Record envelope, standing records and threshold days for Caldwell 6 NW (USC00331178), Ohio, United States, with 55 years of record.
Key Facts for Caldwell 6 NW
Caldwell 6 NW (USC00331178) is a weather station in Ohio, United States at 39.82 latitude and -81.60 longitude, 299 m (980 ft) above sea level.
The station reports from 1936 to 1990, 55 years of record.
1,464 records set at Caldwell 6 NW still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Caldwell 6 NW set a daily record precipitation of 32.3 mm (1.3 in) on 30 September 1990.
About the Station
Location: Ohio, United States, 39.82 latitude, -81.60 longitude.
Elevation: 299 m (980 ft).
Period of record: 1936 to 1990, 55 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 Caldwell 6 NW. 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 Caldwell 6 NW, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
21.7 C (71.1 F)
-30.6 C (-23.1 F)
n/a
n/a
Feb
22.8 C (73.0 F)
-28.3 C (-18.9 F)
n/a
n/a
Mar
30.6 C (87.1 F)
-21.7 C (-7.1 F)
n/a
n/a
Apr
33.9 C (93.0 F)
-11.7 C (10.9 F)
n/a
n/a
May
33.3 C (91.9 F)
-6.1 C (21.0 F)
n/a
n/a
Jun
36.7 C (98.1 F)
-1.1 C (30.0 F)
n/a
n/a
Jul
39.4 C (102.9 F)
1.1 C (34.0 F)
n/a
n/a
Aug
39.4 C (102.9 F)
-0.6 C (30.9 F)
n/a
n/a
Sep
36.7 C (98.1 F)
-2.8 C (27.0 F)
n/a
n/a
Oct
32.8 C (91.0 F)
-10.0 C (14.0 F)
n/a
n/a
Nov
28.3 C (82.9 F)
-20.0 C (-4.0 F)
n/a
n/a
Dec
24.4 C (75.9 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 Caldwell 6 NW still stand. 1936 holds the most, with 64.
Standing records at Caldwell 6 NW by the year they were set
Year set
Standing records
1936
64
1937
28
1938
29
1939
38
1940
51
1941
43
1942
37
1943
41
1944
33
1945
49
1946
31
1947
50
1948
11
1955
24
1956
31
1957
18
1958
31
1959
32
1960
24
1961
32
1962
29
1963
47
1964
27
1965
28
1966
37
1967
32
1968
17
1969
17
1970
17
1971
27
1972
25
1973
21
1974
29
1975
22
1976
37
1977
28
1978
16
1979
38
1980
19
1981
14
1982
26
1983
26
1984
25
1985
25
1986
35
1987
23
1988
36
1989
28
1990
16
All-Time Record Progression
5 new records
5 all-time records were set at Caldwell 6 NW between 17 January 1982 and 21 January 1985. Each dot is a new record.
When Caldwell 6 NW set new all-time records
Date
Kind
Detail
1982-01-17
Record low minimum temperature
Record low minimum temperature -29.4 C (-20.9 F)
1983-08-19
Record high minimum temperature
Record high minimum temperature 26.7 C (80.1 F)
1984-01-21
Record low minimum temperature
Record low minimum temperature -30.0 C (-22.0 F)
1984-08-05
Record daily precipitation
Record daily precipitation 121.9 mm (4.8 in)
1985-01-21
Record low minimum temperature
Record low minimum temperature -30.6 C (-23.1 F)
Wettest Day of Each Month
Aug: 121.9 mm (4.8 in)
The wettest day on record for each calendar month at Caldwell 6 NW. The most was 121.9 mm (4.8 in) on 5 August 1984.
