Record envelope, standing records and threshold days for Kasilof 3 NW (USC00504425), Alaska, United States, with 73 years of record.
Key Facts for Kasilof 3 NW
Kasilof 3 NW (USC00504425) is a weather station in Alaska, United States at 60.37 latitude and -151.38 longitude, 21 m (70 ft) above sea level.
The station reports from 1925 to 1997, 73 years of record.
1,464 records set at Kasilof 3 NW still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Kasilof 3 NW tied a daily record snow depth of 30.5 cm (12.0 in) on 31 October 1997.
About the Station
Location: Alaska, United States, 60.37 latitude, -151.38 longitude.
Elevation: 21 m (70 ft).
Period of record: 1925 to 1997, 73 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 Kasilof 3 NW. 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 Kasilof 3 NW, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
8.9 C (48.0 F)
-42.8 C (-45.0 F)
n/a
n/a
Feb
12.8 C (55.0 F)
-41.7 C (-43.1 F)
n/a
n/a
Mar
13.3 C (55.9 F)
-42.2 C (-44.0 F)
n/a
n/a
Apr
17.8 C (64.0 F)
-27.2 C (-17.0 F)
n/a
n/a
May
25.6 C (78.1 F)
-11.7 C (10.9 F)
n/a
n/a
Jun
30.6 C (87.1 F)
-6.1 C (21.0 F)
n/a
n/a
Jul
28.3 C (82.9 F)
-6.7 C (19.9 F)
n/a
n/a
Aug
28.3 C (82.9 F)
-6.7 C (19.9 F)
n/a
n/a
Sep
22.2 C (72.0 F)
-11.7 C (10.9 F)
n/a
n/a
Oct
20.0 C (68.0 F)
-23.3 C (-9.9 F)
n/a
n/a
Nov
11.7 C (53.1 F)
-33.3 C (-27.9 F)
n/a
n/a
Dec
9.4 C (48.9 F)
-38.3 C (-36.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Kasilof 3 NW still stand. 1926 holds the most, with 89.
Standing records at Kasilof 3 NW by the year they were set
Year set
Standing records
1925
6
1926
89
1929
10
1930
19
1931
21
1932
25
1933
33
1934
19
1935
2
1936
16
1938
12
1939
9
1940
35
1941
24
1942
34
1943
26
1944
25
1945
24
1946
20
1947
41
1948
14
1951
18
1952
20
1953
21
1954
25
1955
28
1956
35
1957
34
1958
17
1959
20
1960
13
1961
34
1962
21
1963
26
1964
31
1966
13
1967
22
1968
21
1969
50
1970
17
1971
29
1972
19
1973
17
1974
21
1975
32
1976
13
1977
18
1978
11
1979
23
1980
24
1981
23
1982
25
1983
9
1984
10
1985
47
1986
23
1987
12
1988
5
1989
12
1990
16
1991
4
1992
35
1993
20
1994
11
1995
14
1996
10
1997
11
All-Time Record Progression
8 new records
8 all-time records were set at Kasilof 3 NW between 29 December 1970 and 7 March 1990. Each dot is a new record.
When Kasilof 3 NW set new all-time records
Date
Kind
Detail
1970-12-29
Record low maximum temperature
Record low maximum temperature -27.8 C (-18.0 F)
1971-03-07
Record low minimum temperature
Record low minimum temperature -42.2 C (-44.0 F)
1972-01-11
Record low maximum temperature
Record low maximum temperature -30.0 C (-22.0 F)
1975-01-04
Record low minimum temperature
Record low minimum temperature -42.8 C (-45.0 F)
1978-02-06
Record daily snowfall
Record daily snowfall 30.5 cm (12.0 in)
1987-06-02
Record daily precipitation
Record daily precipitation 81.3 mm (3.2 in)
1990-03-04
Record snow depth
Record snow depth 114.3 cm (45.0 in)
1990-03-07
Record snow depth
Record snow depth 116.8 cm (46.0 in)
Wettest Day of Each Month
Jun: 81.3 mm (3.2 in)
The wettest day on record for each calendar month at Kasilof 3 NW. The most was 81.3 mm (3.2 in) on 2 June 1987.
