Record envelope, standing records and threshold days for Hanna (USC00343884), Oklahoma, United States, with 61 years of record.
Key Facts for Hanna
Hanna (USC00343884) is a weather station in Oklahoma, United States at 35.20 latitude and -95.89 longitude, 207 m (680 ft) above sea level.
The station reports from 1941 to 2001, 61 years of record.
1,464 records set at Hanna still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Hanna set a daily record precipitation of 41.9 mm (1.6 in) on 17 December 2001.
About the Station
Location: Oklahoma, United States, 35.20 latitude, -95.89 longitude.
Elevation: 207 m (680 ft).
Period of record: 1941 to 2001, 61 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 Hanna. 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 Hanna, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
25.6 C (78.1 F)
-26.1 C (-15.0 F)
n/a
n/a
Feb
32.8 C (91.0 F)
-19.4 C (-2.9 F)
n/a
n/a
Mar
35.6 C (96.1 F)
-15.6 C (3.9 F)
n/a
n/a
Apr
35.0 C (95.0 F)
-5.0 C (23.0 F)
n/a
n/a
May
34.4 C (93.9 F)
1.7 C (35.1 F)
n/a
n/a
Jun
39.4 C (102.9 F)
7.8 C (46.0 F)
n/a
n/a
Jul
42.8 C (109.0 F)
10.0 C (50.0 F)
n/a
n/a
Aug
42.8 C (109.0 F)
10.0 C (50.0 F)
n/a
n/a
Sep
42.8 C (109.0 F)
1.7 C (35.1 F)
n/a
n/a
Oct
36.1 C (97.0 F)
-7.2 C (19.0 F)
n/a
n/a
Nov
29.4 C (84.9 F)
-12.2 C (10.0 F)
n/a
n/a
Dec
27.2 C (81.0 F)
-22.8 C (-9.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Hanna still stand. 1980 holds the most, with 74.
Standing records at Hanna by the year they were set
Year set
Standing records
1960
9
1961
39
1962
33
1963
70
1964
51
1965
46
1966
45
1967
42
1968
31
1969
25
1970
41
1971
32
1972
49
1973
16
1974
44
1975
27
1976
42
1977
22
1978
42
1979
35
1980
74
1981
28
1982
36
1983
44
1984
41
1985
37
1986
31
1987
25
1988
17
1989
53
1990
20
1991
26
1992
21
1993
26
1994
18
1995
31
1996
37
1997
26
1998
44
1999
22
2000
46
2001
20
All-Time Record Progression
2 new records
2 all-time records were set at Hanna between 3 May 1990 and 3 August 1998. Each dot is a new record.
When Hanna set new all-time records
Date
Kind
Detail
1990-05-03
Record daily precipitation
Record daily precipitation 204.2 mm (8.0 in)
1998-08-03
Record high minimum temperature
Record high minimum temperature 28.3 C (82.9 F)
Wettest Day of Each Month
May: 204.2 mm (8.0 in)
The wettest day on record for each calendar month at Hanna. The most was 204.2 mm (8.0 in) on 3 May 1990.
Record daily precipitation for each month at Hanna
Month
Record daily precipitation (mm)
Date
Jan
68.6 mm (2.7 in)
29 January 2001
Feb
71.1 mm (2.8 in)
1 February 1983
Mar
114.8 mm (4.5 in)
27 March 1977
Apr
119.4 mm (4.7 in)
30 April 1974
May
204.2 mm (8.0 in)
3 May 1990
Jun
135.4 mm (5.3 in)
17 June 1964
Jul
99.1 mm (3.9 in)
26 July 1959
Aug
137.9 mm (5.4 in)
18 August 1997
Sep
192.3 mm (7.6 in)
14 September 1993
Oct
122.2 mm (4.8 in)
14 October 1981
Nov
104.4 mm (4.1 in)
16 November 1991
Dec
72.4 mm (2.9 in)
26 December 1942
Period of Record Coverage
1960 to 2001
Complete yearUnder 90 percent of days
42 years of record at Hanna, 1960 to 2001. 2 years have data for under 90 percent of days and are left out of rankings: 1960, 2001.
