Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Semans. 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 Semans, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
5.6 C (42.1 F)
-44.4 C (-47.9 F)
n/a
n/a
Feb
12.8 C (55.0 F)
-45.0 C (-49.0 F)
n/a
n/a
Mar
20.0 C (68.0 F)
-38.9 C (-38.0 F)
n/a
n/a
Apr
32.8 C (91.0 F)
-28.9 C (-20.0 F)
n/a
n/a
May
37.8 C (100.0 F)
-12.2 C (10.0 F)
n/a
n/a
Jun
40.0 C (104.0 F)
-5.0 C (23.0 F)
n/a
n/a
Jul
42.2 C (108.0 F)
-1.1 C (30.0 F)
n/a
n/a
Aug
41.1 C (106.0 F)
-5.0 C (23.0 F)
n/a
n/a
Sep
35.6 C (96.1 F)
-13.9 C (7.0 F)
n/a
n/a
Oct
31.7 C (89.1 F)
-22.2 C (-8.0 F)
n/a
n/a
Nov
21.1 C (70.0 F)
-33.3 C (-27.9 F)
n/a
n/a
Dec
13.3 C (55.9 F)
-43.5 C (-46.3 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Semans still stand. 1931 holds the most, with 57.
Standing records at Semans by the year they were set
Year set
Standing records
1923
10
1924
29
1925
24
1926
20
1927
14
1928
26
1929
16
1930
20
1931
57
1932
12
1933
25
1934
48
1935
23
1936
26
1937
31
1938
10
1939
43
1940
55
1941
33
1942
31
1943
29
1944
19
1945
29
1946
26
1947
21
1948
21
1949
35
1950
34
1951
44
1952
24
1953
21
1954
40
1955
13
1956
23
1957
20
1958
20
1959
19
1960
10
1961
27
1962
19
1963
9
1965
30
1966
23
1967
18
1968
26
1969
26
1970
9
1971
13
1972
36
1973
18
1974
28
1975
12
1976
15
1977
28
1978
15
1979
14
1980
26
1981
25
1982
13
1983
33
All-Time Record Progression
2 new records
2 all-time records were set at Semans between 25 January 1972 and 8 July 1983. Each dot is a new record.
When Semans set new all-time records
Date
Kind
Detail
1972-01-25
Record low maximum temperature
Record low maximum temperature -37.8 C (-36.0 F)
1983-07-08
Record daily precipitation
Record daily precipitation 115.9 mm (4.6 in)
Wettest Day of Each Month
Jul: 115.9 mm (4.6 in)
The wettest day on record for each calendar month at Semans. The most was 115.9 mm (4.6 in) on 8 July 1983.
Record daily precipitation for each month at Semans
Month
Record daily precipitation (mm)
Date
Jan
20.3 mm (0.8 in)
22 January 1951
Feb
30.5 mm (1.2 in)
19 February 1939
Mar
61.0 mm (2.4 in)
15 March 1941
Apr
35.6 mm (1.4 in)
18 April 1925
May
45.7 mm (1.8 in)
4 May 1977
Jun
79.8 mm (3.1 in)
29 June 1935
Jul
115.9 mm (4.6 in)
8 July 1983
Aug
55.9 mm (2.2 in)
5 August 1922
Sep
48.3 mm (1.9 in)
10 September 1974
Oct
40.9 mm (1.6 in)
2 October 1969
Nov
20.3 mm (0.8 in)
6 November 1973
Dec
25.4 mm (1.0 in)
13 December 1955
Period of Record Coverage
1923 to 1983
Complete yearUnder 90 percent of days
59 years of record at Semans, 1923 to 1983. 12 years have data for under 90 percent of days and are left out of rankings: 1923, 1926, 1928, 1932, 1933, 1934, 1936, 1937 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 40 complete years at Semans, 1924 to 1983. Blue stripes are years cooler than the station's own mean of 1.6 C (34.9 F); red stripes are warmer. The coolest year was 1951, at -0.9 C (30.3 F), and the warmest was 1931, at 5.6 C (42.1 F). The strongest colour marks a difference of 4.1 C (7.4 F).
