Record envelope, standing records and threshold days for Denison Dam (USC00412394), Texas, United States, with 58 years of record.
Key Facts for Denison Dam
Denison Dam (USC00412394) is a weather station in Texas, United States at 33.82 latitude and -96.57 longitude, 187 m (613 ft) above sea level.
The station reports from 1940 to 1997, 58 years of record.
1,464 records set at Denison Dam still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Denison Dam set a daily record precipitation of 33.5 mm (1.3 in) on 24 May 1997.
About the Station
Location: Texas, United States, 33.82 latitude, -96.57 longitude.
Elevation: 187 m (613 ft).
Period of record: 1940 to 1997, 58 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 Denison Dam. 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 Denison Dam, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
29.4 C (84.9 F)
-16.1 C (3.0 F)
n/a
n/a
Feb
33.3 C (91.9 F)
-16.7 C (1.9 F)
n/a
n/a
Mar
34.4 C (93.9 F)
-13.9 C (7.0 F)
n/a
n/a
Apr
36.7 C (98.1 F)
-3.9 C (25.0 F)
n/a
n/a
May
37.2 C (99.0 F)
3.3 C (37.9 F)
n/a
n/a
Jun
42.8 C (109.0 F)
8.3 C (46.9 F)
n/a
n/a
Jul
42.2 C (108.0 F)
13.3 C (55.9 F)
n/a
n/a
Aug
42.8 C (109.0 F)
10.6 C (51.1 F)
n/a
n/a
Sep
41.7 C (107.1 F)
3.9 C (39.0 F)
n/a
n/a
Oct
36.7 C (98.1 F)
-4.4 C (24.1 F)
n/a
n/a
Nov
32.8 C (91.0 F)
-9.4 C (15.1 F)
n/a
n/a
Dec
30.0 C (86.0 F)
-19.4 C (-2.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Denison Dam still stand. 1951 holds the most, with 51.
Standing records at Denison Dam by the year they were set
Year set
Standing records
1940
27
1941
15
1942
28
1943
42
1944
20
1945
30
1946
21
1947
10
1948
37
1949
16
1950
38
1951
51
1952
50
1953
49
1954
38
1955
28
1956
38
1957
21
1958
24
1959
21
1960
15
1961
26
1962
17
1963
29
1964
22
1965
40
1966
22
1967
22
1968
17
1969
12
1970
25
1971
24
1972
22
1973
12
1974
31
1975
22
1976
34
1977
16
1978
32
1979
20
1980
42
1981
9
1982
19
1983
32
1984
15
1985
30
1986
33
1987
10
1988
14
1989
47
1990
18
1991
24
1992
19
1993
17
1994
16
1995
18
1996
25
1997
12
All-Time Record Progression
7 new records
7 all-time records were set at Denison Dam between 31 October 1974 and 23 December 1989. Each dot is a new record.
When Denison Dam set new all-time records
Date
Kind
Detail
1974-10-31
Record daily precipitation
Record daily precipitation 139.7 mm (5.5 in)
1977-01-10
Record low maximum temperature
Record low maximum temperature -10.6 C (12.9 F)
1977-03-27
Record daily precipitation
Record daily precipitation 176.3 mm (6.9 in)
1978-02-09
Record snow depth
Record snow depth 17.8 cm (7.0 in)
1983-12-25
Record low maximum temperature
Record low maximum temperature -12.8 C (9.0 F)
1989-12-22
Record low minimum temperature
Record low minimum temperature -17.2 C (1.0 F)
1989-12-23
Record low minimum temperature
Record low minimum temperature -19.4 C (-2.9 F)
Wettest Day of Each Month
Mar: 176.3 mm (6.9 in)
The wettest day on record for each calendar month at Denison Dam. The most was 176.3 mm (6.9 in) on 27 March 1977.
Record daily precipitation for each month at Denison Dam
Month
Record daily precipitation (mm)
Date
Jan
51.1 mm (2.0 in)
17 January 1990
Feb
82.0 mm (3.2 in)
12 February 1950
Mar
176.3 mm (6.9 in)
27 March 1977
Apr
166.9 mm (6.6 in)
26 April 1990
May
168.1 mm (6.6 in)
10 May 1993
Jun
139.7 mm (5.5 in)
6 June 1985
Jul
169.4 mm (6.7 in)
11 July 1994
Aug
134.1 mm (5.3 in)
26 August 1946
Sep
135.1 mm (5.3 in)
16 September 1964
Oct
139.7 mm (5.5 in)
31 October 1974
Nov
170.2 mm (6.7 in)
2 November 1982
Dec
68.6 mm (2.7 in)
14 December 1992
Period of Record Coverage
1940 to 1997
Complete yearUnder 90 percent of days
58 years of record at Denison Dam, 1940 to 1997. 4 years have data for under 90 percent of days and are left out of rankings: 1940, 1945, 1947, 1997.
