Record envelope, standing records and threshold days for Hanover (USC00363662), Pennsylvania, United States, with 90 years of record.
Key Facts for Hanover
Hanover (USC00363662) is a weather station in Pennsylvania, United States at 39.80 latitude and -76.98 longitude, 183 m (600 ft) above sea level.
The station reports from 1904 to 1993, 90 years of record.
1,464 records set at Hanover still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Hanover tied a daily record high maximum temperature of 33.3 C (91.9 F) on 12 May 1993.
About the Station
Location: Pennsylvania, United States, 39.80 latitude, -76.98 longitude.
Elevation: 183 m (600 ft).
Period of record: 1904 to 1993, 90 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 Hanover. 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 Hanover, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
26.1 C (79.0 F)
-26.7 C (-16.1 F)
n/a
n/a
Feb
26.1 C (79.0 F)
-23.3 C (-9.9 F)
n/a
n/a
Mar
30.0 C (86.0 F)
-16.1 C (3.0 F)
n/a
n/a
Apr
35.6 C (96.1 F)
-12.2 C (10.0 F)
n/a
n/a
May
37.8 C (100.0 F)
-1.7 C (28.9 F)
n/a
n/a
Jun
40.6 C (105.1 F)
3.3 C (37.9 F)
n/a
n/a
Jul
40.6 C (105.1 F)
6.1 C (43.0 F)
n/a
n/a
Aug
40.6 C (105.1 F)
5.0 C (41.0 F)
n/a
n/a
Sep
38.9 C (102.0 F)
-0.6 C (30.9 F)
n/a
n/a
Oct
34.4 C (93.9 F)
-6.7 C (19.9 F)
n/a
n/a
Nov
28.9 C (84.0 F)
-13.3 C (8.1 F)
n/a
n/a
Dec
25.0 C (77.0 F)
-22.2 C (-8.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Hanover still stand. 1930 holds the most, with 42.
Standing records at Hanover by the year they were set
Year set
Standing records
1904
21
1905
17
1906
15
1907
8
1908
16
1909
21
1910
10
1911
21
1912
10
1913
18
1914
26
1915
16
1916
22
1917
27
1918
31
1919
13
1920
14
1921
19
1922
17
1923
17
1924
8
1925
20
1926
27
1927
21
1928
14
1929
24
1930
42
1931
27
1932
21
1933
15
1934
22
1935
16
1936
18
1937
9
1938
15
1939
15
1940
14
1941
15
1942
14
1943
14
1944
6
1945
18
1946
12
1947
17
1948
12
1949
9
1950
25
1951
19
1952
7
1953
17
1954
14
1955
5
1956
17
1957
7
1958
11
1959
11
1960
19
1961
11
1962
9
1963
29
1964
16
1965
10
1966
16
1967
15
1968
13
1969
7
1970
14
1971
12
1972
19
1973
5
1974
18
1975
13
1976
36
1977
15
1978
6
1979
24
1980
14
1981
11
1982
23
1983
15
1984
16
1985
15
1986
12
1987
15
1988
30
1989
22
1990
25
1991
12
1992
4
1993
6
All-Time Record Progression
6 new records
6 all-time records were set at Hanover between 22 June 1972 and 12 February 1983. Each dot is a new record.
When Hanover set new all-time records
Date
Kind
Detail
1972-06-22
Record daily precipitation
Record daily precipitation 154.9 mm (6.1 in)
1982-01-11
Record low maximum temperature
Record low maximum temperature -14.4 C (6.1 F)
1982-01-17
Record low minimum temperature
Record low minimum temperature -26.7 C (-16.1 F)
1982-01-18
Record low maximum temperature
Record low maximum temperature -15.6 C (3.9 F)
1983-02-12
Record daily snowfall
Record daily snowfall 61.0 cm (24.0 in)
1983-02-12
Record snow depth
Record snow depth 66.0 cm (26.0 in)
Wettest Day of Each Month
Jun: 154.9 mm (6.1 in)
The wettest day on record for each calendar month at Hanover. The most was 154.9 mm (6.1 in) on 22 June 1972.
