Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Isachsen. 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 Isachsen, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
-1.5 C (29.3 F)
-52.8 C (-63.0 F)
n/a
n/a
Feb
-4.4 C (24.1 F)
-53.3 C (-63.9 F)
n/a
n/a
Mar
-8.3 C (17.1 F)
-53.9 C (-65.0 F)
n/a
n/a
Apr
-1.1 C (30.0 F)
-45.6 C (-50.1 F)
n/a
n/a
May
6.1 C (43.0 F)
-29.4 C (-20.9 F)
n/a
n/a
Jun
16.7 C (62.1 F)
-15.6 C (3.9 F)
n/a
n/a
Jul
22.2 C (72.0 F)
-7.2 C (19.0 F)
n/a
n/a
Aug
14.4 C (57.9 F)
-13.3 C (8.1 F)
n/a
n/a
Sep
3.9 C (39.0 F)
-29.4 C (-20.9 F)
n/a
n/a
Oct
0.0 C (32.0 F)
-41.1 C (-42.0 F)
n/a
n/a
Nov
-3.9 C (25.0 F)
-47.2 C (-53.0 F)
n/a
n/a
Dec
-3.3 C (26.1 F)
-52.2 C (-62.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Isachsen still stand. 1952 holds the most, with 75.
Standing records at Isachsen by the year they were set
Year set
Standing records
1948
36
1949
40
1950
54
1951
40
1952
75
1953
53
1954
42
1955
47
1956
70
1957
55
1958
73
1959
29
1960
41
1961
31
1962
57
1963
69
1964
73
1965
49
1966
38
1967
47
1968
23
1969
35
1970
34
1971
47
1972
28
1973
46
1974
59
1975
47
1976
44
1977
53
1978
29
Wettest Day of Each Month
Aug: 20.3 mm (0.8 in)
The wettest day on record for each calendar month at Isachsen. The most was 20.3 mm (0.8 in) on 13 August 1951.
Record daily precipitation for each month at Isachsen
Month
Record daily precipitation (mm)
Date
Jan
6.9 mm (0.27 in)
5 January 1973
Feb
5.6 mm (0.22 in)
4 February 1963
Mar
4.8 mm (0.19 in)
16 March 1967
Apr
9.9 mm (0.39 in)
17 April 1977
May
6.6 mm (0.26 in)
6 May 1977
Jun
18.8 mm (0.7 in)
7 June 1962
Jul
17.8 mm (0.7 in)
8 July 1973
Aug
20.3 mm (0.8 in)
13 August 1951
Sep
19.8 mm (0.8 in)
16 September 1959
Oct
10.9 mm (0.4 in)
31 October 1961
Nov
6.4 mm (0.25 in)
1 November 1956
Dec
5.3 mm (0.21 in)
27 December 1962
Period of Record Coverage
1948 to 1978
Complete yearUnder 90 percent of days
31 years of record at Isachsen, 1948 to 1978. 3 years have data for under 90 percent of days and are left out of rankings: 1948, 1949, 1978.
Cooler than the station meanWarmer than the station mean
One stripe for each of 28 complete years at Isachsen, 1950 to 1977. Blue stripes are years cooler than the station's own mean of -19.2 C (-2.5 F); red stripes are warmer. The coolest year was 1972, at -21.1 C (-6.0 F), and the warmest was 1962, at -17.7 C (0.2 F). The strongest colour marks a difference of 2.0 C (3.6 F).