Cooler than the station meanWarmer than the station mean
One stripe for each of 37 complete years at Hanna, 1961 to 1997. Blue stripes are years cooler than the station's own mean of 16.2 C (61.1 F); red stripes are warmer. The coolest year was 1979, at 15.3 C (59.5 F), and the warmest was 1980, at 17.0 C (62.6 F). The strongest colour marks a difference of 1.0 C (1.8 F).
Annual mean temperature at Hanna as warming stripes, 1961 to 1997
Year
Annual mean temperature
Difference from the station mean
1961
15.6 C
-0.60 C
1962
16.3 C
+0.15 C
1963
16.7 C
+0.52 C
1964
16.6 C
+0.42 C
1965
16.8 C
+0.64 C
1966
15.7 C
-0.48 C
1967
16.3 C
+0.15 C
1968
15.7 C
-0.49 C
1969
16.2 C
+0.04 C
1970
16.1 C
-0.07 C
1971
16.3 C
+0.08 C
1972
16.3 C
+0.12 C
1973
16.4 C
+0.22 C
1974
16.6 C
+0.43 C
1975
16.1 C
-0.12 C
1976
15.9 C
-0.32 C
1977
16.8 C
+0.62 C
1978
15.7 C
-0.49 C
1979
15.3 C
-0.93 C
1980
17.0 C
+0.82 C
1981
16.7 C
+0.50 C
1982
16.3 C
+0.12 C
1983
16.0 C
-0.21 C
1984
16.8 C
+0.56 C
1985
16.3 C
+0.08 C
1986
16.7 C
+0.50 C
1987
16.4 C
+0.18 C
1988
16.0 C
-0.17 C
1989
15.3 C
-0.91 C
1990
16.9 C
+0.71 C
1991
16.5 C
+0.28 C
1992
15.9 C
-0.25 C
1993
15.5 C
-0.66 C
1994
16.1 C
-0.09 C
1995
16.1 C
-0.06 C
1996
15.7 C
-0.49 C
1997
15.5 C
-0.65 C
The fitted trend in annual mean temperature here over 1961 to 1997 is -0.1 C (-0.2 to 0.1) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.4 to 0.1) per decade. The slope is a straight line fitted to 37 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Hanna
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.1 C (-0.2 to 0.1) per decade
-0.1 F (-0.4 to 0.1) per decade
1961 to 1997
37
Not clearly different from zero
Mean daily maximum
-0.19 C (-0.37 to -0.02) per decade
-0.35 F (-0.67 to -0.03) per decade
1961 to 1997
37
Fall
Mean daily minimum
0.03 C (-0.13 to 0.20) per decade
0.1 F (-0.2 to 0.4) per decade
1961 to 1997
37
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
1941 to 2001
Yearly extremes at Hanna: 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)
1964
39.2 C (102.5 F)
42
Coldest night (TNn)
-26.1 C (-15.0 F)
1977
-15.0 C (5.0 F)
42
Wettest day (Rx1day)
204.2 mm (8.0 in)
1990
80.8 mm (3.2 in)
56
Wettest five days (Rx5day)
271.2 mm (10.7 in)
1990
136.0 mm (5.4 in)
56
Longest dry spell (CDD)
57 days
1980
25 days
56
Hottest day (TXx)
The hottest day of the year at Hanna, 1941 to 2001. The record is 42.8 C (109.0 F) in 1964, marked on the chart; the median year is 39.2 C (102.5 F).
