Record envelope, standing records and threshold days for Napoleon (USC00335664), Ohio, United States, with 70 years of record.
Key Facts for Napoleon
Napoleon (USC00335664) is a weather station in Ohio, United States at 41.38 latitude and -84.12 longitude, 207 m (679 ft) above sea level.
The station reports from 1893 to 1962, 70 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 high minimum temperature of 19.4 C (66.9 F) on 19 May 1962.
About the Station
Location: Ohio, United States, 41.38 latitude, -84.12 longitude.
Elevation: 207 m (679 ft).
Period of record: 1893 to 1962, 70 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
22.2 C (72.0 F)
-28.3 C (-18.9 F)
n/a
n/a
Feb
21.7 C (71.1 F)
-30.0 C (-22.0 F)
n/a
n/a
Mar
35.6 C (96.1 F)
-22.8 C (-9.0 F)
n/a
n/a
Apr
32.2 C (90.0 F)
-11.7 C (10.9 F)
n/a
n/a
May
37.2 C (99.0 F)
-3.3 C (26.1 F)
n/a
n/a
Jun
40.6 C (105.1 F)
2.2 C (36.0 F)
n/a
n/a
Jul
43.3 C (109.9 F)
5.0 C (41.0 F)
n/a
n/a
Aug
43.9 C (111.0 F)
2.2 C (36.0 F)
n/a
n/a
Sep
40.6 C (105.1 F)
-4.4 C (24.1 F)
n/a
n/a
Oct
34.4 C (93.9 F)
-10.0 C (14.0 F)
n/a
n/a
Nov
26.7 C (80.1 F)
-17.8 C (0.0 F)
n/a
n/a
Dec
19.4 C (66.9 F)
-29.4 C (-20.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Napoleon still stand. 1895 holds the most, with 50.
Standing records at Napoleon by the year they were set
Year set
Standing records
1893
13
1894
37
1895
50
1896
40
1897
34
1898
22
1899
36
1900
25
1901
18
1902
21
1903
21
1904
17
1905
17
1906
23
1907
21
1908
16
1909
18
1910
16
1911
34
1912
26
1913
22
1914
26
1915
32
1916
17
1917
26
1918
27
1919
15
1920
20
1921
19
1922
10
1923
18
1924
20
1925
30
1926
14
1927
18
1928
24
1929
26
1930
34
1931
18
1932
21
1933
22
1934
26
1935
14
1936
35
1937
9
1938
10
1939
11
1940
18
1941
22
1942
14
1943
18
1944
23
1945
26
1946
27
1947
26
1948
11
1949
12
1950
28
1951
30
1952
12
1953
26
1954
15
1955
9
1956
9
1957
10
1958
9
1959
17
1960
18
1961
5
1962
10
All-Time Record Progression
5 new records
5 all-time records were set at Napoleon between 20 July 1930 and 6 August 1947. Each dot is a new record.
When Napoleon set new all-time records
Date
Kind
Detail
1930-07-20
Record high maximum temperature
Record high maximum temperature 41.1 C (106.0 F)
1934-07-24
Record high maximum temperature
Record high maximum temperature 42.2 C (108.0 F)
1936-07-14
Record high maximum temperature
Record high maximum temperature 43.3 C (109.9 F)
1943-06-25
Record high minimum temperature
Record high minimum temperature 30.0 C (86.0 F)
1947-08-06
Record high maximum temperature
Record high maximum temperature 43.9 C (111.0 F)
Wettest Day of Each Month
Aug: 117.6 mm (4.6 in)
The wettest day on record for each calendar month at Napoleon. The most was 117.6 mm (4.6 in) on 17 August 1920.
