Record envelope, standing records and threshold days for Irwin (USC00333987), Ohio, United States, with 57 years of record.
Key Facts for Irwin
Irwin (USC00333987) is a weather station in Ohio, United States at 40.12 latitude and -83.48 longitude, 308 m (1,010 ft) above sea level.
The station reports from 1941 to 1997, 57 years of record.
1,464 records set at Irwin still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Irwin set a daily record high minimum temperature of 10.6 C (51.1 F) on 29 November 1997.
About the Station
Location: Ohio, United States, 40.12 latitude, -83.48 longitude.
Elevation: 308 m (1,010 ft).
Period of record: 1941 to 1997, 57 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 Irwin. 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 Irwin, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
22.8 C (73.0 F)
-33.3 C (-27.9 F)
n/a
n/a
Feb
22.2 C (72.0 F)
-29.4 C (-20.9 F)
n/a
n/a
Mar
27.8 C (82.0 F)
-27.2 C (-17.0 F)
n/a
n/a
Apr
32.2 C (90.0 F)
-12.2 C (10.0 F)
n/a
n/a
May
35.0 C (95.0 F)
-6.7 C (19.9 F)
n/a
n/a
Jun
38.9 C (102.0 F)
1.1 C (34.0 F)
n/a
n/a
Jul
38.3 C (100.9 F)
3.9 C (39.0 F)
n/a
n/a
Aug
38.3 C (100.9 F)
1.7 C (35.1 F)
n/a
n/a
Sep
38.3 C (100.9 F)
-3.3 C (26.1 F)
n/a
n/a
Oct
32.8 C (91.0 F)
-9.4 C (15.1 F)
n/a
n/a
Nov
26.7 C (80.1 F)
-20.0 C (-4.0 F)
n/a
n/a
Dec
22.2 C (72.0 F)
-28.3 C (-18.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Irwin still stand. 1988 holds the most, with 49.
Standing records at Irwin by the year they were set
Year set
Standing records
1941
40
1942
32
1943
30
1944
18
1945
35
1946
24
1947
34
1948
23
1949
29
1950
43
1951
36
1952
34
1953
32
1954
32
1955
21
1956
19
1957
16
1958
31
1959
28
1960
25
1961
21
1962
28
1963
45
1964
35
1965
22
1966
24
1967
39
1968
27
1969
14
1970
23
1971
21
1972
21
1973
11
1974
28
1975
17
1976
28
1977
35
1978
21
1979
28
1980
16
1981
18
1982
29
1983
26
1984
25
1985
16
1986
26
1987
10
1988
49
1989
24
1990
25
1991
31
1992
12
1993
13
1994
19
1995
18
1996
21
1997
16
All-Time Record Progression
6 new records
6 all-time records were set at Irwin between 17 January 1977 and 19 January 1994. Each dot is a new record.
When Irwin set new all-time records
Date
Kind
Detail
1977-01-17
Record low minimum temperature
Record low minimum temperature -29.4 C (-20.9 F)
1978-01-21
Record snow depth
Record snow depth 43.2 cm (17.0 in)
1982-01-17
Record low maximum temperature
Record low maximum temperature -22.2 C (-8.0 F)
1984-01-21
Record low minimum temperature
Record low minimum temperature -30.0 C (-22.0 F)
1985-01-20
Record low minimum temperature
Record low minimum temperature -31.1 C (-24.0 F)
1994-01-19
Record low minimum temperature
Record low minimum temperature -33.3 C (-27.9 F)
Wettest Day of Each Month
Jan: 129.5 mm (5.1 in)
The wettest day on record for each calendar month at Irwin. The most was 129.5 mm (5.1 in) on 21 January 1959.
Record daily precipitation for each month at Irwin
Month
Record daily precipitation (mm)
Date
Jan
129.5 mm (5.1 in)
21 January 1959
Feb
64.3 mm (2.5 in)
10 February 1959
Mar
62.2 mm (2.4 in)
6 March 1945
Apr
63.5 mm (2.5 in)
2 April 1970
May
61.0 mm (2.4 in)
9 May 1972
Jun
93.0 mm (3.7 in)
14 June 1981
Jul
114.3 mm (4.5 in)
13 July 1992
Aug
71.1 mm (2.8 in)
5 August 1954
Sep
118.1 mm (4.6 in)
14 September 1979
Oct
81.5 mm (3.2 in)
4 October 1986
Nov
61.7 mm (2.4 in)
20 November 1950
Dec
48.8 mm (1.9 in)
30 December 1990
Period of Record Coverage
1941 to 1997
Complete yearUnder 90 percent of days
57 years of record at Irwin, 1941 to 1997. 2 years have data for under 90 percent of days and are left out of rankings: 1941, 1994.
