Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Hattula Leteensuo. 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 Hattula Leteensuo, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
7.7 C (45.9 F)
-38.7 C (-37.7 F)
n/a
n/a
Feb
10.0 C (50.0 F)
-41.9 C (-43.4 F)
n/a
n/a
Mar
15.0 C (59.0 F)
-31.3 C (-24.3 F)
n/a
n/a
Apr
24.4 C (75.9 F)
-22.6 C (-8.7 F)
n/a
n/a
May
29.4 C (84.9 F)
-6.9 C (19.6 F)
n/a
n/a
Jun
31.0 C (87.8 F)
-2.6 C (27.3 F)
n/a
n/a
Jul
33.0 C (91.4 F)
0.8 C (33.4 F)
n/a
n/a
Aug
32.0 C (89.6 F)
-2.0 C (28.4 F)
n/a
n/a
Sep
26.2 C (79.2 F)
-7.0 C (19.4 F)
n/a
n/a
Oct
18.6 C (65.5 F)
-16.5 C (2.3 F)
n/a
n/a
Nov
12.6 C (54.7 F)
-25.0 C (-13.0 F)
n/a
n/a
Dec
8.1 C (46.6 F)
-34.4 C (-29.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Hattula Leteensuo still stand. 2000 holds the most, with 63.
Standing records at Hattula Leteensuo by the year they were set
Year set
Standing records
1959
30
1960
27
1961
26
1962
35
1963
33
1964
17
1965
38
1966
39
1967
36
1968
54
1969
31
1970
16
1971
32
1972
34
1973
50
1974
21
1975
45
1976
34
1977
38
1978
44
1979
26
1980
23
1981
24
1982
33
1983
29
1984
26
1985
31
1986
22
1987
48
1988
34
1989
47
1990
33
1991
17
1992
34
1993
28
1994
22
1995
40
1996
25
1997
32
1998
34
1999
37
2000
63
2001
24
2002
52
All-Time Record Progression
4 new records
4 all-time records were set at Hattula Leteensuo between 11 August 1992 and 6 July 1996. Each dot is a new record.
When Hattula Leteensuo set new all-time records
Date
Kind
Detail
1992-08-11
Record high maximum temperature
Record high maximum temperature 32.0 C (89.6 F)
1994-07-27
Record high maximum temperature
Record high maximum temperature 32.2 C (90.0 F)
1994-07-28
Record high maximum temperature
Record high maximum temperature 33.0 C (91.4 F)
1996-07-06
Record daily precipitation
Record daily precipitation 52.5 mm (2.1 in)
Wettest Day of Each Month
Jul: 52.5 mm (2.1 in)
The wettest day on record for each calendar month at Hattula Leteensuo. The most was 52.5 mm (2.1 in) on 6 July 1996.
Record daily precipitation for each month at Hattula Leteensuo
Month
Record daily precipitation (mm)
Date
Jan
26.6 mm (1.0 in)
1 January 1962
Feb
22.0 mm (0.9 in)
25 February 1990
Mar
25.2 mm (1.0 in)
21 March 1974
Apr
17.0 mm (0.7 in)
25 April 1966
May
32.0 mm (1.3 in)
4 May 1984
Jun
40.2 mm (1.6 in)
14 June 2001
Jul
52.5 mm (2.1 in)
6 July 1996
Aug
37.4 mm (1.5 in)
4 August 1965
Sep
35.2 mm (1.4 in)
15 September 1992
Oct
27.2 mm (1.1 in)
26 October 1962
Nov
32.1 mm (1.3 in)
18 November 1991
Dec
25.6 mm (1.0 in)
6 December 1999
Period of Record Coverage
1959 to 2002
Complete yearUnder 90 percent of days
44 years of record at Hattula Leteensuo, 1959 to 2002. 1 years have data for under 90 percent of days and are left out of rankings: 1959.
Cooler than the station meanWarmer than the station mean
One stripe for each of 43 complete years at Hattula Leteensuo, 1960 to 2002. Blue stripes are years cooler than the station's own mean of 4.0 C (39.1 F); red stripes are warmer. The coolest year was 1985, at 1.8 C (35.3 F), and the warmest was 2000, at 6.3 C (43.3 F). The strongest colour marks a difference of 2.4 C (4.3 F).
