
1943
33 days
1944
30 days
1945
35 days
1946
24 days
1947
39 days
1948
47 days
1949
27 days
1950
56 days
1951
19 days
1952
42 days
1953
22 days
1954
36 days
1955
30 days
1956
20 days
1957
22 days
1958
15 days
1959
29 days
1960
20 days
1961
23 days
1962
25 days
1963
55 days
1964
28 days
1965
31 days
1966
22 days
1967
26 days
1968
23 days
1969
35 days
1970
30 days
1971
50 days
1972
31 days
1973
19 days
1974
25 days
1975
20 days
1976
19 days
1977
23 days
1978
40 days
1979
31 days
1980
35 days
1981
29 days
1982
19 days
1983
23 days
1984
18 days
1985
27 days
1986
33 days
1987
26 days
1988
28 days
1989
23 days
1990
29 days
1991
30 days
1992
21 days
1993
37 days
1994
22 days
1995
26 days
1996
45 days
1997
22 days
1998
26 days
1999
34 days
2000
39 days
2001
20 days
2002
26 days
2003
18 days
2004
17 days
2005
24 days
2006
19 days
2007
14 days
2008
27 days
2009
26 days
2010
24 days
2011
1 day
2012
9 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
65 years with a frost
Across 65 years with a frost, the median last spring frost at Okmulgee Wtr Wks falls on 1 April and the median first autumn frost on 31 October, which leaves a median of 209 days between them.
In 1958 to 2001 the median growing season was 209 days. That is 3 days fewer than in 1912 to 1950.
Fitted over all years, the growing season changes by +0.2 days per decade at this station.
Frost dates and growing season at Okmulgee Wtr Wks
Measure
Median, all years
Earliest period (1912 to 1950)
Recent period (1958 to 2001)
Recent against earliest
Fitted trend
Last spring frost
1 April
31 March
2 April
2 days later
+0.1 days per decade
First autumn frost
31 October
31 October
31 October
no change
+0.3 days per decade
Growing days
209 days
212 days
209 days
3 days fewer
+0.2 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
80 years, 1910 to 2001
A day with at least 79.2 mm (3.1 in) of rain is expected about once in 2 years. A day with at least 204.9 mm (8.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Okmulgee Wtr Wks: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
79.2 mm (3.1 in)
5 years
108.5 mm (4.3 in)
10 years
129.6 mm (5.1 in)
25 years
158.2 mm (6.2 in)
50 years
180.9 mm (7.1 in)
100 years
204.9 mm (8.1 in)
Longer than the 80 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, 80 years of values from 1910 to 2001.
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: 192.5 mm (7.6 in) in 1983; 174.5 mm (6.9 in) in 1993; 172.7 mm (6.8 in) in 1979.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Okmulgee Wtr Wks standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Okmulgee Wtr Wks 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.