Cooler than the station meanWarmer than the station mean
One stripe for each of 52 complete years at Irwin, 1942 to 1996. Blue stripes are years cooler than the station's own mean of 10.5 C (51.0 F); red stripes are warmer. The coolest year was 1958, at 8.9 C (48.0 F), and the warmest was 1991, at 12.6 C (54.6 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Irwin as warming stripes, 1942 to 1996
Year
Annual mean temperature
Difference from the station mean
1942
10.6 C
+0.09 C
1943
10.2 C
-0.35 C
1944
10.9 C
+0.33 C
1945
10.1 C
-0.44 C
1946
11.3 C
+0.75 C
1947
10.2 C
-0.37 C
1948
10.5 C
-0.07 C
1949
11.5 C
+1.00 C
1950
10.1 C
-0.46 C
1951
10.3 C
-0.21 C
1952
11.1 C
+0.59 C
1953
11.4 C
+0.88 C
1954
11.3 C
+0.74 C
1955
11.0 C
+0.46 C
1956
10.5 C
-0.02 C
1957
10.5 C
-0.03 C
1958
8.9 C
-1.64 C
1959
10.7 C
+0.13 C
1960
9.5 C
-1.08 C
1961
9.9 C
-0.63 C
1962
9.7 C
-0.83 C
1963
9.3 C
-1.26 C
1964
10.7 C
+0.16 C
1965
10.7 C
+0.16 C
1966
10.2 C
-0.38 C
1967
10.1 C
-0.41 C
1968
10.1 C
-0.41 C
1969
10.0 C
-0.50 C
1970
10.9 C
+0.33 C
1971
10.8 C
+0.25 C
1972
10.3 C
-0.24 C
1973
11.6 C
+1.04 C
1974
10.8 C
+0.22 C
1975
11.2 C
+0.61 C
1976
10.1 C
-0.47 C
1977
10.5 C
-0.07 C
1978
9.5 C
-1.04 C
1980
10.3 C
-0.29 C
1981
10.4 C
-0.15 C
1982
10.6 C
+0.03 C
1983
11.0 C
+0.46 C
1984
10.4 C
-0.13 C
1985
10.3 C
-0.21 C
1986
11.1 C
+0.60 C
1987
11.3 C
+0.77 C
1988
9.9 C
-0.62 C
1989
10.0 C
-0.56 C
1991
12.6 C
+2.01 C
1992
10.9 C
+0.37 C
1993
11.0 C
+0.45 C
1995
11.0 C
+0.42 C
1996
10.5 C
+0.00 C
The fitted trend in annual mean temperature here over 1942 to 1996 is 0.1 C (-0.1 to 0.2) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.1 to 0.3) 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 Irwin
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.1 C (-0.1 to 0.2) per decade
0.1 F (-0.1 to 0.3) per decade
1942 to 1996
52
Not clearly different from zero
Mean daily maximum
0.04 C (-0.09 to 0.17) per decade
0.1 F (-0.2 to 0.3) per decade
1942 to 1996
52
Not clearly different from zero
Mean daily minimum
0.1 C (-0.1 to 0.2) per decade
0.1 F (-0.1 to 0.4) per decade
1942 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
1941 to 1997
Yearly extremes at Irwin: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
38.9 C (102.0 F)
1944
35.6 C (96.1 F)
57
Coldest night (TNn)
-33.3 C (-27.9 F)
1994
-22.2 C (-8.0 F)
57
Wettest day (Rx1day)
129.5 mm (5.1 in)
1959
54.4 mm (2.1 in)
57
Wettest five days (Rx5day)
201.9 mm (7.9 in)
1992
89.2 mm (3.5 in)
57
Longest dry spell (CDD)
48 days
1963
19 days
57
Hottest day (TXx)
The hottest day of the year at Irwin, 1941 to 1997. The record is 38.9 C (102.0 F) in 1944, marked on the chart; the median year is 35.6 C (96.1 F).
