Record envelope, standing records and threshold days for Napoleon (USC00335669), Ohio, United States, with 48 years of record.
Key Facts for Napoleon
Napoleon (USC00335669) is a weather station in Ohio, United States at 41.39 latitude and -84.11 longitude, 208 m (682 ft) above sea level.
The station reports from 1962 to 2009, 48 years of record.
1,464 records set at Napoleon still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Napoleon set a daily record precipitation of 28.4 mm (1.1 in) on 14 May 2009.
About the Station
Location: Ohio, United States, 41.39 latitude, -84.11 longitude.
Elevation: 208 m (682 ft).
Period of record: 1962 to 2009, 48 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 Napoleon. 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 Napoleon, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
18.3 C (64.9 F)
-31.1 C (-24.0 F)
n/a
n/a
Feb
20.6 C (69.1 F)
-25.0 C (-13.0 F)
n/a
n/a
Mar
26.7 C (80.1 F)
-21.7 C (-7.1 F)
n/a
n/a
Apr
31.1 C (88.0 F)
-15.0 C (5.0 F)
n/a
n/a
May
34.4 C (93.9 F)
-3.9 C (25.0 F)
n/a
n/a
Jun
40.6 C (105.1 F)
3.9 C (39.0 F)
n/a
n/a
Jul
40.0 C (104.0 F)
4.4 C (39.9 F)
n/a
n/a
Aug
37.2 C (99.0 F)
3.3 C (37.9 F)
n/a
n/a
Sep
35.0 C (95.0 F)
-2.8 C (27.0 F)
n/a
n/a
Oct
32.2 C (90.0 F)
-5.6 C (21.9 F)
n/a
n/a
Nov
25.0 C (77.0 F)
-14.4 C (6.1 F)
n/a
n/a
Dec
21.1 C (70.0 F)
-30.0 C (-22.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Napoleon still stand. 1991 holds the most, with 62.
Standing records at Napoleon by the year they were set
Year set
Standing records
1962
26
1963
52
1964
47
1965
32
1966
41
1967
38
1968
45
1969
29
1970
31
1971
39
1972
29
1973
46
1974
28
1975
33
1976
41
1977
45
1978
23
1979
33
1980
22
1981
16
1982
34
1983
43
1984
55
1985
35
1986
48
1987
30
1988
55
1989
47
1990
46
1991
62
1992
27
1993
36
1994
24
1995
28
1996
17
2002
20
2003
18
2004
29
2005
23
2006
26
2007
38
2008
20
2009
7
Wettest Day of Each Month
Aug: 113.8 mm (4.5 in)
The wettest day on record for each calendar month at Napoleon. The most was 113.8 mm (4.5 in) on 18 August 1979.
Record daily precipitation for each month at Napoleon
Month
Record daily precipitation (mm)
Date
Jan
39.4 mm (1.6 in)
3 January 1999
Feb
53.8 mm (2.1 in)
12 February 2009
Mar
52.6 mm (2.1 in)
11 March 2009
Apr
63.8 mm (2.5 in)
21 April 2000
May
66.8 mm (2.6 in)
16 May 1968
Jun
69.3 mm (2.7 in)
4 June 2007
Jul
84.8 mm (3.3 in)
31 July 1988
Aug
113.8 mm (4.5 in)
18 August 1979
Sep
62.2 mm (2.4 in)
13 September 2008
Oct
74.4 mm (2.9 in)
26 October 1991
Nov
71.4 mm (2.8 in)
9 November 1966
Dec
95.0 mm (3.7 in)
8 December 1966
Period of Record Coverage
1962 to 2009
Complete yearUnder 90 percent of days
43 years of record at Napoleon, 1962 to 2009. 4 years have data for under 90 percent of days and are left out of rankings: 1962, 1996, 2002, 2009.
