Record envelope, standing records and threshold days for Hannah 2 N (USC00323936), North Dakota, United States, with 81 years of record.
Key Facts for Hannah 2 N
Hannah 2 N (USC00323936) is a weather station in North Dakota, United States at 49.00 latitude and -98.68 longitude, 480 m (1,575 ft) above sea level.
The station reports from 1905 to 1985, 81 years of record.
1,464 records set at Hannah 2 N still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Hannah 2 N set a daily record precipitation of 29.7 mm (1.2 in) on 23 October 1985.
About the Station
Location: North Dakota, United States, 49.00 latitude, -98.68 longitude.
Elevation: 480 m (1,575 ft).
Period of record: 1905 to 1985, 81 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 Hannah 2 N. 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 Hannah 2 N, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
9.4 C (48.9 F)
-47.8 C (-54.0 F)
n/a
n/a
Feb
12.8 C (55.0 F)
-43.9 C (-47.0 F)
n/a
n/a
Mar
27.8 C (82.0 F)
-38.9 C (-38.0 F)
n/a
n/a
Apr
35.6 C (96.1 F)
-28.3 C (-18.9 F)
n/a
n/a
May
41.1 C (106.0 F)
-13.3 C (8.1 F)
n/a
n/a
Jun
37.8 C (100.0 F)
-6.1 C (21.0 F)
n/a
n/a
Jul
42.2 C (108.0 F)
0.0 C (32.0 F)
n/a
n/a
Aug
39.4 C (102.9 F)
-5.0 C (23.0 F)
n/a
n/a
Sep
38.9 C (102.0 F)
-9.4 C (15.1 F)
n/a
n/a
Oct
32.2 C (90.0 F)
-21.7 C (-7.1 F)
n/a
n/a
Nov
23.9 C (75.0 F)
-36.1 C (-33.0 F)
n/a
n/a
Dec
17.8 C (64.0 F)
-43.3 C (-45.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Hannah 2 N still stand. 1936 holds the most, with 75.
Standing records at Hannah 2 N by the year they were set
Year set
Standing records
1905
9
1906
22
1907
15
1908
13
1909
10
1910
57
1911
25
1912
19
1913
30
1914
47
1915
33
1916
27
1917
25
1918
28
1919
38
1920
15
1921
7
1929
1
1932
12
1933
20
1934
34
1935
21
1936
75
1937
17
1938
21
1939
37
1940
19
1941
14
1942
26
1943
13
1944
17
1945
16
1946
14
1947
18
1948
14
1949
18
1950
23
1951
20
1952
21
1953
23
1954
20
1955
14
1956
16
1957
6
1958
23
1959
19
1960
5
1961
8
1962
25
1963
21
1964
32
1965
13
1966
28
1967
15
1968
23
1969
19
1970
15
1971
11
1972
22
1973
13
1974
15
1975
18
1976
10
1977
29
1978
11
1979
16
1980
17
1981
17
1982
12
1983
25
1984
24
1985
8
Wettest Day of Each Month
Jul: 90.2 mm (3.6 in)
The wettest day on record for each calendar month at Hannah 2 N. The most was 90.2 mm (3.6 in) on 11 July 1943.
Record daily precipitation for each month at Hannah 2 N
Month
Record daily precipitation (mm)
Date
Jan
27.9 mm (1.1 in)
4 January 1910
Feb
19.8 mm (0.8 in)
26 February 1970
Mar
25.4 mm (1.0 in)
4 March 1966
Apr
69.6 mm (2.7 in)
27 April 1924
May
66.0 mm (2.6 in)
23 May 1933
Jun
87.4 mm (3.4 in)
20 June 1979
Jul
90.2 mm (3.6 in)
11 July 1943
Aug
85.9 mm (3.4 in)
5 August 1951
Sep
62.0 mm (2.4 in)
5 September 1910
Oct
54.6 mm (2.1 in)
5 October 1924
Nov
61.0 mm (2.4 in)
6 November 1922
Dec
76.2 mm (3.0 in)
16 December 1946
Period of Record Coverage
1905 to 1985
Complete yearUnder 90 percent of days
72 years of record at Hannah 2 N, 1905 to 1985. 21 years have data for under 90 percent of days and are left out of rankings: 1905, 1906, 1907, 1908, 1909, 1910, 1912, 1913 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 39 complete years at Hannah 2 N, 1911 to 1984. Blue stripes are years cooler than the station's own mean of 2.3 C (36.1 F); red stripes are warmer. The coolest year was 1950, at 0.0 C (31.9 F), and the warmest was 1934, at 4.1 C (39.4 F). The strongest colour marks a difference of 2.4 C (4.3 F).
