Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Ruokolahti Kotaniemi. 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 Ruokolahti Kotaniemi, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
6.0 C (42.8 F)
-39.2 C (-38.6 F)
n/a
n/a
Feb
8.0 C (46.4 F)
-35.9 C (-32.6 F)
n/a
n/a
Mar
13.3 C (55.9 F)
-31.3 C (-24.3 F)
n/a
n/a
Apr
21.0 C (69.8 F)
-23.3 C (-9.9 F)
n/a
n/a
May
29.3 C (84.7 F)
-7.9 C (17.8 F)
n/a
n/a
Jun
31.2 C (88.2 F)
-1.0 C (30.2 F)
n/a
n/a
Jul
33.1 C (91.6 F)
2.7 C (36.9 F)
n/a
n/a
Aug
29.7 C (85.5 F)
-0.5 C (31.1 F)
n/a
n/a
Sep
26.2 C (79.2 F)
-7.0 C (19.4 F)
n/a
n/a
Oct
17.5 C (63.5 F)
-12.1 C (10.2 F)
n/a
n/a
Nov
11.2 C (52.2 F)
-24.4 C (-11.9 F)
n/a
n/a
Dec
6.4 C (43.5 F)
-35.2 C (-31.4 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Ruokolahti Kotaniemi still stand. 1968 holds the most, with 67.
Standing records at Ruokolahti Kotaniemi by the year they were set
Year set
Standing records
1964
8
1965
41
1966
43
1967
59
1968
67
1969
37
1970
26
1971
37
1972
59
1973
51
1974
34
1975
43
1976
35
1977
47
1978
57
1979
42
1980
36
1981
36
1982
31
1983
38
1984
32
1985
44
1986
29
1987
46
1988
51
1989
61
1990
61
1991
24
1992
65
1993
42
1994
33
1995
63
1996
47
1997
37
1998
2
Wettest Day of Each Month
Jul: 98.9 mm (3.9 in)
The wettest day on record for each calendar month at Ruokolahti Kotaniemi. The most was 98.9 mm (3.9 in) on 11 July 1986.
Record daily precipitation for each month at Ruokolahti Kotaniemi
Month
Record daily precipitation (mm)
Date
Jan
16.3 mm (0.6 in)
30 January 1966
Feb
13.0 mm (0.5 in)
21 February 1990
Mar
23.5 mm (0.9 in)
21 March 1974
Apr
19.0 mm (0.7 in)
28 April 1981
May
37.1 mm (1.5 in)
26 May 1996
Jun
31.6 mm (1.2 in)
29 June 1974
Jul
98.9 mm (3.9 in)
11 July 1986
Aug
36.6 mm (1.4 in)
9 August 1991
Sep
35.6 mm (1.4 in)
11 September 1965
Oct
30.3 mm (1.2 in)
27 October 1988
Nov
20.6 mm (0.8 in)
18 November 1980
Dec
18.1 mm (0.7 in)
21 December 1985
Period of Record Coverage
1964 to 1998
Complete yearUnder 90 percent of days
35 years of record at Ruokolahti Kotaniemi, 1964 to 1998. 2 years have data for under 90 percent of days and are left out of rankings: 1964, 1998.
Cooler than the station meanWarmer than the station mean
One stripe for each of 32 complete years at Ruokolahti Kotaniemi, 1965 to 1996. Blue stripes are years cooler than the station's own mean of 3.3 C (37.9 F); red stripes are warmer. The coolest year was 1987, at 1.4 C (34.5 F), and the warmest was 1989, at 5.8 C (42.4 F). The strongest colour marks a difference of 2.5 C (4.5 F).