Annual mean temperature at Semans as warming stripes, 1924 to 1983
Year
Annual mean temperature
Difference from the station mean
1924
1.3 C
-0.35 C
1925
1.7 C
+0.09 C
1927
0.3 C
-1.33 C
1930
2.7 C
+1.11 C
1931
5.6 C
+4.01 C
1941
2.9 C
+1.30 C
1944
2.8 C
+1.21 C
1945
1.0 C
-0.62 C
1947
1.2 C
-0.40 C
1948
1.5 C
-0.08 C
1949
1.8 C
+0.24 C
1950
-0.8 C
-2.45 C
1951
-0.9 C
-2.55 C
1952
2.4 C
+0.82 C
1953
2.6 C
+1.04 C
1954
1.5 C
-0.10 C
1955
0.3 C
-1.35 C
1956
0.7 C
-0.92 C
1957
1.7 C
+0.08 C
1958
2.5 C
+0.90 C
1959
1.9 C
+0.29 C
1965
-0.1 C
-1.66 C
1966
0.4 C
-1.21 C
1967
0.9 C
-0.70 C
1968
2.2 C
+0.57 C
1969
1.2 C
-0.37 C
1970
0.9 C
-0.73 C
1971
1.3 C
-0.34 C
1972
0.2 C
-1.43 C
1973
2.1 C
+0.51 C
1974
1.4 C
-0.23 C
1975
1.3 C
-0.31 C
1976
2.6 C
+1.04 C
1977
2.8 C
+1.22 C
1978
1.4 C
-0.20 C
1979
0.8 C
-0.83 C
1980
2.8 C
+1.20 C
1981
4.5 C
+2.88 C
1982
0.7 C
-0.95 C
1983
2.1 C
+0.49 C
The fitted trend in annual mean temperature here over 1924 to 1983 is -0.04 C (-0.28 to 0.21) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.5 to 0.4) per decade. The slope is a straight line fitted to 40 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Semans
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.04 C (-0.28 to 0.21) per decade
-0.1 F (-0.5 to 0.4) per decade
1924 to 1983
40
Not clearly different from zero
Mean daily maximum
-0.1 C (-0.4 to 0.1) per decade
-0.2 F (-0.8 to 0.3) per decade
1924 to 1983
40
Not clearly different from zero
Mean daily minimum
0.1 C (-0.2 to 0.3) per decade
0.1 F (-0.3 to 0.5) per decade
1924 to 1983
40
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
1922 to 1983
Yearly extremes at Semans: 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)
1941
35.6 C (96.1 F)
59
Coldest night (TNn)
-45.0 C (-49.0 F)
1947
-38.9 C (-38.0 F)
60
Wettest day (Rx1day)
115.9 mm (4.6 in)
1983
35.6 mm (1.4 in)
62
Wettest five days (Rx5day)
169.9 mm (6.7 in)
1983
47.3 mm (1.9 in)
62
Longest dry spell (CDD)
69 days
1974
33 days
62
Hottest day (TXx)
The hottest day of the year at Semans, 1922 to 1983. The record is 42.2 C (108.0 F) in 1941, marked on the chart; the median year is 35.6 C (96.1 F).
