Record envelope, standing records and threshold days for Dennison Wtr Wks (USC00332156), Ohio, United States, with 73 years of record.
Key Facts for Dennison Wtr Wks
Dennison Wtr Wks (USC00332156) is a weather station in Ohio, United States at 40.40 latitude and -81.35 longitude, 259 m (850 ft) above sea level.
The station reports from 1909 to 1981, 73 years of record.
1,464 records set at Dennison Wtr Wks still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Dennison Wtr Wks set a daily record low minimum temperature of -6.7 C (19.9 F) on 24 October 1981.
About the Station
Location: Ohio, United States, 40.40 latitude, -81.35 longitude.
Elevation: 259 m (850 ft).
Period of record: 1909 to 1981, 73 years.
Eligible elements: tmax, tmin, prcp.
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 Dennison 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 Dennison Wtr Wks, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
23.9 C (75.0 F)
-31.7 C (-25.1 F)
n/a
n/a
Feb
22.8 C (73.0 F)
-30.0 C (-22.0 F)
n/a
n/a
Mar
29.4 C (84.9 F)
-23.9 C (-11.0 F)
n/a
n/a
Apr
33.9 C (93.0 F)
-15.0 C (5.0 F)
n/a
n/a
May
37.2 C (99.0 F)
-7.8 C (18.0 F)
n/a
n/a
Jun
38.3 C (100.9 F)
-1.1 C (30.0 F)
n/a
n/a
Jul
40.6 C (105.1 F)
3.3 C (37.9 F)
n/a
n/a
Aug
40.6 C (105.1 F)
2.8 C (37.0 F)
n/a
n/a
Sep
38.3 C (100.9 F)
-3.3 C (26.1 F)
n/a
n/a
Oct
33.9 C (93.0 F)
-10.0 C (14.0 F)
n/a
n/a
Nov
27.8 C (82.0 F)
-22.8 C (-9.0 F)
n/a
n/a
Dec
21.1 C (70.0 F)
-28.9 C (-20.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Dennison Wtr Wks still stand. 1930 holds the most, with 61.
Standing records at Dennison Wtr Wks by the year they were set
Year set
Standing records
1909
9
1910
39
1911
38
1912
21
1913
26
1914
34
1915
21
1916
25
1917
29
1918
41
1919
18
1920
22
1921
14
1922
14
1923
17
1924
21
1925
35
1926
22
1927
33
1928
22
1929
40
1930
61
1931
31
1932
22
1933
34
1934
38
1935
26
1936
49
1937
27
1938
21
1939
28
1940
29
1941
21
1942
36
1943
21
1944
16
1945
30
1946
8
1948
21
1949
25
1950
29
1951
28
1952
17
1953
18
1954
18
1955
18
1956
26
1957
13
1958
14
1959
9
1973
7
1974
24
1975
17
1976
34
1977
38
1978
13
1979
27
1980
13
1981
16
All-Time Record Progression
1 new records
1 all-time records were set at Dennison Wtr Wks between 16 January 1977 and 16 January 1977. Each dot is a new record.
When Dennison Wtr Wks set new all-time records
Date
Kind
Detail
1977-01-16
Record low maximum temperature
Record low maximum temperature -17.8 C (0.0 F)
Wettest Day of Each Month
Sep: 94.7 mm (3.7 in)
The wettest day on record for each calendar month at Dennison Wtr Wks. The most was 94.7 mm (3.7 in) on 15 September 1911.
Record daily precipitation for each month at Dennison Wtr Wks
Month
Record daily precipitation (mm)
Date
Jan
66.5 mm (2.6 in)
26 January 1952
Feb
58.7 mm (2.3 in)
25 February 1956
Mar
60.5 mm (2.4 in)
6 March 1945
Apr
51.3 mm (2.0 in)
12 April 1948
May
65.5 mm (2.6 in)
25 May 1950
Jun
82.3 mm (3.2 in)
25 June 1925
Jul
82.0 mm (3.2 in)
4 July 1935
Aug
70.9 mm (2.8 in)
10 August 1952
Sep
94.7 mm (3.7 in)
15 September 1911
Oct
59.7 mm (2.4 in)
17 October 1975
Nov
51.1 mm (2.0 in)
16 November 1955
Dec
41.7 mm (1.6 in)
29 December 1915
Period of Record Coverage
1909 to 1981
Complete yearUnder 90 percent of days
59 years of record at Dennison Wtr Wks, 1909 to 1981. 6 years have data for under 90 percent of days and are left out of rankings: 1909, 1946, 1959, 1973, 1975, 1976.