Record daily precipitation for each month at Kasilof 3 NW
Month
Record daily precipitation (mm)
Date
Jan
43.2 mm (1.7 in)
16 January 1990
Feb
26.4 mm (1.0 in)
20 February 1962
Mar
50.8 mm (2.0 in)
4 March 1990
Apr
20.3 mm (0.8 in)
26 April 1984
May
35.6 mm (1.4 in)
24 May 1995
Jun
81.3 mm (3.2 in)
2 June 1987
Jul
30.5 mm (1.2 in)
10 July 1981
Aug
50.8 mm (2.0 in)
18 August 1984
Sep
63.8 mm (2.5 in)
21 September 1942
Oct
53.3 mm (2.1 in)
10 October 1986
Nov
39.9 mm (1.6 in)
7 November 1979
Dec
53.3 mm (2.1 in)
15 December 1966
Period of Record Coverage
1925 to 1997
Complete yearUnder 90 percent of days
67 years of record at Kasilof 3 NW, 1925 to 1997. 22 years have data for under 90 percent of days and are left out of rankings: 1925, 1926, 1929, 1930, 1931, 1935, 1936, 1938 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 45 complete years at Kasilof 3 NW, 1932 to 1996. Blue stripes are years cooler than the station's own mean of 1.0 C (33.8 F); red stripes are warmer. The coolest year was 1933, at -1.5 C (29.4 F), and the warmest was 1993, at 2.8 C (37.1 F). The strongest colour marks a difference of 2.5 C (4.5 F).
Annual mean temperature at Kasilof 3 NW as warming stripes, 1932 to 1996
Year
Annual mean temperature
Difference from the station mean
1932
0.0 C
-1.04 C
1933
-1.5 C
-2.47 C
1934
1.0 C
+0.00 C
1943
2.5 C
+1.52 C
1944
2.6 C
+1.55 C
1945
1.8 C
+0.83 C
1946
0.8 C
-0.20 C
1947
1.9 C
+0.87 C
1951
0.1 C
-0.94 C
1952
1.7 C
+0.68 C
1953
2.1 C
+1.05 C
1954
0.6 C
-0.45 C
1955
0.3 C
-0.73 C
1956
-1.1 C
-2.16 C
1957
2.5 C
+1.50 C
1958
2.2 C
+1.16 C
1959
1.3 C
+0.32 C
1960
2.5 C
+1.47 C
1961
0.4 C
-0.60 C
1962
1.3 C
+0.32 C
1963
2.1 C
+1.10 C
1964
0.1 C
-0.95 C
1967
0.6 C
-0.40 C
1968
0.7 C
-0.30 C
1969
1.3 C
+0.25 C
1971
-0.9 C
-1.96 C
1972
-0.5 C
-1.47 C
1974
1.1 C
+0.08 C
1975
-0.7 C
-1.69 C
1976
1.1 C
+0.08 C
1978
1.8 C
+0.83 C
1980
0.5 C
-0.56 C
1981
2.3 C
+1.27 C
1982
-0.4 C
-1.39 C
1984
1.3 C
+0.25 C
1985
0.3 C
-0.68 C
1986
1.3 C
+0.24 C
1987
2.4 C
+1.42 C
1988
2.1 C
+1.08 C
1990
0.4 C
-0.63 C
1992
0.8 C
-0.24 C
1993
2.8 C
+1.81 C
1994
1.0 C
-0.01 C
1995
1.6 C
+0.55 C
1996
-0.4 C
-1.46 C
The fitted trend in annual mean temperature here over 1932 to 1996 is 0.02 C (-0.17 to 0.21) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.03 F (-0.30 to 0.37) per decade. The slope is a straight line fitted to 45 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Kasilof 3 NW
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.02 C (-0.17 to 0.21) per decade
0.03 F (-0.30 to 0.37) per decade
1932 to 1996
45
Not clearly different from zero
Mean daily maximum
-0.04 C (-0.19 to 0.11) per decade
-0.1 F (-0.4 to 0.2) per decade
1932 to 1996
45
Not clearly different from zero
Mean daily minimum
0.1 C (-0.2 to 0.3) per decade
0.1 F (-0.3 to 0.6) per decade
1932 to 1996
45
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
1925 to 1997
Yearly extremes at Kasilof 3 NW: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
30.6 C (87.1 F)
1953
23.3 C (73.9 F)
67
Coldest night (TNn)
-42.8 C (-45.0 F)
1975
-32.2 C (-26.0 F)
67
Wettest day (Rx1day)
81.3 mm (3.2 in)
1987
25.9 mm (1.0 in)
67
Wettest five days (Rx5day)
115.5 mm (4.5 in)
1984
43.2 mm (1.7 in)
67
Longest dry spell (CDD)
117 days
1934
32 days
67
Hottest day (TXx)
The hottest day of the year at Kasilof 3 NW, 1925 to 1997. The record is 30.6 C (87.1 F) in 1953, marked on the chart; the median year is 23.3 C (73.9 F).
