Record envelope, standing records and threshold days for Kennecott (USC00504555), Alaska, United States, with 43 years of record.
Key Facts for Kennecott
Kennecott (USC00504555) is a weather station in Alaska, United States at 61.48 latitude and -142.88 longitude, 674 m (2,211 ft) above sea level.
The station reports from 1905 to 1947, 43 years of record.
1,464 records set at Kennecott still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Kennecott tied a daily record high maximum temperature of 21.1 C (70.0 F) on 26 August 1947.
About the Station
Location: Alaska, United States, 61.48 latitude, -142.88 longitude.
Elevation: 674 m (2,211 ft).
Period of record: 1905 to 1947, 43 years.
Eligible elements: tmax, tmin, prcp.
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 Kennecott. 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 Kennecott, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
7.8 C (46.0 F)
-43.9 C (-47.0 F)
n/a
n/a
Feb
13.3 C (55.9 F)
-45.6 C (-50.1 F)
n/a
n/a
Mar
16.7 C (62.1 F)
-36.1 C (-33.0 F)
n/a
n/a
Apr
17.8 C (64.0 F)
-32.2 C (-26.0 F)
n/a
n/a
May
25.0 C (77.0 F)
-12.8 C (9.0 F)
n/a
n/a
Jun
26.7 C (80.1 F)
-3.9 C (25.0 F)
n/a
n/a
Jul
28.9 C (84.0 F)
-1.7 C (28.9 F)
n/a
n/a
Aug
23.9 C (75.0 F)
-2.2 C (28.0 F)
n/a
n/a
Sep
23.9 C (75.0 F)
-11.7 C (10.9 F)
n/a
n/a
Oct
16.1 C (61.0 F)
-27.8 C (-18.0 F)
n/a
n/a
Nov
14.4 C (57.9 F)
-34.4 C (-29.9 F)
n/a
n/a
Dec
10.6 C (51.1 F)
-41.7 C (-43.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Kennecott still stand. 1934 holds the most, with 71.
Standing records at Kennecott by the year they were set
Year set
Standing records
1905
17
1906
53
1909
55
1910
42
1911
2
1912
27
1916
27
1917
60
1918
50
1919
17
1920
46
1921
36
1922
29
1923
29
1924
30
1925
37
1926
46
1927
39
1928
30
1929
31
1930
42
1931
27
1932
43
1933
42
1934
71
1935
51
1936
55
1937
24
1938
30
1939
34
1940
36
1941
37
1942
45
1943
34
1944
23
1945
44
1946
63
1947
60
All-Time Record Progression
4 new records
4 all-time records were set at Kennecott between 11 July 1946 and 1 February 1947. Each dot is a new record.
When Kennecott set new all-time records
Date
Kind
Detail
1946-07-11
Record high maximum temperature
Record high maximum temperature 28.9 C (84.0 F)
1947-01-30
Record low minimum temperature
Record low minimum temperature -42.2 C (-44.0 F)
1947-01-31
Record low minimum temperature
Record low minimum temperature -43.9 C (-47.0 F)
1947-02-01
Record low minimum temperature
Record low minimum temperature -45.6 C (-50.1 F)
Wettest Day of Each Month
Oct: 65.5 mm (2.6 in)
The wettest day on record for each calendar month at Kennecott. The most was 65.5 mm (2.6 in) on 7 October 1929.
Record daily precipitation for each month at Kennecott
Month
Record daily precipitation (mm)
Date
Jan
41.9 mm (1.6 in)
20 January 1937
Feb
60.7 mm (2.4 in)
13 February 1932
Mar
22.9 mm (0.9 in)
17 March 1917
Apr
25.4 mm (1.0 in)
27 April 1917
May
50.0 mm (2.0 in)
12 May 1944
Jun
50.8 mm (2.0 in)
11 June 1918
Jul
36.8 mm (1.4 in)
5 July 1922
Aug
47.8 mm (1.9 in)
14 August 1927
Sep
50.8 mm (2.0 in)
22 September 1918
Oct
65.5 mm (2.6 in)
7 October 1929
Nov
48.8 mm (1.9 in)
24 November 1928
Dec
54.9 mm (2.2 in)
4 December 1934
Period of Record Coverage
1905 to 1947
Complete yearUnder 90 percent of days
38 years of record at Kennecott, 1905 to 1947. 15 years have data for under 90 percent of days and are left out of rankings: 1905, 1906, 1909, 1910, 1911, 1912, 1916, 1919 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 23 complete years at Kennecott, 1917 to 1946. Blue stripes are years cooler than the station's own mean of -0.9 C (30.3 F); red stripes are warmer. The coolest year was 1933, at -2.6 C (27.2 F), and the warmest was 1926, at 0.7 C (33.3 F). The strongest colour marks a difference of 1.8 C (3.2 F).