Annual mean temperature at Ruokolahti Kotaniemi as warming stripes, 1965 to 1996
Year
Annual mean temperature
Difference from the station mean
1965
2.6 C
-0.73 C
1966
1.7 C
-1.59 C
1967
3.8 C
+0.46 C
1968
2.3 C
-0.98 C
1969
1.9 C
-1.38 C
1970
2.7 C
-0.60 C
1971
2.8 C
-0.46 C
1972
4.4 C
+1.11 C
1973
3.6 C
+0.25 C
1974
4.9 C
+1.55 C
1975
4.9 C
+1.58 C
1976
1.7 C
-1.64 C
1977
2.9 C
-0.43 C
1978
1.5 C
-1.76 C
1979
3.1 C
-0.18 C
1980
2.6 C
-0.67 C
1981
3.3 C
-0.05 C
1982
3.4 C
+0.08 C
1983
4.0 C
+0.69 C
1984
4.1 C
+0.83 C
1985
1.6 C
-1.69 C
1986
3.1 C
-0.17 C
1987
1.4 C
-1.90 C
1988
3.9 C
+0.60 C
1989
5.8 C
+2.48 C
1990
4.7 C
+1.36 C
1991
4.4 C
+1.07 C
1992
4.3 C
+0.98 C
1993
3.3 C
-0.05 C
1994
3.5 C
+0.20 C
1995
4.4 C
+1.07 C
1996
3.3 C
+0.04 C
The annual mean temperature here has risen by 0.42 C (0.00 to 0.83) per decade over 1965 to 1996. In Fahrenheit: 0.75 F (0.00 to 1.50) per decade. The slope is a straight line fitted to 32 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Ruokolahti Kotaniemi
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.42 C (0.00 to 0.83) per decade
0.75 F (0.00 to 1.50) per decade
1965 to 1996
32
Rise
Mean daily maximum
0.40 C (0.00 to 0.80) per decade
0.72 F (-0.01 to 1.44) per decade
1965 to 1996
32
Not clearly different from zero
Mean daily minimum
0.44 C (-0.01 to 0.88) per decade
0.79 F (-0.01 to 1.58) per decade
1965 to 1996
32
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
1964 to 1998
Yearly extremes at Ruokolahti Kotaniemi: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
33.1 C (91.6 F)
1972
28.4 C (83.1 F)
35
Coldest night (TNn)
-39.2 C (-38.6 F)
1987
-31.1 C (-24.0 F)
35
Wettest day (Rx1day)
98.9 mm (3.9 in)
1986
26.1 mm (1.0 in)
35
Wettest five days (Rx5day)
132.1 mm (5.2 in)
1986
47.4 mm (1.9 in)
35
Longest dry spell (CDD)
37 days
1972
20 days
35
Hottest day (TXx)
The hottest day of the year at Ruokolahti Kotaniemi, 1964 to 1998. The record is 33.1 C (91.6 F) in 1972, marked on the chart; the median year is 28.4 C (83.1 F).
Hottest day (TXx) at Ruokolahti Kotaniemi by year
Year
Hottest day (TXx)
1964
17.8 C (64.0 F)
1965
26.0 C (78.8 F)
1966
29.2 C (84.6 F)
1967
29.5 C (85.1 F)
1968
28.6 C (83.5 F)
1969
27.6 C (81.7 F)
1970
30.1 C (86.2 F)
1971
26.3 C (79.3 F)
1972
33.1 C (91.6 F)
1973
30.6 C (87.1 F)
1974
26.4 C (79.5 F)
1975
28.0 C (82.4 F)
1976
25.8 C (78.4 F)
1977
29.8 C (85.6 F)
1978
27.5 C (81.5 F)
1979
26.7 C (80.1 F)
1980
29.0 C (84.2 F)
1981
27.5 C (81.5 F)
1982
27.3 C (81.1 F)
1983
29.1 C (84.4 F)
1984
28.4 C (83.1 F)
1985
29.3 C (84.7 F)
1986
28.8 C (83.8 F)
1987
27.8 C (82.0 F)
1988
31.2 C (88.2 F)
1989
29.3 C (84.7 F)
1990
26.3 C (79.3 F)
1991
27.1 C (80.8 F)
1992
28.4 C (83.1 F)
1993
26.2 C (79.2 F)
1994
32.0 C (89.6 F)
1995
29.5 C (85.1 F)
1996
26.6 C (79.9 F)
1997
28.6 C (83.5 F)
1998
2.0 C (35.6 F)
Coldest night (TNn)
The coldest night of the year at Ruokolahti Kotaniemi, 1964 to 1998. The record is -39.2 C (-38.6 F) in 1987, marked on the chart; the median year is -31.1 C (-24.0 F).