Hottest day (TXx) at Semans by year
Year
Hottest day (TXx)
1922
n/a
1923
31.7 C (89.1 F)
1924
33.9 C (93.0 F)
1925
36.7 C (98.1 F)
1926
32.8 C (91.0 F)
1927
31.7 C (89.1 F)
1928
35.0 C (95.0 F)
1929
36.1 C (97.0 F)
1930
36.1 C (97.0 F)
1931
40.6 C (105.1 F)
1932
38.9 C (102.0 F)
1933
40.0 C (104.0 F)
1934
37.8 C (100.0 F)
1935
n/a
1936
35.6 C (96.1 F)
1937
38.3 C (100.9 F)
1938
33.9 C (93.0 F)
1939
36.7 C (98.1 F)
1940
37.8 C (100.0 F)
1941
42.2 C (108.0 F)
1942
31.7 C (89.1 F)
1943
35.6 C (96.1 F)
1944
36.7 C (98.1 F)
1945
38.3 C (100.9 F)
1946
38.3 C (100.9 F)
1947
40.0 C (104.0 F)
1948
36.7 C (98.1 F)
1949
41.1 C (106.0 F)
1950
36.7 C (98.1 F)
1951
33.9 C (93.0 F)
1952
35.6 C (96.1 F)
1953
31.1 C (88.0 F)
1954
32.2 C (90.0 F)
1955
33.9 C (93.0 F)
1956
35.0 C (95.0 F)
1957
35.6 C (96.1 F)
1958
36.1 C (97.0 F)
1959
36.1 C (97.0 F)
1960
37.2 C (99.0 F)
1961
38.3 C (100.9 F)
1962
31.7 C (89.1 F)
1963
32.2 C (90.0 F)
1964
n/a
1965
33.3 C (91.9 F)
1966
35.0 C (95.0 F)
1967
35.6 C (96.1 F)
1968
33.9 C (93.0 F)
1969
35.6 C (96.1 F)
1970
34.4 C (93.9 F)
1971
34.4 C (93.9 F)
1972
37.8 C (100.0 F)
1973
33.9 C (93.0 F)
1974
33.9 C (93.0 F)
1975
35.0 C (95.0 F)
1976
34.4 C (93.9 F)
1977
31.1 C (88.0 F)
1978
35.0 C (95.0 F)
1979
36.7 C (98.1 F)
1980
37.5 C (99.5 F)
1981
34.0 C (93.2 F)
1982
32.5 C (90.5 F)
1983
36.0 C (96.8 F)
Coldest night (TNn)
The coldest night of the year at Semans, 1922 to 1983. The record is -45.0 C (-49.0 F) in 1947, marked on the chart; the median year is -38.9 C (-38.0 F).
Coldest night (TNn) at Semans by year
Year
Coldest night (TNn)
1922
n/a
1923
-32.8 C (-27.0 F)
1924
-36.1 C (-33.0 F)
1925
-35.0 C (-31.0 F)
1926
-34.4 C (-29.9 F)
1927
-38.9 C (-38.0 F)
1928
-36.1 C (-33.0 F)
1929
-38.3 C (-36.9 F)
1930
-38.9 C (-38.0 F)
1931
-26.1 C (-15.0 F)
1932
-37.8 C (-36.0 F)
1933
-37.8 C (-36.0 F)
1934
-39.4 C (-38.9 F)
1935
-41.7 C (-43.1 F)
1936
-42.8 C (-45.0 F)
1937
-37.8 C (-36.0 F)
1938
-40.0 C (-40.0 F)
1939
-41.1 C (-42.0 F)
1940
-38.9 C (-38.0 F)
1941
-40.0 C (-40.0 F)
1942
-37.8 C (-36.0 F)
1943
-39.4 C (-38.9 F)
1944
-37.2 C (-35.0 F)
1945
-37.2 C (-35.0 F)
1946
-37.2 C (-35.0 F)
1947
-45.0 C (-49.0 F)
1948
-37.2 C (-35.0 F)
1949
-40.0 C (-40.0 F)
1950
-44.4 C (-47.9 F)
1951
-40.0 C (-40.0 F)
1952
-38.9 C (-38.0 F)
1953
-40.0 C (-40.0 F)
1954
-44.4 C (-47.9 F)
1955
-37.2 C (-35.0 F)
1956
-38.9 C (-38.0 F)
1957
-37.8 C (-36.0 F)
1958
-35.0 C (-31.0 F)
1959
-38.9 C (-38.0 F)
1960
-34.4 C (-29.9 F)
1961
-35.6 C (-32.1 F)
1962
-41.1 C (-42.0 F)
1963
-20.6 C (-5.1 F)
1964
n/a
1965
-38.9 C (-38.0 F)
1966
-42.8 C (-45.0 F)
1967
-40.0 C (-40.0 F)
1968
-40.6 C (-41.1 F)
1969
-41.7 C (-43.1 F)
1970
-42.8 C (-45.0 F)
1971
-41.1 C (-42.0 F)
1972
-44.4 C (-47.9 F)
1973
-40.0 C (-40.0 F)
1974
-42.2 C (-44.0 F)
1975
-36.1 C (-33.0 F)
1976
-37.2 C (-35.0 F)
1977
-38.9 C (-38.0 F)
1978
-40.0 C (-40.0 F)
1979
-40.0 C (-40.0 F)
1980
-39.5 C (-39.1 F)
1981
-37.0 C (-34.6 F)
1982
-39.0 C (-38.2 F)
1983
-43.5 C (-46.3 F)
Wettest day (Rx1day)
The wettest day of the year at Semans, 1922 to 1983. The record is 115.9 mm (4.6 in) in 1983, marked on the chart; the median year is 35.6 mm (1.4 in).
