Record envelope, standing records and threshold days for Casper 2 E (USC00481565), Wyoming, United States, with 82 years of record.
Key Facts for Casper 2 E
Casper 2 E (USC00481565) is a weather station in Wyoming, United States at 42.85 latitude and -106.27 longitude, 1,586 m (5,203 ft) above sea level.
The station reports from 1900 to 1981, 82 years of record.
1,464 records set at Casper 2 E still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Casper 2 E set a daily record high maximum temperature of 14.4 C (57.9 F) on 22 January 1981.
About the Station
Location: Wyoming, United States, 42.85 latitude, -106.27 longitude.
Elevation: 1,586 m (5,203 ft).
Period of record: 1900 to 1981, 82 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 Casper 2 E. 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 Casper 2 E, 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)
-38.3 C (-36.9 F)
n/a
n/a
Feb
18.9 C (66.0 F)
-40.6 C (-41.1 F)
n/a
n/a
Mar
23.9 C (75.0 F)
-30.0 C (-22.0 F)
n/a
n/a
Apr
28.9 C (84.0 F)
-22.2 C (-8.0 F)
n/a
n/a
May
37.2 C (99.0 F)
-9.4 C (15.1 F)
n/a
n/a
Jun
38.9 C (102.0 F)
-4.4 C (24.1 F)
n/a
n/a
Jul
41.7 C (107.1 F)
-3.3 C (26.1 F)
n/a
n/a
Aug
42.8 C (109.0 F)
0.0 C (32.0 F)
n/a
n/a
Sep
39.4 C (102.9 F)
-10.0 C (14.0 F)
n/a
n/a
Oct
30.6 C (87.1 F)
-22.2 C (-8.0 F)
n/a
n/a
Nov
26.7 C (80.1 F)
-27.8 C (-18.0 F)
n/a
n/a
Dec
19.4 C (66.9 F)
-37.2 C (-35.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Casper 2 E still stand. 1911 holds the most, with 82.
Standing records at Casper 2 E by the year they were set
Year set
Standing records
1900
2
1901
26
1902
11
1909
11
1910
2
1911
82
1912
73
1913
5
1914
19
1915
68
1916
22
1917
25
1918
29
1920
17
1921
23
1922
25
1923
17
1924
22
1925
16
1926
19
1927
22
1928
11
1929
20
1930
27
1931
25
1932
20
1933
27
1934
35
1935
24
1936
40
1937
18
1938
15
1939
15
1948
5
1949
21
1950
32
1951
30
1952
24
1953
22
1954
27
1955
21
1956
22
1957
12
1958
25
1959
30
1960
22
1961
12
1962
34
1963
22
1964
14
1965
23
1966
27
1967
15
1968
15
1969
24
1970
18
1971
16
1972
33
1973
15
1974
9
1975
20
1976
12
1977
19
1978
18
1979
9
1980
1
1981
2
Wettest Day of Each Month
Apr: 88.9 mm (3.5 in)
The wettest day on record for each calendar month at Casper 2 E. The most was 88.9 mm (3.5 in) on 20 April 1933.
