Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Lammi Vestola. 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 Lammi Vestola, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
6.8 C (44.2 F)
-37.5 C (-35.5 F)
n/a
n/a
Feb
9.0 C (48.2 F)
-37.2 C (-35.0 F)
n/a
n/a
Mar
14.5 C (58.1 F)
-32.5 C (-26.5 F)
n/a
n/a
Apr
23.1 C (73.6 F)
-20.4 C (-4.7 F)
n/a
n/a
May
29.0 C (84.2 F)
-9.4 C (15.1 F)
n/a
n/a
Jun
30.2 C (86.4 F)
-4.5 C (23.9 F)
n/a
n/a
Jul
31.5 C (88.7 F)
-2.0 C (28.4 F)
n/a
n/a
Aug
30.5 C (86.9 F)
-3.3 C (26.1 F)
n/a
n/a
Sep
24.1 C (75.4 F)
-9.8 C (14.4 F)
n/a
n/a
Oct
17.1 C (62.8 F)
-19.7 C (-3.5 F)
n/a
n/a
Nov
9.4 C (48.9 F)
-26.0 C (-14.8 F)
n/a
n/a
Dec
6.7 C (44.1 F)
-35.0 C (-31.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Lammi Vestola still stand. 1977 holds the most, with 70.
Standing records at Lammi Vestola by the year they were set
Year set
Standing records
1970
31
1971
46
1972
62
1973
67
1974
36
1975
59
1976
40
1977
70
1978
60
1979
53
1980
39
1981
36
1982
38
1983
36
1984
53
1985
54
1986
38
1987
62
1988
45
1989
62
1990
42
1991
25
1992
54
1993
33
1994
35
1995
64
1996
43
1997
47
1998
55
1999
62
2000
17
Wettest Day of Each Month
May: 66.9 mm (2.6 in)
The wettest day on record for each calendar month at Lammi Vestola. The most was 66.9 mm (2.6 in) on 31 May 1988.
Record daily precipitation for each month at Lammi Vestola
Month
Record daily precipitation (mm)
Date
Jan
31.8 mm (1.3 in)
23 January 1995
Feb
18.7 mm (0.7 in)
25 February 1990
Mar
20.7 mm (0.8 in)
21 March 1974
Apr
27.9 mm (1.1 in)
17 April 1972
May
66.9 mm (2.6 in)
31 May 1988
Jun
40.6 mm (1.6 in)
13 June 1981
Jul
50.9 mm (2.0 in)
9 July 1996
Aug
42.7 mm (1.7 in)
21 August 1985
Sep
65.6 mm (2.6 in)
12 September 1988
Oct
25.5 mm (1.0 in)
12 October 1985
Nov
24.6 mm (1.0 in)
18 November 1980
Dec
21.1 mm (0.8 in)
30 December 1983
Period of Record Coverage
1970 to 2000
Complete yearUnder 90 percent of days
31 years of record at Lammi Vestola, 1970 to 2000. 1 years have data for under 90 percent of days and are left out of rankings: 2000.
Cooler than the station meanWarmer than the station mean
One stripe for each of 30 complete years at Lammi Vestola, 1970 to 1999. Blue stripes are years cooler than the station's own mean of 2.8 C (37.1 F); red stripes are warmer. The coolest year was 1985, at 0.7 C (33.2 F), and the warmest was 1989, at 4.8 C (40.6 F). The strongest colour marks a difference of 2.2 C (4.0 F).
Annual mean temperature at Lammi Vestola as warming stripes, 1970 to 1999
Year
Annual mean temperature
Difference from the station mean
1970
1.8 C
-1.04 C
1971
2.5 C
-0.34 C
1972
3.6 C
+0.79 C
1973
2.8 C
-0.04 C
1974
4.2 C
+1.36 C
1975
4.1 C
+1.31 C
1976
1.1 C
-1.72 C
1977
2.2 C
-0.61 C
1978
1.3 C
-1.55 C
1979
2.8 C
0.00 C
1980
1.9 C
-0.89 C
1981
2.4 C
-0.40 C
1982
2.9 C
+0.06 C
1983
3.5 C
+0.63 C
1984
3.5 C
+0.72 C
1985
0.7 C
-2.17 C
1986
2.3 C
-0.56 C
1987
0.9 C
-1.94 C
1988
3.2 C
+0.34 C
1989
4.8 C
+1.93 C
1990
4.0 C
+1.19 C
1991
3.6 C
+0.76 C
1992
3.8 C
+0.96 C
1993
2.7 C
-0.09 C
1994
2.7 C
-0.09 C
1995
3.5 C
+0.71 C
1996
2.4 C
-0.42 C
1997
3.2 C
+0.39 C
1998
2.8 C
-0.06 C
1999
3.7 C
+0.84 C
The fitted trend in annual mean temperature here over 1970 to 1999 is 0.2 C (-0.2 to 0.7) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.4 F (-0.3 to 1.2) per decade. The slope is a straight line fitted to 30 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Lammi Vestola
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.2 C (-0.2 to 0.7) per decade
0.4 F (-0.3 to 1.2) per decade
1970 to 1999
30
Not clearly different from zero
Mean daily maximum
0.3 C (-0.1 to 0.7) per decade
0.5 F (-0.2 to 1.3) per decade
1970 to 1999
30
Not clearly different from zero
Mean daily minimum
0.2 C (-0.3 to 0.7) per decade
0.3 F (-0.5 to 1.2) per decade
1970 to 1999
30
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
1970 to 2000
Yearly extremes at Lammi Vestola: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
31.5 C (88.7 F)
1994
27.7 C (81.9 F)
31
Coldest night (TNn)
-37.5 C (-35.5 F)
1987
-32.5 C (-26.5 F)
31
Wettest day (Rx1day)
66.9 mm (2.6 in)
1988
26.8 mm (1.1 in)
31
Wettest five days (Rx5day)
100.9 mm (4.0 in)
1996
54.3 mm (2.1 in)
31
Longest dry spell (CDD)
42 days
1972
23 days
31
Hottest day (TXx)
The hottest day of the year at Lammi Vestola, 1970 to 2000. The record is 31.5 C (88.7 F) in 1994, marked on the chart; the median year is 27.7 C (81.9 F).