Coldest night (TNn) at Ruokolahti Kotaniemi by year
Year
Coldest night (TNn)
1964
-23.2 C (-9.8 F)
1965
-31.3 C (-24.3 F)
1966
-34.7 C (-30.5 F)
1967
-33.5 C (-28.3 F)
1968
-35.0 C (-31.0 F)
1969
-33.8 C (-28.8 F)
1970
-31.3 C (-24.3 F)
1971
-33.0 C (-27.4 F)
1972
-28.7 C (-19.7 F)
1973
-29.5 C (-21.1 F)
1974
-23.1 C (-9.6 F)
1975
-28.7 C (-19.7 F)
1976
-32.8 C (-27.0 F)
1977
-31.7 C (-25.1 F)
1978
-35.2 C (-31.4 F)
1979
-34.6 C (-30.3 F)
1980
-35.9 C (-32.6 F)
1981
-28.6 C (-19.5 F)
1982
-32.8 C (-27.0 F)
1983
-27.8 C (-18.0 F)
1984
-24.0 C (-11.2 F)
1985
-34.6 C (-30.3 F)
1986
-31.1 C (-24.0 F)
1987
-39.2 C (-38.6 F)
1988
-28.3 C (-18.9 F)
1989
-28.5 C (-19.3 F)
1990
-29.0 C (-20.2 F)
1991
-29.1 C (-20.4 F)
1992
-26.0 C (-14.8 F)
1993
-24.6 C (-12.3 F)
1994
-34.7 C (-30.5 F)
1995
-33.0 C (-27.4 F)
1996
-30.7 C (-23.3 F)
1997
-27.8 C (-18.0 F)
1998
-27.0 C (-16.6 F)
Wettest day (Rx1day)
The wettest day of the year at Ruokolahti Kotaniemi, 1964 to 1998. The record is 98.9 mm (3.9 in) in 1986, marked on the chart; the median year is 26.1 mm (1.0 in).
Wettest day (Rx1day) at Ruokolahti Kotaniemi by year
Year
Wettest day (Rx1day)
1964
28.6 mm (1.1 in)
1965
35.6 mm (1.4 in)
1966
47.7 mm (1.9 in)
1967
25.6 mm (1.0 in)
1968
28.4 mm (1.1 in)
1969
27.6 mm (1.1 in)
1970
20.1 mm (0.8 in)
1971
24.2 mm (1.0 in)
1972
25.4 mm (1.0 in)
1973
28.5 mm (1.1 in)
1974
31.6 mm (1.2 in)
1975
20.6 mm (0.8 in)
1976
17.9 mm (0.7 in)
1977
26.1 mm (1.0 in)
1978
18.8 mm (0.7 in)
1979
21.3 mm (0.8 in)
1980
28.4 mm (1.1 in)
1981
27.9 mm (1.1 in)
1982
28.2 mm (1.1 in)
1983
24.8 mm (1.0 in)
1984
19.2 mm (0.8 in)
1985
26.8 mm (1.1 in)
1986
98.9 mm (3.9 in)
1987
23.4 mm (0.9 in)
1988
30.3 mm (1.2 in)
1989
20.7 mm (0.8 in)
1990
24.3 mm (1.0 in)
1991
36.6 mm (1.4 in)
1992
17.4 mm (0.7 in)
1993
31.9 mm (1.3 in)
1994
29.9 mm (1.2 in)
1995
21.1 mm (0.8 in)
1996
37.1 mm (1.5 in)
1997
21.4 mm (0.8 in)
1998
11.9 mm (0.5 in)
Wettest five days (Rx5day)
The wettest five days of the year at Ruokolahti Kotaniemi, 1964 to 1998. The record is 132.1 mm (5.2 in) in 1986, marked on the chart; the median year is 47.4 mm (1.9 in).