Record daily precipitation for each month at Casper 2 E
Month
Record daily precipitation (mm)
Date
Jan
19.1 mm (0.8 in)
24 January 1934
Feb
28.7 mm (1.1 in)
13 February 1952
Mar
37.1 mm (1.5 in)
18 March 1954
Apr
88.9 mm (3.5 in)
20 April 1933
May
56.6 mm (2.2 in)
22 May 1952
Jun
40.6 mm (1.6 in)
12 June 1970
Jul
64.8 mm (2.6 in)
25 July 1901
Aug
71.9 mm (2.8 in)
3 August 1972
Sep
67.3 mm (2.6 in)
28 September 1923
Oct
49.5 mm (1.9 in)
6 October 1962
Nov
31.5 mm (1.2 in)
3 November 1956
Dec
20.3 mm (0.8 in)
23 December 1911
Period of Record Coverage
1900 to 1981
Complete yearUnder 90 percent of days
68 years of record at Casper 2 E, 1900 to 1981. 21 years have data for under 90 percent of days and are left out of rankings: 1900, 1901, 1902, 1909, 1910, 1912, 1913, 1915 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 42 complete years at Casper 2 E, 1911 to 1978. Blue stripes are years cooler than the station's own mean of 8.6 C (47.6 F); red stripes are warmer. The coolest year was 1951, at 7.2 C (44.9 F), and the warmest was 1933, at 9.9 C (49.8 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Casper 2 E as warming stripes, 1911 to 1978
Year
Annual mean temperature
Difference from the station mean
1911
9.8 C
+1.18 C
1914
8.6 C
-0.05 C
1921
9.9 C
+1.20 C
1922
8.5 C
-0.20 C
1923
8.0 C
-0.62 C
1924
8.0 C
-0.70 C
1925
9.7 C
+1.02 C
1926
9.4 C
+0.71 C
1929
7.9 C
-0.77 C
1930
8.5 C
-0.19 C
1931
9.6 C
+0.99 C
1933
9.9 C
+1.26 C
1935
8.7 C
+0.00 C
1949
7.6 C
-1.01 C
1950
7.7 C
-0.94 C
1951
7.2 C
-1.46 C
1952
8.5 C
-0.19 C
1953
9.4 C
+0.79 C
1954
9.9 C
+1.24 C
1955
8.1 C
-0.56 C
1956
8.7 C
+0.08 C
1957
8.2 C
-0.47 C
1958
8.4 C
-0.29 C
1959
7.9 C
-0.77 C
1960
8.6 C
-0.10 C
1961
8.5 C
-0.15 C
1962
8.6 C
-0.03 C
1963
9.7 C
+1.05 C
1964
8.0 C
-0.69 C
1966
9.2 C
+0.56 C
1967
8.6 C
-0.06 C
1968
8.1 C
-0.55 C
1969
9.0 C
+0.36 C
1970
8.4 C
-0.23 C
1971
8.1 C
-0.53 C
1972
8.1 C
-0.55 C
1973
8.5 C
-0.15 C
1974
8.9 C
+0.22 C
1975
8.5 C
-0.18 C
1976
9.2 C
+0.57 C
1977
9.8 C
+1.13 C
1978
7.7 C
-0.96 C
The fitted trend in annual mean temperature here over 1911 to 1978 is -0.07 C (-0.19 to 0.04) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.3 to 0.1) per decade. The slope is a straight line fitted to 42 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Casper 2 E
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.07 C (-0.19 to 0.04) per decade
-0.1 F (-0.3 to 0.1) per decade
1911 to 1978
42
Not clearly different from zero
Mean daily maximum
-0.04 C (-0.20 to 0.11) per decade
-0.1 F (-0.4 to 0.2) per decade
1911 to 1978
42
Not clearly different from zero
Mean daily minimum
-0.10 C (-0.22 to 0.03) per decade
-0.18 F (-0.40 to 0.05) per decade
1911 to 1978
42
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
1900 to 1981
Yearly extremes at Casper 2 E: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
42.8 C (109.0 F)
1912
37.2 C (99.0 F)
68
Coldest night (TNn)
-40.6 C (-41.1 F)
1936
-28.9 C (-20.0 F)
68
Wettest day (Rx1day)
88.9 mm (3.5 in)
1933
30.5 mm (1.2 in)
69
Wettest five days (Rx5day)
131.9 mm (5.2 in)
1972
41.3 mm (1.6 in)
68
Longest dry spell (CDD)
61 days
1911
31 days
69
Hottest day (TXx)
The hottest day of the year at Casper 2 E, 1900 to 1981. The record is 42.8 C (109.0 F) in 1912, marked on the chart; the median year is 37.2 C (99.0 F).