Record daily precipitation for each month at Hanover
Month
Record daily precipitation (mm)
Date
Jan
62.2 mm (2.4 in)
4 January 1944
Feb
47.8 mm (1.9 in)
24 February 1984
Mar
63.0 mm (2.5 in)
29 March 1942
Apr
69.1 mm (2.7 in)
16 April 1929
May
100.3 mm (3.9 in)
18 May 1988
Jun
154.9 mm (6.1 in)
22 June 1972
Jul
102.4 mm (4.0 in)
18 July 1940
Aug
108.7 mm (4.3 in)
25 August 1905
Sep
140.2 mm (5.5 in)
26 September 1975
Oct
90.7 mm (3.6 in)
2 October 1929
Nov
72.4 mm (2.9 in)
25 November 1971
Dec
71.4 mm (2.8 in)
7 December 1953
Period of Record Coverage
1904 to 1993
Complete yearUnder 90 percent of days
90 years of record at Hanover, 1904 to 1993. 8 years have data for under 90 percent of days and are left out of rankings: 1904, 1906, 1907, 1928, 1990, 1991, 1992, 1993.
Cooler than the station meanWarmer than the station mean
One stripe for each of 76 complete years at Hanover, 1905 to 1988. Blue stripes are years cooler than the station's own mean of 11.9 C (53.5 F); red stripes are warmer. The coolest year was 1917, at 10.4 C (50.6 F), and the warmest was 1931, at 13.9 C (57.0 F). The strongest colour marks a difference of 2.0 C (3.6 F).
Annual mean temperature at Hanover as warming stripes, 1905 to 1988
Year
Annual mean temperature
Difference from the station mean
1905
11.7 C
-0.27 C
1908
12.7 C
+0.81 C
1909
12.7 C
+0.73 C
1910
12.6 C
+0.69 C
1911
12.9 C
+1.02 C
1912
11.6 C
-0.29 C
1913
13.0 C
+1.11 C
1914
11.5 C
-0.44 C
1915
11.8 C
-0.10 C
1916
11.6 C
-0.33 C
1917
10.4 C
-1.56 C
1918
12.1 C
+0.16 C
1919
12.3 C
+0.40 C
1921
13.5 C
+1.56 C
1922
12.5 C
+0.56 C
1923
12.0 C
+0.12 C
1924
11.0 C
-0.88 C
1925
12.1 C
+0.19 C
1926
11.3 C
-0.60 C
1929
12.5 C
+0.59 C
1930
13.2 C
+1.29 C
1931
13.9 C
+1.96 C
1932
13.3 C
+1.38 C
1933
13.1 C
+1.16 C
1934
12.4 C
+0.44 C
1935
12.1 C
+0.21 C
1936
12.3 C
+0.38 C
1937
12.4 C
+0.51 C
1938
13.1 C
+1.19 C
1939
13.0 C
+1.05 C
1940
11.2 C
-0.77 C
1941
12.9 C
+1.00 C
1942
12.2 C
+0.26 C
1943
11.9 C
-0.07 C
1944
12.1 C
+0.15 C
1945
12.2 C
+0.23 C
1946
12.8 C
+0.92 C
1947
12.0 C
+0.08 C
1948
11.8 C
-0.16 C
1949
12.8 C
+0.91 C
1950
11.2 C
-0.75 C
1951
11.4 C
-0.52 C
1952
11.7 C
-0.22 C
1953
12.4 C
+0.46 C
1954
11.4 C
-0.48 C
1955
11.4 C
-0.56 C
1956
11.0 C
-0.92 C
1957
11.9 C
-0.03 C
1958
10.7 C
-1.23 C
1959
12.4 C
+0.48 C
1960
11.3 C
-0.62 C
1961
11.6 C
-0.32 C
1962
11.1 C
-0.83 C
1963
11.0 C
-0.94 C
1964
11.8 C
-0.16 C
1966
11.5 C
-0.46 C
1967
11.1 C
-0.85 C
1968
11.6 C
-0.33 C
1969
11.5 C
-0.45 C
1970
11.8 C
-0.13 C
1971
11.8 C
-0.14 C
1972
11.2 C
-0.71 C
1973
12.7 C
+0.78 C
1974
12.2 C
+0.32 C
1975
12.4 C
+0.51 C
1976
10.5 C
-1.44 C
1977
11.5 C
-0.46 C
