Record envelope, standing records and threshold days for Ironton (USC00333971), Ohio, United States, with 83 years of record.
Key Facts for Ironton
Ironton (USC00333971) is a weather station in Ohio, United States at 38.53 latitude and -82.68 longitude, 165 m (541 ft) above sea level.
The station reports from 1900 to 1982, 83 years of record.
1,464 records set at Ironton still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Ironton tied a daily record high minimum temperature of 19.4 C (66.9 F) on 29 May 1982.
About the Station
Location: Ohio, United States, 38.53 latitude, -82.68 longitude.
Elevation: 165 m (541 ft).
Period of record: 1900 to 1982, 83 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 Ironton. 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 Ironton, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
27.2 C (81.0 F)
-26.1 C (-15.0 F)
n/a
n/a
Feb
26.1 C (79.0 F)
-21.1 C (-6.0 F)
n/a
n/a
Mar
33.3 C (91.9 F)
-21.1 C (-6.0 F)
n/a
n/a
Apr
35.6 C (96.1 F)
-11.1 C (12.0 F)
n/a
n/a
May
36.7 C (98.1 F)
-3.3 C (26.1 F)
n/a
n/a
Jun
38.9 C (102.0 F)
2.8 C (37.0 F)
n/a
n/a
Jul
41.7 C (107.1 F)
4.4 C (39.9 F)
n/a
n/a
Aug
41.1 C (106.0 F)
5.0 C (41.0 F)
n/a
n/a
Sep
39.4 C (102.9 F)
-2.2 C (28.0 F)
n/a
n/a
Oct
34.4 C (93.9 F)
-8.3 C (17.1 F)
n/a
n/a
Nov
30.0 C (86.0 F)
-17.2 C (1.0 F)
n/a
n/a
Dec
26.1 C (79.0 F)
-31.1 C (-24.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Ironton still stand. 1930 holds the most, with 51.
Standing records at Ironton by the year they were set
Year set
Standing records
1900
28
1901
31
1902
18
1903
27
1904
15
1905
17
1906
16
1907
20
1908
17
1909
11
1910
24
1911
23
1912
22
1913
24
1914
42
1915
14
1916
22
1917
43
1918
29
1919
9
1920
21
1921
10
1922
16
1923
17
1924
18
1925
28
1926
11
1927
23
1928
14
1929
31
1930
51
1931
19
1932
25
1933
19
1934
25
1935
11
1936
32
1937
14
1938
9
1939
15
1940
21
1941
22
1942
17
1943
15
1944
13
1945
13
1946
10
1947
16
1948
13
1949
15
1950
21
1951
18
1952
12
1953
16
1954
22
1955
7
1956
13
1957
15
1958
12
1959
11
1960
16
1961
15
1962
19
1963
15
1964
10
1965
9
1966
14
1967
13
1968
6
1969
11
1970
16
1971
15
1972
9
1973
10
1974
11
1975
8
1976
19
1977
21
1978
10
1979
16
1980
20
1981
9
1982
9
All-Time Record Progression
12 new records
12 all-time records were set at Ironton between 20 July 1930 and 31 January 1982. Each dot is a new record.
When Ironton set new all-time records
Date
Kind
Detail
1930-07-20
Record high maximum temperature
Record high maximum temperature 40.6 C (105.1 F)
1930-07-28
Record high maximum temperature
Record high maximum temperature 41.7 C (107.1 F)
1932-07-04
Record daily precipitation
Record daily precipitation 87.1 mm (3.4 in)
1933-08-04
Record daily precipitation
Record daily precipitation 99.6 mm (3.9 in)
1936-01-23
Record low maximum temperature
Record low maximum temperature -12.2 C (10.0 F)
1938-07-02
Record daily precipitation
Record daily precipitation 108.7 mm (4.3 in)
1948-01-24
Record snow depth
Record snow depth 22.9 cm (9.0 in)
1948-02-01
Record snow depth
Record snow depth 25.4 cm (10.0 in)
1950-11-26
Record snow depth
Record snow depth 30.5 cm (12.0 in)
1963-01-24
Record low maximum temperature
Record low maximum temperature -13.9 C (7.0 F)
1982-01-11
Record low maximum temperature
Record low maximum temperature -17.8 C (0.0 F)
1982-01-31
Record snow depth
Record snow depth 61.0 cm (24.0 in)
Wettest Day of Each Month
Jul: 108.7 mm (4.3 in)
The wettest day on record for each calendar month at Ironton. The most was 108.7 mm (4.3 in) on 2 July 1938.