Annual mean temperature at Hannah 2 N as warming stripes, 1911 to 1984
Year
Annual mean temperature
Difference from the station mean
1911
0.7 C
-1.63 C
1914
1.5 C
-0.76 C
1933
3.1 C
+0.85 C
1934
4.1 C
+1.83 C
1935
2.2 C
-0.08 C
1936
2.1 C
-0.22 C
1937
1.5 C
-0.78 C
1938
3.1 C
+0.85 C
1941
3.0 C
+0.66 C
1942
2.4 C
+0.08 C
1943
2.1 C
-0.17 C
1944
3.5 C
+1.20 C
1945
1.9 C
-0.42 C
1947
2.3 C
-0.02 C
1950
0.0 C
-2.33 C
1951
0.6 C
-1.65 C
1952
3.7 C
+1.38 C
1953
3.8 C
+1.54 C
1954
3.0 C
+0.75 C
1957
2.8 C
+0.55 C
1958
2.8 C
+0.55 C
1959
2.1 C
-0.19 C
1960
2.3 C
+0.00 C
1961
3.0 C
+0.66 C
1964
2.2 C
-0.13 C
1965
1.3 C
-0.97 C
1967
2.0 C
-0.27 C
1968
2.7 C
+0.43 C
1969
1.9 C
-0.40 C
1970
1.4 C
-0.87 C
1971
2.0 C
-0.30 C
1972
1.0 C
-1.25 C
1974
1.0 C
-1.29 C
1976
2.5 C
+0.21 C
1977
3.5 C
+1.16 C
1979
0.6 C
-1.69 C
1980
2.8 C
+0.49 C
1983
3.3 C
+0.99 C
1984
3.5 C
+1.19 C
The fitted trend in annual mean temperature here over 1911 to 1984 is 0.03 C (-0.15 to 0.21) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.3 to 0.4) per decade. The slope is a straight line fitted to 39 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Hannah 2 N
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.03 C (-0.15 to 0.21) per decade
0.1 F (-0.3 to 0.4) per decade
1911 to 1984
39
Not clearly different from zero
Mean daily maximum
-0.04 C (-0.25 to 0.18) per decade
-0.1 F (-0.4 to 0.3) per decade
1911 to 1984
39
Not clearly different from zero
Mean daily minimum
0.1 C (-0.1 to 0.3) per decade
0.2 F (-0.2 to 0.5) per decade
1911 to 1984
39
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
1905 to 1985
Yearly extremes at Hannah 2 N: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
42.2 C (108.0 F)
1936
35.6 C (96.1 F)
72
Coldest night (TNn)
-47.8 C (-54.0 F)
1916
-37.8 C (-36.0 F)
72
Wettest day (Rx1day)
90.2 mm (3.6 in)
1943
45.2 mm (1.8 in)
81
Wettest five days (Rx5day)
133.4 mm (5.3 in)
1944
61.1 mm (2.4 in)
81
Longest dry spell (CDD)
106 days
1980
31 days
81
Hottest day (TXx)
The hottest day of the year at Hannah 2 N, 1905 to 1985. The record is 42.2 C (108.0 F) in 1936, marked on the chart; the median year is 35.6 C (96.1 F).