1978
10.7 C
-1.22 C
1979
10.8 C
-1.17 C
1980
10.5 C
-1.40 C
1981
10.6 C
-1.33 C
1982
11.4 C
-0.52 C
1983
12.3 C
+0.39 C
1984
12.3 C
+0.36 C
1986
11.9 C
-0.03 C
1988
11.1 C
-0.86 C
The annual mean temperature here has fallen by 0.1 C (0.1 to 0.2) per decade over 1905 to 1988. In Fahrenheit: 0.3 F (0.1 to 0.4) per decade. The slope is a straight line fitted to 76 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Hanover
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.1 C (-0.2 to -0.1) per decade
-0.3 F (-0.4 to -0.1) per decade
1905 to 1988
76
Fall
Mean daily maximum
-0.1 C (-0.2 to -0.1) per decade
-0.3 F (-0.4 to -0.1) per decade
1905 to 1988
76
Fall
Mean daily minimum
-0.1 C (-0.2 to -0.1) per decade
-0.3 F (-0.4 to -0.1) per decade
1905 to 1988
76
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
1904 to 1993
Yearly extremes at Hanover: 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)
1918
36.7 C (98.1 F)
90
Coldest night (TNn)
-26.7 C (-16.1 F)
1982
-16.7 C (1.9 F)
90
Wettest day (Rx1day)
154.9 mm (6.1 in)
1972
60.2 mm (2.4 in)
90
Wettest five days (Rx5day)
261.3 mm (10.3 in)
1975
86.4 mm (3.4 in)
90
Longest dry spell (CDD)
38 days
1966
18 days
90
Hottest day (TXx)
The hottest day of the year at Hanover, 1904 to 1993. The record is 40.6 C (105.1 F) in 1918, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Hanover by year
Year
Hottest day (TXx)
1904
35.6 C (96.1 F)
1905
37.2 C (99.0 F)
1906
36.1 C (97.0 F)
1907
35.6 C (96.1 F)
1908
38.9 C (102.0 F)
1909
37.8 C (100.0 F)
1910
36.7 C (98.1 F)
1911
38.9 C (102.0 F)
1912
34.4 C (93.9 F)
1913
38.3 C (100.9 F)
1914
36.1 C (97.0 F)
1915
34.4 C (93.9 F)
1916
37.2 C (99.0 F)
1917
37.8 C (100.0 F)
1918
40.6 C (105.1 F)
1919
37.8 C (100.0 F)
1920
35.6 C (96.1 F)
1921
36.1 C (97.0 F)
1922
35.0 C (95.0 F)
1923
36.7 C (98.1 F)
1924
36.7 C (98.1 F)
1925
37.8 C (100.0 F)
1926
38.9 C (102.0 F)
1927
33.9 C (93.0 F)
1928
35.0 C (95.0 F)
1929
36.1 C (97.0 F)
1930
38.9 C (102.0 F)
1931
37.8 C (100.0 F)
1932
36.7 C (98.1 F)
1933
36.7 C (98.1 F)
1934
38.9 C (102.0 F)
1935
36.1 C (97.0 F)
1936
40.6 C (105.1 F)
1937
36.7 C (98.1 F)
1938
35.6 C (96.1 F)
1939
36.1 C (97.0 F)
1940
36.7 C (98.1 F)
1941
35.6 C (96.1 F)
1942
34.4 C (93.9 F)
1943
35.6 C (96.1 F)
1944
37.8 C (100.0 F)
1945
37.2 C (99.0 F)
1946
34.4 C (93.9 F)
1947
35.0 C (95.0 F)
1948
37.2 C (99.0 F)
1949
37.8 C (100.0 F)
1950
34.4 C (93.9 F)
1951
34.4 C (93.9 F)
1952
36.7 C (98.1 F)
1953
38.9 C (102.0 F)
1954
38.9 C (102.0 F)
1955
38.3 C (100.9 F)
1956
36.1 C (97.0 F)
1957
37.2 C (99.0 F)
1958
33.3 C (91.9 F)
1959
36.7 C (98.1 F)
1960
34.4 C (93.9 F)
1961
33.9 C (93.0 F)