Record daily precipitation for each month at Ironton
Month
Record daily precipitation (mm)
Date
Jan
59.2 mm (2.3 in)
1 January 1919
Feb
58.4 mm (2.3 in)
2 February 1981
Mar
78.7 mm (3.1 in)
12 March 1968
Apr
74.2 mm (2.9 in)
12 April 1948
May
71.9 mm (2.8 in)
27 May 1917
Jun
93.2 mm (3.7 in)
4 June 1951
Jul
108.7 mm (4.3 in)
2 July 1938
Aug
99.6 mm (3.9 in)
4 August 1933
Sep
74.2 mm (2.9 in)
27 September 1976
Oct
71.6 mm (2.8 in)
1 October 1915
Nov
62.7 mm (2.5 in)
26 November 1919
Dec
80.0 mm (3.1 in)
9 December 1978
Period of Record Coverage
1900 to 1982
Complete yearUnder 90 percent of days
83 years of record at Ironton, 1900 to 1982. 3 years have data for under 90 percent of days and are left out of rankings: 1974, 1975, 1982.
Cooler than the station meanWarmer than the station mean
One stripe for each of 77 complete years at Ironton, 1900 to 1981. Blue stripes are years cooler than the station's own mean of 13.3 C (55.9 F); red stripes are warmer. The coolest year was 1981, at 11.6 C (52.8 F), and the warmest was 1949, at 14.7 C (58.5 F). The strongest colour marks a difference of 1.8 C (3.2 F).
Annual mean temperature at Ironton as warming stripes, 1900 to 1981
Year
Annual mean temperature
Difference from the station mean
1900
13.4 C
+0.12 C
1901
12.0 C
-1.22 C
1902
12.6 C
-0.62 C
1903
12.7 C
-0.59 C
1904
12.1 C
-1.15 C
1905
13.0 C
-0.31 C
1906
13.9 C
+0.62 C
1907
12.9 C
-0.32 C
1908
13.8 C
+0.49 C
1909
13.3 C
+0.07 C
1910
12.8 C
-0.43 C
1911
14.3 C
+1.00 C
1912
12.6 C
-0.70 C
1913
13.9 C
+0.68 C
1914
13.3 C
-0.01 C
1915
13.3 C
+0.00 C
1916
13.3 C
+0.07 C
1917
12.1 C
-1.17 C
1918
13.0 C
-0.22 C
1919
13.4 C
+0.18 C
1920
12.2 C
-1.03 C
1921
14.3 C
+1.07 C
1922
13.5 C
+0.25 C
1923
13.2 C
-0.06 C
1924
11.8 C
-1.46 C
1925
13.0 C
-0.27 C
1926
12.4 C
-0.91 C
1927
13.4 C
+0.18 C
1928
12.5 C
-0.78 C
1929
12.6 C
-0.68 C
1930
13.3 C
+0.07 C
1931
14.4 C
+1.10 C
1932
13.9 C
+0.63 C
1933
14.3 C
+0.99 C
1934
14.0 C
+0.71 C
1935
13.5 C
+0.20 C
1936
13.4 C
+0.10 C
1937
13.0 C
-0.26 C
1938
14.2 C
+0.89 C
1939
14.1 C
+0.79 C
1940
12.6 C
-0.66 C
1941
13.9 C
+0.61 C
1942
13.4 C
+0.18 C
1943
13.6 C
+0.36 C
1945
13.5 C
+0.20 C
1947
13.1 C
-0.19 C
1948
13.8 C
+0.50 C
1949
14.7 C
+1.47 C
1950
13.4 C
+0.10 C
1951
13.7 C
+0.44 C
1952
13.9 C
+0.63 C
1953
14.2 C
+0.94 C
1954
14.2 C
+0.92 C
1955
14.0 C
+0.76 C
1956
13.7 C
+0.45 C
1957
14.2 C
+0.89 C
1958
12.4 C
-0.86 C
1959
14.2 C
+0.90 C
1960
12.7 C
-0.52 C
1961
13.4 C
+0.09 C