Hottest day (TXx) at Irwin by year
Year
Hottest day (TXx)
1941
38.3 C (100.9 F)
1942
36.1 C (97.0 F)
1943
36.1 C (97.0 F)
1944
38.9 C (102.0 F)
1945
35.6 C (96.1 F)
1946
36.1 C (97.0 F)
1947
36.7 C (98.1 F)
1948
37.8 C (100.0 F)
1949
35.6 C (96.1 F)
1950
34.4 C (93.9 F)
1951
37.8 C (100.0 F)
1952
36.7 C (98.1 F)
1953
38.3 C (100.9 F)
1954
38.3 C (100.9 F)
1955
37.8 C (100.0 F)
1956
35.0 C (95.0 F)
1957
35.0 C (95.0 F)
1958
32.2 C (90.0 F)
1959
34.4 C (93.9 F)
1960
34.4 C (93.9 F)
1961
33.9 C (93.0 F)
1962
36.7 C (98.1 F)
1963
35.6 C (96.1 F)
1964
36.1 C (97.0 F)
1965
36.7 C (98.1 F)
1966
36.7 C (98.1 F)
1967
35.0 C (95.0 F)
1968
33.9 C (93.0 F)
1969
33.3 C (91.9 F)
1970
33.9 C (93.0 F)
1971
36.7 C (98.1 F)
1972
34.4 C (93.9 F)
1973
35.0 C (95.0 F)
1974
33.9 C (93.0 F)
1975
35.0 C (95.0 F)
1976
34.4 C (93.9 F)
1977
35.6 C (96.1 F)
1978
35.6 C (96.1 F)
1979
32.8 C (91.0 F)
1980
36.1 C (97.0 F)
1981
33.9 C (93.0 F)
1982
33.3 C (91.9 F)
1983
38.3 C (100.9 F)
1984
34.4 C (93.9 F)
1985
33.3 C (91.9 F)
1986
33.3 C (91.9 F)
1987
34.4 C (93.9 F)
1988
38.3 C (100.9 F)
1989
35.6 C (96.1 F)
1990
35.0 C (95.0 F)
1991
37.2 C (99.0 F)
1992
32.8 C (91.0 F)
1993
36.1 C (97.0 F)
1994
38.3 C (100.9 F)
1995
36.1 C (97.0 F)
1996
35.6 C (96.1 F)
1997
35.6 C (96.1 F)
Coldest night (TNn)
The coldest night of the year at Irwin, 1941 to 1997. The record is -33.3 C (-27.9 F) in 1994, marked on the chart; the median year is -22.2 C (-8.0 F).
Coldest night (TNn) at Irwin by year
Year
Coldest night (TNn)
1941
-12.2 C (10.0 F)
1942
-25.6 C (-14.1 F)
1943
-20.6 C (-5.1 F)
1944
-21.1 C (-6.0 F)
1945
-21.7 C (-7.1 F)
1946
-19.4 C (-2.9 F)
1947
-20.6 C (-5.1 F)
1948
-25.6 C (-14.1 F)
1949
-18.9 C (-2.0 F)
1950
-28.3 C (-18.9 F)
1951
-27.8 C (-18.0 F)
1952
-16.7 C (1.9 F)
1953
-20.0 C (-4.0 F)
1954
-17.8 C (0.0 F)
1955
-22.8 C (-9.0 F)
1956
-22.2 C (-8.0 F)
1957
-26.1 C (-15.0 F)
1958
-25.6 C (-14.1 F)
1959
-23.3 C (-9.9 F)
1960
-25.0 C (-13.0 F)
1961
-27.2 C (-17.0 F)
1962
-23.3 C (-9.9 F)
1963
-28.9 C (-20.0 F)
1964
-21.7 C (-7.1 F)
1965
-25.6 C (-14.1 F)
1966
-21.1 C (-6.0 F)
1967
-21.7 C (-7.1 F)
1968
-24.4 C (-11.9 F)
1969
-18.9 C (-2.0 F)
1970
-23.3 C (-9.9 F)
1971
-21.7 C (-7.1 F)
1972
-26.1 C (-15.0 F)
1973
-19.4 C (-2.9 F)
1974
-21.7 C (-7.1 F)
1975
-25.0 C (-13.0 F)
1976
-20.6 C (-5.1 F)
1977
-29.4 C (-20.9 F)
1978
-25.0 C (-13.0 F)
1979
-26.1 C (-15.0 F)
1980
-21.1 C (-6.0 F)
1981
-24.4 C (-11.9 F)
1982
-28.9 C (-20.0 F)
1983
-26.1 C (-15.0 F)
1984
-30.0 C (-22.0 F)
1985
-31.1 C (-24.0 F)
1986
-20.0 C (-4.0 F)
1987
-23.9 C (-11.0 F)
1988
-21.1 C (-6.0 F)
1989
-28.3 C (-18.9 F)
1990
-17.8 C (0.0 F)
1991
-17.8 C (0.0 F)
1992
-21.7 C (-7.1 F)
1993
-21.7 C (-7.1 F)
1994
-33.3 C (-27.9 F)
1995
-20.6 C (-5.1 F)
1996
-21.7 C (-7.1 F)
1997
-21.1 C (-6.0 F)
Wettest day (Rx1day)
The wettest day of the year at Irwin, 1941 to 1997. The record is 129.5 mm (5.1 in) in 1959, marked on the chart; the median year is 54.4 mm (2.1 in).