Cooler than the station meanWarmer than the station mean
One stripe for each of 35 complete years at Napoleon, 1963 to 2008. Blue stripes are years cooler than the station's own mean of 10.1 C (50.1 F); red stripes are warmer. The coolest year was 1984, at 9.1 C (48.4 F), and the warmest was 1973, at 11.6 C (52.9 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at Napoleon as warming stripes, 1963 to 2008
Year
Annual mean temperature
Difference from the station mean
1963
9.6 C
-0.48 C
1964
10.8 C
+0.75 C
1965
10.2 C
+0.14 C
1966
9.9 C
-0.22 C
1967
10.0 C
-0.08 C
1968
10.7 C
+0.62 C
1969
10.3 C
+0.18 C
1970
10.6 C
+0.55 C
1971
10.9 C
+0.81 C
1972
9.9 C
-0.14 C
1973
11.6 C
+1.52 C
1974
10.4 C
+0.35 C
1975
10.8 C
+0.73 C
1976
9.9 C
-0.21 C
1977
10.2 C
+0.12 C
1978
9.5 C
-0.57 C
1979
9.5 C
-0.54 C
1980
9.8 C
-0.25 C
1981
10.1 C
-0.02 C
1982
9.6 C
-0.51 C
1983
9.7 C
-0.37 C
1984
9.1 C
-0.99 C
1985
9.2 C
-0.92 C
1986
9.6 C
-0.53 C
1987
10.4 C
+0.30 C
1990
10.4 C
+0.35 C
1991
10.6 C
+0.53 C
1992
9.2 C
-0.89 C
1994
9.2 C
-0.88 C
2003
9.6 C
-0.51 C
2004
9.9 C
-0.19 C
2005
10.2 C
+0.07 C
2006
11.2 C
+1.11 C
2007
10.5 C
+0.43 C
2008
9.7 C
-0.41 C
The fitted trend in annual mean temperature here over 1963 to 2008 is -0.1 C (-0.2 to 0.1) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.4 to 0.1) per decade. The slope is a straight line fitted to 35 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Napoleon
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.1 C (-0.2 to 0.1) per decade
-0.1 F (-0.4 to 0.1) per decade
1963 to 2008
35
Not clearly different from zero
Mean daily maximum
-0.16 C (-0.31 to -0.01) per decade
-0.28 F (-0.55 to -0.01) per decade
1963 to 2008
35
Fall
Mean daily minimum
0.00 C (-0.20 to 0.21) per decade
0.01 F (-0.37 to 0.38) per decade
1963 to 2008
35
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
1962 to 2009
Yearly extremes at Napoleon: 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)
1988
35.0 C (95.0 F)
43
Coldest night (TNn)
-31.1 C (-24.0 F)
1984
-22.8 C (-9.0 F)
43
Wettest day (Rx1day)
113.8 mm (4.5 in)
1979
55.4 mm (2.2 in)
47
Wettest five days (Rx5day)
175.3 mm (6.9 in)
2007
83.8 mm (3.3 in)
47
Longest dry spell (CDD)
35 days
1995
18 days
47
Hottest day (TXx)
The hottest day of the year at Napoleon, 1962 to 2009. The record is 40.6 C (105.1 F) in 1988, marked on the chart; the median year is 35.0 C (95.0 F).
Hottest day (TXx) at Napoleon by year
Year
Hottest day (TXx)
1962
34.4 C (93.9 F)
1963
35.6 C (96.1 F)
1964
37.2 C (99.0 F)
1965
35.0 C (95.0 F)
1966
36.1 C (97.0 F)
1967
35.6 C (96.1 F)
1968
34.4 C (93.9 F)
1969
34.4 C (93.9 F)
1970
37.2 C (99.0 F)
1971
36.7 C (98.1 F)
1972
34.4 C (93.9 F)
1973
35.0 C (95.0 F)
1974
37.2 C (99.0 F)
1975
35.0 C (95.0 F)
1976
36.1 C (97.0 F)
1977
36.7 C (98.1 F)
1978
35.0 C (95.0 F)
1979
32.8 C (91.0 F)
1980
36.7 C (98.1 F)
1981
34.4 C (93.9 F)
1982
33.3 C (91.9 F)
1983
37.2 C (99.0 F)
1984
34.4 C (93.9 F)
1985
33.3 C (91.9 F)
1986
33.9 C (93.0 F)
1987
36.7 C (98.1 F)
1988
40.6 C (105.1 F)
1989
36.7 C (98.1 F)
1990
37.8 C (100.0 F)
1991
35.6 C (96.1 F)
1992
33.9 C (93.0 F)
1993
34.4 C (93.9 F)
1994
36.1 C (97.0 F)
1995
37.2 C (99.0 F)
1996
32.8 C (91.0 F)
1998
n/a
1999
n/a
2000
n/a
2001
n/a
2002
35.0 C (95.0 F)
2003
33.3 C (91.9 F)
2004
32.8 C (91.0 F)
2005
36.7 C (98.1 F)
2006
35.0 C (95.0 F)
2007
35.0 C (95.0 F)
2008
35.0 C (95.0 F)
2009
29.4 C (84.9 F)
Coldest night (TNn)
The coldest night of the year at Napoleon, 1962 to 2009. The record is -31.1 C (-24.0 F) in 1984, marked on the chart; the median year is -22.8 C (-9.0 F).