Record daily precipitation for each month at Napoleon
Month
Record daily precipitation (mm)
Date
Jan
50.8 mm (2.0 in)
30 January 1947
Feb
53.1 mm (2.1 in)
29 February 1904
Mar
65.3 mm (2.6 in)
23 March 1913
Apr
82.6 mm (3.3 in)
29 April 1956
May
64.5 mm (2.5 in)
26 May 1913
Jun
110.0 mm (4.3 in)
28 June 1894
Jul
80.5 mm (3.2 in)
24 July 1908
Aug
117.6 mm (4.6 in)
17 August 1920
Sep
89.4 mm (3.5 in)
1 September 1950
Oct
70.6 mm (2.8 in)
22 October 1929
Nov
44.5 mm (1.8 in)
22 November 1909
Dec
38.6 mm (1.5 in)
14 December 1928
Period of Record Coverage
1893 to 1962
Complete yearUnder 90 percent of days
70 years of record at Napoleon, 1893 to 1962. 3 years have data for under 90 percent of days and are left out of rankings: 1893, 1898, 1962.
Cooler than the station meanWarmer than the station mean
One stripe for each of 63 complete years at Napoleon, 1895 to 1961. Blue stripes are years cooler than the station's own mean of 10.1 C (50.2 F); red stripes are warmer. The coolest year was 1917, at 8.0 C (46.4 F), and the warmest was 1921, at 11.9 C (53.4 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Napoleon as warming stripes, 1895 to 1961
Year
Annual mean temperature
Difference from the station mean
1895
9.0 C
-1.12 C
1899
9.4 C
-0.75 C
1900
10.6 C
+0.44 C
1901
9.8 C
-0.34 C
1902
10.3 C
+0.22 C
1903
9.8 C
-0.35 C
1904
8.5 C
-1.62 C
1905
9.7 C
-0.43 C
1906
10.6 C
+0.43 C
1907
9.6 C
-0.54 C
1908
10.9 C
+0.74 C
1909
10.1 C
-0.02 C
1910
10.2 C
+0.11 C
1911
11.1 C
+0.94 C
1912
8.9 C
-1.23 C
1913
10.4 C
+0.25 C
1914
9.6 C
-0.54 C
1915
9.4 C
-0.74 C
1916
9.6 C
-0.48 C
1917
8.0 C
-2.10 C
1918
10.3 C
+0.16 C
1919
10.3 C
+0.21 C
1920
9.4 C
-0.69 C
1921
11.9 C
+1.79 C
1922
10.5 C
+0.36 C
1923
9.6 C
-0.48 C
1924
8.3 C
-1.85 C
1925
9.4 C
-0.73 C
1926
8.6 C
-1.52 C
1927
10.0 C
-0.09 C
1928
9.8 C
-0.37 C
1929
9.2 C
-0.90 C
1930
10.4 C
+0.31 C
1931
11.6 C
+1.52 C
1932
10.3 C
+0.19 C
1933
10.8 C
+0.72 C
1934
10.2 C
+0.06 C
1935
9.7 C
-0.45 C
1936
9.8 C
-0.28 C
1937
9.8 C
-0.30 C
1938
11.3 C
+1.21 C
1939
10.9 C
+0.75 C
1940
9.2 C
-0.91 C
1941
11.1 C
+1.01 C
1942
10.5 C
+0.37 C
1943
9.9 C
-0.25 C
1944
10.8 C
+0.65 C
1945
10.1 C
+0.00 C
1946
11.6 C
+1.46 C
1947
10.3 C
+0.18 C
1948
10.4 C
+0.29 C
1950
9.3 C
-0.78 C
1951
10.0 C
-0.15 C
1952
11.1 C
+0.99 C
1953
11.7 C
+1.56 C
1954
11.2 C
+1.08 C
1955
11.2 C