Annual mean temperature at Hattula Leteensuo as warming stripes, 1960 to 2002
Year
Annual mean temperature
Difference from the station mean
1960
3.5 C
-0.42 C
1961
5.2 C
+1.20 C
1962
3.1 C
-0.87 C
1963
2.9 C
-1.08 C
1964
3.7 C
-0.31 C
1965
3.2 C
-0.74 C
1966
2.3 C
-1.65 C
1967
3.8 C
-0.15 C
1968
3.1 C
-0.85 C
1969
2.6 C
-1.40 C
1970
2.8 C
-1.15 C
1971
3.7 C
-0.24 C
1972
4.6 C
+0.63 C
1973
3.9 C
-0.08 C
1974
5.1 C
+1.17 C
1975
5.3 C
+1.34 C
1976
2.2 C
-1.78 C
1977
3.2 C
-0.72 C
1978
2.3 C
-1.71 C
1979
3.7 C
-0.31 C
1980
3.1 C
-0.84 C
1981
3.6 C
-0.40 C
1982
4.2 C
+0.22 C
1983
4.6 C
+0.68 C
1984
4.6 C
+0.66 C
1985
1.8 C
-2.13 C
1986
3.4 C
-0.59 C
1987
2.0 C
-1.99 C
1988
4.5 C
+0.52 C
1989
6.1 C
+2.13 C
1990
5.4 C
+1.41 C
1991
4.5 C
+0.54 C
1992
5.1 C
+1.14 C
1993
4.3 C
+0.31 C
1994
4.1 C
+0.18 C
1995
4.9 C
+0.94 C
1996
3.7 C
-0.29 C
1997
4.8 C
+0.80 C
1998
4.3 C
+0.30 C
1999
5.1 C
+1.16 C
2000
6.3 C
+2.31 C
2001
4.9 C
+0.94 C
2002
5.0 C
+1.00 C
The annual mean temperature here has risen by 0.4 C (0.2 to 0.7) per decade over 1960 to 2002. In Fahrenheit: 0.7 F (0.3 to 1.2) per decade. The slope is a straight line fitted to 43 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Hattula Leteensuo
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.4 C (0.2 to 0.7) per decade
0.7 F (0.3 to 1.2) per decade
1960 to 2002
43
Rise
Mean daily maximum
0.4 C (0.1 to 0.6) per decade
0.7 F (0.2 to 1.1) per decade
1960 to 2002
43
Rise
Mean daily minimum
0.5 C (0.2 to 0.7) per decade
0.8 F (0.3 to 1.3) per decade
1960 to 2002
43
Rise
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 2002
Yearly extremes at Hattula Leteensuo: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
33.0 C (91.4 F)
1994
29.4 C (84.9 F)
44
Coldest night (TNn)
-41.9 C (-43.4 F)
1966
-30.7 C (-23.3 F)
44
Wettest day (Rx1day)
52.5 mm (2.1 in)
1996
28.7 mm (1.1 in)
44
Wettest five days (Rx5day)
85.7 mm (3.4 in)
1996
48.2 mm (1.9 in)
44
Longest dry spell (CDD)
43 days
1972
23 days
44
Hottest day (TXx)
The hottest day of the year at Hattula Leteensuo, 1959 to 2002. The record is 33.0 C (91.4 F) in 1994, marked on the chart; the median year is 29.4 C (84.9 F).
Hottest day (TXx) at Hattula Leteensuo by year
Year
Hottest day (TXx)
1959
29.7 C (85.5 F)
1960
28.7 C (83.7 F)
1961
28.5 C (83.3 F)
1962
23.1 C (73.6 F)
1963
30.2 C (86.4 F)
1964
30.2 C (86.4 F)
1965
28.0 C (82.4 F)
1966
30.6 C (87.1 F)
1967
29.7 C (85.5 F)
1968
30.1 C (86.2 F)
1969
30.7 C (87.3 F)
1970
27.1 C (80.8 F)
1971
29.3 C (84.7 F)
1972
30.6 C (87.1 F)
1973
29.7 C (85.5 F)
1974
25.5 C (77.9 F)
1975
30.0 C (86.0 F)
1976
25.6 C (78.1 F)
1977
30.5 C (86.9 F)
1978
27.4 C (81.3 F)
1979
29.4 C (84.9 F)
1980
30.5 C (86.9 F)
1981
27.5 C (81.5 F)
1982
29.0 C (84.2 F)
1983
29.6 C (85.3 F)
1984
28.3 C (82.9 F)
1985
29.4 C (84.9 F)
1986
29.8 C (85.6 F)
1987
29.0 C (84.2 F)
1988
31.0 C (87.8 F)
1989
31.0 C (87.8 F)
1990
28.4 C (83.1 F)
1991
28.6 C (83.5 F)
1992
32.0 C (89.6 F)
1993
27.7 C (81.9 F)
1994
33.0 C (91.4 F)
1995
30.3 C (86.5 F)
1996
27.3 C (81.1 F)
1997
29.5 C (85.1 F)
1998
27.0 C (80.6 F)
1999
31.6 C (88.9 F)
2000
28.6 C (83.5 F)
2001
28.6 C (83.5 F)
2002
28.7 C (83.7 F)
Coldest night (TNn)
The coldest night of the year at Hattula Leteensuo, 1959 to 2002. The record is -41.9 C (-43.4 F) in 1966, marked on the chart; the median year is -30.7 C (-23.3 F).