Annual mean temperature at Kennecott as warming stripes, 1917 to 1946
Year
Annual mean temperature
Difference from the station mean
1917
-2.6 C
-1.62 C
1918
-1.5 C
-0.52 C
1923
-1.4 C
-0.46 C
1926
0.7 C
+1.64 C
1927
-2.2 C
-1.25 C
1928
0.0 C
+0.96 C
1929
-0.2 C
+0.74 C
1930
-1.8 C
-0.86 C
1931
-0.4 C
+0.52 C
1932
-2.5 C
-1.57 C
1933
-2.6 C
-1.71 C
1934
-0.5 C
+0.42 C
1935
-1.2 C
-0.26 C
1936
-0.2 C
+0.70 C
1937
-1.3 C
-0.35 C
1938
-0.1 C
+0.88 C
1939
-1.5 C
-0.58 C
1940
0.1 C
+1.07 C
1941
-0.8 C
+0.14 C
1942
-1.1 C
-0.13 C
1943
0.2 C
+1.11 C
1944
-0.4 C
+0.50 C
1946
-0.4 C
+0.53 C
This station does not have enough complete years (30 are needed) to fit a temperature trend.
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 1947
Yearly extremes at Kennecott: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
28.9 C (84.0 F)
1946
23.9 C (75.0 F)
38
Coldest night (TNn)
-45.6 C (-50.1 F)
1947
-34.4 C (-29.9 F)
37
Wettest day (Rx1day)
65.5 mm (2.6 in)
1929
35.6 mm (1.4 in)
32
Wettest five days (Rx5day)
116.6 mm (4.6 in)
1934
61.9 mm (2.4 in)
32
Longest dry spell (CDD)
63 days
1923
27 days
32
Hottest day (TXx)
The hottest day of the year at Kennecott, 1905 to 1947. The record is 28.9 C (84.0 F) in 1946, marked on the chart; the median year is 23.9 C (75.0 F).
Hottest day (TXx) at Kennecott by year
Year
Hottest day (TXx)
1905
20.6 C (69.1 F)
1906
23.3 C (73.9 F)
1909
26.1 C (79.0 F)
1910
24.4 C (75.9 F)
1911
18.9 C (66.0 F)
1912
21.1 C (70.0 F)
1916
22.2 C (72.0 F)
1917
23.9 C (75.0 F)
1918
25.6 C (78.1 F)
1919
24.4 C (75.9 F)
1920
24.4 C (75.9 F)
1921
23.3 C (73.9 F)
1922
21.1 C (70.0 F)
1923
26.1 C (79.0 F)
1924
26.1 C (79.0 F)
1925
26.1 C (79.0 F)
1926
25.6 C (78.1 F)
1927
23.3 C (73.9 F)
1928
25.0 C (77.0 F)
1929
21.7 C (71.1 F)
1930
22.8 C (73.0 F)
1931
23.9 C (75.0 F)
1932
22.8 C (73.0 F)
1933
26.1 C (79.0 F)
1934
25.6 C (78.1 F)
1935
23.9 C (75.0 F)
1936
26.7 C (80.1 F)
1937
23.3 C (73.9 F)
1938
22.8 C (73.0 F)
1939
23.9 C (75.0 F)
1940
23.3 C (73.9 F)
1941
23.3 C (73.9 F)
1942
23.9 C (75.0 F)
1943
23.9 C (75.0 F)
1944
24.4 C (75.9 F)
1945
23.3 C (73.9 F)
1946
28.9 C (84.0 F)
1947
25.6 C (78.1 F)
Coldest night (TNn)
The coldest night of the year at Kennecott, 1905 to 1947. The record is -45.6 C (-50.1 F) in 1947, marked on the chart; the median year is -34.4 C (-29.9 F).
Coldest night (TNn) at Kennecott by year
Year
Coldest night (TNn)
1905
n/a
1906
-23.3 C (-9.9 F)
1909
-32.8 C (-27.0 F)
1910
-35.0 C (-31.0 F)
1911
-33.9 C (-29.0 F)
1912
-36.1 C (-33.0 F)
1916
-34.4 C (-29.9 F)
1917
-41.7 C (-43.1 F)
1918
-37.8 C (-36.0 F)
1919
-33.9 C (-29.0 F)
1920
-37.2 C (-35.0 F)
1921
-33.9 C (-29.0 F)
1922
-32.8 C (-27.0 F)
1923
-36.1 C (-33.0 F)
1924
-34.4 C (-29.9 F)
1925
-28.9 C (-20.0 F)
1926
-27.2 C (-17.0 F)
1927
-33.3 C (-27.9 F)
1928
-31.1 C (-24.0 F)
1929
-36.1 C (-33.0 F)
1930
-36.7 C (-34.1 F)
1931
-31.7 C (-25.1 F)
1932
-36.7 C (-34.1 F)
1933
-37.8 C (-36.0 F)
1934
-39.4 C (-38.9 F)
1935
-34.4 C (-29.9 F)
1936
-35.6 C (-32.1 F)
1937
-34.4 C (-29.9 F)
1938
-36.7 C (-34.1 F)
1939
-33.9 C (-29.0 F)
1940
-32.8 C (-27.0 F)
1941
-35.6 C (-32.1 F)
1942
-41.1 C (-42.0 F)
1943
-38.3 C (-36.9 F)
1944
-33.9 C (-29.0 F)
1945
-33.3 C (-27.9 F)
1946
-40.6 C (-41.1 F)
1947
-45.6 C (-50.1 F)
Wettest day (Rx1day)
The wettest day of the year at Kennecott, 1905 to 1947. The record is 65.5 mm (2.6 in) in 1929, marked on the chart; the median year is 35.6 mm (1.4 in).