Cooler than the station meanWarmer than the station mean
One stripe for each of 52 complete years at Denison Dam, 1941 to 1996. Blue stripes are years cooler than the station's own mean of 17.3 C (63.2 F); red stripes are warmer. The coolest year was 1989, at 15.8 C (60.4 F), and the warmest was 1954, at 18.8 C (65.8 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at Denison Dam as warming stripes, 1941 to 1996
Year
Annual mean temperature
Difference from the station mean
1941
17.7 C
+0.40 C
1942
17.2 C
-0.15 C
1943
17.7 C
+0.38 C
1944
18.0 C
+0.64 C
1946
18.6 C
+1.27 C
1948
17.5 C
+0.15 C
1949
17.0 C
-0.28 C
1950
17.5 C
+0.16 C
1951
18.0 C
+0.69 C
1952
17.8 C
+0.50 C
1953
18.0 C
+0.68 C
1954
18.8 C
+1.48 C
1955
17.8 C
+0.49 C
1956
18.7 C
+1.40 C
1957
17.2 C
-0.09 C
1958
16.9 C
-0.42 C
1959
16.7 C
-0.62 C
1960
16.8 C
-0.49 C
1961
16.7 C
-0.62 C
1962
17.3 C
-0.01 C
1963
17.8 C
+0.47 C
1964
17.4 C
+0.13 C
1965
18.5 C
+1.19 C
1966
17.5 C
+0.15 C
1967
18.2 C
+0.91 C
1968
17.3 C
-0.03 C
1969
17.8 C
+0.46 C
1970
17.7 C
+0.40 C
1971
18.2 C
+0.87 C
1972
17.3 C
-0.02 C
1973
16.8 C
-0.52 C
1974
16.8 C
-0.48 C
1975
16.5 C
-0.83 C
1976
16.1 C
-1.17 C
1977
17.3 C
+0.02 C
1978
16.6 C
-0.74 C
1979
16.0 C
-1.35 C
1980
17.7 C
+0.40 C
1981
17.3 C
0.00 C
1982
16.9 C
-0.45 C
1983
16.1 C
-1.23 C
1984
17.0 C
-0.32 C
1985
17.2 C
-0.15 C
1986
18.1 C
+0.74 C
1988
16.5 C
-0.77 C
1989
15.8 C
-1.52 C
1990
17.9 C
+0.60 C
1991
17.3 C
-0.05 C
1992
17.0 C
-0.35 C
1993
16.4 C
-0.96 C
1994
16.8 C
-0.47 C
1996
16.9 C
-0.42 C
The annual mean temperature here has fallen by 0.2 C (0.1 to 0.3) per decade over 1941 to 1996. In Fahrenheit: 0.4 F (0.2 to 0.6) per decade. The slope is a straight line fitted to 52 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Denison Dam
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.2 C (-0.3 to -0.1) per decade
-0.4 F (-0.6 to -0.2) per decade
1941 to 1996
52
Fall
Mean daily maximum
-0.3 C (-0.5 to -0.2) per decade
-0.6 F (-0.8 to -0.3) per decade
1941 to 1996
52
Fall
Mean daily minimum
-0.11 C (-0.22 to 0.01) per decade
-0.19 F (-0.40 to 0.02) per decade
1941 to 1996
52
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
1940 to 1997
Yearly extremes at Denison Dam: 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)
1943
39.4 C (102.9 F)
58
Coldest night (TNn)
-19.4 C (-2.9 F)
1989
-11.9 C (10.5 F)
58
Wettest day (Rx1day)
176.3 mm (6.9 in)
1977
85.6 mm (3.4 in)
58
Wettest five days (Rx5day)
250.0 mm (9.8 in)
1946
130.2 mm (5.1 in)
58
Longest dry spell (CDD)
64 days
1955
28 days
58
Hottest day (TXx)
The hottest day of the year at Denison Dam, 1940 to 1997. The record is 42.8 C (109.0 F) in 1943, marked on the chart; the median year is 39.4 C (102.9 F).