Coldest night (TNn) at Hattula Leteensuo by year
Year
Coldest night (TNn)
1959
-29.2 C (-20.6 F)
1960
-31.4 C (-24.5 F)
1961
-28.8 C (-19.8 F)
1962
-30.6 C (-23.1 F)
1963
-31.9 C (-25.4 F)
1964
-30.8 C (-23.4 F)
1965
-31.5 C (-24.7 F)
1966
-41.9 C (-43.4 F)
1967
-38.7 C (-37.7 F)
1968
-36.5 C (-33.7 F)
1969
-31.9 C (-25.4 F)
1970
-34.8 C (-30.6 F)
1971
-26.8 C (-16.2 F)
1972
-29.9 C (-21.8 F)
1973
-32.3 C (-26.1 F)
1974
-18.5 C (-1.3 F)
1975
-25.2 C (-13.4 F)
1976
-31.8 C (-25.2 F)
1977
-33.6 C (-28.5 F)
1978
-34.4 C (-29.9 F)
1979
-37.6 C (-35.7 F)
1980
-34.1 C (-29.4 F)
1981
-30.4 C (-22.7 F)
1982
-34.1 C (-29.4 F)
1983
-27.1 C (-16.8 F)
1984
-29.1 C (-20.4 F)
1985
-36.5 C (-33.7 F)
1986
-30.5 C (-22.9 F)
1987
-37.7 C (-35.9 F)
1988
-26.3 C (-15.3 F)
1989
-29.0 C (-20.2 F)
1990
-24.5 C (-12.1 F)
1991
-26.7 C (-16.1 F)
1992
-25.5 C (-13.9 F)
1993
-22.5 C (-8.5 F)
1994
-31.5 C (-24.7 F)
1995
-32.0 C (-25.6 F)
1996
-31.5 C (-24.7 F)
1997
-26.0 C (-14.8 F)
1998
-27.6 C (-17.7 F)
1999
-32.5 C (-26.5 F)
2000
-23.8 C (-10.8 F)
2001
-28.3 C (-18.9 F)
2002
-28.6 C (-19.5 F)
Wettest day (Rx1day)
The wettest day of the year at Hattula Leteensuo, 1959 to 2002. The record is 52.5 mm (2.1 in) in 1996, marked on the chart; the median year is 28.7 mm (1.1 in).
Wettest day (Rx1day) at Hattula Leteensuo by year
Year
Wettest day (Rx1day)
1959
16.4 mm (0.6 in)
1960
25.3 mm (1.0 in)
1961
32.5 mm (1.3 in)
1962
32.2 mm (1.3 in)
1963
20.9 mm (0.8 in)
1964
13.9 mm (0.5 in)
1965
37.4 mm (1.5 in)
1966
18.8 mm (0.7 in)
1967
19.2 mm (0.8 in)
1968
28.8 mm (1.1 in)
1969
33.6 mm (1.3 in)
1970
31.6 mm (1.2 in)
1971
15.5 mm (0.6 in)
1972
40.0 mm (1.6 in)
1973
19.6 mm (0.8 in)
1974
25.2 mm (1.0 in)
1975
17.0 mm (0.7 in)
1976
43.0 mm (1.7 in)
1977
23.6 mm (0.9 in)
1978
26.4 mm (1.0 in)
1979
22.5 mm (0.9 in)
1980
30.9 mm (1.2 in)
1981
31.5 mm (1.2 in)
1982
22.4 mm (0.9 in)
1983
25.2 mm (1.0 in)
1984
32.0 mm (1.3 in)
1985
33.2 mm (1.3 in)
1986
28.5 mm (1.1 in)
1987
29.8 mm (1.2 in)
1988
26.2 mm (1.0 in)
1989
39.2 mm (1.5 in)
1990
22.0 mm (0.9 in)
1991
32.1 mm (1.3 in)
1992
35.2 mm (1.4 in)
1993
33.8 mm (1.3 in)
1994
34.8 mm (1.4 in)
1995
26.8 mm (1.1 in)
1996
52.5 mm (2.1 in)
1997
37.1 mm (1.5 in)
1998
23.2 mm (0.9 in)
1999
26.4 mm (1.0 in)
2000
31.0 mm (1.2 in)
2001
40.2 mm (1.6 in)
2002
21.5 mm (0.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Hattula Leteensuo, 1959 to 2002. The record is 85.7 mm (3.4 in) in 1996, marked on the chart; the median year is 48.2 mm (1.9 in).