Wettest day (Rx1day) at Irwin by year
Year
Wettest day (Rx1day)
1941
37.8 mm (1.5 in)
1942
41.9 mm (1.6 in)
1943
46.5 mm (1.8 in)
1944
39.9 mm (1.6 in)
1945
62.2 mm (2.4 in)
1946
55.4 mm (2.2 in)
1947
48.8 mm (1.9 in)
1948
44.5 mm (1.8 in)
1949
54.4 mm (2.1 in)
1950
61.7 mm (2.4 in)
1951
46.7 mm (1.8 in)
1952
91.7 mm (3.6 in)
1953
52.8 mm (2.1 in)
1954
71.1 mm (2.8 in)
1955
51.8 mm (2.0 in)
1956
39.6 mm (1.6 in)
1957
48.3 mm (1.9 in)
1958
50.8 mm (2.0 in)
1959
129.5 mm (5.1 in)
1960
27.2 mm (1.1 in)
1961
52.1 mm (2.1 in)
1962
52.3 mm (2.1 in)
1963
57.2 mm (2.3 in)
1964
57.2 mm (2.3 in)
1965
45.7 mm (1.8 in)
1966
54.4 mm (2.1 in)
1967
46.5 mm (1.8 in)
1968
45.2 mm (1.8 in)
1969
88.9 mm (3.5 in)
1970
63.5 mm (2.5 in)
1971
58.4 mm (2.3 in)
1972
61.0 mm (2.4 in)
1973
63.5 mm (2.5 in)
1974
53.1 mm (2.1 in)
1975
41.4 mm (1.6 in)
1976
50.8 mm (2.0 in)
1977
79.8 mm (3.1 in)
1978
42.4 mm (1.7 in)
1979
118.1 mm (4.6 in)
1980
79.2 mm (3.1 in)
1981
93.0 mm (3.7 in)
1982
41.9 mm (1.6 in)
1983
63.5 mm (2.5 in)
1984
41.7 mm (1.6 in)
1985
101.6 mm (4.0 in)
1986
82.6 mm (3.3 in)
1987
64.8 mm (2.6 in)
1988
79.8 mm (3.1 in)
1989
52.1 mm (2.1 in)
1990
63.0 mm (2.5 in)
1991
51.3 mm (2.0 in)
1992
114.3 mm (4.5 in)
1993
75.9 mm (3.0 in)
1994
37.3 mm (1.5 in)
1995
51.3 mm (2.0 in)
1996
66.3 mm (2.6 in)
1997
61.0 mm (2.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Irwin, 1941 to 1997. The record is 201.9 mm (7.9 in) in 1992, marked on the chart; the median year is 89.2 mm (3.5 in).