Hottest day (TXx) at Hannah 2 N by year
Year
Hottest day (TXx)
1905
32.2 C (90.0 F)
1906
38.9 C (102.0 F)
1907
33.9 C (93.0 F)
1908
33.3 C (91.9 F)
1909
31.1 C (88.0 F)
1910
37.2 C (99.0 F)
1911
31.7 C (89.1 F)
1912
36.7 C (98.1 F)
1913
35.0 C (95.0 F)
1914
38.3 C (100.9 F)
1915
35.6 C (96.1 F)
1916
36.1 C (97.0 F)
1917
37.8 C (100.0 F)
1918
34.4 C (93.9 F)
1919
36.7 C (98.1 F)
1920
36.1 C (97.0 F)
1921
9.4 C (48.9 F)
1922
n/a
1923
n/a
1924
n/a
1925
n/a
1926
n/a
1927
n/a
1928
n/a
1929
0.0 C (32.0 F)
1930
n/a
1931
n/a
1932
36.1 C (97.0 F)
1933
37.8 C (100.0 F)
1934
41.1 C (106.0 F)
1935
37.2 C (99.0 F)
1936
42.2 C (108.0 F)
1937
35.0 C (95.0 F)
1938
36.7 C (98.1 F)
1939
35.6 C (96.1 F)
1940
35.6 C (96.1 F)
1941
35.0 C (95.0 F)
1942
32.2 C (90.0 F)
1943
30.6 C (87.1 F)
1944
33.3 C (91.9 F)
1945
35.0 C (95.0 F)
1946
35.6 C (96.1 F)
1947
35.0 C (95.0 F)
1948
33.3 C (91.9 F)
1949
37.8 C (100.0 F)
1950
33.9 C (93.0 F)
1951
34.4 C (93.9 F)
1952
35.6 C (96.1 F)
1953
34.4 C (93.9 F)
1954
31.1 C (88.0 F)
1955
35.6 C (96.1 F)
1956
33.3 C (91.9 F)
1957
35.0 C (95.0 F)
1958
35.6 C (96.1 F)
1959
36.1 C (97.0 F)
1960
38.3 C (100.9 F)
1961
36.7 C (98.1 F)
1962
32.2 C (90.0 F)
1963
32.8 C (91.0 F)
1964
39.4 C (102.9 F)
1965
35.0 C (95.0 F)
1966
33.3 C (91.9 F)
1967
35.6 C (96.1 F)
1968
36.1 C (97.0 F)
1969
35.0 C (95.0 F)
1970
35.0 C (95.0 F)
1971
34.4 C (93.9 F)
1972
36.1 C (97.0 F)
1973
35.6 C (96.1 F)
1974
35.0 C (95.0 F)
1975
37.2 C (99.0 F)
1976
35.6 C (96.1 F)
1977
34.4 C (93.9 F)
1978
37.2 C (99.0 F)
1979
35.6 C (96.1 F)
1980
36.7 C (98.1 F)
1981
35.0 C (95.0 F)
1982
32.8 C (91.0 F)
1983
38.3 C (100.9 F)
1984
36.7 C (98.1 F)
1985
35.6 C (96.1 F)
Coldest night (TNn)
The coldest night of the year at Hannah 2 N, 1905 to 1985. The record is -47.8 C (-54.0 F) in 1916, marked on the chart; the median year is -37.8 C (-36.0 F).
Coldest night (TNn) at Hannah 2 N by year
Year
Coldest night (TNn)
1905
-34.4 C (-29.9 F)
1906
-35.6 C (-32.1 F)
1907
-30.6 C (-23.1 F)
1908
-37.2 C (-35.0 F)
1909
-40.6 C (-41.1 F)
1910
-36.7 C (-34.1 F)
1911
-40.6 C (-41.1 F)
1912
-45.6 C (-50.1 F)
1913
-36.1 C (-33.0 F)
1914
-43.9 C (-47.0 F)
1915
-43.3 C (-45.9 F)
1916
-47.8 C (-54.0 F)
1917
-43.3 C (-45.9 F)
1918
-41.7 C (-43.1 F)
1919
-40.0 C (-40.0 F)
1920
-40.6 C (-41.1 F)
1921
-35.0 C (-31.0 F)
1922
n/a
1923
n/a
1924
n/a
1925
n/a
1926
n/a
1927
n/a
1928
n/a
1929
-38.3 C (-36.9 F)
1930
n/a
1931
n/a
1932
-31.7 C (-25.1 F)
1933
-38.9 C (-38.0 F)
1934
-37.8 C (-36.0 F)
1935
-37.8 C (-36.0 F)
1936
-42.8 C (-45.0 F)
1937
-38.3 C (-36.9 F)
1938
-40.0 C (-40.0 F)
1939
-40.6 C (-41.1 F)
1940
-35.6 C (-32.1 F)