Hottest day (TXx) at Hanna by year
Year
Hottest day (TXx)
1941
n/a
1942
n/a
1947
n/a
1949
n/a
1950
n/a
1951
n/a
1952
n/a
1953
n/a
1954
n/a
1955
n/a
1956
n/a
1957
n/a
1958
n/a
1959
n/a
1960
32.2 C (90.0 F)
1961
37.2 C (99.0 F)
1962
40.0 C (104.0 F)
1963
41.1 C (106.0 F)
1964
42.8 C (109.0 F)
1965
39.4 C (102.9 F)
1966
40.6 C (105.1 F)
1967
38.9 C (102.0 F)
1968
37.2 C (99.0 F)
1969
40.6 C (105.1 F)
1970
41.1 C (106.0 F)
1971
38.3 C (100.9 F)
1972
39.4 C (102.9 F)
1973
36.7 C (98.1 F)
1974
41.7 C (107.1 F)
1975
37.2 C (99.0 F)
1976
38.9 C (102.0 F)
1977
41.1 C (106.0 F)
1978
38.9 C (102.0 F)
1979
36.1 C (97.0 F)
1980
42.2 C (108.0 F)
1981
39.4 C (102.9 F)
1982
38.9 C (102.0 F)
1983
40.6 C (105.1 F)
1984
42.2 C (108.0 F)
1985
40.6 C (105.1 F)
1986
42.8 C (109.0 F)
1987
37.8 C (100.0 F)
1988
37.8 C (100.0 F)
1989
37.8 C (100.0 F)
1990
38.3 C (100.9 F)
1991
36.7 C (98.1 F)
1992
34.4 C (93.9 F)
1993
40.0 C (104.0 F)
1994
37.8 C (100.0 F)
1995
38.9 C (102.0 F)
1996
40.0 C (104.0 F)
1997
37.2 C (99.0 F)
1998
42.8 C (109.0 F)
1999
40.6 C (105.1 F)
2000
42.8 C (109.0 F)
2001
38.3 C (100.9 F)
Coldest night (TNn)
The coldest night of the year at Hanna, 1941 to 2001. The record is -26.1 C (-15.0 F) in 1977, marked on the chart; the median year is -15.0 C (5.0 F).
Coldest night (TNn) at Hanna by year
Year
Coldest night (TNn)
1941
n/a
1942
n/a
1947
n/a
1949
n/a
1950
n/a
1951
n/a
1952
n/a
1953
n/a
1954
n/a
1955
n/a
1956
n/a
1957
n/a
1958
n/a
1959
n/a
1960
-10.0 C (14.0 F)
1961
-13.9 C (7.0 F)
1962
-21.7 C (-7.1 F)
1963
-20.0 C (-4.0 F)
1964
-16.1 C (3.0 F)
1965
-11.7 C (10.9 F)
1966
-19.4 C (-2.9 F)
1967
-12.8 C (9.0 F)
1968
-16.1 C (3.0 F)
1969
-16.1 C (3.0 F)
1970
-18.9 C (-2.0 F)
1971
-16.7 C (1.9 F)
1972
-14.4 C (6.1 F)
1973
-13.3 C (8.1 F)
1974
-12.2 C (10.0 F)
1975
-12.2 C (10.0 F)
1976
-15.0 C (5.0 F)
1977
-26.1 C (-15.0 F)
1978
-18.3 C (-0.9 F)
1979
-18.3 C (-0.9 F)
1980
-12.2 C (10.0 F)
1981
-16.1 C (3.0 F)
1982
-16.7 C (1.9 F)
1983
-18.9 C (-2.0 F)
1984
-17.8 C (0.0 F)
1985
-19.4 C (-2.9 F)
1986
-15.6 C (3.9 F)
1987
-8.3 C (17.1 F)
1988
-22.2 C (-8.0 F)
1989
-22.8 C (-9.0 F)
1990
-15.0 C (5.0 F)
1991
-9.4 C (15.1 F)
1992
-11.7 C (10.9 F)
1993
-12.8 C (9.0 F)
1994
-12.2 C (10.0 F)
1995
-12.8 C (9.0 F)
1996
-18.3 C (-0.9 F)
1997
-14.4 C (6.1 F)
1998
-12.2 C (10.0 F)
1999
-13.3 C (8.1 F)
2000
-12.2 C (10.0 F)
2001
-13.3 C (8.1 F)
Wettest day (Rx1day)
The wettest day of the year at Hanna, 1941 to 2001. The record is 204.2 mm (8.0 in) in 1990, marked on the chart; the median year is 80.8 mm (3.2 in).