Hottest day (TXx) at Lammi Vestola by year
Year
Hottest day (TXx)
1970
28.3 C (82.9 F)
1971
26.9 C (80.4 F)
1972
29.4 C (84.9 F)
1973
28.5 C (83.3 F)
1974
25.0 C (77.0 F)
1975
28.0 C (82.4 F)
1976
25.1 C (77.2 F)
1977
29.8 C (85.6 F)
1978
27.6 C (81.7 F)
1979
27.7 C (81.9 F)
1980
30.5 C (86.9 F)
1981
26.6 C (79.9 F)
1982
27.5 C (81.5 F)
1983
28.3 C (82.9 F)
1984
27.2 C (81.0 F)
1985
27.6 C (81.7 F)
1986
29.2 C (84.6 F)
1987
27.2 C (81.0 F)
1988
30.2 C (86.4 F)
1989
29.3 C (84.7 F)
1990
26.6 C (79.9 F)
1991
27.2 C (81.0 F)
1992
30.1 C (86.2 F)
1993
25.7 C (78.3 F)
1994
31.5 C (88.7 F)
1995
29.1 C (84.4 F)
1996
26.3 C (79.3 F)
1997
28.7 C (83.7 F)
1998
25.9 C (78.6 F)
1999
31.0 C (87.8 F)
2000
23.2 C (73.8 F)
Coldest night (TNn)
The coldest night of the year at Lammi Vestola, 1970 to 2000. The record is -37.5 C (-35.5 F) in 1987, marked on the chart; the median year is -32.5 C (-26.5 F).
Coldest night (TNn) at Lammi Vestola by year
Year
Coldest night (TNn)
1970
-35.1 C (-31.2 F)
1971
-29.4 C (-20.9 F)
1972
-32.0 C (-25.6 F)
1973
-33.8 C (-28.8 F)
1974
-20.9 C (-5.6 F)
1975
-30.3 C (-22.5 F)
1976
-31.6 C (-24.9 F)
1977
-32.5 C (-26.5 F)
1978
-35.5 C (-31.9 F)
1979
-37.2 C (-35.0 F)
1980
-34.8 C (-30.6 F)
1981
-32.5 C (-26.5 F)
1982
-34.7 C (-30.5 F)
1983
-29.1 C (-20.4 F)
1984
-27.5 C (-17.5 F)
1985
-36.6 C (-33.9 F)
1986
-33.0 C (-27.4 F)
1987
-37.5 C (-35.5 F)
1988
-28.5 C (-19.3 F)
1989
-29.9 C (-21.8 F)
1990
-25.7 C (-14.3 F)
1991
-30.3 C (-22.5 F)
1992
-25.6 C (-14.1 F)
1993
-28.1 C (-18.6 F)
1994
-34.6 C (-30.3 F)
1995
-33.6 C (-28.5 F)
1996
-34.5 C (-30.1 F)
1997
-28.4 C (-19.1 F)
1998
-33.1 C (-27.6 F)
1999
-34.0 C (-29.2 F)
2000
-26.0 C (-14.8 F)
Wettest day (Rx1day)
The wettest day of the year at Lammi Vestola, 1970 to 2000. The record is 66.9 mm (2.6 in) in 1988, marked on the chart; the median year is 26.8 mm (1.1 in).