1962
36.7 C (98.1 F)
1963
36.7 C (98.1 F)
1964
37.2 C (99.0 F)
1965
35.6 C (96.1 F)
1966
40.6 C (105.1 F)
1967
34.4 C (93.9 F)
1968
36.1 C (97.0 F)
1969
36.1 C (97.0 F)
1970
35.0 C (95.0 F)
1971
35.6 C (96.1 F)
1972
35.6 C (96.1 F)
1973
37.2 C (99.0 F)
1974
35.6 C (96.1 F)
1975
36.7 C (98.1 F)
1976
34.4 C (93.9 F)
1977
35.6 C (96.1 F)
1978
36.1 C (97.0 F)
1979
34.4 C (93.9 F)
1980
38.3 C (100.9 F)
1981
36.1 C (97.0 F)
1982
35.6 C (96.1 F)
1983
39.4 C (102.9 F)
1984
40.6 C (105.1 F)
1985
36.1 C (97.0 F)
1986
37.2 C (99.0 F)
1987
38.9 C (102.0 F)
1988
40.6 C (105.1 F)
1989
35.0 C (95.0 F)
1990
36.1 C (97.0 F)
1991
38.3 C (100.9 F)
1992
33.3 C (91.9 F)
1993
37.2 C (99.0 F)
Coldest night (TNn)
The coldest night of the year at Hanover, 1904 to 1993. The record is -26.7 C (-16.1 F) in 1982, marked on the chart; the median year is -16.7 C (1.9 F).
Coldest night (TNn) at Hanover by year
Year
Coldest night (TNn)
1904
-16.7 C (1.9 F)
1905
-18.9 C (-2.0 F)
1906
-15.6 C (3.9 F)
1907
-17.8 C (0.0 F)
1908
-16.1 C (3.0 F)
1909
-14.4 C (6.1 F)
1910
-14.4 C (6.1 F)
1911
-11.7 C (10.9 F)
1912
-26.1 C (-15.0 F)
1913
-12.8 C (9.0 F)
1914
-20.0 C (-4.0 F)
1915
-11.1 C (12.0 F)
1916
-17.8 C (0.0 F)
1917
-22.2 C (-8.0 F)
1918
-21.7 C (-7.1 F)
1919
-18.3 C (-0.9 F)
1920
-16.1 C (3.0 F)
1921
-15.6 C (3.9 F)
1922
-18.3 C (-0.9 F)
1923
-14.4 C (6.1 F)
1924
-16.1 C (3.0 F)
1925
-20.6 C (-5.1 F)
1926
-16.7 C (1.9 F)
1927
-16.1 C (3.0 F)
1928
-10.6 C (12.9 F)
1929
-15.6 C (3.9 F)
1930
-17.8 C (0.0 F)
1931
-11.1 C (12.0 F)
1932
-13.3 C (8.1 F)
1933
-15.6 C (3.9 F)
1934
-23.3 C (-9.9 F)
1935
-21.1 C (-6.0 F)
1936
-21.1 C (-6.0 F)
1937
-11.7 C (10.9 F)
1938
-13.3 C (8.1 F)
1939
-13.3 C (8.1 F)
1940
-17.8 C (0.0 F)
1941
-11.7 C (10.9 F)
1942
-20.6 C (-5.1 F)
1943
-16.7 C (1.9 F)
1944
-12.2 C (10.0 F)
1945
-16.1 C (3.0 F)
1946
-13.3 C (8.1 F)
1947
-16.1 C (3.0 F)
1948
-17.8 C (0.0 F)
1949
-14.4 C (6.1 F)
1950
-15.0 C (5.0 F)
1951
-17.2 C (1.0 F)
1952
-13.3 C (8.1 F)
1953
-10.6 C (12.9 F)
1954
-15.6 C (3.9 F)
1955
-18.3 C (-0.9 F)
1956
-11.7 C (10.9 F)
1957
-18.3 C (-0.9 F)
1958
-16.7 C (1.9 F)
1959
-15.6 C (3.9 F)
1960
-17.8 C (0.0 F)
1961
-20.0 C (-4.0 F)
1962
-16.1 C (3.0 F)
1963
-20.6 C (-5.1 F)
1964
-16.7 C (1.9 F)
1965
-16.7 C (1.9 F)
1966
-17.2 C (1.0 F)
1967
-17.2 C (1.0 F)
1968
-18.9 C (-2.0 F)
1969
-13.3 C (8.1 F)
1970
-18.9 C (-2.0 F)
1971
-15.6 C (3.9 F)
1972
-17.8 C (0.0 F)
1973
-15.0 C (5.0 F)
1974
-12.2 C (10.0 F)
1975
-13.3 C (8.1 F)
1976
-15.0 C (5.0 F)
1977
-21.7 C (-7.1 F)
1978
-15.0 C (5.0 F)
1979
-20.0 C (-4.0 F)
1980
-17.8 C (0.0 F)
1981
-16.7 C (1.9 F)
1982
-26.7 C (-16.1 F)
1983