Coldest night (TNn) at Napoleon by year
Year
Coldest night (TNn)
1962
-21.7 C (-7.1 F)
1963
-27.2 C (-17.0 F)
1964
-18.3 C (-0.9 F)
1965
-20.6 C (-5.1 F)
1966
-22.8 C (-9.0 F)
1967
-20.6 C (-5.1 F)
1968
-23.9 C (-11.0 F)
1969
-20.6 C (-5.1 F)
1970
-23.3 C (-9.9 F)
1971
-21.7 C (-7.1 F)
1972
-27.2 C (-17.0 F)
1973
-22.8 C (-9.0 F)
1974
-19.4 C (-2.9 F)
1975
-23.3 C (-9.9 F)
1976
-23.3 C (-9.9 F)
1977
-27.2 C (-17.0 F)
1978
-21.7 C (-7.1 F)
1979
-22.8 C (-9.0 F)
1980
-18.3 C (-0.9 F)
1981
-24.4 C (-11.9 F)
1982
-26.7 C (-16.1 F)
1983
-27.8 C (-18.0 F)
1984
-31.1 C (-24.0 F)
1985
-27.2 C (-17.0 F)
1986
-20.6 C (-5.1 F)
1987
-22.2 C (-8.0 F)
1988
-21.1 C (-6.0 F)
1989
-30.0 C (-22.0 F)
1990
-18.9 C (-2.0 F)
1991
-20.0 C (-4.0 F)
1992
-22.8 C (-9.0 F)
1993
-23.9 C (-11.0 F)
1994
-29.4 C (-20.9 F)
1995
-19.4 C (-2.9 F)
1996
-22.8 C (-9.0 F)
1998
n/a
1999
n/a
2000
n/a
2001
n/a
2002
-16.7 C (1.9 F)
2003
-23.3 C (-9.9 F)
2004
-23.3 C (-9.9 F)
2005
-19.4 C (-2.9 F)
2006
-15.0 C (5.0 F)
2007
-21.1 C (-6.0 F)
2008
-19.4 C (-2.9 F)
2009
-26.1 C (-15.0 F)
Wettest day (Rx1day)
The wettest day of the year at Napoleon, 1962 to 2009. The record is 113.8 mm (4.5 in) in 1979, marked on the chart; the median year is 55.4 mm (2.2 in).
Wettest day (Rx1day) at Napoleon by year
Year
Wettest day (Rx1day)
1962
57.7 mm (2.3 in)
1963
33.5 mm (1.3 in)
1964
46.2 mm (1.8 in)
1965
54.4 mm (2.1 in)
1966
95.0 mm (3.7 in)
1967
37.6 mm (1.5 in)
1968
66.8 mm (2.6 in)
1969
48.0 mm (1.9 in)
1970
68.1 mm (2.7 in)
1971
49.8 mm (2.0 in)
1972
47.2 mm (1.9 in)
1973
32.0 mm (1.3 in)
1974
38.1 mm (1.5 in)
1975
112.8 mm (4.4 in)
1976
39.9 mm (1.6 in)
1977
87.1 mm (3.4 in)
1978
55.4 mm (2.2 in)
1979
113.8 mm (4.5 in)
1980
53.1 mm (2.1 in)
1981
64.0 mm (2.5 in)
1982
50.8 mm (2.0 in)
1983
45.7 mm (1.8 in)
1984
62.0 mm (2.4 in)
1985
63.2 mm (2.5 in)
1986
81.8 mm (3.2 in)
1987
58.4 mm (2.3 in)
1988
84.8 mm (3.3 in)
1989
62.7 mm (2.5 in)
1990
47.8 mm (1.9 in)
1991
74.4 mm (2.9 in)
1992
53.3 mm (2.1 in)
1993
37.3 mm (1.5 in)
1994
29.2 mm (1.1 in)
1995
36.3 mm (1.4 in)
1996
57.9 mm (2.3 in)
1998
15.0 mm (0.6 in)
1999
51.6 mm (2.0 in)
2000
63.8 mm (2.5 in)
2001
53.3 mm (2.1 in)
2002
56.4 mm (2.2 in)
2003
73.4 mm (2.9 in)
2004
38.4 mm (1.5 in)
2005
59.2 mm (2.3 in)
2006
56.6 mm (2.2 in)
2007
85.9 mm (3.4 in)
2008
63.5 mm (2.5 in)
2009
53.8 mm (2.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Napoleon, 1962 to 2009. The record is 175.3 mm (6.9 in) in 2007, marked on the chart; the median year is 83.8 mm (3.3 in).