Hottest day (TXx) at Denison Dam by year
Year
Hottest day (TXx)
1940
37.8 C (100.0 F)
1941
40.0 C (104.0 F)
1942
38.3 C (100.9 F)
1943
42.8 C (109.0 F)
1944
40.6 C (105.1 F)
1945
39.4 C (102.9 F)
1946
40.6 C (105.1 F)
1947
40.6 C (105.1 F)
1948
40.0 C (104.0 F)
1949
38.9 C (102.0 F)
1950
37.2 C (99.0 F)
1951
42.8 C (109.0 F)
1952
40.6 C (105.1 F)
1953
40.6 C (105.1 F)
1954
41.7 C (107.1 F)
1955
38.3 C (100.9 F)
1956
42.8 C (109.0 F)
1957
39.4 C (102.9 F)
1958
39.4 C (102.9 F)
1959
37.2 C (99.0 F)
1960
38.3 C (100.9 F)
1961
37.8 C (100.0 F)
1962
40.0 C (104.0 F)
1963
40.0 C (104.0 F)
1964
42.2 C (108.0 F)
1965
38.3 C (100.9 F)
1966
38.9 C (102.0 F)
1967
39.4 C (102.9 F)
1968
37.8 C (100.0 F)
1969
38.9 C (102.0 F)
1970
40.6 C (105.1 F)
1971
40.0 C (104.0 F)
1972
39.4 C (102.9 F)
1973
36.7 C (98.1 F)
1974
40.6 C (105.1 F)
1975
36.7 C (98.1 F)
1976
37.8 C (100.0 F)
1977
37.8 C (100.0 F)
1978
40.6 C (105.1 F)
1979
37.8 C (100.0 F)
1980
42.8 C (109.0 F)
1981
39.4 C (102.9 F)
1982
38.3 C (100.9 F)
1983
38.9 C (102.0 F)
1984
40.0 C (104.0 F)
1985
41.1 C (106.0 F)
1986
42.2 C (108.0 F)
1987
39.4 C (102.9 F)
1988
40.6 C (105.1 F)
1989
37.8 C (100.0 F)
1990
39.4 C (102.9 F)
1991
36.7 C (98.1 F)
1992
35.0 C (95.0 F)
1993
38.9 C (102.0 F)
1994
37.2 C (99.0 F)
1995
39.4 C (102.9 F)
1996
41.1 C (106.0 F)
1997
33.3 C (91.9 F)
Coldest night (TNn)
The coldest night of the year at Denison Dam, 1940 to 1997. The record is -19.4 C (-2.9 F) in 1989, marked on the chart; the median year is -11.9 C (10.5 F).
Coldest night (TNn) at Denison Dam by year
Year
Coldest night (TNn)
1940
-9.4 C (15.1 F)
1941
-5.6 C (21.9 F)
1942
-15.6 C (3.9 F)
1943
-16.1 C (3.0 F)
1944
-12.2 C (10.0 F)
1945
-10.0 C (14.0 F)
1946
-9.4 C (15.1 F)
1947
-15.0 C (5.0 F)
1948
-13.9 C (7.0 F)
1949
-15.6 C (3.9 F)
1950
-14.4 C (6.1 F)
1951
-16.7 C (1.9 F)
1952
-6.1 C (21.0 F)
1953
-10.6 C (12.9 F)
1954
-12.2 C (10.0 F)
1955
-9.4 C (15.1 F)
1956
-6.1 C (21.0 F)
1957
-10.0 C (14.0 F)
1958
-11.7 C (10.9 F)
1959
-14.4 C (6.1 F)
1960
-8.3 C (17.1 F)
1961
-10.0 C (14.0 F)
1962
-15.0 C (5.0 F)
1963
-16.1 C (3.0 F)
1964
-15.6 C (3.9 F)
1965
-9.4 C (15.1 F)
1966
-14.4 C (6.1 F)
1967
-8.9 C (16.0 F)
1968
-13.3 C (8.1 F)
1969
-9.4 C (15.1 F)
1970
-11.1 C (12.0 F)
1971
-11.1 C (12.0 F)
1972
-12.8 C (9.0 F)
1973
-11.1 C (12.0 F)
1974
-11.1 C (12.0 F)
1975
-9.4 C (15.1 F)
1976
-13.9 C (7.0 F)
1977
-13.9 C (7.0 F)
1978
-14.4 C (6.1 F)
1979
-13.3 C (8.1 F)
1980
-9.4 C (15.1 F)
1981
-13.3 C (8.1 F)
1982
-15.0 C (5.0 F)
1983
-16.7 C (1.9 F)
1984
-13.3 C (8.1 F)
1985
-15.6 C (3.9 F)
1986
-7.8 C (18.0 F)
1987
-6.7 C (19.9 F)
1988
-12.8 C (9.0 F)
1989
-19.4 C (-2.9 F)
1990
-12.2 C (10.0 F)
1991
-11.1 C (12.0 F)
1992
-8.9 C (16.0 F)
1993
-8.9 C (16.0 F)
1994
-9.4 C (15.1 F)
1995
-10.0 C (14.0 F)
1996
-14.4 C (6.1 F)
1997
-11.1 C (12.0 F)
Wettest day (Rx1day)
The wettest day of the year at Denison Dam, 1940 to 1997. The record is 176.3 mm (6.9 in) in 1977, marked on the chart; the median year is 85.6 mm (3.4 in).