-19.4 C (-2.9 F)
1984
-18.9 C (-2.0 F)
1985
-23.3 C (-9.9 F)
1986
-14.4 C (6.1 F)
1987
-18.9 C (-2.0 F)
1988
-18.3 C (-0.9 F)
1989
-20.0 C (-4.0 F)
1990
-15.0 C (5.0 F)
1991
-14.4 C (6.1 F)
1992
-3.9 C (25.0 F)
1993
-18.3 C (-0.9 F)
Wettest day (Rx1day)
The wettest day of the year at Hanover, 1904 to 1993. The record is 154.9 mm (6.1 in) in 1972, marked on the chart; the median year is 60.2 mm (2.4 in).
Wettest day (Rx1day) at Hanover by year
Year
Wettest day (Rx1day)
1904
33.5 mm (1.3 in)
1905
108.7 mm (4.3 in)
1906
65.0 mm (2.6 in)
1907
62.0 mm (2.4 in)
1908
61.0 mm (2.4 in)
1909
46.0 mm (1.8 in)
1910
38.1 mm (1.5 in)
1911
66.5 mm (2.6 in)
1912
48.8 mm (1.9 in)
1913
42.4 mm (1.7 in)
1914
38.1 mm (1.5 in)
1915
73.4 mm (2.9 in)
1916
88.9 mm (3.5 in)
1917
64.0 mm (2.5 in)
1918
55.9 mm (2.2 in)
1919
60.5 mm (2.4 in)
1920
44.7 mm (1.8 in)
1921
55.4 mm (2.2 in)
1922
40.4 mm (1.6 in)
1923
67.8 mm (2.7 in)
1924
85.3 mm (3.4 in)
1925
31.8 mm (1.3 in)
1926
55.4 mm (2.2 in)
1927
56.4 mm (2.2 in)
1928
63.5 mm (2.5 in)
1929
90.7 mm (3.6 in)
1930
53.6 mm (2.1 in)
1931
31.8 mm (1.3 in)
1932
63.2 mm (2.5 in)
1933
76.7 mm (3.0 in)
1934
61.2 mm (2.4 in)
1935
48.3 mm (1.9 in)
1936
49.5 mm (1.9 in)
1937
70.9 mm (2.8 in)
1938
59.9 mm (2.4 in)
1939
52.6 mm (2.1 in)
1940
108.5 mm (4.3 in)
1941
42.4 mm (1.7 in)
1942
63.0 mm (2.5 in)
1943
62.2 mm (2.4 in)
1944
62.2 mm (2.4 in)
1945
98.6 mm (3.9 in)
1946
42.4 mm (1.7 in)
1947
59.9 mm (2.4 in)
1948
62.2 mm (2.4 in)
1949
68.6 mm (2.7 in)
1950
58.9 mm (2.3 in)
1951
42.9 mm (1.7 in)
1952
63.8 mm (2.5 in)
1953
71.4 mm (2.8 in)
1954
40.9 mm (1.6 in)
1955
106.2 mm (4.2 in)
1956
56.9 mm (2.2 in)
1957
56.4 mm (2.2 in)
1958
41.7 mm (1.6 in)
1959
49.5 mm (1.9 in)
1960
63.8 mm (2.5 in)
1961
77.2 mm (3.0 in)
1962
87.9 mm (3.5 in)
1963
48.8 mm (1.9 in)
1964
37.1 mm (1.5 in)
1965
43.7 mm (1.7 in)
1966
82.6 mm (3.3 in)
1967
52.3 mm (2.1 in)
1968
104.4 mm (4.1 in)
1969
60.5 mm (2.4 in)
1970
59.4 mm (2.3 in)
1971
72.4 mm (2.9 in)
1972
154.9 mm (6.1 in)
1973
71.9 mm (2.8 in)
1974
43.9 mm (1.7 in)
1975
140.2 mm (5.5 in)
1976
55.9 mm (2.2 in)
1977
46.7 mm (1.8 in)
1978
58.7 mm (2.3 in)
1979
80.5 mm (3.2 in)
1980
59.9 mm (2.4 in)
1981
49.8 mm (2.0 in)
1982
34.3 mm (1.4 in)
1983
70.1 mm (2.8 in)
1984
81.0 mm (3.2 in)
1985
78.7 mm (3.1 in)
1986
56.6 mm (2.2 in)
1987
81.5 mm (3.2 in)
1988
100.3 mm (3.9 in)
1989
72.4 mm (2.9 in)
1990
42.7 mm (1.7 in)
1991
42.2 mm (1.7 in)
1992
16.3 mm (0.6 in)
1993
72.4 mm (2.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Hanover, 1904 to 1993. The record is 261.3 mm (10.3 in) in 1975, marked on the chart; the median year is 86.4 mm (3.4 in).