Record daily precipitation for each month at Caldwell 6 NW
Month
Record daily precipitation (mm)
Date
Jan
45.2 mm (1.8 in)
22 January 1937
Feb
55.9 mm (2.2 in)
25 February 1965
Mar
90.2 mm (3.6 in)
6 March 1945
Apr
59.2 mm (2.3 in)
12 April 1948
May
61.0 mm (2.4 in)
27 May 1956
Jun
94.0 mm (3.7 in)
5 June 1963
Jul
97.5 mm (3.8 in)
13 July 1964
Aug
121.9 mm (4.8 in)
5 August 1984
Sep
57.2 mm (2.3 in)
24 September 1975
Oct
69.9 mm (2.8 in)
18 October 1975
Nov
57.2 mm (2.3 in)
27 November 1985
Dec
44.5 mm (1.8 in)
4 December 1978
Period of Record Coverage
1936 to 1990
Complete yearUnder 90 percent of days
49 years of record at Caldwell 6 NW, 1936 to 1990. 4 years have data for under 90 percent of days and are left out of rankings: 1948, 1955, 1985, 1990.
Cooler than the station meanWarmer than the station mean
One stripe for each of 43 complete years at Caldwell 6 NW, 1936 to 1989. Blue stripes are years cooler than the station's own mean of 11.0 C (51.7 F); red stripes are warmer. The coolest year was 1989, at 9.6 C (49.2 F), and the warmest was 1946, at 12.9 C (55.2 F). The strongest colour marks a difference of 2.0 C (3.6 F).
Annual mean temperature at Caldwell 6 NW as warming stripes, 1936 to 1989
Year
Annual mean temperature
Difference from the station mean
1936
11.5 C
+0.57 C
1937
11.2 C
+0.23 C
1938
12.4 C
+1.43 C
1939
12.2 C
+1.20 C
1940
10.7 C
-0.27 C
1941
12.2 C
+1.20 C
1942
11.6 C
+0.69 C
1943
11.2 C
+0.24 C
1944
12.0 C
+1.06 C
1945
11.9 C
+0.95 C
1946
12.9 C
+1.95 C
1947
11.6 C
+0.62 C
1956
11.5 C
+0.56 C
1957
11.7 C
+0.72 C
1958
10.0 C
-0.92 C
1960
10.2 C
-0.76 C
1961
10.6 C
-0.36 C
1962
10.1 C
-0.83 C
1963
9.6 C
-1.35 C
1964
11.1 C
+0.12 C
1965
10.9 C
-0.04 C
1966
10.1 C
-0.90 C
1967
10.8 C
-0.18 C
1968
10.5 C
-0.46 C
1969
10.2 C
-0.71 C
1970
11.0 C
+0.08 C
1971
10.8 C
-0.16 C
1972
10.8 C
-0.17 C
1973
12.0 C
+1.09 C
1974
10.9 C
-0.06 C
1975
11.1 C
+0.19 C
1976
10.4 C
-0.54 C
1977
11.1 C
+0.14 C
1978
10.0 C
-0.93 C
1979
10.1 C
-0.89 C
1980
10.2 C
-0.72 C
1981
10.3 C
-0.63 C
1982
11.0 C
+0.09 C
1983
11.4 C
+0.48 C
1984
10.7 C
-0.26 C
1986
10.7 C
-0.28 C
1987
10.4 C
-0.60 C
1989
9.6 C
-1.39 C
The annual mean temperature here has fallen by 0.3 C (0.2 to 0.4) per decade over 1936 to 1989. In Fahrenheit: 0.5 F (0.3 to 0.7) per decade. The slope is a straight line fitted to 43 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Caldwell 6 NW
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.3 C (-0.4 to -0.2) per decade
-0.5 F (-0.7 to -0.3) per decade
1936 to 1989
43
Fall
Mean daily maximum
-0.13 C (-0.27 to 0.01) per decade
-0.23 F (-0.48 to 0.01) per decade
1936 to 1989
43
Not clearly different from zero
Mean daily minimum
-0.4 C (-0.6 to -0.3) per decade
-0.8 F (-1.1 to -0.5) per decade
1936 to 1989
43
Fall
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
1936 to 1990
Yearly extremes at Caldwell 6 NW: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
39.4 C (102.9 F)
1944
34.4 C (93.9 F)
49
Coldest night (TNn)
-30.6 C (-23.1 F)
1985
-21.7 C (-7.1 F)
49
Wettest day (Rx1day)
121.9 mm (4.8 in)
1984
56.4 mm (2.2 in)
49
Wettest five days (Rx5day)
149.3 mm (5.9 in)
1974
83.4 mm (3.3 in)
49
Longest dry spell (CDD)
43 days
1963
18 days
49
Hottest day (TXx)
The hottest day of the year at Caldwell 6 NW, 1936 to 1990. The record is 39.4 C (102.9 F) in 1944, marked on the chart; the median year is 34.4 C (93.9 F).