Cooler than the station meanWarmer than the station mean
One stripe for each of 45 complete years at Dennison Wtr Wks, 1910 to 1981. Blue stripes are years cooler than the station's own mean of 10.8 C (51.4 F); red stripes are warmer. The coolest year was 1980, at 8.9 C (48.0 F), and the warmest was 1921, at 12.5 C (54.5 F). The strongest colour marks a difference of 2.0 C (3.6 F).
Annual mean temperature at Dennison Wtr Wks as warming stripes, 1910 to 1981
Year
Annual mean temperature
Difference from the station mean
1910
10.7 C
-0.08 C
1911
12.1 C
+1.27 C
1914
10.8 C
+0.01 C
1915
10.7 C
-0.07 C
1916
10.4 C
-0.39 C
1918
11.0 C
+0.21 C
1919
11.5 C
+0.74 C
1920
10.4 C
-0.43 C
1921
12.5 C
+1.69 C
1923
10.7 C
-0.09 C
1924
9.6 C
-1.19 C
1925
10.5 C
-0.31 C
1927
11.0 C
+0.15 C
1928
10.4 C
-0.38 C
1929
10.3 C
-0.48 C
1930
11.4 C
+0.60 C
1931
12.3 C
+1.51 C
1933
11.8 C
+1.03 C
1934
11.0 C
+0.16 C
1935
10.8 C
-0.01 C
1936
10.7 C
-0.15 C
1937
10.8 C
-0.04 C
1938
11.8 C
+1.01 C
1939
11.6 C
+0.81 C
1940
9.4 C
-1.38 C
1941
11.0 C
+0.19 C
1942
11.3 C
+0.45 C
1943
10.5 C
-0.34 C
1944
11.1 C
+0.31 C
1945
10.8 C
+0.03 C
1948
11.1 C
+0.33 C
1949
12.1 C
+1.28 C
1950
10.5 C
-0.31 C
1951
10.6 C
-0.16 C
1952
11.4 C
+0.64 C
1953
11.8 C
+0.95 C
1954
11.3 C
+0.46 C
1955
11.1 C
+0.34 C
1956
10.6 C
-0.19 C
1957
10.8 C
+0.00 C
1958
9.7 C
-1.10 C
1977
9.1 C
-1.69 C
1979
8.9 C
-1.89 C
1980
8.9 C
-1.92 C
1981
9.1 C
-1.67 C
The annual mean temperature here has fallen by 0.2 C (0.1 to 0.3) per decade over 1910 to 1981. In Fahrenheit: 0.4 F (0.2 to 0.6) per decade. The slope is a straight line fitted to 45 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Dennison Wtr Wks
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
1910 to 1981
45
Fall
Mean daily maximum
-0.3 C (-0.4 to -0.2) per decade
-0.5 F (-0.8 to -0.3) per decade
1910 to 1981
45
Fall
Mean daily minimum
-0.15 C (-0.29 to 0.00) per decade
-0.26 F (-0.53 to 0.00) per decade
1910 to 1981
45
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
1909 to 1981
Yearly extremes at Dennison Wtr Wks: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
40.6 C (105.1 F)
1911
35.6 C (96.1 F)
59
Coldest night (TNn)
-31.7 C (-25.1 F)
1918
-22.8 C (-9.0 F)
59
Wettest day (Rx1day)
94.7 mm (3.7 in)
1911
53.1 mm (2.1 in)
59
Wettest five days (Rx5day)
163.1 mm (6.4 in)
1941
81.0 mm (3.2 in)
59
Longest dry spell (CDD)
31 days
1955
15 days
59
Hottest day (TXx)
The hottest day of the year at Dennison Wtr Wks, 1909 to 1981. The record is 40.6 C (105.1 F) in 1911, marked on the chart; the median year is 35.6 C (96.1 F).