1941
-38.9 C (-38.0 F)
1942
-35.0 C (-31.0 F)
1943
-42.2 C (-44.0 F)
1944
-35.0 C (-31.0 F)
1945
-35.0 C (-31.0 F)
1946
-36.1 C (-33.0 F)
1947
-34.4 C (-29.9 F)
1948
-38.3 C (-36.9 F)
1949
-40.6 C (-41.1 F)
1950
-40.0 C (-40.0 F)
1951
-38.9 C (-38.0 F)
1952
-37.2 C (-35.0 F)
1953
-33.9 C (-29.0 F)
1954
-38.3 C (-36.9 F)
1955
-36.7 C (-34.1 F)
1956
-36.1 C (-33.0 F)
1957
-35.6 C (-32.1 F)
1958
-35.0 C (-31.0 F)
1959
-35.0 C (-31.0 F)
1960
-36.1 C (-33.0 F)
1961
-38.9 C (-38.0 F)
1962
-38.9 C (-38.0 F)
1963
-37.8 C (-36.0 F)
1964
-35.0 C (-31.0 F)
1965
-36.1 C (-33.0 F)
1966
-42.8 C (-45.0 F)
1967
-38.3 C (-36.9 F)
1968
-40.0 C (-40.0 F)
1969
-35.6 C (-32.1 F)
1970
-38.9 C (-38.0 F)
1971
-37.2 C (-35.0 F)
1972
-38.3 C (-36.9 F)
1973
-36.7 C (-34.1 F)
1974
-37.8 C (-36.0 F)
1975
-34.4 C (-29.9 F)
1976
-36.1 C (-33.0 F)
1977
-36.7 C (-34.1 F)
1978
-36.7 C (-34.1 F)
1979
-37.8 C (-36.0 F)
1980
-36.7 C (-34.1 F)
1981
-35.6 C (-32.1 F)
1982
-38.3 C (-36.9 F)
1983
-43.3 C (-45.9 F)
1984
-35.6 C (-32.1 F)
1985
-38.3 C (-36.9 F)
Wettest day (Rx1day)
The wettest day of the year at Hannah 2 N, 1905 to 1985. The record is 90.2 mm (3.6 in) in 1943, marked on the chart; the median year is 45.2 mm (1.8 in).
Wettest day (Rx1day) at Hannah 2 N by year
Year
Wettest day (Rx1day)
1905
41.9 mm (1.6 in)
1906
38.1 mm (1.5 in)
1907
27.9 mm (1.1 in)
1908
38.1 mm (1.5 in)
1909
35.1 mm (1.4 in)
1910
62.0 mm (2.4 in)
1911
45.5 mm (1.8 in)
1912
64.0 mm (2.5 in)
1913
41.1 mm (1.6 in)
1914
38.4 mm (1.5 in)
1915
44.2 mm (1.7 in)
1916
28.7 mm (1.1 in)
1917
41.7 mm (1.6 in)
1918
46.2 mm (1.8 in)
1919
46.7 mm (1.8 in)
1920
30.7 mm (1.2 in)
1921
45.2 mm (1.8 in)
1922
61.0 mm (2.4 in)
1923
50.3 mm (2.0 in)
1924
69.6 mm (2.7 in)
1925
42.4 mm (1.7 in)
1926
46.2 mm (1.8 in)
1927
52.1 mm (2.1 in)
1928
44.5 mm (1.8 in)
1929
41.9 mm (1.6 in)
1930
55.4 mm (2.2 in)
1931
32.5 mm (1.3 in)
1932
59.2 mm (2.3 in)
1933
66.0 mm (2.6 in)
1934
25.4 mm (1.0 in)
1935
45.2 mm (1.8 in)
1936
36.8 mm (1.4 in)
1937
85.1 mm (3.4 in)
1938
13.5 mm (0.5 in)
1939
41.7 mm (1.6 in)
1940
49.5 mm (1.9 in)
1941
45.7 mm (1.8 in)
1942
45.7 mm (1.8 in)
1943
90.2 mm (3.6 in)
1944
71.1 mm (2.8 in)
1945
55.9 mm (2.2 in)
1946
76.2 mm (3.0 in)
1947
73.7 mm (2.9 in)
1948
53.3 mm (2.1 in)
1949
41.4 mm (1.6 in)
1950
53.3 mm (2.1 in)
1951
85.9 mm (3.4 in)
1952
37.1 mm (1.5 in)
1953
31.2 mm (1.2 in)
1954
59.7 mm (2.4 in)
1955
53.6 mm (2.1 in)
1956
50.3 mm (2.0 in)
1957
53.8 mm (2.1 in)
1958
32.5 mm (1.3 in)
1959
54.9 mm (2.2 in)
1960
19.6 mm (0.8 in)
1961
40.9 mm (1.6 in)
1962
30.5 mm (1.2 in)
1963
63.0 mm (2.5 in)
1964
35.6 mm (1.4 in)