Hottest day (TXx) at Casper 2 E by year
Year
Hottest day (TXx)
1900
18.9 C (66.0 F)
1901
39.4 C (102.9 F)
1902
33.9 C (93.0 F)
1909
28.9 C (84.0 F)
1910
12.8 C (55.0 F)
1911
41.7 C (107.1 F)
1912
42.8 C (109.0 F)
1913
36.7 C (98.1 F)
1914
35.0 C (95.0 F)
1915
31.1 C (88.0 F)
1916
37.8 C (100.0 F)
1917
35.0 C (95.0 F)
1918
36.7 C (98.1 F)
1919
13.3 C (55.9 F)
1920
36.7 C (98.1 F)
1921
35.6 C (96.1 F)
1922
35.6 C (96.1 F)
1923
34.4 C (93.9 F)
1924
33.9 C (93.0 F)
1925
37.8 C (100.0 F)
1926
35.6 C (96.1 F)
1927
35.6 C (96.1 F)
1928
35.6 C (96.1 F)
1929
38.3 C (100.9 F)
1930
37.8 C (100.0 F)
1931
37.8 C (100.0 F)
1932
37.8 C (100.0 F)
1933
38.9 C (102.0 F)
1934
38.9 C (102.0 F)
1935
37.8 C (100.0 F)
1936
38.3 C (100.9 F)
1937
37.8 C (100.0 F)
1938
40.6 C (105.1 F)
1939
39.4 C (102.9 F)
1940
n/a
1948
37.2 C (99.0 F)
1949
38.3 C (100.9 F)
1950
35.6 C (96.1 F)
1951
37.2 C (99.0 F)
1952
37.2 C (99.0 F)
1953
38.9 C (102.0 F)
1954
40.6 C (105.1 F)
1955
36.1 C (97.0 F)
1956
37.8 C (100.0 F)
1957
35.6 C (96.1 F)
1958
36.7 C (98.1 F)
1959
38.9 C (102.0 F)
1960
37.8 C (100.0 F)
1961
37.2 C (99.0 F)
1962
36.7 C (98.1 F)
1963
38.3 C (100.9 F)
1964
37.2 C (99.0 F)
1965
37.2 C (99.0 F)
1966
38.9 C (102.0 F)
1967
35.6 C (96.1 F)
1968
36.1 C (97.0 F)
1969
38.3 C (100.9 F)
1970
38.9 C (102.0 F)
1971
36.1 C (97.0 F)
1972
37.2 C (99.0 F)
1973
37.8 C (100.0 F)
1974
36.7 C (98.1 F)
1975
36.7 C (98.1 F)
1976
37.8 C (100.0 F)
1977
36.7 C (98.1 F)
1978
36.1 C (97.0 F)
1979
35.6 C (96.1 F)
1980
25.6 C (78.1 F)
1981
26.7 C (80.1 F)
Coldest night (TNn)
The coldest night of the year at Casper 2 E, 1900 to 1981. The record is -40.6 C (-41.1 F) in 1936, marked on the chart; the median year is -28.9 C (-20.0 F).