Wettest day (Rx1day) at Semans by year
Year
Wettest day (Rx1day)
1922
55.9 mm (2.2 in)
1923
44.5 mm (1.8 in)
1924
16.5 mm (0.6 in)
1925
35.6 mm (1.4 in)
1926
25.7 mm (1.0 in)
1927
23.9 mm (0.9 in)
1928
15.2 mm (0.6 in)
1929
35.6 mm (1.4 in)
1930
38.1 mm (1.5 in)
1931
20.8 mm (0.8 in)
1932
29.2 mm (1.1 in)
1933
25.4 mm (1.0 in)
1934
50.8 mm (2.0 in)
1935
79.8 mm (3.1 in)
1936
38.1 mm (1.5 in)
1937
17.8 mm (0.7 in)
1938
42.4 mm (1.7 in)
1939
39.6 mm (1.6 in)
1940
47.0 mm (1.9 in)
1941
61.0 mm (2.4 in)
1942
37.1 mm (1.5 in)
1943
15.2 mm (0.6 in)
1944
22.6 mm (0.9 in)
1945
30.5 mm (1.2 in)
1946
27.4 mm (1.1 in)
1947
52.1 mm (2.1 in)
1948
22.9 mm (0.9 in)
1949
25.4 mm (1.0 in)
1950
17.8 mm (0.7 in)
1951
46.5 mm (1.8 in)
1952
50.8 mm (2.0 in)
1953
40.6 mm (1.6 in)
1954
38.1 mm (1.5 in)
1955
29.2 mm (1.1 in)
1956
20.3 mm (0.8 in)
1957
45.5 mm (1.8 in)
1958
30.0 mm (1.2 in)
1959
41.1 mm (1.6 in)
1960
35.6 mm (1.4 in)
1961
30.5 mm (1.2 in)
1962
31.8 mm (1.3 in)
1963
42.2 mm (1.7 in)
1964
7.6 mm (0.30 in)
1965
43.9 mm (1.7 in)
1966
62.7 mm (2.5 in)
1967
21.3 mm (0.8 in)
1968
25.1 mm (1.0 in)
1969
40.9 mm (1.6 in)
1970
29.0 mm (1.1 in)
1971
45.0 mm (1.8 in)
1972
20.3 mm (0.8 in)
1973
48.3 mm (1.9 in)
1974
48.3 mm (1.9 in)
1975
21.1 mm (0.8 in)
1976
20.6 mm (0.8 in)
1977
45.7 mm (1.8 in)
1978
23.6 mm (0.9 in)
1979
16.0 mm (0.6 in)
1980
25.2 mm (1.0 in)
1981
57.0 mm (2.2 in)
1982
45.0 mm (1.8 in)
1983
115.9 mm (4.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Semans, 1922 to 1983. The record is 169.9 mm (6.7 in) in 1983, marked on the chart; the median year is 47.3 mm (1.9 in).