1962
13.4 C
+0.09 C
1963
12.8 C
-0.47 C
1964
14.0 C
+0.70 C
1965
13.9 C
+0.67 C
1966
13.0 C
-0.23 C
1967
13.4 C
+0.14 C
1968
13.4 C
+0.12 C
1969
13.3 C
+0.08 C
1970
14.2 C
+0.90 C
1971
14.1 C
+0.80 C
1972
13.5 C
+0.21 C
1976
11.9 C
-1.37 C
1977
12.5 C
-0.81 C
1978
11.6 C
-1.68 C
1979
11.8 C
-1.45 C
1980
12.0 C
-1.25 C
1981
11.6 C
-1.71 C
The fitted trend in annual mean temperature here over 1900 to 1981 is 0.00 C (-0.07 to 0.07) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.00 F (-0.13 to 0.13) per decade. The slope is a straight line fitted to 77 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Ironton
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.00 C (-0.07 to 0.07) per decade
0.00 F (-0.13 to 0.13) per decade
1900 to 1981
77
Not clearly different from zero
Mean daily maximum
-0.02 C (-0.10 to 0.06) per decade
-0.03 F (-0.18 to 0.11) per decade
1900 to 1981
77
Not clearly different from zero
Mean daily minimum
0.02 C (-0.06 to 0.10) per decade
0.03 F (-0.11 to 0.18) per decade
1900 to 1981
77
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
1900 to 1982
Yearly extremes at Ironton: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
41.7 C (107.1 F)
1930
36.7 C (98.1 F)
83
Coldest night (TNn)
-31.1 C (-24.0 F)
1917
-18.3 C (-0.9 F)
83
Wettest day (Rx1day)
108.7 mm (4.3 in)
1938
54.1 mm (2.1 in)
83
Wettest five days (Rx5day)
160.6 mm (6.3 in)
1956
94.6 mm (3.7 in)
83
Longest dry spell (CDD)
43 days
1963
19 days
83
Hottest day (TXx)
The hottest day of the year at Ironton, 1900 to 1982. The record is 41.7 C (107.1 F) in 1930, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Ironton by year
Year
Hottest day (TXx)
1900
37.8 C (100.0 F)
1901
39.4 C (102.9 F)
1902
37.2 C (99.0 F)
1903
37.2 C (99.0 F)
1904
35.6 C (96.1 F)
1905
36.1 C (97.0 F)
1906
35.6 C (96.1 F)
1907
35.6 C (96.1 F)
1908
36.7 C (98.1 F)
1909
35.6 C (96.1 F)
1910
34.4 C (93.9 F)
1911
38.9 C (102.0 F)
1912
36.1 C (97.0 F)
1913
37.8 C (100.0 F)
1914
40.0 C (104.0 F)
1915
36.1 C (97.0 F)
1916
37.2 C (99.0 F)
1917
36.7 C (98.1 F)
1918
39.4 C (102.9 F)
1919
36.1 C (97.0 F)
1920
35.0 C (95.0 F)
1921
36.1 C (97.0 F)
1922
35.6 C (96.1 F)
1923
36.7 C (98.1 F)
1924
35.6 C (96.1 F)
1925
35.6 C (96.1 F)
1926
37.8 C (100.0 F)
1927
36.1 C (97.0 F)
1928
34.4 C (93.9 F)
1929
35.6 C (96.1 F)
1930
41.7 C (107.1 F)
1931
38.3 C (100.9 F)
1932
39.4 C (102.9 F)
1933
38.9 C (102.0 F)
1934
41.1 C (106.0 F)
1935
35.6 C (96.1 F)
1936
39.4 C (102.9 F)