Wettest five days (Rx5day) at Irwin by year
Year
Wettest five days (Rx5day)
1941
73.6 mm (2.9 in)
1942
60.7 mm (2.4 in)
1943
85.6 mm (3.4 in)
1944
97.0 mm (3.8 in)
1945
89.2 mm (3.5 in)
1946
85.3 mm (3.4 in)
1947
75.5 mm (3.0 in)
1948
88.9 mm (3.5 in)
1949
94.9 mm (3.7 in)
1950
89.6 mm (3.5 in)
1951
60.0 mm (2.4 in)
1952
92.5 mm (3.6 in)
1953
71.3 mm (2.8 in)
1954
78.8 mm (3.1 in)
1955
64.0 mm (2.5 in)
1956
59.5 mm (2.3 in)
1957
117.9 mm (4.6 in)
1958
115.2 mm (4.5 in)
1959
149.6 mm (5.9 in)
1960
44.9 mm (1.8 in)
1961
75.9 mm (3.0 in)
1962
71.7 mm (2.8 in)
1963
83.3 mm (3.3 in)
1964
115.6 mm (4.6 in)
1965
100.3 mm (3.9 in)
1966
101.4 mm (4.0 in)
1967
70.0 mm (2.8 in)
1968
125.9 mm (5.0 in)
1969
95.3 mm (3.8 in)
1970
90.4 mm (3.6 in)
1971
68.3 mm (2.7 in)
1972
78.8 mm (3.1 in)
1973
93.4 mm (3.7 in)
1974
77.7 mm (3.1 in)
1975
47.5 mm (1.9 in)
1976
84.3 mm (3.3 in)
1977
79.8 mm (3.1 in)
1978
79.7 mm (3.1 in)
1979
118.1 mm (4.6 in)
1980
105.9 mm (4.2 in)
1981
110.3 mm (4.3 in)
1982
68.9 mm (2.7 in)
1983
108.7 mm (4.3 in)
1984
64.5 mm (2.5 in)
1985
115.1 mm (4.5 in)
1986
164.8 mm (6.5 in)
1987
102.9 mm (4.1 in)
1988
135.3 mm (5.3 in)
1989
81.6 mm (3.2 in)
1990
129.3 mm (5.1 in)
1991
59.2 mm (2.3 in)
1992
201.9 mm (7.9 in)
1993
95.2 mm (3.7 in)
1994
80.2 mm (3.2 in)
1995
99.6 mm (3.9 in)
1996
107.0 mm (4.2 in)
1997
148.9 mm (5.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Irwin, 1941 to 1997. The record is 48 days in 1963, marked on the chart; the median year is 19 days.
Longest dry spell (CDD) at Irwin by year
Year
Longest dry spell (CDD)
1941
21 days
1942
20 days
1943
19 days
1944
29 days
1945
23 days
1946
18 days
1947
13 days
1948
12 days
1949
15 days
1950
15 days
1951
17 days
1952
23 days
1953
29 days
1954
22 days
1955
29 days
1956
19 days
1957
23 days
1958
23 days
1959
23 days
1960
19 days
1961
17 days
1962
20 days
1963
48 days
1964
20 days
1965
16 days
1966
19 days
1967
25 days
1968
21 days
1969
27 days
1970
12 days
1971
13 days
1972
12 days
1973
14 days
1974
14 days
1975
15 days
1976
25 days
1977
34 days
1978
18 days
1979
15 days
1980
12 days
1981
17 days
1982
18 days
1983
23 days
1984
15 days
1985
14 days
1986
16 days
1987
27 days
1988
30 days
1989
19 days
1990
16 days
1991
23 days
1992
18 days
1993
18 days
1994
23 days
1995
29 days
1996
17 days
1997
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
52 years with a frost
Across 52 years with a frost, the median last spring frost at Irwin falls on 4 May and the median first autumn frost on 2 October, which leaves a median of 151 days between them.
Fitted over all years, the growing season changes by +0.1 days per decade at this station.
Frost dates and growing season at Irwin
Measure
Median, all years
Earliest period
Recent period (1964 to 1996)
Recent against earliest
Fitted trend
Last spring frost
4 May
n/a
4 May
n/a
-0.3 days per decade
First autumn frost
2 October
n/a
3 October
n/a
-0.2 days per decade
Growing days
151 days
n/a
151 days
n/a
+0.1 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
55 years, 1942 to 1996
A day with at least 55.5 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 145.9 mm (5.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Irwin: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
55.5 mm (2.2 in)
5 years
73.1 mm (2.9 in)
10 years
87.0 mm (3.4 in)
25 years
107.7 mm (4.2 in)
50 years
125.6 mm (4.9 in)
100 years
145.9 mm (5.7 in)
Longer than the 55 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, 55 years of values from 1942 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: 129.5 mm (5.1 in) in 1959; 118.1 mm (4.6 in) in 1979; 114.3 mm (4.5 in) in 1992.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Irwin standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Irwin 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.