Annual mean temperature at Isachsen as warming stripes, 1950 to 1977
Year
Annual mean temperature
Difference from the station mean
1950
-19.8 C
-0.65 C
1951
-18.7 C
+0.49 C
1952
-17.9 C
+1.26 C
1953
-18.6 C
+0.57 C
1954
-18.6 C
+0.60 C
1955
-19.1 C
+0.08 C
1956
-20.1 C
-0.89 C
1957
-19.2 C
+0.00 C
1958
-17.9 C
+1.27 C
1959
-18.9 C
+0.24 C
1960
-18.3 C
+0.90 C
1961
-19.6 C
-0.47 C
1962
-17.7 C
+1.51 C
1963
-18.7 C
+0.48 C
1964
-20.5 C
-1.30 C
1965
-18.8 C
+0.37 C
1966
-19.6 C
-0.40 C
1967
-19.4 C
-0.26 C
1968
-19.5 C
-0.36 C
1969
-18.8 C
+0.34 C
1970
-19.3 C
-0.15 C
1971
-18.6 C
+0.59 C
1972
-21.1 C
-1.93 C
1973
-18.9 C
+0.29 C
1974
-21.0 C
-1.80 C
1975
-19.8 C
-0.60 C
1976
-19.2 C
-0.03 C
1977
-19.4 C
-0.21 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
1948 to 1978
Yearly extremes at Isachsen: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
22.2 C (72.0 F)
1962
12.8 C (55.0 F)
31
Coldest night (TNn)
-53.9 C (-65.0 F)
1956
-50.0 C (-58.0 F)
31
Wettest day (Rx1day)
20.3 mm (0.8 in)
1951
8.6 mm (0.34 in)
31
Wettest five days (Rx5day)
38.1 mm (1.5 in)
1951
15.6 mm (0.6 in)
31
Longest dry spell (CDD)
154 days
1950
70 days
31
Hottest day (TXx)
The hottest day of the year at Isachsen, 1948 to 1978. The record is 22.2 C (72.0 F) in 1962, marked on the chart; the median year is 12.8 C (55.0 F).
Hottest day (TXx) at Isachsen by year
Year
Hottest day (TXx)
1948
17.8 C (64.0 F)
1949
14.4 C (57.9 F)
1950
14.4 C (57.9 F)
1951
13.9 C (57.0 F)
1952
13.3 C (55.9 F)
1953
10.0 C (50.0 F)
1954
12.2 C (54.0 F)
1955
8.3 C (46.9 F)
1956
12.8 C (55.0 F)
1957
18.9 C (66.0 F)
1958
15.6 C (60.1 F)
1959
15.6 C (60.1 F)
1960
12.8 C (55.0 F)
1961
12.8 C (55.0 F)
1962
22.2 C (72.0 F)
1963
14.4 C (57.9 F)
1964
10.6 C (51.1 F)
1965
11.7 C (53.1 F)
1966
15.0 C (59.0 F)
1967
11.1 C (52.0 F)
1968
13.3 C (55.9 F)
1969
9.4 C (48.9 F)
1970
11.7 C (53.1 F)
1971
13.3 C (55.9 F)
1972
8.3 C (46.9 F)
1973
10.6 C (51.1 F)
1974
11.7 C (53.1 F)
1975
12.8 C (55.0 F)
1976
15.0 C (59.0 F)
1977
14.5 C (58.1 F)
1978
2.2 C (36.0 F)
Coldest night (TNn)
The coldest night of the year at Isachsen, 1948 to 1978. The record is -53.9 C (-65.0 F) in 1956, marked on the chart; the median year is -50.0 C (-58.0 F).
Coldest night (TNn) at Isachsen by year
Year
Coldest night (TNn)
1948
-46.1 C (-51.0 F)
1949
-48.3 C (-54.9 F)
1950
-51.2 C (-60.2 F)
1951
-52.8 C (-63.0 F)
1952
-47.8 C (-54.0 F)
1953
-50.0 C (-58.0 F)
1954
-48.3 C (-54.9 F)
1955
-51.2 C (-60.2 F)
1956
-53.9 C (-65.0 F)
1957
-48.9 C (-56.0 F)
1958
-50.6 C (-59.1 F)
1959
-50.6 C (-59.1 F)
1960
-49.4 C (-56.9 F)
1961
-48.3 C (-54.9 F)
1962
-45.6 C (-50.1 F)
1963
-51.2 C (-60.2 F)
1964
-53.3 C (-63.9 F)
1965
-47.8 C (-54.0 F)
1966
-48.3 C (-54.9 F)
1967
-48.9 C (-56.0 F)
1968
-50.6 C (-59.1 F)
1969
-48.3 C (-54.9 F)
1970
-47.2 C (-53.0 F)
1971
-51.7 C (-61.1 F)
1972
-50.0 C (-58.0 F)
1973
-50.6 C (-59.1 F)
1974
-52.2 C (-62.0 F)
1975
-50.0 C (-58.0 F)
1976
-52.2 C (-62.0 F)
1977
-47.0 C (-52.6 F)
1978
-47.4 C (-53.3 F)
Wettest day (Rx1day)
The wettest day of the year at Isachsen, 1948 to 1978. The record is 20.3 mm (0.8 in) in 1951, marked on the chart; the median year is 8.6 mm (0.34 in).