Hottest day (TXx) at Kasilof 3 NW by year
Year
Hottest day (TXx)
1925
8.9 C (48.0 F)
1926
29.4 C (84.9 F)
1929
20.0 C (68.0 F)
1930
25.0 C (77.0 F)
1931
25.6 C (78.1 F)
1932
26.1 C (79.0 F)
1933
23.3 C (73.9 F)
1934
22.2 C (72.0 F)
1935
2.8 C (37.0 F)
1936
26.7 C (80.1 F)
1938
20.6 C (69.1 F)
1939
17.8 C (64.0 F)
1940
22.2 C (72.0 F)
1941
23.9 C (75.0 F)
1942
22.8 C (73.0 F)
1943
24.4 C (75.9 F)
1944
23.9 C (75.0 F)
1945
23.3 C (73.9 F)
1946
23.3 C (73.9 F)
1947
25.0 C (77.0 F)
1948
21.7 C (71.1 F)
1951
24.4 C (75.9 F)
1952
25.0 C (77.0 F)
1953
30.6 C (87.1 F)
1954
22.8 C (73.0 F)
1955
26.1 C (79.0 F)
1956
25.0 C (77.0 F)
1957
25.6 C (78.1 F)
1958
23.3 C (73.9 F)
1959
25.6 C (78.1 F)
1960
26.7 C (80.1 F)
1961
23.9 C (75.0 F)
1962
25.0 C (77.0 F)
1963
23.3 C (73.9 F)
1964
25.0 C (77.0 F)
1966
23.3 C (73.9 F)
1967
27.2 C (81.0 F)
1968
27.8 C (82.0 F)
1969
30.6 C (87.1 F)
1970
23.3 C (73.9 F)
1971
23.9 C (75.0 F)
1972
28.3 C (82.9 F)
1973
22.8 C (73.0 F)
1974
26.7 C (80.1 F)
1975
26.7 C (80.1 F)
1976
25.6 C (78.1 F)
1977
28.3 C (82.9 F)
1978
21.1 C (70.0 F)
1979
20.6 C (69.1 F)
1980
19.4 C (66.9 F)
1981
20.0 C (68.0 F)
1982
18.3 C (64.9 F)
1983
20.6 C (69.1 F)
1984
21.7 C (71.1 F)
1985
20.6 C (69.1 F)
1986
23.9 C (75.0 F)
1987
22.2 C (72.0 F)
1988
21.7 C (71.1 F)
1989
23.3 C (73.9 F)
1990
25.6 C (78.1 F)
1991
22.2 C (72.0 F)
1992
22.2 C (72.0 F)
1993
22.2 C (72.0 F)
1994
23.3 C (73.9 F)
1995
19.4 C (66.9 F)
1996
20.6 C (69.1 F)
1997
14.4 C (57.9 F)
Coldest night (TNn)
The coldest night of the year at Kasilof 3 NW, 1925 to 1997. The record is -42.8 C (-45.0 F) in 1975, marked on the chart; the median year is -32.2 C (-26.0 F).