Hottest day (TXx) at Caldwell 6 NW by year
Year
Hottest day (TXx)
1936
38.9 C (102.0 F)
1937
33.3 C (91.9 F)
1938
32.8 C (91.0 F)
1939
36.1 C (97.0 F)
1940
37.2 C (99.0 F)
1941
37.2 C (99.0 F)
1942
34.4 C (93.9 F)
1943
34.4 C (93.9 F)
1944
39.4 C (102.9 F)
1945
37.2 C (99.0 F)
1946
35.6 C (96.1 F)
1947
36.7 C (98.1 F)
1948
32.8 C (91.0 F)
1955
36.7 C (98.1 F)
1956
33.3 C (91.9 F)
1957
35.6 C (96.1 F)
1958
32.8 C (91.0 F)
1959
35.6 C (96.1 F)
1960
32.2 C (90.0 F)
1961
32.2 C (90.0 F)
1962
36.1 C (97.0 F)
1963
34.4 C (93.9 F)
1964
34.4 C (93.9 F)
1965
35.0 C (95.0 F)
1966
36.7 C (98.1 F)
1967
32.8 C (91.0 F)
1968
33.3 C (91.9 F)
1969
33.9 C (93.0 F)
1970
34.4 C (93.9 F)
1971
35.0 C (95.0 F)
1972
34.4 C (93.9 F)
1973
35.0 C (95.0 F)
1974
32.2 C (90.0 F)
1975
34.4 C (93.9 F)
1976
33.9 C (93.0 F)
1977
34.4 C (93.9 F)
1978
33.3 C (91.9 F)
1979
31.7 C (89.1 F)
1980
35.6 C (96.1 F)
1981
33.3 C (91.9 F)
1982
32.8 C (91.0 F)
1983
37.2 C (99.0 F)
1984
33.3 C (91.9 F)
1985
32.8 C (91.0 F)
1986
33.3 C (91.9 F)
1987
35.0 C (95.0 F)
1988
39.4 C (102.9 F)
1989
34.4 C (93.9 F)
1990
34.4 C (93.9 F)
Coldest night (TNn)
The coldest night of the year at Caldwell 6 NW, 1936 to 1990. The record is -30.6 C (-23.1 F) in 1985, marked on the chart; the median year is -21.7 C (-7.1 F).
Coldest night (TNn) at Caldwell 6 NW by year
Year
Coldest night (TNn)
1936
-28.3 C (-18.9 F)
1937
-17.8 C (0.0 F)
1938
-16.1 C (3.0 F)
1939
-19.4 C (-2.9 F)
1940
-26.1 C (-15.0 F)
1941
-15.6 C (3.9 F)
1942
-26.7 C (-16.1 F)
1943
-20.6 C (-5.1 F)
1944
-17.2 C (1.0 F)
1945
-20.0 C (-4.0 F)
1946
-17.2 C (1.0 F)
1947
-19.4 C (-2.9 F)
1948
-23.9 C (-11.0 F)
1955
-12.8 C (9.0 F)
1956
-14.4 C (6.1 F)
1957
-22.2 C (-8.0 F)
1958
-22.8 C (-9.0 F)
1959
-21.7 C (-7.1 F)
1960
-20.6 C (-5.1 F)
1961
-24.4 C (-11.9 F)
1962
-23.9 C (-11.0 F)
1963
-28.9 C (-20.0 F)
1964
-19.4 C (-2.9 F)
1965
-22.8 C (-9.0 F)
1966
-21.1 C (-6.0 F)
1967
-20.0 C (-4.0 F)
1968
-25.6 C (-14.1 F)
1969
-18.3 C (-0.9 F)
1970
-22.8 C (-9.0 F)
1971
-23.3 C (-9.9 F)
1972
-25.0 C (-13.0 F)
1973
-18.9 C (-2.0 F)
1974
-17.8 C (0.0 F)
1975
-20.0 C (-4.0 F)
1976
-23.3 C (-9.9 F)
1977
-28.9 C (-20.0 F)
1978
-21.1 C (-6.0 F)
1979
-28.3 C (-18.9 F)
1980
-20.6 C (-5.1 F)
1981
-25.0 C (-13.0 F)
1982
-29.4 C (-20.9 F)
1983
-26.1 C (-15.0 F)
1984
-30.0 C (-22.0 F)
1985
-30.6 C (-23.1 F)
1986
-21.7 C (-7.1 F)
1987
-21.7 C (-7.1 F)
1988
-25.6 C (-14.1 F)
1989
-28.9 C (-20.0 F)
1990
-21.7 C (-7.1 F)
Wettest day (Rx1day)
The wettest day of the year at Caldwell 6 NW, 1936 to 1990. The record is 121.9 mm (4.8 in) in 1984, marked on the chart; the median year is 56.4 mm (2.2 in).