Coldest night (TNn) at Casper 2 E by year
Year
Coldest night (TNn)
1900
-21.7 C (-7.1 F)
1901
-33.9 C (-29.0 F)
1902
-19.4 C (-2.9 F)
1909
-30.0 C (-22.0 F)
1910
-32.2 C (-26.0 F)
1911
-32.2 C (-26.0 F)
1912
-27.8 C (-18.0 F)
1913
-23.9 C (-11.0 F)
1914
-32.2 C (-26.0 F)
1915
-30.0 C (-22.0 F)
1916
-22.2 C (-8.0 F)
1917
-28.3 C (-18.9 F)
1918
-30.6 C (-23.1 F)
1919
-19.4 C (-2.9 F)
1920
-22.8 C (-9.0 F)
1921
-27.2 C (-17.0 F)
1922
-27.2 C (-17.0 F)
1923
-37.2 C (-35.0 F)
1924
-35.6 C (-32.1 F)
1925
-21.7 C (-7.1 F)
1926
-29.4 C (-20.9 F)
1927
-30.0 C (-22.0 F)
1928
-17.8 C (0.0 F)
1929
-27.2 C (-17.0 F)
1930
-36.7 C (-34.1 F)
1931
-21.7 C (-7.1 F)
1932
-27.2 C (-17.0 F)
1933
-32.8 C (-27.0 F)
1934
-29.4 C (-20.9 F)
1935
-31.1 C (-24.0 F)
1936
-40.6 C (-41.1 F)
1937
-32.2 C (-26.0 F)
1938
-32.2 C (-26.0 F)
1939
-30.6 C (-23.1 F)
1940
n/a
1948
-22.8 C (-9.0 F)
1949
-38.3 C (-36.9 F)
1950
-33.9 C (-29.0 F)
1951
-28.9 C (-20.0 F)
1952
-27.8 C (-18.0 F)
1953
-23.3 C (-9.9 F)
1954
-28.3 C (-18.9 F)
1955
-28.3 C (-18.9 F)
1956
-30.0 C (-22.0 F)
1957
-27.8 C (-18.0 F)
1958
-21.1 C (-6.0 F)
1959
-35.6 C (-32.1 F)
1960
-30.0 C (-22.0 F)
1961
-27.8 C (-18.0 F)
1962
-35.0 C (-31.0 F)
1963
-33.3 C (-27.9 F)
1964
-35.0 C (-31.0 F)
1965
-25.0 C (-13.0 F)
1966
-28.9 C (-20.0 F)
1967
-28.3 C (-18.9 F)
1968
-30.0 C (-22.0 F)
1969
-22.2 C (-8.0 F)
1970
-26.7 C (-16.1 F)
1971
-26.1 C (-15.0 F)
1972
-36.7 C (-34.1 F)
1973
-30.6 C (-23.1 F)
1974
-31.7 C (-25.1 F)
1975
-26.1 C (-15.0 F)
1976
-27.2 C (-17.0 F)
1977
-27.8 C (-18.0 F)
1978
-29.4 C (-20.9 F)
1979
-28.9 C (-20.0 F)
1980
-19.4 C (-2.9 F)
1981
-16.7 C (1.9 F)
Wettest day (Rx1day)
The wettest day of the year at Casper 2 E, 1900 to 1981. The record is 88.9 mm (3.5 in) in 1933, marked on the chart; the median year is 30.5 mm (1.2 in).
Wettest day (Rx1day) at Casper 2 E by year
Year
Wettest day (Rx1day)
1900
5.1 mm (0.20 in)
1901
64.8 mm (2.6 in)
1902
17.8 mm (0.7 in)
1909
14.0 mm (0.6 in)
1910
5.1 mm (0.20 in)
1911
26.7 mm (1.1 in)
1912
25.1 mm (1.0 in)
1913
17.5 mm (0.7 in)
1914
33.0 mm (1.3 in)
1915
33.0 mm (1.3 in)
1916
25.4 mm (1.0 in)
1917
20.3 mm (0.8 in)
1918
25.4 mm (1.0 in)
1919
5.1 mm (0.20 in)
1920
27.9 mm (1.1 in)
1921
35.3 mm (1.4 in)
1922
44.5 mm (1.8 in)
1923
67.3 mm (2.6 in)
1924
19.1 mm (0.8 in)
1925
27.9 mm (1.1 in)
1926
49.5 mm (1.9 in)
1927
35.6 mm (1.4 in)
1928
34.3 mm (1.4 in)
1929
32.5 mm (1.3 in)
1930
20.8 mm (0.8 in)
1931
38.1 mm (1.5 in)
1932
38.1 mm (1.5 in)
1933
88.9 mm (3.5 in)
1934
32.3 mm (1.3 in)
1935
22.1 mm (0.9 in)
1936
22.9 mm (0.9 in)
1937
41.1 mm (1.6 in)
1938
27.9 mm (1.1 in)
1939
20.8 mm (0.8 in)
1940
12.4 mm (0.5 in)
1948
15.5 mm (0.6 in)
