Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Ilomantsi Kk. 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 Ilomantsi Kk, 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)
-39.8 C (-39.6 F)
n/a
n/a
Feb
6.7 C (44.1 F)
-38.8 C (-37.8 F)
n/a
n/a
Mar
12.3 C (54.1 F)
-32.5 C (-26.5 F)
n/a
n/a
Apr
22.1 C (71.8 F)
-23.6 C (-10.5 F)
n/a
n/a
May
28.5 C (83.3 F)
-11.0 C (12.2 F)
n/a
n/a
Jun
31.7 C (89.1 F)
-1.5 C (29.3 F)
n/a
n/a
Jul
32.0 C (89.6 F)
2.1 C (35.8 F)
n/a
n/a
Aug
30.0 C (86.0 F)
-2.8 C (27.0 F)
n/a
n/a
Sep
26.5 C (79.7 F)
-8.2 C (17.2 F)
n/a
n/a
Oct
17.0 C (62.6 F)
-18.1 C (-0.6 F)
n/a
n/a
Nov
9.5 C (49.1 F)
-28.2 C (-18.8 F)
n/a
n/a
Dec
6.0 C (42.8 F)
-37.0 C (-34.6 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Ilomantsi Kk still stand. 1966 holds the most, with 64.
Standing records at Ilomantsi Kk by the year they were set
Year set
Standing records
1959
27
1960
23
1961
28
1962
23
1963
38
1964
6
1965
16
1966
64
1967
41
1968
45
1969
33
1970
25
1971
40
1972
54
1973
39
1974
25
1975
34
1976
39
1977
38
1978
48
1979
46
1980
24
1981
28
1982
39
1983
29
1984
21
1985
37
1986
28
1987
40
1988
38
1989
44
1990
56
1991
23
1992
41
1993
28
1994
27
1995
43
1996
40
1997
31
1998
38
1999
56
2000
21
All-Time Record Progression
1 new records
1 all-time records were set at Ilomantsi Kk between 29 June 1991 and 29 June 1991. Each dot is a new record.
When Ilomantsi Kk set new all-time records
Date
Kind
Detail
1991-06-29
Record daily precipitation
Record daily precipitation 45.1 mm (1.8 in)
Wettest Day of Each Month
Jun: 45.1 mm (1.8 in)
The wettest day on record for each calendar month at Ilomantsi Kk. The most was 45.1 mm (1.8 in) on 29 June 1991.
Record daily precipitation for each month at Ilomantsi Kk
Month
Record daily precipitation (mm)
Date
Jan
17.9 mm (0.7 in)
13 January 1983
Feb
24.0 mm (0.9 in)
20 February 1990
Mar
17.9 mm (0.7 in)
18 March 1961
Apr
24.8 mm (1.0 in)
27 April 1970
May
27.2 mm (1.1 in)
29 May 1996
Jun
45.1 mm (1.8 in)
29 June 1991
Jul
44.1 mm (1.7 in)
4 July 1972
Aug
40.9 mm (1.6 in)
19 August 1992
Sep
42.1 mm (1.7 in)
16 September 1994
Oct
27.7 mm (1.1 in)
1 October 1994
Nov
30.5 mm (1.2 in)
21 November 1980
Dec
19.3 mm (0.8 in)
3 December 1981
Period of Record Coverage
1959 to 2000
Complete yearUnder 90 percent of days
42 years of record at Ilomantsi Kk, 1959 to 2000. 4 years have data for under 90 percent of days and are left out of rankings: 1959, 1964, 1965, 2000.
Cooler than the station meanWarmer than the station mean
One stripe for each of 38 complete years at Ilomantsi Kk, 1960 to 1999. Blue stripes are years cooler than the station's own mean of 2.0 C (35.5 F); red stripes are warmer. The coolest year was 1966, at -0.3 C (31.5 F), and the warmest was 1989, at 4.3 C (39.7 F). The strongest colour marks a difference of 2.4 C (4.3 F).