+1.03 C
1956
10.6 C
+0.44 C
1957
10.4 C
+0.27 C
1958
9.6 C
-0.55 C
1959
10.7 C
+0.57 C
1960
9.9 C
-0.19 C
1961
10.3 C
+0.18 C
The annual mean temperature here has risen by 0.15 C (0.05 to 0.26) per decade over 1895 to 1961. In Fahrenheit: 0.3 F (0.1 to 0.5) per decade. The slope is a straight line fitted to 63 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
0.15 C (0.05 to 0.26) per decade
0.3 F (0.1 to 0.5) per decade
1895 to 1961
63
Rise
Mean daily maximum
0.2 C (0.1 to 0.3) per decade
0.4 F (0.2 to 0.6) per decade
1895 to 1961
63
Rise
Mean daily minimum
0.09 C (-0.02 to 0.19) per decade
0.16 F (-0.03 to 0.35) per decade
1895 to 1961
63
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
1893 to 1962
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)
43.9 C (111.0 F)
1947
36.7 C (98.1 F)
70
Coldest night (TNn)
-30.0 C (-22.0 F)
1899
-22.8 C (-9.0 F)
70
Wettest day (Rx1day)
117.6 mm (4.6 in)
1920
55.9 mm (2.2 in)
70
Wettest five days (Rx5day)
178.8 mm (7.0 in)
1926
82.8 mm (3.3 in)
70
Longest dry spell (CDD)
40 days
1914
18 days
70
Hottest day (TXx)
The hottest day of the year at Napoleon, 1893 to 1962. The record is 43.9 C (111.0 F) in 1947, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Napoleon by year
Year
Hottest day (TXx)
1893
35.0 C (95.0 F)
1894
37.8 C (100.0 F)
1895
38.9 C (102.0 F)
1896
36.1 C (97.0 F)
1897
40.0 C (104.0 F)
1898
37.2 C (99.0 F)
1899
36.1 C (97.0 F)
1900
33.9 C (93.0 F)
1901
36.1 C (97.0 F)
1902
33.9 C (93.0 F)
1903
33.9 C (93.0 F)
1904
33.3 C (91.9 F)
1905
33.9 C (93.0 F)
1906
35.0 C (95.0 F)
1907
35.6 C (96.1 F)
1908
35.6 C (96.1 F)
1909
34.4 C (93.9 F)
1910
35.0 C (95.0 F)
1911
37.8 C (100.0 F)
1912
35.6 C (96.1 F)
1913
37.8 C (100.0 F)
1914
37.8 C (100.0 F)
1915
35.0 C (95.0 F)
1916
38.3 C (100.9 F)
1917
36.7 C (98.1 F)
1918
40.6 C (105.1 F)
1919
38.3 C (100.9 F)
1920
36.7 C (98.1 F)
1921
37.8 C (100.0 F)
1922
35.0 C (95.0 F)
1923
35.6 C (96.1 F)
1924
35.0 C (95.0 F)
1925
36.7 C (98.1 F)
1926
35.0 C (95.0 F)
1927
35.6 C (96.1 F)
1928
34.4 C (93.9 F)
1929
33.9 C (93.0 F)
1930
41.1 C (106.0 F)
1931
37.2 C (99.0 F)
1932
37.8 C (100.0 F)
1933
39.4 C (102.9 F)
1934
42.2 C (108.0 F)
1935
36.1 C (97.0 F)
1936
43.3 C (109.9 F)
1937
35.6 C (96.1 F)
1938
34.4 C (93.9 F)
1939
37.8 C (100.0 F)
1940
37.2 C (99.0 F)
1941
40.6 C (105.1 F)
1942
37.2 C (99.0 F)