Hottest day (TXx) at Dennison Wtr Wks by year
Year
Hottest day (TXx)
1909
33.9 C (93.0 F)
1910
36.1 C (97.0 F)
1911
40.6 C (105.1 F)
1912
36.1 C (97.0 F)
1913
38.3 C (100.9 F)
1914
36.7 C (98.1 F)
1915
33.9 C (93.0 F)
1916
37.2 C (99.0 F)
1917
35.0 C (95.0 F)
1918
40.6 C (105.1 F)
1919
36.7 C (98.1 F)
1920
32.8 C (91.0 F)
1921
36.7 C (98.1 F)
1922
35.6 C (96.1 F)
1923
34.4 C (93.9 F)
1924
35.6 C (96.1 F)
1925
36.7 C (98.1 F)
1926
37.2 C (99.0 F)
1927
33.9 C (93.0 F)
1928
33.9 C (93.0 F)
1929
34.4 C (93.9 F)
1930
40.0 C (104.0 F)
1931
37.8 C (100.0 F)
1932
36.7 C (98.1 F)
1933
37.8 C (100.0 F)
1934
38.9 C (102.0 F)
1935
33.9 C (93.0 F)
1936
38.9 C (102.0 F)
1937
35.0 C (95.0 F)
1938
34.4 C (93.9 F)
1939
36.7 C (98.1 F)
1940
33.9 C (93.0 F)
1941
33.9 C (93.0 F)
1942
35.6 C (96.1 F)
1943
35.0 C (95.0 F)
1944
36.7 C (98.1 F)
1945
35.0 C (95.0 F)
1946
31.1 C (88.0 F)
1948
38.3 C (100.9 F)
1949
36.1 C (97.0 F)
1950
34.4 C (93.9 F)
1951
33.3 C (91.9 F)
1952
37.2 C (99.0 F)
1953
38.3 C (100.9 F)
1954
37.8 C (100.0 F)
1955
37.2 C (99.0 F)
1956
32.8 C (91.0 F)
1957
33.9 C (93.0 F)
1958
32.2 C (90.0 F)
1959
33.3 C (91.9 F)
1973
33.9 C (93.0 F)
1974
32.8 C (91.0 F)
1975
33.9 C (93.0 F)
1976
33.9 C (93.0 F)
1977
36.1 C (97.0 F)
1978
33.3 C (91.9 F)
1979
32.2 C (90.0 F)
1980
35.6 C (96.1 F)
1981
33.3 C (91.9 F)
Coldest night (TNn)
The coldest night of the year at Dennison Wtr Wks, 1909 to 1981. The record is -31.7 C (-25.1 F) in 1918, marked on the chart; the median year is -22.8 C (-9.0 F).
Coldest night (TNn) at Dennison Wtr Wks by year
Year
Coldest night (TNn)
1909
-25.6 C (-14.1 F)
1910
-25.6 C (-14.1 F)
1911
-22.2 C (-8.0 F)
1912
-26.7 C (-16.1 F)
1913
-17.8 C (0.0 F)
1914
-29.4 C (-20.9 F)
1915
-22.2 C (-8.0 F)
1916
-22.2 C (-8.0 F)
1917
-28.9 C (-20.0 F)
1918
-31.7 C (-25.1 F)
1919
-20.6 C (-5.1 F)
1920
-19.4 C (-2.9 F)
1921
-13.3 C (8.1 F)
1922
-17.8 C (0.0 F)
1923
-17.8 C (0.0 F)
1924
-26.1 C (-15.0 F)
1925
-29.4 C (-20.9 F)
1926
-25.0 C (-13.0 F)
1927
-18.3 C (-0.9 F)
1928
-20.6 C (-5.1 F)
1929
-22.8 C (-9.0 F)
1930
-24.4 C (-11.9 F)
1931
-15.0 C (5.0 F)
1932
-25.6 C (-14.1 F)
1933
-21.7 C (-7.1 F)
1934
-30.0 C (-22.0 F)
1935
-24.4 C (-11.9 F)
1936
-27.2 C (-17.0 F)
1937
-15.6 C (3.9 F)
1938
-17.8 C (0.0 F)
1939
-17.8 C (0.0 F)
1940
-23.9 C (-11.0 F)
1941
-17.2 C (1.0 F)
1942
-29.4 C (-20.9 F)
1943
-23.9 C (-11.0 F)
1944
-21.7 C (-7.1 F)
1945
-20.6 C (-5.1 F)
1946
-20.0 C (-4.0 F)
1948
-26.7 C (-16.1 F)
1949
-17.2 C (1.0 F)
1950
-26.1 C (-15.0 F)
1951
-27.8 C (-18.0 F)
1952
-17.2 C (1.0 F)
1953
-17.8 C (0.0 F)
1954
-17.8 C (0.0 F)
1955
-23.3 C (-9.9 F)
1956
-15.6 C (3.9 F)
1957
-22.8 C (-9.0 F)
1958
-23.3 C (-9.9 F)
1959
-20.6 C (-5.1 F)
1973
-11.7 C (10.9 F)
1974
-17.2 C (1.0 F)
1975
-25.6 C (-14.1 F)
1976
-22.8 C (-9.0 F)
1977
-29.4 C (-20.9 F)
1978
-26.1 C (-15.0 F)
1979
-27.2 C (-17.0 F)
1980
-21.1 C (-6.0 F)
1981
-27.2 C (-17.0 F)
Wettest day (Rx1day)
The wettest day of the year at Dennison Wtr Wks, 1909 to 1981. The record is 94.7 mm (3.7 in) in 1911, marked on the chart; the median year is 53.1 mm (2.1 in).