1965
53.3 mm (2.1 in)
1966
50.8 mm (2.0 in)
1967
44.5 mm (1.8 in)
1968
71.9 mm (2.8 in)
1969
38.1 mm (1.5 in)
1970
40.6 mm (1.6 in)
1971
49.5 mm (1.9 in)
1972
28.7 mm (1.1 in)
1973
43.9 mm (1.7 in)
1974
39.4 mm (1.6 in)
1975
41.4 mm (1.6 in)
1976
51.6 mm (2.0 in)
1977
37.6 mm (1.5 in)
1978
53.3 mm (2.1 in)
1979
87.4 mm (3.4 in)
1980
38.6 mm (1.5 in)
1981
63.0 mm (2.5 in)
1982
36.3 mm (1.4 in)
1983
46.0 mm (1.8 in)
1984
33.0 mm (1.3 in)
1985
29.7 mm (1.2 in)
Wettest five days (Rx5day)
The wettest five days of the year at Hannah 2 N, 1905 to 1985. The record is 133.4 mm (5.3 in) in 1944, marked on the chart; the median year is 61.1 mm (2.4 in).
Wettest five days (Rx5day) at Hannah 2 N by year
Year
Wettest five days (Rx5day)
1905
41.9 mm (1.6 in)
1906
58.4 mm (2.3 in)
1907
39.3 mm (1.5 in)
1908
46.5 mm (1.8 in)
1909
42.2 mm (1.7 in)
1910
76.2 mm (3.0 in)
1911
59.5 mm (2.3 in)
1912
122.1 mm (4.8 in)
1913
54.1 mm (2.1 in)
1914
36.9 mm (1.5 in)
1915
67.5 mm (2.7 in)
1916
36.8 mm (1.4 in)
1917
43.2 mm (1.7 in)
1918
64.2 mm (2.5 in)
1919
61.2 mm (2.4 in)
1920
38.1 mm (1.5 in)
1921
102.9 mm (4.1 in)
1922
61.0 mm (2.4 in)
1923
23.9 mm (0.9 in)
1924
0.0 mm (0.00 in)
1925
27.7 mm (1.1 in)
1926
46.0 mm (1.8 in)
1927
80.0 mm (3.1 in)
1928
47.5 mm (1.9 in)
1929
24.7 mm (1.0 in)
1930
80.8 mm (3.2 in)
1931
9.2 mm (0.36 in)
1932
70.2 mm (2.8 in)
1933
98.6 mm (3.9 in)
1934
35.8 mm (1.4 in)
1935
70.6 mm (2.8 in)
1936
54.1 mm (2.1 in)
1937
95.8 mm (3.8 in)
1938
25.3 mm (1.0 in)
1939
35.3 mm (1.4 in)
1940
66.8 mm (2.6 in)
1941
92.7 mm (3.6 in)
1942
73.6 mm (2.9 in)
1943
106.8 mm (4.2 in)
1944
133.4 mm (5.3 in)
1945
63.5 mm (2.5 in)
1946
49.6 mm (2.0 in)
1947
91.2 mm (3.6 in)
1948
87.6 mm (3.4 in)
1949
50.0 mm (2.0 in)
1950
85.6 mm (3.4 in)
1951
98.4 mm (3.9 in)
1952
47.6 mm (1.9 in)
1953
55.8 mm (2.2 in)
1954
92.1 mm (3.6 in)
1955
79.5 mm (3.1 in)
1956
55.2 mm (2.2 in)
1957
67.6 mm (2.7 in)
1958
61.1 mm (2.4 in)
1959
61.3 mm (2.4 in)
1960
32.1 mm (1.3 in)
1961
56.9 mm (2.2 in)
1962
65.1 mm (2.6 in)
1963
84.3 mm (3.3 in)
1964
59.5 mm (2.3 in)
1965
66.0 mm (2.6 in)
1966
53.5 mm (2.1 in)
1967
57.4 mm (2.3 in)
1968
100.1 mm (3.9 in)
1969
83.5 mm (3.3 in)
1970
57.1 mm (2.2 in)
1971
55.6 mm (2.2 in)
1972
40.2 mm (1.6 in)
1973
76.4 mm (3.0 in)
1974
85.0 mm (3.3 in)
1975
45.4 mm (1.8 in)
1976
73.2 mm (2.9 in)
1977
46.2 mm (1.8 in)
1978
65.5 mm (2.6 in)
1979
87.4 mm (3.4 in)
1980
41.2 mm (1.6 in)
1981
73.2 mm (2.9 in)
1982
61.7 mm (2.4 in)
1983
68.1 mm (2.7 in)
1984
54.8 mm (2.2 in)
1985
76.2 mm (3.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Hannah 2 N, 1905 to 1985. The record is 106 days in 1980, marked on the chart; the median year is 31 days.