1937
36.1 C (97.0 F)
1938
35.6 C (96.1 F)
1939
37.2 C (99.0 F)
1940
38.3 C (100.9 F)
1941
37.8 C (100.0 F)
1942
36.7 C (98.1 F)
1943
38.3 C (100.9 F)
1944
38.9 C (102.0 F)
1945
36.7 C (98.1 F)
1946
36.1 C (97.0 F)
1947
35.0 C (95.0 F)
1948
40.0 C (104.0 F)
1949
37.8 C (100.0 F)
1950
35.6 C (96.1 F)
1951
37.8 C (100.0 F)
1952
39.4 C (102.9 F)
1953
39.4 C (102.9 F)
1954
40.6 C (105.1 F)
1955
36.1 C (97.0 F)
1956
36.7 C (98.1 F)
1957
37.2 C (99.0 F)
1958
33.9 C (93.0 F)
1959
36.7 C (98.1 F)
1960
35.0 C (95.0 F)
1961
36.1 C (97.0 F)
1962
37.2 C (99.0 F)
1963
36.1 C (97.0 F)
1964
37.8 C (100.0 F)
1965
36.1 C (97.0 F)
1966
37.8 C (100.0 F)
1967
36.1 C (97.0 F)
1968
36.7 C (98.1 F)
1969
37.2 C (99.0 F)
1970
37.8 C (100.0 F)
1971
35.6 C (96.1 F)
1972
34.4 C (93.9 F)
1973
34.4 C (93.9 F)
1974
31.7 C (89.1 F)
1975
35.6 C (96.1 F)
1976
35.6 C (96.1 F)
1977
37.2 C (99.0 F)
1978
35.6 C (96.1 F)
1979
35.0 C (95.0 F)
1980
38.9 C (102.0 F)
1981
35.6 C (96.1 F)
1982
33.9 C (93.0 F)
Coldest night (TNn)
The coldest night of the year at Ironton, 1900 to 1982. The record is -31.1 C (-24.0 F) in 1917, marked on the chart; the median year is -18.3 C (-0.9 F).
Coldest night (TNn) at Ironton by year
Year
Coldest night (TNn)
1900
-20.6 C (-5.1 F)
1901
-21.1 C (-6.0 F)
1902
-15.0 C (5.0 F)
1903
-17.8 C (0.0 F)
1904
-18.9 C (-2.0 F)
1905
-20.0 C (-4.0 F)
1906
-20.0 C (-4.0 F)
1907
-19.4 C (-2.9 F)
1908
-13.3 C (8.1 F)
1909
-17.8 C (0.0 F)
1910
-21.1 C (-6.0 F)
1911
-11.7 C (10.9 F)
1912
-23.9 C (-11.0 F)
1913
-14.4 C (6.1 F)
1914
-20.6 C (-5.1 F)
1915
-14.4 C (6.1 F)
1916
-21.1 C (-6.0 F)
1917
-31.1 C (-24.0 F)
1918
-25.6 C (-14.1 F)
1919
-16.7 C (1.9 F)
1920
-17.2 C (1.0 F)
1921
-10.0 C (14.0 F)
1922
-13.9 C (7.0 F)
1923
-15.6 C (3.9 F)
1924
-18.9 C (-2.0 F)
1925
-23.3 C (-9.9 F)
1926
-17.2 C (1.0 F)
1927
-17.8 C (0.0 F)
1928
-17.8 C (0.0 F)
1929
-21.1 C (-6.0 F)
1930
-20.6 C (-5.1 F)
1931
-14.4 C (6.1 F)
1932
-18.3 C (-0.9 F)
1933
-18.3 C (-0.9 F)
1934
-21.1 C (-6.0 F)
1935
-19.4 C (-2.9 F)
1936
-25.6 C (-14.1 F)
1937
-15.0 C (5.0 F)
1938
-12.8 C (9.0 F)
1939
-13.9 C (7.0 F)
1940
-21.1 C (-6.0 F)
1941
-13.3 C (8.1 F)
1942
-21.1 C (-6.0 F)
1943
-17.2 C (1.0 F)
1944
-16.1 C (3.0 F)
1945
-16.7 C (1.9 F)
1946
-15.0 C (5.0 F)
1947
-16.1 C (3.0 F)
1948
-22.2 C (-8.0 F)
1949
-12.2 C (10.0 F)
1950
-15.0 C (5.0 F)
1951
-18.9 C (-2.0 F)
1952
-12.8 C (9.0 F)
1953
-14.4 C (6.1 F)
1954
-17.8 C (0.0 F)
1955
-18.9 C (-2.0 F)
1956
-11.1 C (12.0 F)