Wettest five days (Rx5day) at Hanover by year
Year
Wettest five days (Rx5day)
1904
59.4 mm (2.3 in)
1905
159.5 mm (6.3 in)
1906
81.1 mm (3.2 in)
1907
69.4 mm (2.7 in)
1908
94.2 mm (3.7 in)
1909
54.3 mm (2.1 in)
1910
79.5 mm (3.1 in)
1911
194.2 mm (7.6 in)
1912
84.7 mm (3.3 in)
1913
89.7 mm (3.5 in)
1914
72.4 mm (2.9 in)
1915
101.9 mm (4.0 in)
1916
111.8 mm (4.4 in)
1917
97.8 mm (3.9 in)
1918
109.8 mm (4.3 in)
1919
93.2 mm (3.7 in)
1920
77.7 mm (3.1 in)
1921
71.2 mm (2.8 in)
1922
68.3 mm (2.7 in)
1923
103.4 mm (4.1 in)
1924
125.2 mm (4.9 in)
1925
46.2 mm (1.8 in)
1926
79.1 mm (3.1 in)
1927
82.2 mm (3.2 in)
1928
101.0 mm (4.0 in)
1929
146.2 mm (5.8 in)
1930
68.8 mm (2.7 in)
1931
58.9 mm (2.3 in)
1932
97.9 mm (3.9 in)
1933
176.8 mm (7.0 in)
1934
114.2 mm (4.5 in)
1935
86.1 mm (3.4 in)
1936
64.7 mm (2.5 in)
1937
145.6 mm (5.7 in)
1938
73.9 mm (2.9 in)
1939
120.7 mm (4.8 in)
1940
118.4 mm (4.7 in)
1941
63.5 mm (2.5 in)
1942
99.6 mm (3.9 in)
1943
119.4 mm (4.7 in)
1944
79.3 mm (3.1 in)
1945
166.6 mm (6.6 in)
1946
85.3 mm (3.4 in)
1947
126.5 mm (5.0 in)
1948
72.4 mm (2.9 in)
1949
78.0 mm (3.1 in)
1950
84.8 mm (3.3 in)
1951
97.1 mm (3.8 in)
1952
124.3 mm (4.9 in)
1953
86.6 mm (3.4 in)
1954
60.2 mm (2.4 in)
1955
141.2 mm (5.6 in)
1956
75.4 mm (3.0 in)
1957
69.1 mm (2.7 in)
1958
83.3 mm (3.3 in)
1959
67.4 mm (2.7 in)
1960
119.9 mm (4.7 in)
1961
89.1 mm (3.5 in)
1962
105.2 mm (4.1 in)
1963
63.8 mm (2.5 in)
1964
67.2 mm (2.6 in)
1965
64.3 mm (2.5 in)
1966
125.0 mm (4.9 in)
1967
85.4 mm (3.4 in)
1968
110.2 mm (4.3 in)
1969
146.6 mm (5.8 in)
1970
102.1 mm (4.0 in)
1971
98.1 mm (3.9 in)
1972
254.0 mm (10.0 in)
1973
84.9 mm (3.3 in)
1974
70.9 mm (2.8 in)
1975
261.3 mm (10.3 in)
1976
72.9 mm (2.9 in)
1977
92.1 mm (3.6 in)
1978
84.3 mm (3.3 in)
1979
104.2 mm (4.1 in)
1980
72.1 mm (2.8 in)
1981
68.6 mm (2.7 in)
1982
82.0 mm (3.2 in)
1983
72.6 mm (2.9 in)
1984
96.2 mm (3.8 in)
1985
122.1 mm (4.8 in)
1986
73.3 mm (2.9 in)
1987
105.9 mm (4.2 in)
1988
120.5 mm (4.7 in)
1989
113.0 mm (4.4 in)
1990
81.3 mm (3.2 in)
1991
61.3 mm (2.4 in)
1992
36.6 mm (1.4 in)
1993
118.6 mm (4.7 in)
Longest dry spell (CDD)
The longest dry spell of the year at Hanover, 1904 to 1993. The record is 38 days in 1966, marked on the chart; the median year is 18 days.
