Ylitornio Portimojarvi Weather Records (FIE00145847)

Record envelope, standing records and threshold days for Ylitornio Portimojarvi (FIE00145847), Finland, with 44 years of record.

Key Facts for Ylitornio Portimojarvi

Ylitornio Portimojarvi (FIE00145847) is a weather station in Finland at 66.37 latitude and 23.92 longitude, 79 m (259 ft) above sea level.
The station reports from 1959 to 2002, 44 years of record.
1,464 records set at Ylitornio Portimojarvi still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Ylitornio Portimojarvi set a daily record precipitation of 11.9 mm (0.5 in) on 23 February 2002.

About the Station

Location: Finland, 66.37 latitude, 23.92 longitude.
Elevation: 79 m (259 ft).
Period of record: 1959 to 2002, 44 years.
Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Ylitornio Portimojarvi. 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 Ylitornio Portimojarvi, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	8.7 C (47.7 F)	-44.0 C (-47.2 F)	n/a	n/a
Feb	8.5 C (47.3 F)	-42.5 C (-44.5 F)	n/a	n/a
Mar	10.2 C (50.4 F)	-37.4 C (-35.3 F)	n/a	n/a
Apr	15.0 C (59.0 F)	-25.9 C (-14.6 F)	n/a	n/a
May	28.0 C (82.4 F)	-11.3 C (11.7 F)	n/a	n/a
Jun	31.2 C (88.2 F)	-2.2 C (28.0 F)	n/a	n/a
Jul	31.6 C (88.9 F)	1.9 C (35.4 F)	n/a	n/a
Aug	28.8 C (83.8 F)	-2.5 C (27.5 F)	n/a	n/a
Sep	23.3 C (73.9 F)	-10.9 C (12.4 F)	n/a	n/a
Oct	14.7 C (58.5 F)	-23.7 C (-10.7 F)	n/a	n/a
Nov	11.0 C (51.8 F)	-31.6 C (-24.9 F)	n/a	n/a
Dec	7.3 C (45.1 F)	-37.5 C (-35.5 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Ylitornio Portimojarvi still stand. 1992 holds the most, with 66.

Standing records at Ylitornio Portimojarvi by the year they were set
Year set	Standing records
1959	44
1960	41
1961	32
1962	36
1963	46
1964	36
1965	35
1966	53
1967	40
1968	57
1969	26
1970	22
1971	46
1972	37
1973	48
1974	15
1975	43
1976	31
1977	34
1978	40
1979	26
1980	37
1981	42
1982	24
1983	33
1984	25
1985	32
1986	30
1987	28
1988	32
1989	35
1990	25
1991	21
1992	66
1993	19
1994	18
1995	33
1996	20
1997	33
1998	26
1999	25
2000	35
2001	26
2002	11

All-Time Record Progression

2 new records

2 all-time records were set at Ylitornio Portimojarvi between 28 January 1999 and 28 January 1999. Each dot is a new record.

When Ylitornio Portimojarvi set new all-time records
Date	Kind	Detail
1999-01-28	Record low maximum temperature	Record low maximum temperature -40.6 C (-41.1 F)
1999-01-28	Record low minimum temperature	Record low minimum temperature -44.0 C (-47.2 F)

Wettest Day of Each Month

Aug: 73.1 mm (2.9 in)

The wettest day on record for each calendar month at Ylitornio Portimojarvi. The most was 73.1 mm (2.9 in) on 6 August 1986.

Record daily precipitation for each month at Ylitornio Portimojarvi
Month	Record daily precipitation (mm)	Date
Jan	22.6 mm (0.9 in)	14 January 1989
Feb	20.5 mm (0.8 in)	28 February 1998
Mar	33.4 mm (1.3 in)	23 March 1986
Apr	30.5 mm (1.2 in)	4 April 2000
May	28.5 mm (1.1 in)	28 May 1982
Jun	38.7 mm (1.5 in)	17 June 1987
Jul	34.3 mm (1.4 in)	15 July 1991
Aug	73.1 mm (2.9 in)	6 August 1986
Sep	40.5 mm (1.6 in)	17 September 1997
Oct	35.3 mm (1.4 in)	31 October 1986
Nov	26.7 mm (1.1 in)	18 November 1981
Dec	26.0 mm (1.0 in)	18 December 1966

Period of Record Coverage

1959 to 2002

44 years of record at Ylitornio Portimojarvi, 1959 to 2002. 2 years have data for under 90 percent of days and are left out of rankings: 1959, 2002.