1943
37.2 C (99.0 F)
1944
40.6 C (105.1 F)
1945
37.2 C (99.0 F)
1946
36.7 C (98.1 F)
1947
43.9 C (111.0 F)
1948
38.9 C (102.0 F)
1949
36.1 C (97.0 F)
1950
35.0 C (95.0 F)
1951
41.1 C (106.0 F)
1952
40.6 C (105.1 F)
1953
40.6 C (105.1 F)
1954
37.8 C (100.0 F)
1955
39.4 C (102.9 F)
1956
36.7 C (98.1 F)
1957
35.6 C (96.1 F)
1958
33.3 C (91.9 F)
1959
36.7 C (98.1 F)
1960
36.1 C (97.0 F)
1961
35.0 C (95.0 F)
1962
34.4 C (93.9 F)
Coldest night (TNn)
The coldest night of the year at Napoleon, 1893 to 1962. The record is -30.0 C (-22.0 F) in 1899, 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)
1893
-12.8 C (9.0 F)
1894
-20.0 C (-4.0 F)
1895
-23.9 C (-11.0 F)
1896
-23.9 C (-11.0 F)
1897
-28.3 C (-18.9 F)
1898
-20.6 C (-5.1 F)
1899
-30.0 C (-22.0 F)
1900
-22.8 C (-9.0 F)
1901
-23.3 C (-9.9 F)
1902
-21.7 C (-7.1 F)
1903
-20.6 C (-5.1 F)
1904
-25.0 C (-13.0 F)
1905
-26.7 C (-16.1 F)
1906
-21.7 C (-7.1 F)
1907
-19.4 C (-2.9 F)
1908
-17.8 C (0.0 F)
1909
-21.7 C (-7.1 F)
1910
-18.9 C (-2.0 F)
1911
-16.7 C (1.9 F)
1912
-27.2 C (-17.0 F)
1913
-20.0 C (-4.0 F)
1914
-25.6 C (-14.1 F)
1915
-26.1 C (-15.0 F)
1916
-21.7 C (-7.1 F)
1917
-29.4 C (-20.9 F)
1918
-27.2 C (-17.0 F)
1919
-17.8 C (0.0 F)
1920
-22.8 C (-9.0 F)
1921
-16.1 C (3.0 F)
1922
-27.8 C (-18.0 F)
1923
-16.7 C (1.9 F)
1924
-25.0 C (-13.0 F)
1925
-22.8 C (-9.0 F)
1926
-21.7 C (-7.1 F)
1927
-22.8 C (-9.0 F)
1928
-20.0 C (-4.0 F)
1929
-28.9 C (-20.0 F)
1930
-25.6 C (-14.1 F)
1931
-11.7 C (10.9 F)
1932
-21.1 C (-6.0 F)
1933
-24.4 C (-11.9 F)
1934
-28.9 C (-20.0 F)
1935
-20.0 C (-4.0 F)
1936
-28.3 C (-18.9 F)
1937
-20.6 C (-5.1 F)
1938
-18.3 C (-0.9 F)
1939
-17.8 C (0.0 F)
1940
-27.2 C (-17.0 F)
1941
-15.0 C (5.0 F)
1942
-25.0 C (-13.0 F)
1943
-22.8 C (-9.0 F)
1944
-27.2 C (-17.0 F)
1945
-23.3 C (-9.9 F)
1946
-20.6 C (-5.1 F)
1947
-19.4 C (-2.9 F)
1948
-22.8 C (-9.0 F)
1949
-17.2 C (1.0 F)
1950
-27.8 C (-18.0 F)
1951
-27.2 C (-17.0 F)
1952
-14.4 C (6.1 F)
1953
-19.4 C (-2.9 F)
1954
-16.7 C (1.9 F)
1955
-21.1 C (-6.0 F)
1956
-21.1 C (-6.0 F)
1957
-22.8 C (-9.0 F)
1958
-22.8 C (-9.0 F)
1959
-22.2 C (-8.0 F)
1960
-23.9 C (-11.0 F)
1961
-22.8 C (-9.0 F)
1962
-23.3 C (-9.9 F)
Wettest day (Rx1day)
The wettest day of the year at Napoleon, 1893 to 1962. The record is 117.6 mm (4.6 in) in 1920, marked on the chart; the median year is 55.9 mm (2.2 in).