Coldest night (TNn) at Kasilof 3 NW by year
Year
Coldest night (TNn)
1925
-31.1 C (-24.0 F)
1926
-25.6 C (-14.1 F)
1929
-23.9 C (-11.0 F)
1930
-31.1 C (-24.0 F)
1931
-30.6 C (-23.1 F)
1932
-38.3 C (-36.9 F)
1933
-38.9 C (-38.0 F)
1934
-35.6 C (-32.1 F)
1935
-33.3 C (-27.9 F)
1936
-36.1 C (-33.0 F)
1938
-25.6 C (-14.1 F)
1939
-33.9 C (-29.0 F)
1940
-26.1 C (-15.0 F)
1941
-28.3 C (-18.9 F)
1942
-30.6 C (-23.1 F)
1943
-36.7 C (-34.1 F)
1944
-30.6 C (-23.1 F)
1945
-30.6 C (-23.1 F)
1946
-35.6 C (-32.1 F)
1947
-41.7 C (-43.1 F)
1948
-28.9 C (-20.0 F)
1951
-39.4 C (-38.9 F)
1952
-39.4 C (-38.9 F)
1953
-30.6 C (-23.1 F)
1954
-36.1 C (-33.0 F)
1955
-33.3 C (-27.9 F)
1956
-39.4 C (-38.9 F)
1957
-32.2 C (-26.0 F)
1958
-27.8 C (-18.0 F)
1959
-31.1 C (-24.0 F)
1960
-31.1 C (-24.0 F)
1961
-38.3 C (-36.9 F)
1962
-37.2 C (-35.0 F)
1963
-32.8 C (-27.0 F)
1964
-37.2 C (-35.0 F)
1966
-32.2 C (-26.0 F)
1967
-33.3 C (-27.9 F)
1968
-36.7 C (-34.1 F)
1969
-35.6 C (-32.1 F)
1970
-37.8 C (-36.0 F)
1971
-42.2 C (-44.0 F)
1972
-41.1 C (-42.0 F)
1973
-28.9 C (-20.0 F)
1974
-34.4 C (-29.9 F)
1975
-42.8 C (-45.0 F)
1976
-33.3 C (-27.9 F)
1977
-29.4 C (-20.9 F)
1978
-26.7 C (-16.1 F)
1979
-38.3 C (-36.9 F)
1980
-37.2 C (-35.0 F)
1981
-28.9 C (-20.0 F)
1982
-32.8 C (-27.0 F)
1983
-31.1 C (-24.0 F)
1984
-30.0 C (-22.0 F)
1985
-27.2 C (-17.0 F)
1986
-25.0 C (-13.0 F)
1987
-27.8 C (-18.0 F)
1988
-25.6 C (-14.1 F)
1989
-37.2 C (-35.0 F)
1990
-32.2 C (-26.0 F)
1991
-29.4 C (-20.9 F)
1992
-36.1 C (-33.0 F)
1993
-33.3 C (-27.9 F)
1994
-29.4 C (-20.9 F)
1995
-28.9 C (-20.0 F)
1996
-30.0 C (-22.0 F)
1997
-32.2 C (-26.0 F)
Wettest day (Rx1day)
The wettest day of the year at Kasilof 3 NW, 1925 to 1997. The record is 81.3 mm (3.2 in) in 1987, marked on the chart; the median year is 25.9 mm (1.0 in).