Annual mean temperature at Ilomantsi Kk as warming stripes, 1960 to 1999
Year
Annual mean temperature
Difference from the station mean
1960
2.1 C
+0.16 C
1961
3.7 C
+1.71 C
1962
1.9 C
-0.04 C
1963
1.7 C
-0.26 C
1966
-0.3 C
-2.21 C
1967
2.4 C
+0.43 C
1968
0.7 C
-1.21 C
1969
0.6 C
-1.31 C
1970
1.5 C
-0.47 C
1971
1.1 C
-0.85 C
1972
3.1 C
+1.16 C
1973
1.8 C
-0.17 C
1974
3.5 C
+1.55 C
1975
3.5 C
+1.54 C
1976
0.2 C
-1.75 C
1977
1.8 C
-0.17 C
1978
0.1 C
-1.88 C
1979
1.8 C
-0.15 C
1980
1.1 C
-0.82 C
1981
2.1 C
+0.11 C
1982
2.2 C
+0.25 C
1983
2.5 C
+0.59 C
1984
2.9 C
+0.91 C
1985
0.0 C
-1.97 C
1986
1.5 C
-0.42 C
1987
0.0 C
-1.95 C
1988
2.4 C
+0.48 C
1989
4.3 C
+2.35 C
1990
2.9 C
+0.94 C
1991
2.8 C
+0.89 C
1992
2.8 C
+0.81 C
1993
1.7 C
-0.24 C
1994
2.1 C
+0.15 C
1995
3.1 C
+1.14 C
1996
2.1 C
+0.17 C
1997
2.0 C
+0.08 C
1998
1.6 C
-0.35 C
1999
2.9 C
+0.96 C
The fitted trend in annual mean temperature here over 1960 to 1999 is 0.2 C (-0.1 to 0.5) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.3 F (-0.3 to 0.9) per decade. The slope is a straight line fitted to 38 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Ilomantsi Kk
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.2 C (-0.1 to 0.5) per decade
0.3 F (-0.3 to 0.9) per decade
1960 to 1999
38
Not clearly different from zero
Mean daily maximum
0.2 C (-0.1 to 0.5) per decade
0.4 F (-0.1 to 0.9) per decade
1960 to 1999
38
Not clearly different from zero
Mean daily minimum
0.1 C (-0.2 to 0.5) per decade
0.3 F (-0.4 to 0.9) per decade
1960 to 1999
38
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
1959 to 2000
Yearly extremes at Ilomantsi Kk: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
32.0 C (89.6 F)
1972
28.5 C (83.2 F)
42
Coldest night (TNn)
-39.8 C (-39.6 F)
1987
-31.8 C (-25.2 F)
42
Wettest day (Rx1day)
45.1 mm (1.8 in)
1991
27.2 mm (1.1 in)
42
Wettest five days (Rx5day)
89.1 mm (3.5 in)
1992
51.5 mm (2.0 in)
42
Longest dry spell (CDD)
37 days
1976
19 days
42
Hottest day (TXx)
The hottest day of the year at Ilomantsi Kk, 1959 to 2000. The record is 32.0 C (89.6 F) in 1972, marked on the chart; the median year is 28.5 C (83.2 F).
Hottest day (TXx) at Ilomantsi Kk by year
Year
Hottest day (TXx)
1959
27.4 C (81.3 F)
1960
30.7 C (87.3 F)
1961
28.1 C (82.6 F)
1962
23.2 C (73.8 F)
1963
29.8 C (85.6 F)
1964
28.5 C (83.3 F)
1965
26.5 C (79.7 F)
1966
28.9 C (84.0 F)
1967
29.9 C (85.8 F)
1968
28.0 C (82.4 F)
1969
29.0 C (84.2 F)
1970
31.2 C (88.2 F)
1971
27.2 C (81.0 F)
1972
32.0 C (89.6 F)
1973
28.6 C (83.5 F)
1974
27.6 C (81.7 F)
1975
27.5 C (81.5 F)
1976
25.6 C (78.1 F)
1977
29.5 C (85.1 F)
1978
27.5 C (81.5 F)
1979
25.7 C (78.3 F)
1980
27.8 C (82.0 F)
1981
28.7 C (83.7 F)
1982
27.1 C (80.8 F)
1983
27.7 C (81.9 F)
1984
28.5 C (83.3 F)
1985
30.0 C (86.0 F)
1986
28.4 C (83.1 F)
1987
26.7 C (80.1 F)
1988
31.0 C (87.8 F)
1989
29.5 C (85.1 F)
1990
26.1 C (79.0 F)
1991
29.0 C (84.2 F)
1992
27.8 C (82.0 F)
1993
25.9 C (78.6 F)
1994
29.4 C (84.9 F)
1995
29.7 C (85.5 F)
1996
25.5 C (77.9 F)
1997
29.7 C (85.5 F)
1998
30.0 C (86.0 F)
1999
32.0 C (89.6 F)
2000
23.9 C (75.0 F)
Coldest night (TNn)
The coldest night of the year at Ilomantsi Kk, 1959 to 2000. The record is -39.8 C (-39.6 F) in 1987, marked on the chart; the median year is -31.8 C (-25.2 F).