Wettest day (Rx1day) at Napoleon by year
Year
Wettest day (Rx1day)
1893
57.2 mm (2.3 in)
1894
110.0 mm (4.3 in)
1895
36.1 mm (1.4 in)
1896
64.8 mm (2.6 in)
1897
38.1 mm (1.5 in)
1898
41.9 mm (1.6 in)
1899
58.7 mm (2.3 in)
1900
62.7 mm (2.5 in)
1901
45.7 mm (1.8 in)
1902
55.9 mm (2.2 in)
1903
66.0 mm (2.6 in)
1904
53.1 mm (2.1 in)
1905
60.5 mm (2.4 in)
1906
35.6 mm (1.4 in)
1907
38.9 mm (1.5 in)
1908
80.5 mm (3.2 in)
1909
50.8 mm (2.0 in)
1910
56.1 mm (2.2 in)
1911
45.7 mm (1.8 in)
1912
46.7 mm (1.8 in)
1913
65.3 mm (2.6 in)
1914
62.5 mm (2.5 in)
1915
46.2 mm (1.8 in)
1916
40.9 mm (1.6 in)
1917
58.7 mm (2.3 in)
1918
61.0 mm (2.4 in)
1919
69.9 mm (2.8 in)
1920
117.6 mm (4.6 in)
1921
33.0 mm (1.3 in)
1922
69.9 mm (2.8 in)
1923
47.0 mm (1.9 in)
1924
33.0 mm (1.3 in)
1925
36.6 mm (1.4 in)
1926
81.8 mm (3.2 in)
1927
49.5 mm (1.9 in)
1928
38.6 mm (1.5 in)
1929
70.6 mm (2.8 in)
1930
76.7 mm (3.0 in)
1931
50.8 mm (2.0 in)
1932
59.7 mm (2.4 in)
1933
62.7 mm (2.5 in)
1934
64.0 mm (2.5 in)
1935
30.5 mm (1.2 in)
1936
34.3 mm (1.4 in)
1937
108.0 mm (4.3 in)
1938
67.3 mm (2.6 in)
1939
67.8 mm (2.7 in)
1940
41.7 mm (1.6 in)
1941
25.9 mm (1.0 in)
1942
76.7 mm (3.0 in)
1943
39.4 mm (1.6 in)
1944
40.1 mm (1.6 in)
1945
56.1 mm (2.2 in)
1946
60.2 mm (2.4 in)
1947
50.8 mm (2.0 in)
1948
58.4 mm (2.3 in)
1949
63.0 mm (2.5 in)
1950
92.5 mm (3.6 in)
1951
43.9 mm (1.7 in)
1952
42.7 mm (1.7 in)
1953
55.9 mm (2.2 in)
1954
54.6 mm (2.1 in)
1955
40.6 mm (1.6 in)
1956
82.6 mm (3.3 in)
1957
88.9 mm (3.5 in)
1958
54.6 mm (2.1 in)
1959
57.2 mm (2.3 in)
1960
32.3 mm (1.3 in)
1961
32.5 mm (1.3 in)
1962
20.8 mm (0.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Napoleon, 1893 to 1962. The record is 178.8 mm (7.0 in) in 1926, marked on the chart; the median year is 82.8 mm (3.3 in).
Wettest five days (Rx5day) at Napoleon by year
Year
Wettest five days (Rx5day)
1893
58.4 mm (2.3 in)
1894
47.6 mm (1.9 in)
1895
34.5 mm (1.4 in)
1896
68.6 mm (2.7 in)
1897
31.5 mm (1.2 in)
1898
48.7 mm (1.9 in)
1899
70.1 mm (2.8 in)
1900
69.6 mm (2.7 in)
1901
87.6 mm (3.4 in)
1902
96.3 mm (3.8 in)
1903
92.5 mm (3.6 in)
1904
101.8 mm (4.0 in)
1905
124.9 mm (4.9 in)
1906
69.6 mm (2.7 in)
1907
79.9 mm (3.1 in)
1908
103.1 mm (4.1 in)
1909
73.1 mm (2.9 in)
1910
89.1 mm (3.5 in)
1911
83.3 mm (3.3 in)
1912
66.8 mm (2.6 in)
1913
121.2 mm (4.8 in)
1914
120.2 mm (4.7 in)
1915
71.1 mm (2.8 in)
1916
60.1 mm (2.4 in)
1917
88.7 mm (3.5 in)
1918
117.9 mm (4.6 in)
1919
94.5 mm (3.7 in)
1920
176.0 mm (6.9 in)
1921
60.5 mm (2.4 in)
1922
112.6 mm (4.4 in)
1923
93.1 mm (3.7 in)
1924
62.8 mm (2.5 in)
1925
82.5 mm (3.2 in)
1926
178.8 mm (7.0 in)
1927
72.1 mm (2.8 in)
1928
86.4 mm (3.4 in)
1929
132.1 mm (5.2 in)
1930
99.1 mm (3.9 in)
1931
58.5 mm (2.3 in)
1932
75.4 mm (3.0 in)
1933
73.1 mm (2.9 in)
1934
66.8 mm (2.6 in)
1935
46.5 mm (1.8 in)
1936
70.6 mm (2.8 in)
1937
121.1 mm (4.8 in)
1938
115.8 mm (4.6 in)
1939
81.0 mm (3.2 in)
1940
83.0 mm (3.3 in)
1941
85.3 mm (3.4 in)
1942
97.0 mm (3.8 in)
1943
98.9 mm (3.9 in)
1944
104.6 mm (4.1 in)
1945
144.0 mm (5.7 in)
1946