Wettest five days (Rx5day) at Ruokolahti Kotaniemi by year
Year
Wettest five days (Rx5day)
1964
47.4 mm (1.9 in)
1965
49.1 mm (1.9 in)
1966
76.8 mm (3.0 in)
1967
39.2 mm (1.5 in)
1968
36.1 mm (1.4 in)
1969
41.7 mm (1.6 in)
1970
45.9 mm (1.8 in)
1971
39.7 mm (1.6 in)
1972
40.5 mm (1.6 in)
1973
51.7 mm (2.0 in)
1974
67.5 mm (2.7 in)
1975
32.7 mm (1.3 in)
1976
29.1 mm (1.1 in)
1977
54.6 mm (2.1 in)
1978
32.8 mm (1.3 in)
1979
46.1 mm (1.8 in)
1980
57.4 mm (2.3 in)
1981
49.2 mm (1.9 in)
1982
81.5 mm (3.2 in)
1983
51.6 mm (2.0 in)
1984
47.4 mm (1.9 in)
1985
42.9 mm (1.7 in)
1986
132.1 mm (5.2 in)
1987
60.6 mm (2.4 in)
1988
52.3 mm (2.1 in)
1989
34.6 mm (1.4 in)
1990
44.1 mm (1.7 in)
1991
83.6 mm (3.3 in)
1992
27.2 mm (1.1 in)
1993
50.8 mm (2.0 in)
1994
66.5 mm (2.6 in)
1995
34.9 mm (1.4 in)
1996
62.6 mm (2.5 in)
1997
31.2 mm (1.2 in)
1998
16.8 mm (0.7 in)
Longest dry spell (CDD)
The longest dry spell of the year at Ruokolahti Kotaniemi, 1964 to 1998. The record is 37 days in 1972, marked on the chart; the median year is 20 days.
Longest dry spell (CDD) at Ruokolahti Kotaniemi by year
Year
Longest dry spell (CDD)
1964
10 days
1965
33 days
1966
19 days
1967
16 days
1968
18 days
1969
28 days
1970
23 days
1971
23 days
1972
37 days
1973
15 days
1974
19 days
1975
23 days
1976
24 days
1977
12 days
1978
23 days
1979
26 days
1980
20 days
1981
20 days
1982
20 days
1983
16 days
1984
20 days
1985
14 days
1986
25 days
1987
19 days
1988
13 days
1989
12 days
1990
20 days
1991
20 days
1992
23 days
1993
29 days
1994
26 days
1995
21 days
1996
30 days
1997
26 days
1998
2 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
32 years with a frost
Across 32 years with a frost, the median last spring frost at Ruokolahti Kotaniemi falls on 25 May and the median first autumn frost on 18 September, which leaves a median of 120 days 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 Ruokolahti Kotaniemi
Measure
Median, all years
Earliest period
Recent period (1967 to 1996)
Recent against earliest
Fitted trend
Last spring frost
25 May
n/a
25 May
n/a
-1.9 days per decade
First autumn frost
18 September
n/a
18 September
n/a
-3.4 days per decade
Growing days
120 days
n/a
120 days
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.
Rainfall Return Levels
33 years, 1965 to 1997
A day with at least 25.0 mm (1.0 in) of rain is expected about once in 2 years. A day with at least 83.4 mm (3.3 in) of rain is expected about once in 100 years.
Rainfall return levels at Ruokolahti Kotaniemi: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
25.0 mm (1.0 in)
5 years
32.9 mm (1.3 in)
10 years
40.3 mm (1.6 in)
25 years
53.3 mm (2.1 in)
50 years
66.5 mm (2.6 in)
Longer than the 33 years of record
100 years
83.4 mm (3.3 in)
Longer than the 33 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, 33 years of values from 1965 to 1997.
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: 98.9 mm (3.9 in) in 1986; 47.7 mm (1.9 in) in 1966; 37.1 mm (1.5 in) in 1996.
Download the Data
Data for Ruokolahti Kotaniemi standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Ruokolahti Kotaniemi 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.