Wettest day (Rx1day) at Hanna by year
Year
Wettest day (Rx1day)
1941
120.7 mm (4.8 in)
1942
72.4 mm (2.9 in)
1947
10.2 mm (0.4 in)
1949
90.4 mm (3.6 in)
1950
74.4 mm (2.9 in)
1951
49.0 mm (1.9 in)
1952
63.0 mm (2.5 in)
1953
78.7 mm (3.1 in)
1954
91.7 mm (3.6 in)
1955
60.7 mm (2.4 in)
1956
61.5 mm (2.4 in)
1957
77.2 mm (3.0 in)
1958
80.5 mm (3.2 in)
1959
99.1 mm (3.9 in)
1960
94.2 mm (3.7 in)
1961
79.0 mm (3.1 in)
1962
88.9 mm (3.5 in)
1963
69.9 mm (2.8 in)
1964
135.4 mm (5.3 in)
1965
64.3 mm (2.5 in)
1966
52.1 mm (2.1 in)
1967
80.8 mm (3.2 in)
1968
93.7 mm (3.7 in)
1969
73.9 mm (2.9 in)
1970
80.8 mm (3.2 in)
1971
84.6 mm (3.3 in)
1972
86.4 mm (3.4 in)
1973
89.9 mm (3.5 in)
1974
119.4 mm (4.7 in)
1975
70.9 mm (2.8 in)
1976
79.0 mm (3.1 in)
1977
114.8 mm (4.5 in)
1978
51.8 mm (2.0 in)
1979
96.5 mm (3.8 in)
1980
49.5 mm (1.9 in)
1981
122.2 mm (4.8 in)
1982
82.8 mm (3.3 in)
1983
89.2 mm (3.5 in)
1984
51.8 mm (2.0 in)
1985
84.3 mm (3.3 in)
1986
83.8 mm (3.3 in)
1987
84.3 mm (3.3 in)
1988
66.5 mm (2.6 in)
1989
101.9 mm (4.0 in)
1990
204.2 mm (8.0 in)
1991
104.4 mm (4.1 in)
1992
91.7 mm (3.6 in)
1993
192.3 mm (7.6 in)
1994
97.5 mm (3.8 in)
1995
76.7 mm (3.0 in)
1996
61.7 mm (2.4 in)
1997
137.9 mm (5.4 in)
1998
69.1 mm (2.7 in)
1999
46.5 mm (1.8 in)
2000
62.2 mm (2.4 in)
2001
80.0 mm (3.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Hanna, 1941 to 2001. The record is 271.2 mm (10.7 in) in 1990, marked on the chart; the median year is 136.0 mm (5.4 in).