67.6 mm (2.7 in)
1947
80.8 mm (3.2 in)
1948
64.5 mm (2.5 in)
1949
81.9 mm (3.2 in)
1950
109.0 mm (4.3 in)
1951
78.7 mm (3.1 in)
1952
69.9 mm (2.8 in)
1953
83.2 mm (3.3 in)
1954
64.8 mm (2.6 in)
1955
89.7 mm (3.5 in)
1956
91.2 mm (3.6 in)
1957
96.0 mm (3.8 in)
1958
130.0 mm (5.1 in)
1959
91.7 mm (3.6 in)
1960
59.7 mm (2.4 in)
1961
65.5 mm (2.6 in)
1962
38.4 mm (1.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Napoleon, 1893 to 1962. The record is 40 days in 1914, marked on the chart; the median year is 18 days.
Longest dry spell (CDD) at Napoleon by year
Year
Longest dry spell (CDD)
1893
2 days
1894
2 days
1895
22 days
1896
9 days
1897
11 days
1898
15 days
1899
37 days
1900
26 days
1901
26 days
1902
19 days
1903
19 days
1904
28 days
1905
18 days
1906
15 days
1907
17 days
1908
39 days
1909
12 days
1910
20 days
1911
15 days
1912
18 days
1913
21 days
1914
40 days
1915
24 days
1916
19 days
1917
22 days
1918
19 days
1919
21 days
1920
34 days
1921
15 days
1922
16 days
1923
22 days
1924
23 days
1925
32 days
1926
16 days
1927
18 days
1928
15 days
1929
13 days
1930
28 days
1931
17 days
1932
18 days
1933
19 days
1934
20 days
1935
15 days
1936
28 days
1937
19 days
1938
17 days
1939
14 days
1940
15 days
1941
16 days
1942
29 days
1943
25 days
1944
29 days
1945
15 days
1946
16 days
1947
18 days
1948
17 days
1949
21 days
1950
14 days
1951
16 days
1952
25 days
1953
27 days
1954
19 days
1955
16 days
1956
16 days
1957
22 days
1958
19 days
1959
12 days
1960
17 days
1961
16 days
1962
12 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
63 years with a frost
Across 63 years with a frost, the median last spring frost at Napoleon falls on 2 May and the median first autumn frost on 12 October, which leaves a median of 162 days between them.
In 1931 to 1961 the median growing season was 161 days. That is 5 days fewer than in 1895 to 1927.
Fitted over all years, the growing season changes by -0.7 days per decade at this station.
Frost dates and growing season at Napoleon
Measure
Median, all years
Earliest period (1895 to 1927)
Recent period (1931 to 1961)
Recent against earliest
Fitted trend
Last spring frost
2 May
4 May
2 May
2 days earlier
+0.3 days per decade
First autumn frost
12 October
13 October
12 October
1 day earlier
-0.5 days per decade
Growing days
162 days
166 days
161 days
5 days fewer
-0.7 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
63 years, 1899 to 1961
A day with at least 53.8 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 111.4 mm (4.4 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
53.8 mm (2.1 in)
5 years
70.2 mm (2.8 in)
10 years
80.6 mm (3.2 in)
25 years
93.4 mm (3.7 in)
50 years
102.5 mm (4.0 in)
100 years
111.4 mm (4.4 in)
Longer than the 63 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, 63 years of values from 1899 to 1961.
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: 117.6 mm (4.6 in) in 1920; 108.0 mm (4.3 in) in 1937; 92.5 mm (3.6 in) in 1950.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
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.