Days with data per year at Ylitornio Portimojarvi
Year	Days with data	Share of year	Complete
1959	245	67%	No
1960	366	100%	Yes
1961	365	100%	Yes
1962	365	100%	Yes
1963	358	98%	Yes
1964	366	100%	Yes
1965	337	92%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	365	100%	Yes
1976	365	100%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	366	100%	Yes
1981	365	100%	Yes
1982	365	100%	Yes
1983	365	100%	Yes
1984	366	100%	Yes
1985	365	100%	Yes
1986	365	100%	Yes
1987	365	100%	Yes
1988	366	100%	Yes
1989	365	100%	Yes
1990	365	100%	Yes
1991	365	100%	Yes
1992	366	100%	Yes
1993	365	100%	Yes
1994	365	100%	Yes
1995	365	100%	Yes
1996	366	100%	Yes
1997	365	100%	Yes
1998	365	100%	Yes
1999	365	100%	Yes
2000	366	100%	Yes
2001	365	100%	Yes
2002	59	16%	No

Latest Records

Latest records at Ylitornio Portimojarvi
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
23 February 2002	Ylitornio Portimojarvi, FI	daily rain	11.9 mm (0.5 in)	0.9 mm (0.04 in)	7 years	9 of 100 (Routine)
22 February 2002	Ylitornio Portimojarvi, FI	daily rain	15.2 mm (0.6 in)	8.8 mm (0.35 in)	35 years	20 of 100 (Routine)
16 February 2002	Ylitornio Portimojarvi, FI	daily high max	6.8 C (44.2 F)	4.1 C (7.4 F)	26 years	16 of 100 (Routine)
10 February 2002	Ylitornio Portimojarvi, FI	daily high min	-1.0 C (30.2 F)	0.4 C (0.7 F)	10 years	7 of 100 (Routine)
18 January 2002	Ylitornio Portimojarvi, FI	daily rain	13.5 mm (0.5 in)	2.4 mm (0.09 in)	28 years	20 of 100 (Routine)
14 January 2002	Ylitornio Portimojarvi, FI	daily high min	-0.2 C (31.6 F)	1.6 C (2.9 F)	18 years	10 of 100 (Routine)
14 January 2002	Ylitornio Portimojarvi, FI	daily high max	5.0 C (41.0 F)	2.5 C (4.5 F)	0 years	7 of 100 (Routine)
13 January 2002	Ylitornio Portimojarvi, FI	daily high max	4.0 C (39.2 F)	2.9 C (5.2 F)	22 years	13 of 100 (Routine)
12 January 2002	Ylitornio Portimojarvi, FI	daily high min	2.1 C (35.8 F)	5.2 C (9.4 F)	6 years	10 of 100 (Routine)
11 January 2002	Ylitornio Portimojarvi, FI	monthly high min	4.5 C (40.1 F)	2.1 C (3.8 F)	0 years	16 of 100 (Routine)
10 January 2002	Ylitornio Portimojarvi, FI	monthly high min	2.4 C (36.3 F)	0.6 C (1.1 F)	9 years	16 of 100 (Routine)
10 January 2002	Ylitornio Portimojarvi, FI	daily high max	6.9 C (44.4 F)	0.7 C (1.3 F)	31 years	13 of 100 (Routine)
1 January 2002	Ylitornio Portimojarvi, FI	daily low max	-23.1 C (-9.6 F)	3.2 C (5.8 F)	36 years	18 of 100 (Routine)
1 January 2002	Ylitornio Portimojarvi, FI	daily low min	-33.0 C (-27.4 F)	1.9 C (3.4 F)	24 years	13 of 100 (Routine)
31 December 2001	Ylitornio Portimojarvi, FI	daily low max	-20.5 C (-4.9 F)	2.0 C (3.6 F)	6 years	7 of 100 (Routine)
15 October 2001	Ylitornio Portimojarvi, FI	daily high max	10.4 C (50.7 F)	0.4 C (0.7 F)	16 years	8 of 100 (Routine)
1 October 2001	Ylitornio Portimojarvi, FI	daily rain	17.4 mm (0.7 in)	12.7 mm (0.5 in)	20 years	20 of 100 (Routine)
1 October 2001	Ylitornio Portimojarvi, FI	daily low min	-5.5 C (22.1 F)	0.2 C (0.4 F)	35 years	14 of 100 (Routine)
21 September 2001	Ylitornio Portimojarvi, FI	daily high min	11.6 C (52.9 F)	1.1 C (2.0 F)	3 years	6 of 100 (Routine)
19 September 2001	Ylitornio Portimojarvi, FI	daily high max	17.1 C (62.8 F)	2.1 C (3.8 F)	12 years	12 of 100 (Routine)