Coldest night (TNn) at Ilomantsi Kk by year
Year
Coldest night (TNn)
1959
-28.7 C (-19.7 F)
1960
-29.2 C (-20.6 F)
1961
-25.6 C (-14.1 F)
1962
-28.4 C (-19.1 F)
1963
-28.6 C (-19.5 F)
1964
-26.4 C (-15.5 F)
1965
-24.9 C (-12.8 F)
1966
-38.5 C (-37.3 F)
1967
-37.6 C (-35.7 F)
1968
-37.7 C (-35.9 F)
1969
-33.9 C (-29.0 F)
1970
-35.6 C (-32.1 F)
1971
-31.4 C (-24.5 F)
1972
-33.5 C (-28.3 F)
1973
-28.1 C (-18.6 F)
1974
-28.1 C (-18.6 F)
1975
-28.6 C (-19.5 F)
1976
-35.4 C (-31.7 F)
1977
-33.5 C (-28.3 F)
1978
-37.0 C (-34.6 F)
1979
-35.5 C (-31.9 F)
1980
-38.8 C (-37.8 F)
1981
-30.4 C (-22.7 F)
1982
-37.4 C (-35.3 F)
1983
-27.2 C (-17.0 F)
1984
-24.8 C (-12.6 F)
1985
-36.9 C (-34.4 F)
1986
-35.0 C (-31.0 F)
1987
-39.8 C (-39.6 F)
1988
-32.2 C (-26.0 F)
1989
-26.3 C (-15.3 F)
1990
-30.8 C (-23.4 F)
1991
-33.8 C (-28.8 F)
1992
-28.2 C (-18.8 F)
1993
-29.3 C (-20.7 F)
1994
-35.7 C (-32.3 F)
1995
-34.6 C (-30.3 F)
1996
-31.2 C (-24.2 F)
1997
-30.2 C (-22.4 F)
1998
-35.0 C (-31.0 F)
1999
-34.5 C (-30.1 F)
2000
-28.2 C (-18.8 F)
Wettest day (Rx1day)
The wettest day of the year at Ilomantsi Kk, 1959 to 2000. The record is 45.1 mm (1.8 in) in 1991, marked on the chart; the median year is 27.2 mm (1.1 in).
Wettest day (Rx1day) at Ilomantsi Kk by year
Year
Wettest day (Rx1day)
1959
34.9 mm (1.4 in)
1960
24.7 mm (1.0 in)
1961
37.5 mm (1.5 in)
1962
23.5 mm (0.9 in)
1963
17.0 mm (0.7 in)
1964
26.0 mm (1.0 in)
1965
14.2 mm (0.6 in)
1966
24.9 mm (1.0 in)
1967
27.7 mm (1.1 in)
1968
18.0 mm (0.7 in)
1969
35.4 mm (1.4 in)
1970
26.2 mm (1.0 in)
1971
32.9 mm (1.3 in)
1972
44.1 mm (1.7 in)
1973
28.1 mm (1.1 in)
1974
34.6 mm (1.4 in)
1975
28.0 mm (1.1 in)
1976
39.7 mm (1.6 in)
1977
29.4 mm (1.2 in)
1978
24.6 mm (1.0 in)
1979
25.3 mm (1.0 in)
1980
38.2 mm (1.5 in)
1981
27.3 mm (1.1 in)
1982
20.0 mm (0.8 in)
1983
23.7 mm (0.9 in)
1984
23.0 mm (0.9 in)
1985
21.4 mm (0.8 in)
1986
25.2 mm (1.0 in)
1987
40.0 mm (1.6 in)
1988
32.1 mm (1.3 in)
1989
35.2 mm (1.4 in)
1990
24.0 mm (0.9 in)
1991
45.1 mm (1.8 in)
1992
40.9 mm (1.6 in)
1993
22.7 mm (0.9 in)
1994
42.1 mm (1.7 in)
1995
27.2 mm (1.1 in)
1996
27.2 mm (1.1 in)
1997
24.7 mm (1.0 in)
1998
38.3 mm (1.5 in)
1999
15.6 mm (0.6 in)
2000
19.2 mm (0.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Ilomantsi Kk, 1959 to 2000. The record is 89.1 mm (3.5 in) in 1992, marked on the chart; the median year is 51.5 mm (2.0 in).