Wettest day (Rx1day) at Dennison Wtr Wks by year
Year
Wettest day (Rx1day)
1909
64.3 mm (2.5 in)
1910
61.7 mm (2.4 in)
1911
94.7 mm (3.7 in)
1912
71.9 mm (2.8 in)
1913
45.7 mm (1.8 in)
1914
50.3 mm (2.0 in)
1915
62.2 mm (2.4 in)
1916
47.0 mm (1.9 in)
1917
34.3 mm (1.4 in)
1918
36.1 mm (1.4 in)
1919
38.1 mm (1.5 in)
1920
37.6 mm (1.5 in)
1921
40.1 mm (1.6 in)
1922
61.2 mm (2.4 in)
1923
57.9 mm (2.3 in)
1924
47.0 mm (1.9 in)
1925
82.3 mm (3.2 in)
1926
65.3 mm (2.6 in)
1927
41.9 mm (1.6 in)
1928
45.2 mm (1.8 in)
1929
56.6 mm (2.2 in)
1930
27.4 mm (1.1 in)
1931
66.3 mm (2.6 in)
1932
55.9 mm (2.2 in)
1933
36.8 mm (1.4 in)
1934
40.6 mm (1.6 in)
1935
82.0 mm (3.2 in)
1936
56.6 mm (2.2 in)
1937
58.2 mm (2.3 in)
1938
52.3 mm (2.1 in)
1939
48.3 mm (1.9 in)
1940
53.6 mm (2.1 in)
1941
80.0 mm (3.1 in)
1942
49.5 mm (1.9 in)
1943
38.1 mm (1.5 in)
1944
35.6 mm (1.4 in)
1945
61.5 mm (2.4 in)
1946
46.0 mm (1.8 in)
1948
54.1 mm (2.1 in)
1949
45.0 mm (1.8 in)
1950
65.5 mm (2.6 in)
1951
43.9 mm (1.7 in)
1952
70.9 mm (2.8 in)
1953
43.2 mm (1.7 in)
1954
58.9 mm (2.3 in)
1955
51.1 mm (2.0 in)
1956
67.6 mm (2.7 in)
1957
53.1 mm (2.1 in)
1958
68.1 mm (2.7 in)
1959
55.4 mm (2.2 in)
1973
36.8 mm (1.4 in)
1974
42.4 mm (1.7 in)
1975
59.7 mm (2.4 in)
1976
54.6 mm (2.1 in)
1977
36.8 mm (1.4 in)
1978
37.1 mm (1.5 in)
1979
38.4 mm (1.5 in)
1980
62.2 mm (2.4 in)
1981
87.1 mm (3.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Dennison Wtr Wks, 1909 to 1981. The record is 163.1 mm (6.4 in) in 1941, marked on the chart; the median year is 81.0 mm (3.2 in).