Wettest day (Rx1day) at Kasilof 3 NW by year
Year
Wettest day (Rx1day)
1925
22.9 mm (0.9 in)
1926
44.5 mm (1.8 in)
1929
31.8 mm (1.3 in)
1930
25.4 mm (1.0 in)
1931
21.6 mm (0.9 in)
1932
26.4 mm (1.0 in)
1933
25.9 mm (1.0 in)
1934
25.9 mm (1.0 in)
1935
10.2 mm (0.4 in)
1936
17.8 mm (0.7 in)
1938
15.2 mm (0.6 in)
1939
25.1 mm (1.0 in)
1940
43.7 mm (1.7 in)
1941
19.3 mm (0.8 in)
1942
63.8 mm (2.5 in)
1943
23.4 mm (0.9 in)
1944
20.6 mm (0.8 in)
1945
38.9 mm (1.5 in)
1946
20.8 mm (0.8 in)
1947
52.1 mm (2.1 in)
1948
20.6 mm (0.8 in)
1951
47.0 mm (1.9 in)
1952
24.4 mm (1.0 in)
1953
16.5 mm (0.6 in)
1954
30.0 mm (1.2 in)
1955
26.4 mm (1.0 in)
1956
20.3 mm (0.8 in)
1957
25.4 mm (1.0 in)
1958
22.1 mm (0.9 in)
1959
28.7 mm (1.1 in)
1960
21.3 mm (0.8 in)
1961
21.1 mm (0.8 in)
1962
26.4 mm (1.0 in)
1963
24.9 mm (1.0 in)
1964
21.6 mm (0.9 in)
1966
53.3 mm (2.1 in)
1967
20.3 mm (0.8 in)
1968
22.9 mm (0.9 in)
1969
15.2 mm (0.6 in)
1970
21.6 mm (0.9 in)
1971
22.9 mm (0.9 in)
1972
35.6 mm (1.4 in)
1973
31.5 mm (1.2 in)
1974
29.0 mm (1.1 in)
1975
34.5 mm (1.4 in)
1976
30.5 mm (1.2 in)
1977
19.1 mm (0.8 in)
1978
38.4 mm (1.5 in)
1979
39.9 mm (1.6 in)
1980
21.6 mm (0.9 in)
1981
30.5 mm (1.2 in)
1982
32.8 mm (1.3 in)
1983
20.1 mm (0.8 in)
1984
50.8 mm (2.0 in)
1985
29.2 mm (1.1 in)
1986
53.3 mm (2.1 in)
1987
81.3 mm (3.2 in)
1988
26.7 mm (1.1 in)
1989
38.1 mm (1.5 in)
1990
50.8 mm (2.0 in)
1991
20.8 mm (0.8 in)
1992
21.6 mm (0.9 in)
1993
24.4 mm (1.0 in)
1994
27.9 mm (1.1 in)
1995
35.6 mm (1.4 in)
1996
34.3 mm (1.4 in)
1997
19.1 mm (0.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Kasilof 3 NW, 1925 to 1997. The record is 115.5 mm (4.5 in) in 1984, marked on the chart; the median year is 43.2 mm (1.7 in).
Wettest five days (Rx5day) at Kasilof 3 NW by year
Year
Wettest five days (Rx5day)
1925
40.7 mm (1.6 in)
1926
30.9 mm (1.2 in)
1929
1.3 mm (0.05 in)
1930
35.6 mm (1.4 in)
1931
49.1 mm (1.9 in)
1932
34.3 mm (1.4 in)
1933
28.2 mm (1.1 in)
1934
39.9 mm (1.6 in)
1935
17.8 mm (0.7 in)
1936
25.4 mm (1.0 in)
1938
29.6 mm (1.2 in)
1939
38.1 mm (1.5 in)
1940
64.5 mm (2.5 in)
1941
56.4 mm (2.2 in)
1942
82.9 mm (3.3 in)
1943
40.7 mm (1.6 in)
1944
64.8 mm (2.6 in)
1945
67.4 mm (2.7 in)
1946
34.5 mm (1.4 in)
1947
92.8 mm (3.7 in)
1948
30.7 mm (1.2 in)
1951
74.4 mm (2.9 in)
1952
39.8 mm (1.6 in)
1953
31.3 mm (1.2 in)
1954
50.5 mm (2.0 in)
1955
52.5 mm (2.1 in)
1956
44.7 mm (1.8 in)
1957
36.3 mm (1.4 in)
1958
49.8 mm (2.0 in)
1959
61.0 mm (2.4 in)
1960
56.2 mm (2.2 in)
1961
48.5 mm (1.9 in)
1962
40.4 mm (1.6 in)
1963
42.9 mm (1.7 in)
1964
40.6 mm (1.6 in)
1966
99.0 mm (3.9 in)
1967
45.7 mm (1.8 in)
1968
35.6 mm (1.4 in)
1969
20.8 mm (0.8 in)
1970
36.9 mm (1.5 in)
1971
40.5 mm (1.6 in)
1972
43.2 mm (1.7 in)
1973
90.9 mm (3.6 in)
1974
55.2 mm (2.2 in)
1975
67.8 mm (2.7 in)
1976
54.3 mm (2.1 in)
1977
26.0 mm (1.0 in)
1978
42.5 mm (1.7 in)
1979
98.1 mm (3.9 in)
1980
51.1 mm (2.0 in)
1981
51.4 mm (2.0 in)
1982
70.2 mm (2.8 in)
1983
26.0 mm (1.0 in)
1984
115.5 mm (4.5 in)
1985
36.9 mm (1.5 in)
1986
110.0 mm (4.3 in)
1987
83.6 mm (3.3 in)
1988
33.4 mm (1.3 in)
1989
65.5 mm (2.6 in)
1990
71.1 mm (2.8 in)
1991