1949
34.5 mm (1.4 in)
1950
34.8 mm (1.4 in)
1951
20.8 mm (0.8 in)
1952
56.6 mm (2.2 in)
1953
24.1 mm (0.9 in)
1954
37.1 mm (1.5 in)
1955
29.5 mm (1.2 in)
1956
31.5 mm (1.2 in)
1957
30.2 mm (1.2 in)
1958
26.7 mm (1.1 in)
1959
21.6 mm (0.9 in)
1960
29.7 mm (1.2 in)
1961
33.0 mm (1.3 in)
1962
49.5 mm (1.9 in)
1963
18.3 mm (0.7 in)
1964
35.8 mm (1.4 in)
1965
32.0 mm (1.3 in)
1966
22.9 mm (0.9 in)
1967
56.1 mm (2.2 in)
1968
36.6 mm (1.4 in)
1969
33.5 mm (1.3 in)
1970
40.6 mm (1.6 in)
1971
44.2 mm (1.7 in)
1972
71.9 mm (2.8 in)
1973
37.6 mm (1.5 in)
1974
81.3 mm (3.2 in)
1975
30.5 mm (1.2 in)
1976
31.0 mm (1.2 in)
1977
27.9 mm (1.1 in)
1978
52.3 mm (2.1 in)
1979
26.7 mm (1.1 in)
1980
24.1 mm (0.9 in)
1981
11.2 mm (0.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Casper 2 E, 1900 to 1981. The record is 131.9 mm (5.2 in) in 1972, marked on the chart; the median year is 41.3 mm (1.6 in).
Wettest five days (Rx5day) at Casper 2 E by year
Year
Wettest five days (Rx5day)
1900
12.2 mm (0.5 in)
1901
66.1 mm (2.6 in)
1902
36.8 mm (1.4 in)
1909
21.7 mm (0.9 in)
1910
5.1 mm (0.20 in)
1911
50.3 mm (2.0 in)
1912
39.4 mm (1.6 in)
1913
31.3 mm (1.2 in)
1914
44.4 mm (1.7 in)
1915
51.5 mm (2.0 in)
1916
35.1 mm (1.4 in)
1917
46.2 mm (1.8 in)
1918
35.3 mm (1.4 in)
1919
11.5 mm (0.5 in)
1920
45.1 mm (1.8 in)
1921
67.3 mm (2.6 in)
1922
76.1 mm (3.0 in)
1923
90.2 mm (3.6 in)
1924
n/a
1925
28.1 mm (1.1 in)
1926
30.5 mm (1.2 in)
1927
33.0 mm (1.3 in)
1928
50.0 mm (2.0 in)
1929
25.5 mm (1.0 in)
1930
46.5 mm (1.8 in)
1931
49.3 mm (1.9 in)
1932
31.8 mm (1.3 in)
1933
88.9 mm (3.5 in)
1934
36.1 mm (1.4 in)
1935
37.3 mm (1.5 in)
1936
52.9 mm (2.1 in)
1937
73.7 mm (2.9 in)
1938
31.3 mm (1.2 in)
1939
27.0 mm (1.1 in)
1940
19.0 mm (0.7 in)
1948
23.6 mm (0.9 in)
1949
51.0 mm (2.0 in)
1950
41.1 mm (1.6 in)
1951
30.7 mm (1.2 in)
1952
70.5 mm (2.8 in)
1953
27.9 mm (1.1 in)
1954
48.1 mm (1.9 in)
1955
53.1 mm (2.1 in)
1956
37.6 mm (1.5 in)
1957
39.3 mm (1.5 in)
1958
41.4 mm (1.6 in)
1959
38.1 mm (1.5 in)
1960
29.7 mm (1.2 in)
1961
34.5 mm (1.4 in)
1962
49.5 mm (1.9 in)
1963
28.0 mm (1.1 in)
1964
47.8 mm (1.9 in)
1965
40.4 mm (1.6 in)
1966
23.4 mm (0.9 in)
1967
75.1 mm (3.0 in)
1968
46.5 mm (1.8 in)
1969
53.3 mm (2.1 in)
1970
53.3 mm (2.1 in)
1971
88.9 mm (3.5 in)
1972
131.9 mm (5.2 in)
1973
50.5 mm (2.0 in)
1974
94.8 mm (3.7 in)
1975
45.3 mm (1.8 in)
1976
43.9 mm (1.7 in)
1977
42.9 mm (1.7 in)
1978
90.9 mm (3.6 in)
1979
37.7 mm (1.5 in)
1980
24.1 mm (0.9 in)
1981
27.2 mm (1.1 in)
Longest dry spell (CDD)
The longest dry spell of the year at Casper 2 E, 1900 to 1981. The record is 61 days in 1911, marked on the chart; the median year is 31 days.