Climate Trend

41 complete years, 1960 to 2001

One stripe for each of 41 complete years at Ylitornio Portimojarvi, 1960 to 2001. Blue stripes are years cooler than the station's own mean of 0.5 C (33.0 F); red stripes are warmer. The coolest year was 1985, at -1.9 C (28.6 F), and the warmest was 2000, at 2.7 C (36.8 F). The strongest colour marks a difference of 2.5 C (4.5 F).

Annual mean temperature at Ylitornio Portimojarvi as warming stripes, 1960 to 2001
Year	Annual mean temperature	Difference from the station mean
1960	0.7 C	+0.14 C
1961	2.2 C	+1.64 C
1962	-0.3 C	-0.85 C
1963	0.0 C	-0.51 C
1964	0.7 C	+0.12 C
1966	-1.3 C	-1.85 C
1967	0.6 C	+0.09 C
1968	-1.1 C	-1.64 C
1969	-0.4 C	-0.93 C
1970	0.1 C	-0.46 C
1971	-0.6 C	-1.16 C
1972	1.6 C	+1.06 C
1973	0.2 C	-0.39 C
1974	2.4 C	+1.90 C
1975	1.7 C	+1.20 C
1976	-0.8 C	-1.33 C
1977	-0.2 C	-0.73 C
1978	-1.0 C	-1.57 C
1979	0.3 C	-0.25 C
1980	-0.7 C	-1.25 C
1981	-1.0 C	-1.53 C
1982	0.8 C	+0.21 C
1983	0.7 C	+0.11 C
1984	1.3 C	+0.72 C
1985	-1.9 C	-2.42 C
1986	0.1 C	-0.42 C
1987	-0.9 C	-1.46 C
1988	0.9 C	+0.34 C
1989	2.4 C	+1.84 C
1990	2.0 C	+1.49 C
1991	1.1 C	+0.56 C
1992	1.6 C	+1.10 C
1993	1.0 C	+0.49 C
1994	0.8 C	+0.30 C
1995	1.1 C	+0.54 C
1996	1.0 C	+0.48 C
1997	1.5 C	+0.94 C
1998	0.3 C	-0.27 C
1999	1.4 C	+0.86 C
2000	2.7 C	+2.15 C
2001	1.3 C	+0.73 C

The annual mean temperature here has risen by 0.32 C (0.04 to 0.60) per decade over 1960 to 2001. In Fahrenheit: 0.6 F (0.1 to 1.1) per decade. The slope is a straight line fitted to 41 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Ylitornio Portimojarvi
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.32 C (0.04 to 0.60) per decade	0.6 F (0.1 to 1.1) per decade	1960 to 2001	41	Rise
Mean daily maximum	0.23 C (-0.03 to 0.49) per decade	0.4 F (-0.1 to 0.9) per decade	1960 to 2001	41	Not clearly different from zero
Mean daily minimum	0.4 C (0.1 to 0.7) per decade	0.7 F (0.2 to 1.3) per decade	1960 to 2001	41	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 Ylitornio Portimojarvi: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	31.6 C (88.9 F)	1970	27.4 C (81.3 F)	44
Coldest night (TNn)	-44.0 C (-47.2 F)	1999	-34.9 C (-30.8 F)	44
Wettest day (Rx1day)	73.1 mm (2.9 in)	1986	26.1 mm (1.0 in)	44
Wettest five days (Rx5day)	91.5 mm (3.6 in)	1986	48.0 mm (1.9 in)	44
Longest dry spell (CDD)	50 days	1974	20 days	44

Hottest day (TXx)

The hottest day of the year at Ylitornio Portimojarvi, 1959 to 2002. The record is 31.6 C (88.9 F) in 1970, marked on the chart; the median year is 27.4 C (81.3 F).