Longest dry spell (CDD) at Hannah 2 N by year
Year
Longest dry spell (CDD)
1905
28 days
1906
67 days
1907
33 days
1908
25 days
1909
37 days
1910
29 days
1911
28 days
1912
27 days
1913
67 days
1914
45 days
1915
37 days
1916
31 days
1917
30 days
1918
31 days
1919
39 days
1920
32 days
1921
21 days
1922
17 days
1923
16 days
1924
29 days
1925
28 days
1926
21 days
1927
24 days
1928
15 days
1929
20 days
1930
4 days
1931
23 days
1932
22 days
1933
37 days
1934
47 days
1935
30 days
1936
39 days
1937
41 days
1938
46 days
1939
20 days
1940
24 days
1941
26 days
1942
35 days
1943
36 days
1944
35 days
1945
25 days
1946
19 days
1947
17 days
1948
31 days
1949
17 days
1950
26 days
1951
23 days
1952
45 days
1953
26 days
1954
32 days
1955
20 days
1956
34 days
1957
22 days
1958
25 days
1959
28 days
1960
39 days
1961
38 days
1962
29 days
1963
34 days
1964
39 days
1965
54 days
1966
20 days
1967
38 days
1968
35 days
1969
52 days
1970
22 days
1971
54 days
1972
28 days
1973
43 days
1974
30 days
1975
43 days
1976
53 days
1977
37 days
1978
31 days
1979
30 days
1980
106 days
1981
48 days
1982
35 days
1983
63 days
1984
62 days
1985
27 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
39 years with a frost
Across 39 years with a frost, the median last spring frost at Hannah 2 N falls on 31 May and the median first autumn frost on 11 September, which leaves a median of 107 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 Hannah 2 N
Measure
Median, all years
Earliest period
Recent period (1942 to 1984)
Recent against earliest
Fitted trend
Last spring frost
31 May
n/a
30 May
n/a
-1.3 days per decade
First autumn frost
11 September
n/a
13 September
n/a
+0.5 days per decade
Growing days
107 days
n/a
108 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
52 years, 1910 to 1984
A day with at least 45.8 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 98.4 mm (3.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Hannah 2 N: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
45.8 mm (1.8 in)
5 years
60.5 mm (2.4 in)
10 years
69.9 mm (2.8 in)
25 years
81.6 mm (3.2 in)
50 years
90.1 mm (3.5 in)
100 years
98.4 mm (3.9 in)
Longer than the 52 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, 52 years of values from 1910 to 1984.
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: 90.2 mm (3.6 in) in 1943; 87.4 mm (3.4 in) in 1979; 85.9 mm (3.4 in) in 1951.
Download the Data
Data for Hannah 2 N standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Hannah 2 N 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.