1957
-19.4 C (-2.9 F)
1958
-18.9 C (-2.0 F)
1959
-18.9 C (-2.0 F)
1960
-17.2 C (1.0 F)
1961
-18.9 C (-2.0 F)
1962
-19.4 C (-2.9 F)
1963
-26.1 C (-15.0 F)
1964
-18.3 C (-0.9 F)
1965
-17.8 C (0.0 F)
1966
-20.0 C (-4.0 F)
1967
-18.3 C (-0.9 F)
1968
-20.6 C (-5.1 F)
1969
-15.0 C (5.0 F)
1970
-19.4 C (-2.9 F)
1971
-16.7 C (1.9 F)
1972
-16.7 C (1.9 F)
1973
-15.0 C (5.0 F)
1974
-8.9 C (16.0 F)
1975
-11.1 C (12.0 F)
1976
-18.3 C (-0.9 F)
1977
-25.6 C (-14.1 F)
1978
-19.4 C (-2.9 F)
1979
-18.3 C (-0.9 F)
1980
-21.1 C (-6.0 F)
1981
-19.4 C (-2.9 F)
1982
-24.4 C (-11.9 F)
Wettest day (Rx1day)
The wettest day of the year at Ironton, 1900 to 1982. The record is 108.7 mm (4.3 in) in 1938, marked on the chart; the median year is 54.1 mm (2.1 in).
Wettest day (Rx1day) at Ironton by year
Year
Wettest day (Rx1day)
1900
67.3 mm (2.6 in)
1901
59.2 mm (2.3 in)
1902
53.3 mm (2.1 in)
1903
39.1 mm (1.5 in)
1904
27.7 mm (1.1 in)
1905
58.4 mm (2.3 in)
1906
77.5 mm (3.1 in)
1907
51.1 mm (2.0 in)
1908
46.0 mm (1.8 in)
1909
46.2 mm (1.8 in)
1910
43.4 mm (1.7 in)
1911
61.0 mm (2.4 in)
1912
75.7 mm (3.0 in)
1913
67.8 mm (2.7 in)
1914
80.8 mm (3.2 in)
1915
71.6 mm (2.8 in)
1916
54.9 mm (2.2 in)
1917
71.9 mm (2.8 in)
1918
63.5 mm (2.5 in)
1919
62.7 mm (2.5 in)
1920
39.1 mm (1.5 in)
1921
58.9 mm (2.3 in)
1922
37.8 mm (1.5 in)
1923
48.8 mm (1.9 in)
1924
77.7 mm (3.1 in)
1925
45.0 mm (1.8 in)
1926
33.3 mm (1.3 in)
1927
57.9 mm (2.3 in)
1928
55.4 mm (2.2 in)
1929
63.5 mm (2.5 in)
1930
32.0 mm (1.3 in)
1931
57.2 mm (2.3 in)
1932
87.1 mm (3.4 in)
1933
99.6 mm (3.9 in)
1934
37.3 mm (1.5 in)
1935
54.1 mm (2.1 in)
1936
53.3 mm (2.1 in)
1937
50.0 mm (2.0 in)
1938
108.7 mm (4.3 in)
1939
69.1 mm (2.7 in)
1940
54.1 mm (2.1 in)
1941
42.7 mm (1.7 in)
1942
57.9 mm (2.3 in)
1943
76.2 mm (3.0 in)
1944
38.6 mm (1.5 in)
1945
42.2 mm (1.7 in)
1946
50.8 mm (2.0 in)
1947
87.4 mm (3.4 in)
1948
74.2 mm (2.9 in)
1949
49.5 mm (1.9 in)
1950
48.3 mm (1.9 in)
1951
93.2 mm (3.7 in)
1952
66.0 mm (2.6 in)
1953
63.5 mm (2.5 in)
1954
65.8 mm (2.6 in)
1955
47.0 mm (1.9 in)
1956
89.7 mm (3.5 in)
1957
50.8 mm (2.0 in)
1958
62.5 mm (2.5 in)
1959
50.8 mm (2.0 in)
1960
45.2 mm (1.8 in)
1961
38.9 mm (1.5 in)
1962
40.4 mm (1.6 in)
1963
49.3 mm (1.9 in)
1964
63.2 mm (2.5 in)
1965
48.3 mm (1.9 in)
1966
50.8 mm (2.0 in)
1967
72.4 mm (2.9 in)
1968
78.7 mm (3.1 in)
1969
46.5 mm (1.8 in)
1970
42.9 mm (1.7 in)
1971
66.5 mm (2.6 in)
1972
44.7 mm (1.8 in)
1973
43.2 mm (1.7 in)
1974