Wettest five days (Rx5day) at Napoleon by year
Year
Wettest five days (Rx5day)
1962
59.5 mm (2.3 in)
1963
62.2 mm (2.4 in)
1964
61.4 mm (2.4 in)
1965
87.7 mm (3.5 in)
1966
144.0 mm (5.7 in)
1967
54.0 mm (2.1 in)
1968
98.0 mm (3.9 in)
1969
74.2 mm (2.9 in)
1970
98.1 mm (3.9 in)
1971
50.6 mm (2.0 in)
1972
76.5 mm (3.0 in)
1973
63.5 mm (2.5 in)
1974
59.9 mm (2.4 in)
1975
122.2 mm (4.8 in)
1976
70.1 mm (2.8 in)
1977
109.5 mm (4.3 in)
1978
64.5 mm (2.5 in)
1979
118.6 mm (4.7 in)
1980
68.3 mm (2.7 in)
1981
98.3 mm (3.9 in)
1982
70.9 mm (2.8 in)
1983
83.8 mm (3.3 in)
1984
94.5 mm (3.7 in)
1985
87.1 mm (3.4 in)
1986
83.8 mm (3.3 in)
1987
69.8 mm (2.7 in)
1988
84.8 mm (3.3 in)
1989
109.7 mm (4.3 in)
1990
78.5 mm (3.1 in)
1991
106.7 mm (4.2 in)
1992
96.8 mm (3.8 in)
1993
62.2 mm (2.4 in)
1994
64.5 mm (2.5 in)
1995
70.4 mm (2.8 in)
1996
81.3 mm (3.2 in)
1998
25.9 mm (1.0 in)
1999
81.4 mm (3.2 in)
2000
116.4 mm (4.6 in)
2001
74.5 mm (2.9 in)
2002
108.0 mm (4.3 in)
2003
103.4 mm (4.1 in)
2004
89.2 mm (3.5 in)
2005
96.0 mm (3.8 in)
2006
113.6 mm (4.5 in)
2007
175.3 mm (6.9 in)
2008
116.1 mm (4.6 in)
2009
106.0 mm (4.2 in)
Longest dry spell (CDD)
The longest dry spell of the year at Napoleon, 1962 to 2009. The record is 35 days in 1995, marked on the chart; the median year is 18 days.
Longest dry spell (CDD) at Napoleon by year
Year
Longest dry spell (CDD)
1962
19 days
1963
32 days
1964
17 days
1965
14 days
1966
20 days
1967
24 days
1968
25 days
1969
29 days
1970
21 days
1971
21 days
1972
13 days
1973
13 days
1974
17 days
1975
15 days
1976
25 days
1977
17 days
1978
15 days
1979
18 days
1980
20 days
1981
19 days
1982
12 days
1983
26 days
1984
15 days
1985
15 days
1986
15 days
1987
28 days
1988
19 days
1989
16 days
1990
13 days
1991
15 days
1992
13 days
1993
14 days
1994
17 days
1995
35 days
1996
17 days
1998
20 days
1999
21 days
2000
13 days
2001
26 days
2002
13 days
2003
11 days
2004
21 days
2005
21 days
2006
19 days
2007
24 days
2008
20 days
2009
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
35 years with a frost
Across 35 years with a frost, the median last spring frost at Napoleon falls on 30 April and the median first autumn frost on 17 October, which leaves a median of 171 days between them.
Fitted over all years, the growing season changes by +1.8 days per decade at this station.
Frost dates and growing season at Napoleon
Measure
Median, all years
Earliest period
Recent period (1968 to 2008)
Recent against earliest
Fitted trend
Last spring frost
30 April
n/a
1 May
n/a
-1.0 days per decade
First autumn frost
17 October
n/a
17 October
n/a
+0.8 days per decade
Growing days
171 days
n/a
171 days
n/a
+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
42 years, 1963 to 2008
A day with at least 55.8 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 125.1 mm (4.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Napoleon: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
55.8 mm (2.2 in)
5 years
73.6 mm (2.9 in)
10 years
85.7 mm (3.4 in)
25 years
101.3 mm (4.0 in)
50 years
113.1 mm (4.5 in)
Longer than the 42 years of record
100 years
125.1 mm (4.9 in)
Longer than the 42 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, 42 years of values from 1963 to 2008.
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: 113.8 mm (4.5 in) in 1979; 112.8 mm (4.4 in) in 1975; 95.0 mm (3.7 in) in 1966.
Download the Data
Data for Napoleon standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Napoleon 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.