Longest dry spell (CDD) at Casper 2 E by year
Year
Longest dry spell (CDD)
1900
22 days
1901
41 days
1902
26 days
1909
33 days
1910
28 days
1911
61 days
1912
35 days
1913
25 days
1914
44 days
1915
20 days
1916
47 days
1917
26 days
1918
16 days
1919
32 days
1920
32 days
1921
36 days
1922
20 days
1923
3 days
1924
2 days
1925
3 days
1926
2 days
1927
3 days
1928
1 day
1929
2 days
1930
2 days
1931
23 days
1932
48 days
1933
36 days
1934
52 days
1935
29 days
1936
35 days
1937
26 days
1938
26 days
1939
34 days
1940
36 days
1948
36 days
1949
24 days
1950
37 days
1951
31 days
1952
31 days
1953
43 days
1954
31 days
1955
29 days
1956
33 days
1957
35 days
1958
36 days
1959
32 days
1960
60 days
1961
32 days
1962
39 days
1963
34 days
1964
27 days
1965
56 days
1966
20 days
1967
38 days
1968
22 days
1969
35 days
1970
36 days
1971
27 days
1972
25 days
1973
21 days
1974
24 days
1975
52 days
1976
35 days
1977
36 days
1978
40 days
1979
27 days
1980
16 days
1981
14 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
42 years with a frost
Across 42 years with a frost, the median last spring frost at Casper 2 E falls on 16 May and the median first autumn frost on 18 September, which leaves a median of 122 days between them.
Fitted over all years, the growing season changes by +0.7 days per decade at this station.
Frost dates and growing season at Casper 2 E
Measure
Median, all years
Earliest period
Recent period (1935 to 1978)
Recent against earliest
Fitted trend
Last spring frost
16 May
n/a
19 May
n/a
-0.8 days per decade
First autumn frost
18 September
n/a
15 September
n/a
-0.1 days per decade
Growing days
122 days
n/a
119 days
n/a
+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
39 years, 1914 to 1978
A day with at least 32.3 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 103.4 mm (4.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Casper 2 E: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
32.3 mm (1.3 in)
5 years
45.3 mm (1.8 in)
10 years
55.8 mm (2.2 in)
25 years
72.0 mm (2.8 in)
50 years
86.5 mm (3.4 in)
Longer than the 39 years of record
100 years
103.4 mm (4.1 in)
Longer than the 39 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, 39 years of values from 1914 to 1978.
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: 88.9 mm (3.5 in) in 1933; 81.3 mm (3.2 in) in 1974; 71.9 mm (2.8 in) in 1972.
Station Changes
2 suspected
2 changes were suspected in the annual mean temperature of Casper 2 E, at 1949 and 1966. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1949 ran 0.3 C (0.6 F) lower than in the years before (possible change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1966 ran 0.5 C (0.8 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Casper 2 E, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1949
-0.3
-0.6
possible
5
1966
+0.5
+0.8
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 Casper 2 E standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Casper 2 E 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.