Wettest day (Rx1day) at Isachsen by year
Year
Wettest day (Rx1day)
1948
7.6 mm (0.30 in)
1949
7.6 mm (0.30 in)
1950
8.6 mm (0.34 in)
1951
20.3 mm (0.8 in)
1952
10.9 mm (0.4 in)
1953
15.2 mm (0.6 in)
1954
13.2 mm (0.5 in)
1955
10.7 mm (0.4 in)
1956
7.1 mm (0.28 in)
1957
10.7 mm (0.4 in)
1958
14.2 mm (0.6 in)
1959
19.8 mm (0.8 in)
1960
7.6 mm (0.30 in)
1961
10.9 mm (0.4 in)
1962
18.8 mm (0.7 in)
1963
9.9 mm (0.39 in)
1964
5.3 mm (0.21 in)
1965
6.6 mm (0.26 in)
1966
6.1 mm (0.24 in)
1967
10.4 mm (0.4 in)
1968
7.1 mm (0.28 in)
1969
7.9 mm (0.31 in)
1970
7.6 mm (0.30 in)
1971
6.6 mm (0.26 in)
1972
8.4 mm (0.33 in)
1973
17.8 mm (0.7 in)
1974
6.4 mm (0.25 in)
1975
9.7 mm (0.38 in)
1976
7.9 mm (0.31 in)
1977
9.9 mm (0.39 in)
1978
7.3 mm (0.29 in)
Wettest five days (Rx5day)
The wettest five days of the year at Isachsen, 1948 to 1978. The record is 38.1 mm (1.5 in) in 1951, marked on the chart; the median year is 15.6 mm (0.6 in).
Wettest five days (Rx5day) at Isachsen by year
Year
Wettest five days (Rx5day)
1948
11.7 mm (0.5 in)
1949
16.2 mm (0.6 in)
1950
14.0 mm (0.6 in)
1951
38.1 mm (1.5 in)
1952
11.7 mm (0.5 in)
1953
22.6 mm (0.9 in)
1954
24.1 mm (0.9 in)
1955
12.8 mm (0.5 in)
1956
14.8 mm (0.6 in)
1957
17.1 mm (0.7 in)
1958
15.6 mm (0.6 in)
1959
28.7 mm (1.1 in)
1960
16.3 mm (0.6 in)
1961
13.9 mm (0.5 in)
1962
29.4 mm (1.2 in)
1963
13.9 mm (0.5 in)
1964
8.9 mm (0.35 in)
1965
10.5 mm (0.4 in)
1966
11.2 mm (0.4 in)
1967
21.2 mm (0.8 in)
1968
13.7 mm (0.5 in)
1969
21.2 mm (0.8 in)
1970
14.6 mm (0.6 in)
1971
15.7 mm (0.6 in)
1972
12.7 mm (0.5 in)
1973
21.4 mm (0.8 in)
1974
11.4 mm (0.4 in)
1975
22.7 mm (0.9 in)
1976
20.0 mm (0.8 in)
1977
17.9 mm (0.7 in)
1978
14.7 mm (0.6 in)
Longest dry spell (CDD)
The longest dry spell of the year at Isachsen, 1948 to 1978. The record is 154 days in 1950, marked on the chart; the median year is 70 days.
Longest dry spell (CDD) at Isachsen by year
Year
Longest dry spell (CDD)
1948
46 days
1949
92 days
1950
154 days
1951
119 days
1952
108 days
1953
97 days
1954
82 days
1955
107 days
1956
74 days
1957
70 days
1958
74 days
1959
81 days
1960
67 days
1961
66 days
1962
68 days
1963
50 days
1964
76 days
1965
64 days
1966
117 days
1967
55 days
1968
135 days
1969
46 days
1970
45 days
1971
79 days
1972
52 days
1973
50 days
1974
97 days
1975
54 days
1976
31 days
1977
58 days
1978
51 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
28 years with a frost
Across 28 years with a frost, the median last spring frost at Isachsen falls on 30 June and the median first autumn frost on 1 July, which leaves a median of 1 day between them.
Fitted over all years, the growing season changes by -1.5 days per decade at this station.
Frost dates and growing season at Isachsen
Measure
Median, all years
Earliest period
Recent period (1950 to 1977)
Recent against earliest
Fitted trend
Last spring frost
30 June
n/a
30 June
n/a
+0.6 days per decade
First autumn frost
1 July
n/a
1 July
n/a
-0.9 days per decade
Growing days
1 day
n/a
1 day
n/a
-1.5 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.
Download the Data
Data for Isachsen standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Isachsen 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.