Wettest five days (Rx5day) at Semans by year
Year
Wettest five days (Rx5day)
1922
57.9 mm (2.3 in)
1923
65.3 mm (2.6 in)
1924
24.1 mm (0.9 in)
1925
35.6 mm (1.4 in)
1926
35.6 mm (1.4 in)
1927
37.4 mm (1.5 in)
1928
20.3 mm (0.8 in)
1929
61.0 mm (2.4 in)
1930
45.4 mm (1.8 in)
1931
26.0 mm (1.0 in)
1932
47.0 mm (1.9 in)
1933
41.1 mm (1.6 in)
1934
50.8 mm (2.0 in)
1935
79.8 mm (3.1 in)
1936
44.5 mm (1.8 in)
1937
22.9 mm (0.9 in)
1938
57.1 mm (2.2 in)
1939
58.9 mm (2.3 in)
1940
47.8 mm (1.9 in)
1941
66.1 mm (2.6 in)
1942
85.0 mm (3.3 in)
1943
28.4 mm (1.1 in)
1944
38.1 mm (1.5 in)
1945
40.4 mm (1.6 in)
1946
29.9 mm (1.2 in)
1947
75.0 mm (3.0 in)
1948
30.5 mm (1.2 in)
1949
45.8 mm (1.8 in)
1950
35.1 mm (1.4 in)
1951
56.6 mm (2.2 in)
1952
63.6 mm (2.5 in)
1953
77.7 mm (3.1 in)
1954
66.6 mm (2.6 in)
1955
52.1 mm (2.1 in)
1956
35.5 mm (1.4 in)
1957
48.3 mm (1.9 in)
1958
33.8 mm (1.3 in)
1959
74.6 mm (2.9 in)
1960
58.5 mm (2.3 in)
1961
30.5 mm (1.2 in)
1962
39.8 mm (1.6 in)
1963
46.5 mm (1.8 in)
1964
16.5 mm (0.6 in)
1965
63.7 mm (2.5 in)
1966
98.2 mm (3.9 in)
1967
46.3 mm (1.8 in)
1968
35.8 mm (1.4 in)
1969
55.6 mm (2.2 in)
1970
49.5 mm (1.9 in)
1971
83.3 mm (3.3 in)
1972
21.3 mm (0.8 in)
1973
73.3 mm (2.9 in)
1974
56.7 mm (2.2 in)
1975
29.4 mm (1.2 in)
1976
47.6 mm (1.9 in)
1977
63.0 mm (2.5 in)
1978
31.2 mm (1.2 in)
1979
27.7 mm (1.1 in)
1980
38.5 mm (1.5 in)
1981
74.9 mm (2.9 in)
1982
66.7 mm (2.6 in)
1983
169.9 mm (6.7 in)
Longest dry spell (CDD)
The longest dry spell of the year at Semans, 1922 to 1983. The record is 69 days in 1974, marked on the chart; the median year is 33 days.
Longest dry spell (CDD) at Semans by year
Year
Longest dry spell (CDD)
1922
20 days
1923
29 days
1924
47 days
1925
36 days
1926
29 days
1927
45 days
1928
41 days
1929
48 days
1930
28 days
1931
32 days
1932
51 days
1933
29 days
1934
31 days
1935
36 days
1936
34 days
1937
34 days
1938
35 days
1939
24 days
1940
59 days
1941
29 days
1942
43 days
1943
27 days
1944
52 days
1945
32 days
1946
31 days
1947
19 days
1948
46 days
1949
37 days
1950
22 days
1951
45 days
1952
65 days
1953
22 days
1954
39 days
1955
23 days
1956
36 days
1957
26 days
1958
27 days
1959
34 days
1960
32 days
1961
27 days
1962
18 days
1963
18 days
1964
14 days
1965
49 days
1966
23 days
1967
35 days
1968
24 days
1969
36 days
1970
20 days
1971
34 days
1972
38 days
1973
32 days
1974
69 days
1975
31 days
1976
39 days
1977
31 days
1978
27 days
1979
36 days
1980
49 days
1981
35 days
1982
34 days
1983
24 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
40 years with a frost
Across 40 years with a frost, the median last spring frost at Semans falls on 26 May and the median first autumn frost on 13 September, which leaves a median of 110 days between them.
Fitted over all years, the growing season changes by -0.2 days per decade at this station.
Frost dates and growing season at Semans
Measure
Median, all years
Earliest period
Recent period (1949 to 1983)
Recent against earliest
Fitted trend
Last spring frost
26 May
n/a
24 May
n/a
-1.1 days per decade
First autumn frost
13 September
n/a
12 September
n/a
-1.4 days per decade
Growing days
110 days
n/a
110 days
n/a
-0.2 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
47 years, 1924 to 1983
A day with at least 34.2 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 97.5 mm (3.8 in) of rain is expected about once in 100 years.
Rainfall return levels at Semans: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
34.2 mm (1.3 in)
5 years
48.9 mm (1.9 in)
10 years
59.5 mm (2.3 in)
25 years
73.9 mm (2.9 in)
50 years
85.4 mm (3.4 in)
Longer than the 47 years of record
100 years
97.5 mm (3.8 in)
Longer than the 47 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, 47 years of values from 1924 to 1983.
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: 115.9 mm (4.6 in) in 1983; 79.8 mm (3.1 in) in 1935; 62.7 mm (2.5 in) in 1966.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Semans standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Semans 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.