Wettest day (Rx1day) at Denison Dam by year
Year
Wettest day (Rx1day)
1940
58.4 mm (2.3 in)
1941
97.8 mm (3.9 in)
1942
80.0 mm (3.1 in)
1943
94.0 mm (3.7 in)
1944
57.2 mm (2.3 in)
1945
105.4 mm (4.1 in)
1946
134.1 mm (5.3 in)
1947
29.7 mm (1.2 in)
1948
133.4 mm (5.3 in)
1949
85.6 mm (3.4 in)
1950
82.0 mm (3.2 in)
1951
47.0 mm (1.9 in)
1952
54.6 mm (2.1 in)
1953
66.5 mm (2.6 in)
1954
91.4 mm (3.6 in)
1955
66.5 mm (2.6 in)
1956
57.2 mm (2.3 in)
1957
116.6 mm (4.6 in)
1958
77.0 mm (3.0 in)
1959
98.0 mm (3.9 in)
1960
76.2 mm (3.0 in)
1961
91.2 mm (3.6 in)
1962
123.7 mm (4.9 in)
1963
42.4 mm (1.7 in)
1964
135.1 mm (5.3 in)
1965
102.4 mm (4.0 in)
1966
64.8 mm (2.6 in)
1967
110.7 mm (4.4 in)
1968
71.1 mm (2.8 in)
1969
73.2 mm (2.9 in)
1970
121.4 mm (4.8 in)
1971
76.2 mm (3.0 in)
1972
63.5 mm (2.5 in)
1973
117.6 mm (4.6 in)
1974
139.7 mm (5.5 in)
1975
50.8 mm (2.0 in)
1976
51.3 mm (2.0 in)
1977
176.3 mm (6.9 in)
1978
89.4 mm (3.5 in)
1979
71.1 mm (2.8 in)
1980
107.4 mm (4.2 in)
1981
62.7 mm (2.5 in)
1982
170.2 mm (6.7 in)
1983
81.3 mm (3.2 in)
1984
74.2 mm (2.9 in)
1985
139.7 mm (5.5 in)
1986
109.2 mm (4.3 in)
1987
108.0 mm (4.3 in)
1988
45.0 mm (1.8 in)
1989
85.3 mm (3.4 in)
1990
166.9 mm (6.6 in)
1991
85.6 mm (3.4 in)
1992
120.1 mm (4.7 in)
1993
168.1 mm (6.6 in)
1994
169.4 mm (6.7 in)
1995
67.3 mm (2.6 in)
1996
104.1 mm (4.1 in)
1997
53.6 mm (2.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Denison Dam, 1940 to 1997. The record is 250.0 mm (9.8 in) in 1946, marked on the chart; the median year is 130.2 mm (5.1 in).