43.7 mm (1.7 in)
1992
40.2 mm (1.6 in)
1993
42.8 mm (1.7 in)
1994
42.3 mm (1.7 in)
1995
50.8 mm (2.0 in)
1996
59.7 mm (2.4 in)
1997
24.2 mm (1.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Kasilof 3 NW, 1925 to 1997. The record is 117 days in 1934, marked on the chart; the median year is 32 days.
Longest dry spell (CDD) at Kasilof 3 NW by year
Year
Longest dry spell (CDD)
1925
17 days
1926
1 day
1929
22 days
1930
33 days
1931
49 days
1932
89 days
1933
57 days
1934
117 days
1935
30 days
1936
33 days
1938
18 days
1939
16 days
1940
37 days
1941
27 days
1942
51 days
1943
30 days
1944
15 days
1945
20 days
1946
32 days
1947
32 days
1948
50 days
1951
33 days
1952
18 days
1953
25 days
1954
36 days
1955
21 days
1956
27 days
1957
26 days
1958
32 days
1959
27 days
1960
26 days
1961
35 days
1962
38 days
1963
32 days
1964
17 days
1966
18 days
1967
31 days
1968
26 days
1969
40 days
1970
28 days
1971
34 days
1972
44 days
1973
59 days
1974
50 days
1975
32 days
1976
45 days
1977
30 days
1978
22 days
1979
42 days
1980
43 days
1981
22 days
1982
30 days
1983
31 days
1984
32 days
1985
27 days
1986
37 days
1987
39 days
1988
19 days
1989
25 days
1990
28 days
1991
41 days
1992
32 days
1993
36 days
1994
30 days
1995
44 days
1996
26 days
1997
32 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
45 years with a frost
Across 45 years with a frost, the median last spring frost at Kasilof 3 NW falls on 4 June and the median first autumn frost on 1 September, which leaves a median of 90 days between them.
Fitted over all years, the growing season changes by -2.7 days per decade at this station.
Frost dates and growing season at Kasilof 3 NW
Measure
Median, all years
Earliest period
Recent period (1958 to 1996)
Recent against earliest
Fitted trend
Last spring frost
4 June
n/a
7 June
n/a
+1.4 days per decade
First autumn frost
1 September
n/a
31 August
n/a
-1.3 days per decade
Growing days
90 days
n/a
87 days
n/a
-2.7 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
45 years, 1931 to 1996
A day with at least 25.9 mm (1.0 in) of rain is expected about once in 2 years. A day with at least 89.6 mm (3.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Kasilof 3 NW: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
25.9 mm (1.0 in)
5 years
35.3 mm (1.4 in)
10 years
43.8 mm (1.7 in)
25 years
58.1 mm (2.3 in)
50 years
72.0 mm (2.8 in)
Longer than the 45 years of record
100 years
89.6 mm (3.5 in)
Longer than the 45 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, 45 years of values from 1931 to 1996.
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: 81.3 mm (3.2 in) in 1987; 63.8 mm (2.5 in) in 1942; 53.3 mm (2.1 in) in 1986.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Kasilof 3 NW, at 1967. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1967 ran 0.7 C (1.3 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Kasilof 3 NW, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1967
-0.7
-1.3
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 Kasilof 3 NW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Kasilof 3 NW 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.