Wettest day (Rx1day) at Kennecott by year
Year
Wettest day (Rx1day)
1905
n/a
1906
n/a
1909
n/a
1910
n/a
1911
n/a
1912
n/a
1916
10.2 mm (0.4 in)
1917
33.0 mm (1.3 in)
1918
50.8 mm (2.0 in)
1919
15.2 mm (0.6 in)
1920
55.6 mm (2.2 in)
1921
35.6 mm (1.4 in)
1922
36.8 mm (1.4 in)
1923
41.9 mm (1.6 in)
1924
35.6 mm (1.4 in)
1925
32.8 mm (1.3 in)
1926
23.6 mm (0.9 in)
1927
47.8 mm (1.9 in)
1928
48.8 mm (1.9 in)
1929
65.5 mm (2.6 in)
1930
20.6 mm (0.8 in)
1931
27.4 mm (1.1 in)
1932
60.7 mm (2.4 in)
1933
30.0 mm (1.2 in)
1934
54.9 mm (2.2 in)
1935
35.6 mm (1.4 in)
1936
44.2 mm (1.7 in)
1937
41.9 mm (1.6 in)
1938
35.3 mm (1.4 in)
1939
33.5 mm (1.3 in)
1940
31.5 mm (1.2 in)
1941
33.8 mm (1.3 in)
1942
44.5 mm (1.8 in)
1943
31.8 mm (1.3 in)
1944
50.0 mm (2.0 in)
1945
28.7 mm (1.1 in)
1946
35.6 mm (1.4 in)
1947
22.4 mm (0.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Kennecott, 1905 to 1947. The record is 116.6 mm (4.6 in) in 1934, marked on the chart; the median year is 61.9 mm (2.4 in).
Wettest five days (Rx5day) at Kennecott by year
Year
Wettest five days (Rx5day)
1905
n/a
1906
n/a
1909
n/a
1910
n/a
1911
n/a
1912
n/a
1916
22.1 mm (0.9 in)
1917
40.7 mm (1.6 in)
1918
88.9 mm (3.5 in)
1919
29.7 mm (1.2 in)
1920
48.3 mm (1.9 in)
1921
38.1 mm (1.5 in)
1922
66.0 mm (2.6 in)
1923
62.3 mm (2.5 in)
1924
57.2 mm (2.3 in)
1925
69.1 mm (2.7 in)
1926
53.3 mm (2.1 in)
1927
89.2 mm (3.5 in)
1928
68.3 mm (2.7 in)
1929
75.6 mm (3.0 in)
1930
42.6 mm (1.7 in)
1931
57.9 mm (2.3 in)
1932
99.6 mm (3.9 in)
1933
61.5 mm (2.4 in)
1934
116.6 mm (4.6 in)
1935
60.0 mm (2.4 in)
1936
85.9 mm (3.4 in)
1937
67.8 mm (2.7 in)
1938
104.1 mm (4.1 in)
1939
87.9 mm (3.5 in)
1940
47.5 mm (1.9 in)
1941
67.8 mm (2.7 in)
1942
88.3 mm (3.5 in)
1943
59.8 mm (2.4 in)
1944
82.0 mm (3.2 in)
1945
53.6 mm (2.1 in)
1946
53.9 mm (2.1 in)
1947
52.6 mm (2.1 in)
Longest dry spell (CDD)
The longest dry spell of the year at Kennecott, 1905 to 1947. The record is 63 days in 1923, marked on the chart; the median year is 27 days.
Longest dry spell (CDD) at Kennecott by year
Year
Longest dry spell (CDD)
1905
n/a
1906
n/a
1909
n/a
1910
n/a
1911
n/a
1912
n/a
1916
13 days
1917
27 days
1918
24 days
1919
51 days
1920
26 days
1921
23 days
1922
20 days
1923
63 days
1924
20 days
1925
17 days
1926
45 days
1927
24 days
1928
30 days
1929
39 days
1930
24 days
1931
25 days
1932
46 days
1933
20 days
1934
39 days
1935
18 days
1936
29 days
1937
55 days
1938
46 days
1939
44 days
1940
37 days
1941
29 days
1942
27 days
1943
23 days
1944
24 days
1945
27 days
1946
28 days
1947
31 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
23 years with a frost
Across 23 years with a frost, the median last spring frost at Kennecott falls on 4 June and the median first autumn frost on 3 September, which leaves a median of 91 days between them.
Frost dates and growing season at Kennecott
Measure
Median, all years
Earliest period
Recent period (1917 to 1946)
Recent against earliest
Fitted trend
Last spring frost
4 June
n/a
4 June
n/a
n/a
First autumn frost
3 September
n/a
3 September
n/a
n/a
Growing days
91 days
n/a
91 days
n/a
n/a
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.
Download the Data
Data for Kennecott standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Kennecott 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.