45.7 mm (1.8 in)
1975
51.3 mm (2.0 in)
1976
74.2 mm (2.9 in)
1977
35.3 mm (1.4 in)
1978
80.0 mm (3.1 in)
1979
57.9 mm (2.3 in)
1980
47.0 mm (1.9 in)
1981
58.4 mm (2.3 in)
1982
32.3 mm (1.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at Ironton, 1900 to 1982. The record is 160.6 mm (6.3 in) in 1956, marked on the chart; the median year is 94.6 mm (3.7 in).
Wettest five days (Rx5day) at Ironton by year
Year
Wettest five days (Rx5day)
1900
105.2 mm (4.1 in)
1901
136.3 mm (5.4 in)
1902
100.0 mm (3.9 in)
1903
66.3 mm (2.6 in)
1904
52.5 mm (2.1 in)
1905
124.8 mm (4.9 in)
1906
106.5 mm (4.2 in)
1907
86.4 mm (3.4 in)
1908
98.7 mm (3.9 in)
1909
84.8 mm (3.3 in)
1910
87.0 mm (3.4 in)
1911
80.8 mm (3.2 in)
1912
90.4 mm (3.6 in)
1913
98.9 mm (3.9 in)
1914
117.8 mm (4.6 in)
1915
111.3 mm (4.4 in)
1916
71.1 mm (2.8 in)
1917
121.7 mm (4.8 in)
1918
92.6 mm (3.6 in)
1919
94.6 mm (3.7 in)
1920
62.7 mm (2.5 in)
1921
79.5 mm (3.1 in)
1922
86.6 mm (3.4 in)
1923
78.2 mm (3.1 in)
1924
104.0 mm (4.1 in)
1925
76.4 mm (3.0 in)
1926
70.4 mm (2.8 in)
1927
103.1 mm (4.1 in)
1928
82.0 mm (3.2 in)
1929
94.5 mm (3.7 in)
1930
54.9 mm (2.2 in)
1931
112.0 mm (4.4 in)
1932
140.7 mm (5.5 in)
1933
132.6 mm (5.2 in)
1934
68.8 mm (2.7 in)
1935
99.3 mm (3.9 in)
1936
90.9 mm (3.6 in)
1937
110.5 mm (4.4 in)
1938
128.5 mm (5.1 in)
1939
128.0 mm (5.0 in)
1940
91.7 mm (3.6 in)
1941
67.3 mm (2.6 in)
1942
86.3 mm (3.4 in)
1943
107.1 mm (4.2 in)
1944
90.7 mm (3.6 in)
1945
99.5 mm (3.9 in)
1946
72.6 mm (2.9 in)
1947
95.5 mm (3.8 in)
1948
131.9 mm (5.2 in)
1949
104.1 mm (4.1 in)
1950
121.7 mm (4.8 in)
1951
99.8 mm (3.9 in)
1952
90.7 mm (3.6 in)
1953
73.7 mm (2.9 in)
1954
112.3 mm (4.4 in)
1955
63.8 mm (2.5 in)
1956
160.6 mm (6.3 in)
1957
95.3 mm (3.8 in)
1958
116.7 mm (4.6 in)
1959
58.0 mm (2.3 in)
1960
98.0 mm (3.9 in)
1961
105.4 mm (4.1 in)
1962
135.2 mm (5.3 in)
1963
87.5 mm (3.4 in)
1964
120.3 mm (4.7 in)
1965
76.9 mm (3.0 in)
1966
125.4 mm (4.9 in)
1967
92.6 mm (3.6 in)
1968
142.2 mm (5.6 in)
1969
83.6 mm (3.3 in)
1970
84.0 mm (3.3 in)
1971
100.5 mm (4.0 in)
1972
79.3 mm (3.1 in)
1973
79.5 mm (3.1 in)
1974
86.0 mm (3.4 in)
1975
85.6 mm (3.4 in)
1976
113.2 mm (4.5 in)
1977
82.1 mm (3.2 in)
1978
143.3 mm (5.6 in)
1979
120.6 mm (4.7 in)
1980
138.7 mm (5.5 in)
1981
83.0 mm (3.3 in)
1982
61.0 mm (2.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Ironton, 1900 to 1982. The record is 43 days in 1963, marked on the chart; the median year is 19 days.