Wettest five days (Rx5day) at Hattula Leteensuo by year
Year
Wettest five days (Rx5day)
1959
42.8 mm (1.7 in)
1960
41.1 mm (1.6 in)
1961
70.0 mm (2.8 in)
1962
58.6 mm (2.3 in)
1963
46.4 mm (1.8 in)
1964
34.8 mm (1.4 in)
1965
64.3 mm (2.5 in)
1966
45.5 mm (1.8 in)
1967
38.9 mm (1.5 in)
1968
65.4 mm (2.6 in)
1969
41.6 mm (1.6 in)
1970
51.9 mm (2.0 in)
1971
37.2 mm (1.5 in)
1972
70.5 mm (2.8 in)
1973
36.1 mm (1.4 in)
1974
38.6 mm (1.5 in)
1975
32.8 mm (1.3 in)
1976
46.8 mm (1.8 in)
1977
52.8 mm (2.1 in)
1978
47.6 mm (1.9 in)
1979
52.6 mm (2.1 in)
1980
56.0 mm (2.2 in)
1981
61.0 mm (2.4 in)
1982
37.2 mm (1.5 in)
1983
45.2 mm (1.8 in)
1984
61.2 mm (2.4 in)
1985
39.4 mm (1.6 in)
1986
54.5 mm (2.1 in)
1987
56.7 mm (2.2 in)
1988
47.4 mm (1.9 in)
1989
59.0 mm (2.3 in)
1990
39.8 mm (1.6 in)
1991
57.5 mm (2.3 in)
1992
57.9 mm (2.3 in)
1993
57.4 mm (2.3 in)
1994
58.7 mm (2.3 in)
1995
48.8 mm (1.9 in)
1996
85.7 mm (3.4 in)
1997
80.6 mm (3.2 in)
1998
39.7 mm (1.6 in)
1999
43.5 mm (1.7 in)
2000
42.5 mm (1.7 in)
2001
83.2 mm (3.3 in)
2002
40.8 mm (1.6 in)
Longest dry spell (CDD)
The longest dry spell of the year at Hattula Leteensuo, 1959 to 2002. The record is 43 days in 1972, marked on the chart; the median year is 23 days.
Longest dry spell (CDD) at Hattula Leteensuo by year
Year
Longest dry spell (CDD)
1959
25 days
1960
19 days
1961
23 days
1962
18 days
1963
19 days
1964
29 days
1965
25 days
1966
21 days
1967
15 days
1968
20 days
1969
30 days
1970
23 days
1971
35 days
1972
43 days
1973
15 days
1974
25 days
1975
15 days
1976
22 days
1977
19 days
1978
23 days
1979
20 days
1980
27 days
1981
21 days
1982
20 days
1983
34 days
1984
19 days
1985
18 days
1986
16 days
1987
36 days
1988
17 days
1989
25 days
1990
15 days
1991
15 days
1992
31 days
1993
40 days
1994
36 days
1995
15 days
1996
36 days
1997
27 days
1998
16 days
1999
25 days
2000
24 days
2001
16 days
2002
29 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
43 years with a frost
Across 43 years with a frost, the median last spring frost at Hattula Leteensuo falls on 26 May and the median first autumn frost on 16 September, which leaves a median of 111 days between them.
Fitted over all years, the growing season changes by +2.4 days per decade at this station.
Frost dates and growing season at Hattula Leteensuo
Measure
Median, all years
Earliest period
Recent period (1973 to 2002)
Recent against earliest
Fitted trend
Last spring frost
26 May
n/a
27 May
n/a
-2.1 days per decade
First autumn frost
16 September
n/a
16 September
n/a
+0.2 days per decade
Growing days
111 days
n/a
115 days
n/a
+2.4 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
44 years, 1959 to 2002
A day with at least 28.1 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 48.9 mm (1.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Hattula Leteensuo: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
28.1 mm (1.1 in)
5 years
35.4 mm (1.4 in)
10 years
39.4 mm (1.6 in)
25 years
43.8 mm (1.7 in)
50 years
46.5 mm (1.8 in)
Longer than the 44 years of record
100 years
48.9 mm (1.9 in)
Longer than the 44 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, 44 years of values from 1959 to 2002.
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: 52.5 mm (2.1 in) in 1996; 43.0 mm (1.7 in) in 1976; 40.2 mm (1.6 in) in 2001.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Hattula Leteensuo, at 1998. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1998 ran 0.1 C (0.3 F) higher than in the years before (possible change).
Suspected changes in the annual mean temperature at Hattula Leteensuo, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1998
+0.1
+0.3
possible
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 Hattula Leteensuo standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Hattula Leteensuo 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.