Wettest five days (Rx5day) at Hanna by year
Year
Wettest five days (Rx5day)
1941
148.6 mm (5.9 in)
1942
144.7 mm (5.7 in)
1947
22.4 mm (0.9 in)
1949
113.8 mm (4.5 in)
1950
160.6 mm (6.3 in)
1951
135.3 mm (5.3 in)
1952
88.3 mm (3.5 in)
1953
121.1 mm (4.8 in)
1954
249.2 mm (9.8 in)
1955
86.6 mm (3.4 in)
1956
85.6 mm (3.4 in)
1957
114.3 mm (4.5 in)
1958
159.5 mm (6.3 in)
1959
208.8 mm (8.2 in)
1960
145.8 mm (5.7 in)
1961
114.0 mm (4.5 in)
1962
108.7 mm (4.3 in)
1963
139.2 mm (5.5 in)
1964
142.0 mm (5.6 in)
1965
107.9 mm (4.2 in)
1966
108.4 mm (4.3 in)
1967
196.6 mm (7.7 in)
1968
143.5 mm (5.6 in)
1969
180.3 mm (7.1 in)
1970
109.0 mm (4.3 in)
1971
145.9 mm (5.7 in)
1972
146.5 mm (5.8 in)
1973
156.6 mm (6.2 in)
1974
140.7 mm (5.5 in)
1975
95.3 mm (3.8 in)
1976
145.7 mm (5.7 in)
1977
130.5 mm (5.1 in)
1978
68.7 mm (2.7 in)
1979
150.1 mm (5.9 in)
1980
75.9 mm (3.0 in)
1981
206.4 mm (8.1 in)
1982
132.8 mm (5.2 in)
1983
116.7 mm (4.6 in)
1984
115.1 mm (4.5 in)
1985
112.0 mm (4.4 in)
1986
106.1 mm (4.2 in)
1987
133.9 mm (5.3 in)
1988
95.5 mm (3.8 in)
1989
183.7 mm (7.2 in)
1990
271.2 mm (10.7 in)
1991
228.4 mm (9.0 in)
1992
136.7 mm (5.4 in)
1993
193.9 mm (7.6 in)
1994
117.3 mm (4.6 in)
1995
114.5 mm (4.5 in)
1996
159.3 mm (6.3 in)
1997
168.9 mm (6.6 in)
1998
158.2 mm (6.2 in)
1999
88.9 mm (3.5 in)
2000
117.3 mm (4.6 in)
2001
169.7 mm (6.7 in)
Longest dry spell (CDD)
The longest dry spell of the year at Hanna, 1941 to 2001. The record is 57 days in 1980, marked on the chart; the median year is 25 days.
Longest dry spell (CDD) at Hanna by year
Year
Longest dry spell (CDD)
1941
14 days
1942
25 days
1947
14 days
1949
26 days
1950
29 days
1951
25 days
1952
27 days
1953
22 days
1954
37 days
1955
43 days
1956
24 days
1957
29 days
1958
20 days
1959
35 days
1960
21 days
1961
21 days
1962
19 days
1963
49 days
1964
23 days
1965
34 days
1966
29 days
1967
25 days
1968
17 days
1969
26 days
1970
37 days
1971
21 days
1972
29 days
1973
19 days
1974
22 days
1975
14 days
1976
31 days
1977
24 days
1978
17 days
1979
25 days
1980
57 days
1981
20 days
1982
20 days
1983
19 days
1984
21 days
1985
18 days
1986
27 days
1987
20 days
1988
14 days
1989
22 days
1990
26 days
1991
28 days
1992
21 days
1993
21 days
1994
17 days
1995
30 days
1996
32 days
1997
25 days
1998
30 days
1999
33 days
2000
56 days
2001
21 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
37 years with a frost
Across 37 years with a frost, the median last spring frost at Hanna falls on 3 April and the median first autumn frost on 1 November, which leaves a median of 212 days between them.
Fitted over all years, the growing season changes by -0.5 days per decade at this station.
Frost dates and growing season at Hanna
Measure
Median, all years
Earliest period
Recent period (1968 to 1997)
Recent against earliest
Fitted trend
Last spring frost
3 April
n/a
4 April
n/a
-0.1 days per decade
First autumn frost
1 November
n/a
1 November
n/a
-0.6 days per decade
Growing days
212 days
n/a
210 days
n/a
-0.5 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
52 years, 1942 to 2001
A day with at least 79.4 mm (3.1 in) of rain is expected about once in 2 years. A day with at least 194.2 mm (7.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Hanna: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
79.4 mm (3.1 in)
5 years
104.0 mm (4.1 in)
10 years
122.5 mm (4.8 in)
25 years
148.7 mm (5.9 in)
50 years
170.5 mm (6.7 in)
100 years
194.2 mm (7.6 in)
Longer than the 52 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, 52 years of values from 1942 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: 204.2 mm (8.0 in) in 1990; 192.3 mm (7.6 in) in 1993; 137.9 mm (5.4 in) in 1997.
Download the Data
Data for Hanna standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Hanna 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.