Wettest five days (Rx5day) at Ilomantsi Kk by year
Year
Wettest five days (Rx5day)
1959
67.1 mm (2.6 in)
1960
68.0 mm (2.7 in)
1961
66.3 mm (2.6 in)
1962
53.1 mm (2.1 in)
1963
42.2 mm (1.7 in)
1964
39.2 mm (1.5 in)
1965
43.0 mm (1.7 in)
1966
55.6 mm (2.2 in)
1967
41.9 mm (1.6 in)
1968
34.0 mm (1.3 in)
1969
47.2 mm (1.9 in)
1970
50.9 mm (2.0 in)
1971
54.5 mm (2.1 in)
1972
64.4 mm (2.5 in)
1973
36.8 mm (1.4 in)
1974
56.5 mm (2.2 in)
1975
39.3 mm (1.5 in)
1976
54.5 mm (2.1 in)
1977
41.6 mm (1.6 in)
1978
42.5 mm (1.7 in)
1979
52.1 mm (2.1 in)
1980
67.2 mm (2.6 in)
1981
45.8 mm (1.8 in)
1982
48.0 mm (1.9 in)
1983
48.1 mm (1.9 in)
1984
50.8 mm (2.0 in)
1985
39.9 mm (1.6 in)
1986
44.7 mm (1.8 in)
1987
81.5 mm (3.2 in)
1988
70.3 mm (2.8 in)
1989
52.3 mm (2.1 in)
1990
40.1 mm (1.6 in)
1991
77.0 mm (3.0 in)
1992
89.1 mm (3.5 in)
1993
40.3 mm (1.6 in)
1994
75.1 mm (3.0 in)
1995
59.3 mm (2.3 in)
1996
62.2 mm (2.4 in)
1997
56.5 mm (2.2 in)
1998
59.9 mm (2.4 in)
1999
36.9 mm (1.5 in)
2000
33.3 mm (1.3 in)
Longest dry spell (CDD)
The longest dry spell of the year at Ilomantsi Kk, 1959 to 2000. The record is 37 days in 1976, marked on the chart; the median year is 19 days.
Longest dry spell (CDD) at Ilomantsi Kk by year
Year
Longest dry spell (CDD)
1959
19 days
1960
23 days
1961
23 days
1962
16 days
1963
18 days
1964
22 days
1965
16 days
1966
19 days
1967
14 days
1968
18 days
1969
23 days
1970
20 days
1971
16 days
1972
26 days
1973
22 days
1974
19 days
1975
18 days
1976
37 days
1977
16 days
1978
37 days
1979
15 days
1980
24 days
1981
20 days
1982
14 days
1983
16 days
1984
16 days
1985
22 days
1986
17 days
1987
17 days
1988
14 days
1989
23 days
1990
36 days
1991
20 days
1992
25 days
1993
17 days
1994
26 days
1995
17 days
1996
16 days
1997
13 days
1998
16 days
1999
16 days
2000
25 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
38 years with a frost
Across 38 years with a frost, the median last spring frost at Ilomantsi Kk falls on 25 May and the median first autumn frost on 14 September, which leaves a median of 108 days between them.
Fitted over all years, the growing season changes by -4.7 days per decade at this station.
Frost dates and growing season at Ilomantsi Kk
Measure
Median, all years
Earliest period
Recent period (1970 to 1999)
Recent against earliest
Fitted trend
Last spring frost
25 May
n/a
26 May
n/a
+1.5 days per decade
First autumn frost
14 September
n/a
9 September
n/a
-3.2 days per decade
Growing days
108 days
n/a
104 days
n/a
-4.7 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, 1959 to 1999
A day with at least 28.6 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 51.8 mm (2.0 in) of rain is expected about once in 100 years.
Rainfall return levels at Ilomantsi Kk: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
28.6 mm (1.1 in)
5 years
35.9 mm (1.4 in)
10 years
40.2 mm (1.6 in)
25 years
45.2 mm (1.8 in)
50 years
48.6 mm (1.9 in)
Longer than the 39 years of record
100 years
51.8 mm (2.0 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 1959 to 1999.
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: 45.1 mm (1.8 in) in 1991; 44.1 mm (1.7 in) in 1972; 42.1 mm (1.7 in) in 1994.
Download the Data
Data for Ilomantsi Kk standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Ilomantsi Kk 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.