Wettest day (Rx1day) at Caldwell 6 NW by year
Year
Wettest day (Rx1day)
1936
70.6 mm (2.8 in)
1937
88.1 mm (3.5 in)
1938
50.8 mm (2.0 in)
1939
55.9 mm (2.2 in)
1940
56.4 mm (2.2 in)
1941
74.9 mm (2.9 in)
1942
48.3 mm (1.9 in)
1943
43.2 mm (1.7 in)
1944
67.8 mm (2.7 in)
1945
90.2 mm (3.6 in)
1946
37.1 mm (1.5 in)
1947
55.4 mm (2.2 in)
1948
59.2 mm (2.3 in)
1955
76.2 mm (3.0 in)
1956
61.0 mm (2.4 in)
1957
41.9 mm (1.6 in)
1958
44.5 mm (1.8 in)
1959
50.8 mm (2.0 in)
1960
76.2 mm (3.0 in)
1961
57.2 mm (2.3 in)
1962
53.3 mm (2.1 in)
1963
94.0 mm (3.7 in)
1964
97.5 mm (3.8 in)
1965
55.9 mm (2.2 in)
1966
33.8 mm (1.3 in)
1967
31.0 mm (1.2 in)
1968
61.0 mm (2.4 in)
1969
50.3 mm (2.0 in)
1970
59.7 mm (2.4 in)
1971
58.4 mm (2.3 in)
1972
45.7 mm (1.8 in)
1973
38.1 mm (1.5 in)
1974
50.8 mm (2.0 in)
1975
69.9 mm (2.8 in)
1976
58.4 mm (2.3 in)
1977
49.8 mm (2.0 in)
1978
58.4 mm (2.3 in)
1979
39.4 mm (1.6 in)
1980
62.2 mm (2.4 in)
1981
67.3 mm (2.6 in)
1982
45.7 mm (1.8 in)
1983
38.9 mm (1.5 in)
1984
121.9 mm (4.8 in)
1985
78.7 mm (3.1 in)
1986
43.7 mm (1.7 in)
1987
69.1 mm (2.7 in)
1988
69.9 mm (2.8 in)
1989
45.0 mm (1.8 in)
1990
49.5 mm (1.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Caldwell 6 NW, 1936 to 1990. The record is 149.3 mm (5.9 in) in 1974, marked on the chart; the median year is 83.4 mm (3.3 in).