Longest dry spell (CDD) at Ironton by year
Year
Longest dry spell (CDD)
1900
32 days
1901
27 days
1902
21 days
1903
26 days
1904
24 days
1905
19 days
1906
14 days
1907
22 days
1908
22 days
1909
17 days
1910
23 days
1911
11 days
1912
24 days
1913
20 days
1914
22 days
1915
16 days
1916
19 days
1917
23 days
1918
15 days
1919
13 days
1920
27 days
1921
14 days
1922
21 days
1923
27 days
1924
26 days
1925
17 days
1926
11 days
1927
17 days
1928
14 days
1929
12 days
1930
22 days
1931
18 days
1932
14 days
1933
13 days
1934
21 days
1935
21 days
1936
20 days
1937
19 days
1938
23 days
1939
13 days
1940
13 days
1941
23 days
1942
17 days
1943
19 days
1944
22 days
1945
14 days
1946
16 days
1947
23 days
1948
15 days
1949
15 days
1950
16 days
1951
14 days
1952
28 days
1953
36 days
1954
19 days
1955
20 days
1956
17 days
1957
18 days
1958
19 days
1959
19 days
1960
20 days
1961
12 days
1962
14 days
1963
43 days
1964
26 days
1965
17 days
1966
19 days
1967
14 days
1968
17 days
1969
19 days
1970
14 days
1971
12 days
1972
10 days
1973
16 days
1974
13 days
1975
11 days
1976
24 days
1977
21 days
1978
11 days
1979
13 days
1980
22 days
1981
22 days
1982
11 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
77 years with a frost
Across 77 years with a frost, the median last spring frost at Ironton falls on 23 April and the median first autumn frost on 18 October, which leaves a median of 177 days between them.
In 1949 to 1981 the median growing season was 185 days. That is 12 days more than in 1900 to 1929.
Fitted over all years, the growing season changes by +1.8 days per decade at this station.
Frost dates and growing season at Ironton
Measure
Median, all years
Earliest period (1900 to 1929)
Recent period (1949 to 1981)
Recent against earliest
Fitted trend
Last spring frost
23 April
24 April
23 April
1 day earlier
-0.5 days per decade
First autumn frost
18 October
14 October
23 October
9 days later
+1.4 days per decade
Growing days
177 days
173 days
185 days
12 days more
+1.8 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, 1900 to 1981
A day with at least 55.6 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 108.4 mm (4.3 in) of rain is expected about once in 100 years.
Rainfall return levels at Ironton: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
55.6 mm (2.2 in)
5 years
70.6 mm (2.8 in)
10 years
80.2 mm (3.2 in)
25 years
91.9 mm (3.6 in)
50 years
100.3 mm (3.9 in)
100 years
108.4 mm (4.3 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 1900 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: 108.7 mm (4.3 in) in 1938; 99.6 mm (3.9 in) in 1933; 93.2 mm (3.7 in) in 1951.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Ironton, at 1940. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1940 ran 0.5 C (0.8 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Ironton, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1940
+0.5
+0.8
likely
5
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
Data for Ironton standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Ironton 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.