Wettest day (Rx1day) at Lammi Vestola by year
Year
Wettest day (Rx1day)
1970
22.5 mm (0.9 in)
1971
23.4 mm (0.9 in)
1972
34.6 mm (1.4 in)
1973
26.5 mm (1.0 in)
1974
25.6 mm (1.0 in)
1975
24.8 mm (1.0 in)
1976
25.7 mm (1.0 in)
1977
32.4 mm (1.3 in)
1978
18.3 mm (0.7 in)
1979
36.7 mm (1.4 in)
1980
26.6 mm (1.0 in)
1981
40.6 mm (1.6 in)
1982
22.6 mm (0.9 in)
1983
25.0 mm (1.0 in)
1984
42.6 mm (1.7 in)
1985
42.7 mm (1.7 in)
1986
26.8 mm (1.1 in)
1987
31.1 mm (1.2 in)
1988
66.9 mm (2.6 in)
1989
24.3 mm (1.0 in)
1990
18.9 mm (0.7 in)
1991
23.4 mm (0.9 in)
1992
28.3 mm (1.1 in)
1993
33.4 mm (1.3 in)
1994
30.4 mm (1.2 in)
1995
39.5 mm (1.6 in)
1996
50.9 mm (2.0 in)
1997
47.5 mm (1.9 in)
1998
27.3 mm (1.1 in)
1999
24.0 mm (0.9 in)
2000
12.9 mm (0.5 in)
Wettest five days (Rx5day)
The wettest five days of the year at Lammi Vestola, 1970 to 2000. The record is 100.9 mm (4.0 in) in 1996, marked on the chart; the median year is 54.3 mm (2.1 in).
Wettest five days (Rx5day) at Lammi Vestola by year
Year
Wettest five days (Rx5day)
1970
44.9 mm (1.8 in)
1971
58.5 mm (2.3 in)
1972
66.2 mm (2.6 in)
1973
51.0 mm (2.0 in)
1974
69.7 mm (2.7 in)
1975
31.9 mm (1.3 in)
1976
40.2 mm (1.6 in)
1977
47.7 mm (1.9 in)
1978
37.3 mm (1.5 in)
1979
70.3 mm (2.8 in)
1980
55.0 mm (2.2 in)
1981
64.7 mm (2.5 in)
1982
46.6 mm (1.8 in)
1983
51.2 mm (2.0 in)
1984
74.7 mm (2.9 in)
1985
59.9 mm (2.4 in)
1986
55.4 mm (2.2 in)
1987
65.5 mm (2.6 in)
1988
97.7 mm (3.8 in)
1989
50.1 mm (2.0 in)
1990
40.4 mm (1.6 in)
1991
44.6 mm (1.8 in)
1992
54.3 mm (2.1 in)
1993
68.1 mm (2.7 in)
1994
44.2 mm (1.7 in)
1995
56.9 mm (2.2 in)
1996
100.9 mm (4.0 in)
1997
72.5 mm (2.9 in)
1998
52.1 mm (2.1 in)
1999
50.2 mm (2.0 in)
2000
26.9 mm (1.1 in)
Longest dry spell (CDD)
The longest dry spell of the year at Lammi Vestola, 1970 to 2000. The record is 42 days in 1972, marked on the chart; the median year is 23 days.
Longest dry spell (CDD) at Lammi Vestola by year
Year
Longest dry spell (CDD)
1970
32 days
1971
16 days
1972
42 days
1973
15 days
1974
20 days
1975
18 days
1976
23 days
1977
13 days
1978
23 days
1979
25 days
1980
23 days
1981
15 days
1982
14 days
1983
40 days
1984
17 days
1985
11 days
1986
19 days
1987
20 days
1988
14 days
1989
25 days
1990
25 days
1991
16 days
1992
31 days
1993
30 days
1994
36 days
1995
28 days
1996
27 days
1997
23 days
1998
15 days
1999
25 days
2000
15 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
30 years with a frost
Across 30 years with a frost, the median last spring frost at Lammi Vestola falls on 11 June and the median first autumn frost on 21 August, which leaves a median of 73 days between them.
Fitted over all years, the growing season changes by +3.4 days per decade at this station.
Frost dates and growing season at Lammi Vestola
Measure
Median, all years
Earliest period
Recent period (1970 to 1999)
Recent against earliest
Fitted trend
Last spring frost
11 June
n/a
11 June
n/a
-4.5 days per decade
First autumn frost
21 August
n/a
21 August
n/a
-1.1 days per decade
Growing days
73 days
n/a
73 days
n/a
+3.4 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
30 years, 1970 to 1999
A day with at least 28.5 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 76.3 mm (3.0 in) of rain is expected about once in 100 years.
Rainfall return levels at Lammi Vestola: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
28.5 mm (1.1 in)
5 years
37.3 mm (1.5 in)
10 years
44.5 mm (1.8 in)
25 years
55.4 mm (2.2 in)
50 years
65.0 mm (2.6 in)
Longer than the 30 years of record
100 years
76.3 mm (3.0 in)
Longer than the 30 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, 30 years of values from 1970 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: 66.9 mm (2.6 in) in 1988; 50.9 mm (2.0 in) in 1996; 47.5 mm (1.9 in) in 1997.
Download the Data
Data for Lammi Vestola standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Lammi Vestola 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.