Wettest five days (Rx5day) at Denison Dam by year
Year
Wettest five days (Rx5day)
1940
123.4 mm (4.9 in)
1941
115.1 mm (4.5 in)
1942
121.2 mm (4.8 in)
1943
101.1 mm (4.0 in)
1944
78.7 mm (3.1 in)
1945
137.9 mm (5.4 in)
1946
250.0 mm (9.8 in)
1947
43.7 mm (1.7 in)
1948
152.5 mm (6.0 in)
1949
111.4 mm (4.4 in)
1950
102.4 mm (4.0 in)
1951
98.3 mm (3.9 in)
1952
96.6 mm (3.8 in)
1953
67.3 mm (2.6 in)
1954
121.8 mm (4.8 in)
1955
144.0 mm (5.7 in)
1956
76.0 mm (3.0 in)
1957
162.5 mm (6.4 in)
1958
195.6 mm (7.7 in)
1959
133.8 mm (5.3 in)
1960
103.9 mm (4.1 in)
1961
93.5 mm (3.7 in)
1962
157.9 mm (6.2 in)
1963
66.1 mm (2.6 in)
1964
145.7 mm (5.7 in)
1965
160.0 mm (6.3 in)
1966
132.8 mm (5.2 in)
1967
200.6 mm (7.9 in)
1968
87.1 mm (3.4 in)
1969
119.2 mm (4.7 in)
1970
137.6 mm (5.4 in)
1971
160.3 mm (6.3 in)
1972
98.0 mm (3.9 in)
1973
145.5 mm (5.7 in)
1974
167.1 mm (6.6 in)
1975
72.6 mm (2.9 in)
1976
106.2 mm (4.2 in)
1977
192.8 mm (7.6 in)
1978
132.6 mm (5.2 in)
1979
111.9 mm (4.4 in)
1980
199.7 mm (7.9 in)
1981
174.5 mm (6.9 in)
1982
174.8 mm (6.9 in)
1983
127.5 mm (5.0 in)
1984
110.2 mm (4.3 in)
1985
147.3 mm (5.8 in)
1986
112.2 mm (4.4 in)
1987
137.5 mm (5.4 in)
1988
65.0 mm (2.6 in)
1989
144.7 mm (5.7 in)
1990
192.0 mm (7.6 in)
1991
195.8 mm (7.7 in)
1992
141.7 mm (5.6 in)
1993
178.3 mm (7.0 in)
1994
231.1 mm (9.1 in)
1995
127.8 mm (5.0 in)
1996
104.1 mm (4.1 in)
1997
71.7 mm (2.8 in)
Longest dry spell (CDD)
The longest dry spell of the year at Denison Dam, 1940 to 1997. The record is 64 days in 1955, marked on the chart; the median year is 28 days.
Longest dry spell (CDD) at Denison Dam by year
Year
Longest dry spell (CDD)
1940
18 days
1941
16 days
1942
25 days
1943
48 days
1944
37 days
1945
32 days
1946
33 days
1947
31 days
1948
27 days
1949
19 days
1950
46 days
1951
28 days
1952
33 days
1953
22 days
1954
37 days
1955
64 days
1956
30 days
1957
26 days
1958
23 days
1959
29 days
1960
22 days
1961
22 days
1962
29 days
1963
35 days
1964
28 days
1965
26 days
1966
38 days
1967
31 days
1968
14 days
1969
31 days
1970
30 days
1971
34 days
1972
31 days
1973
15 days
1974
21 days
1975
27 days
1976
22 days
1977
27 days
1978
40 days
1979
24 days
1980
42 days
1981
23 days
1982
26 days
1983
26 days
1984
25 days
1985
28 days
1986
48 days
1987
19 days
1988
23 days
1989
33 days
1990
34 days
1991
31 days
1992
20 days
1993
37 days
1994
17 days
1995
36 days
1996
59 days
1997
27 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
52 years with a frost
Across 52 years with a frost, the median last spring frost at Denison Dam falls on 22 March and the median first autumn frost on 14 November, which leaves a median of 239 days between them.
Fitted over all years, the growing season changes by +3.3 days per decade at this station.
Frost dates and growing season at Denison Dam
Measure
Median, all years
Earliest period
Recent period (1965 to 1996)
Recent against earliest
Fitted trend
Last spring frost
22 March
n/a
20 March
n/a
-1.3 days per decade
First autumn frost
14 November
n/a
16 November
n/a
+1.9 days per decade
Growing days
239 days
n/a
244 days
n/a
+3.3 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
56 years, 1940 to 1996
A day with at least 89.2 mm (3.5 in) of rain is expected about once in 2 years. A day with at least 207.4 mm (8.2 in) of rain is expected about once in 100 years.
Rainfall return levels at Denison Dam: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
89.2 mm (3.5 in)
5 years
121.6 mm (4.8 in)
10 years
142.7 mm (5.6 in)
25 years
169.1 mm (6.7 in)
50 years
188.4 mm (7.4 in)
100 years
207.4 mm (8.2 in)
Longer than the 56 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, 56 years of values from 1940 to 1996.
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: 176.3 mm (6.9 in) in 1977; 170.2 mm (6.7 in) in 1982; 169.4 mm (6.7 in) in 1994.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Denison Dam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Denison Dam 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.