Wettest five days (Rx5day) at Caldwell 6 NW by year
Year
Wettest five days (Rx5day)
1936
91.4 mm (3.6 in)
1937
124.4 mm (4.9 in)
1938
98.3 mm (3.9 in)
1939
91.9 mm (3.6 in)
1940
83.4 mm (3.3 in)
1941
111.9 mm (4.4 in)
1942
61.0 mm (2.4 in)
1943
68.1 mm (2.7 in)
1944
68.1 mm (2.7 in)
1945
128.1 mm (5.0 in)
1946
59.2 mm (2.3 in)
1947
117.7 mm (4.6 in)
1948
108.0 mm (4.3 in)
1955
96.0 mm (3.8 in)
1956
116.9 mm (4.6 in)
1957
46.6 mm (1.8 in)
1958
82.6 mm (3.3 in)
1959
84.3 mm (3.3 in)
1960
78.7 mm (3.1 in)
1961
98.6 mm (3.9 in)
1962
83.0 mm (3.3 in)
1963
124.7 mm (4.9 in)
1964
125.9 mm (5.0 in)
1965
63.5 mm (2.5 in)
1966
59.7 mm (2.4 in)
1967
71.7 mm (2.8 in)
1968
107.3 mm (4.2 in)
1969
60.0 mm (2.4 in)
1970
69.1 mm (2.7 in)
1971
75.7 mm (3.0 in)
1972
60.8 mm (2.4 in)
1973
83.9 mm (3.3 in)
1974
149.3 mm (5.9 in)
1975
123.4 mm (4.9 in)
1976
77.7 mm (3.1 in)
1977
69.1 mm (2.7 in)
1978
75.2 mm (3.0 in)
1979
69.5 mm (2.7 in)
1980
98.8 mm (3.9 in)
1981
115.1 mm (4.5 in)
1982
57.1 mm (2.2 in)
1983
93.6 mm (3.7 in)
1984
130.0 mm (5.1 in)
1985
101.9 mm (4.0 in)
1986
73.2 mm (2.9 in)
1987
71.1 mm (2.8 in)
1988
113.9 mm (4.5 in)
1989
77.3 mm (3.0 in)
1990
66.2 mm (2.6 in)
Longest dry spell (CDD)
The longest dry spell of the year at Caldwell 6 NW, 1936 to 1990. The record is 43 days in 1963, marked on the chart; the median year is 18 days.
Longest dry spell (CDD) at Caldwell 6 NW by year
Year
Longest dry spell (CDD)
1936
18 days
1937
14 days
1938
16 days
1939
18 days
1940
14 days
1941
20 days
1942
16 days
1943
19 days
1944
14 days
1945
14 days
1946
21 days
1947
17 days
1948
12 days
1955
28 days
1956
15 days
1957
16 days
1958
26 days
1959
12 days
1960
25 days
1961
14 days
1962
11 days
1963
43 days
1964
25 days
1965
16 days
1966
18 days
1967
26 days
1968
16 days
1969
29 days
1970
15 days
1971
17 days
1972
12 days
1973
15 days
1974
15 days
1975
15 days
1976
27 days
1977
31 days
1978
32 days
1979
23 days
1980
21 days
1981
26 days
1982
20 days
1983
22 days
1984
20 days
1985
18 days
1986
22 days
1987
29 days
1988
16 days
1989
22 days
1990
20 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
43 years with a frost
Across 43 years with a frost, the median last spring frost at Caldwell 6 NW falls on 6 May and the median first autumn frost on 5 October, which leaves a median of 151 days between them.
Fitted over all years, the growing season changes by -4.6 days per decade at this station.
Frost dates and growing season at Caldwell 6 NW
Measure
Median, all years
Earliest period
Recent period (1957 to 1989)
Recent against earliest
Fitted trend
Last spring frost
6 May
n/a
7 May
n/a
+1.7 days per decade
First autumn frost
5 October
n/a
3 October
n/a
-2.9 days per decade
Growing days
151 days
n/a
150 days
n/a
-4.6 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
46 years, 1936 to 1989
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 121.8 mm (4.8 in) of rain is expected about once in 100 years.
Rainfall return levels at Caldwell 6 NW: 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
71.8 mm (2.8 in)
10 years
83.2 mm (3.3 in)
25 years
98.2 mm (3.9 in)
50 years
109.8 mm (4.3 in)
Longer than the 46 years of record
100 years
121.8 mm (4.8 in)
Longer than the 46 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, 46 years of values from 1936 to 1989.
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: 121.9 mm (4.8 in) in 1984; 97.5 mm (3.8 in) in 1964; 94.0 mm (3.7 in) in 1963.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Caldwell 6 NW, at 1944. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1944 ran 0.5 C (0.9 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Caldwell 6 NW, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1944
+0.5
+0.9
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 Caldwell 6 NW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Caldwell 6 NW 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.