Longest dry spell (CDD) at Hanover by year
Year
Longest dry spell (CDD)
1904
19 days
1905
21 days
1906
13 days
1907
18 days
1908
19 days
1909
25 days
1910
23 days
1911
17 days
1912
16 days
1913
20 days
1914
20 days
1915
21 days
1916
13 days
1917
21 days
1918
18 days
1919
14 days
1920
26 days
1921
15 days
1922
24 days
1923
24 days
1924
27 days
1925
16 days
1926
17 days
1927
13 days
1928
13 days
1929
17 days
1930
37 days
1931
28 days
1932
27 days
1933
11 days
1934
19 days
1935
17 days
1936
15 days
1937
16 days
1938
13 days
1939
17 days
1940
10 days
1941
28 days
1942
17 days
1943
19 days
1944
18 days
1945
15 days
1946
21 days
1947
35 days
1948
14 days
1949
15 days
1950
15 days
1951
12 days
1952
16 days
1953
26 days
1954
16 days
1955
21 days
1956
15 days
1957
14 days
1958
25 days
1959
26 days
1960
16 days
1961
15 days
1962
20 days
1963
32 days
1964
27 days
1965
15 days
1966
38 days
1967
16 days
1968
26 days
1969
17 days
1970
16 days
1971
22 days
1972
16 days
1973
24 days
1974
18 days
1975
14 days
1976
24 days
1977
26 days
1978
19 days
1979
15 days
1980
12 days
1981
15 days
1982
23 days
1983
24 days
1984
14 days
1985
16 days
1986
20 days
1987
15 days
1988
29 days
1989
12 days
1990
16 days
1991
22 days
1992
21 days
1993
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
76 years with a frost
Across 76 years with a frost, the median last spring frost at Hanover falls on 18 April and the median first autumn frost on 20 October, which leaves a median of 187 days between them.
In 1956 to 1988 the median growing season was 189 days. That is 6 days more than in 1905 to 1939.
Fitted over all years, the growing season changes by +0.1 days per decade at this station.
Frost dates and growing season at Hanover
Measure
Median, all years
Earliest period (1905 to 1939)
Recent period (1956 to 1988)
Recent against earliest
Fitted trend
Last spring frost
18 April
19 April
15 April
4 days earlier
-0.2 days per decade
First autumn frost
20 October
20 October
20 October
no change
-0.1 days per decade
Growing days
187 days
183 days
189 days
6 days more
+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
82 years, 1905 to 1990
A day with at least 59.7 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 142.7 mm (5.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Hanover: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
59.7 mm (2.4 in)
5 years
78.9 mm (3.1 in)
10 years
92.8 mm (3.7 in)
25 years
111.7 mm (4.4 in)
50 years
126.8 mm (5.0 in)
100 years
142.7 mm (5.6 in)
Longer than the 82 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, 82 years of values from 1905 to 1990.
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: 154.9 mm (6.1 in) in 1972; 140.2 mm (5.5 in) in 1975; 108.7 mm (4.3 in) in 1905.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Hanover, at 1951. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1951 ran 0.6 C (1.1 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Hanover, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1951
-0.6
-1.1
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 Hanover standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Hanover 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.