Wettest five days (Rx5day) at Dennison Wtr Wks by year
Year
Wettest five days (Rx5day)
1909
80.4 mm (3.2 in)
1910
77.2 mm (3.0 in)
1911
103.3 mm (4.1 in)
1912
55.4 mm (2.2 in)
1913
81.5 mm (3.2 in)
1914
82.8 mm (3.3 in)
1915
111.0 mm (4.4 in)
1916
68.9 mm (2.7 in)
1917
59.8 mm (2.4 in)
1918
66.3 mm (2.6 in)
1919
68.3 mm (2.7 in)
1920
80.5 mm (3.2 in)
1921
76.2 mm (3.0 in)
1922
69.1 mm (2.7 in)
1923
94.8 mm (3.7 in)
1924
102.7 mm (4.0 in)
1925
95.0 mm (3.7 in)
1926
127.4 mm (5.0 in)
1927
75.3 mm (3.0 in)
1928
68.5 mm (2.7 in)
1929
75.9 mm (3.0 in)
1930
42.3 mm (1.7 in)
1931
61.5 mm (2.4 in)
1932
61.0 mm (2.4 in)
1933
73.4 mm (2.9 in)
1934
65.5 mm (2.6 in)
1935
107.2 mm (4.2 in)
1936
79.2 mm (3.1 in)
1937
126.8 mm (5.0 in)
1938
85.9 mm (3.4 in)
1939
85.6 mm (3.4 in)
1940
81.0 mm (3.2 in)
1941
163.1 mm (6.4 in)
1942
79.3 mm (3.1 in)
1943
83.1 mm (3.3 in)
1944
65.1 mm (2.6 in)
1945
88.4 mm (3.5 in)
1946
56.9 mm (2.2 in)
1948
101.1 mm (4.0 in)
1949
95.7 mm (3.8 in)
1950
95.5 mm (3.8 in)
1951
64.7 mm (2.5 in)
1952
100.9 mm (4.0 in)
1953
63.0 mm (2.5 in)
1954
89.1 mm (3.5 in)
1955
65.3 mm (2.6 in)
1956
87.9 mm (3.5 in)
1957
85.1 mm (3.4 in)
1958
101.4 mm (4.0 in)
1959
84.6 mm (3.3 in)
1973
74.4 mm (2.9 in)
1974
90.2 mm (3.6 in)
1975
101.9 mm (4.0 in)
1976
127.0 mm (5.0 in)
1977
67.0 mm (2.6 in)
1978
69.9 mm (2.8 in)
1979
67.2 mm (2.6 in)
1980
110.5 mm (4.4 in)
1981
111.0 mm (4.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Dennison Wtr Wks, 1909 to 1981. The record is 31 days in 1955, marked on the chart; the median year is 15 days.
Longest dry spell (CDD) at Dennison Wtr Wks by year
Year
Longest dry spell (CDD)
1909
13 days
1910
19 days
1911
17 days
1912
24 days
1913
18 days
1914
16 days
1915
19 days
1916
15 days
1917
17 days
1918
18 days
1919
15 days
1920
22 days
1921
12 days
1922
19 days
1923
15 days
1924
22 days
1925
15 days
1926
14 days
1927
13 days
1928
13 days
1929
14 days
1930
14 days
1931
17 days
1932
16 days
1933
15 days
1934
20 days
1935
14 days
1936
26 days
1937
14 days
1938
17 days
1939
14 days
1940
13 days
1941
20 days
1942
24 days
1943
26 days
1944
18 days
1945
11 days
1946
8 days
1948
18 days
1949
13 days
1950
12 days
1951
16 days
1952
18 days
1953
20 days
1954
14 days
1955
31 days
1956
12 days
1957
14 days
1958
13 days
1959
9 days
1973
15 days
1974
15 days
1975
12 days
1976
25 days
1977
17 days
1978
11 days
1979
10 days
1980
12 days
1981
16 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
45 years with a frost
Across 45 years with a frost, the median last spring frost at Dennison Wtr Wks falls on 13 May and the median first autumn frost on 4 October, which leaves a median of 147 days between them.
Fitted over all years, the growing season changes by +1.2 days per decade at this station.
Frost dates and growing season at Dennison Wtr Wks
Measure
Median, all years
Earliest period
Recent period (1930 to 1981)
Recent against earliest
Fitted trend
Last spring frost
13 May
n/a
11 May
n/a
-2.2 days per decade
First autumn frost
4 October
n/a
4 October
n/a
-1.0 days per decade
Growing days
147 days
n/a
147 days
n/a
+1.2 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
44 years, 1910 to 1981
A day with at least 51.6 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 101.1 mm (4.0 in) of rain is expected about once in 100 years.
Rainfall return levels at Dennison 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
51.6 mm (2.0 in)
5 years
64.6 mm (2.5 in)
10 years
73.3 mm (2.9 in)
25 years
84.4 mm (3.3 in)
50 years
92.7 mm (3.6 in)
Longer than the 44 years of record
100 years
101.1 mm (4.0 in)
Longer than the 44 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, 44 years of values from 1910 to 1981.
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: 94.7 mm (3.7 in) in 1911; 87.1 mm (3.4 in) in 1981; 82.0 mm (3.2 in) in 1935.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Dennison Wtr Wks standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Dennison 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.