Hottest day (TXx) at Ylitornio Portimojarvi by year
Year	Hottest day (TXx)
1959	28.0 C (82.4 F)
1960	29.7 C (85.5 F)
1961	29.4 C (84.9 F)
1962	23.3 C (73.9 F)
1963	28.4 C (83.1 F)
1964	25.3 C (77.5 F)
1965	25.4 C (77.7 F)
1966	31.2 C (88.2 F)
1967	27.8 C (82.0 F)
1968	28.6 C (83.5 F)
1969	28.8 C (83.8 F)
1970	31.6 C (88.9 F)
1971	29.0 C (84.2 F)
1972	31.1 C (88.0 F)
1973	28.2 C (82.8 F)
1974	29.5 C (85.1 F)
1975	25.5 C (77.9 F)
1976	26.2 C (79.2 F)
1977	26.3 C (79.3 F)
1978	26.7 C (80.1 F)
1979	26.8 C (80.2 F)
1980	29.2 C (84.6 F)
1981	26.6 C (79.9 F)
1982	26.5 C (79.7 F)
1983	27.0 C (80.6 F)
1984	26.3 C (79.3 F)
1985	27.2 C (81.0 F)
1986	29.5 C (85.1 F)
1987	27.0 C (80.6 F)
1988	31.4 C (88.5 F)
1989	27.1 C (80.8 F)
1990	27.5 C (81.5 F)
1991	26.5 C (79.7 F)
1992	28.2 C (82.8 F)
1993	26.0 C (78.8 F)
1994	28.5 C (83.3 F)
1995	28.7 C (83.7 F)
1996	25.1 C (77.2 F)
1997	29.6 C (85.3 F)
1998	26.0 C (78.8 F)
1999	30.3 C (86.5 F)
2000	27.3 C (81.1 F)
2001	26.3 C (79.3 F)
2002	8.5 C (47.3 F)

Coldest night (TNn)

The coldest night of the year at Ylitornio Portimojarvi, 1959 to 2002. The record is -44.0 C (-47.2 F) in 1999, marked on the chart; the median year is -34.9 C (-30.8 F).

Coldest night (TNn) at Ylitornio Portimojarvi by year
Year	Coldest night (TNn)
1959	-36.6 C (-33.9 F)
1960	-37.0 C (-34.6 F)
1961	-29.6 C (-21.3 F)
1962	-35.6 C (-32.1 F)
1963	-37.3 C (-35.1 F)
1964	-32.7 C (-26.9 F)
1965	-32.7 C (-26.9 F)
1966	-42.5 C (-44.5 F)
1967	-36.8 C (-34.2 F)
1968	-34.9 C (-30.8 F)
1969	-34.2 C (-29.6 F)
1970	-32.3 C (-26.1 F)
1971	-37.4 C (-35.3 F)
1972	-33.9 C (-29.0 F)
1973	-36.1 C (-33.0 F)
1974	-29.2 C (-20.6 F)
1975	-30.2 C (-22.4 F)
1976	-36.1 C (-33.0 F)
1977	-38.3 C (-36.9 F)
1978	-35.7 C (-32.3 F)
1979	-36.1 C (-33.0 F)
1980	-38.0 C (-36.4 F)
1981	-37.5 C (-35.5 F)
1982	-35.5 C (-31.9 F)
1983	-32.6 C (-26.7 F)
1984	-32.8 C (-27.0 F)
1985	-39.1 C (-38.4 F)
1986	-34.9 C (-30.8 F)
1987	-36.5 C (-33.7 F)
1988	-35.4 C (-31.7 F)
1989	-31.0 C (-23.8 F)
1990	-29.7 C (-21.5 F)
1991	-33.6 C (-28.5 F)
1992	-25.5 C (-13.9 F)
1993	-30.0 C (-22.0 F)
1994	-31.6 C (-24.9 F)
1995	-34.0 C (-29.2 F)
1996	-30.7 C (-23.3 F)
1997	-30.5 C (-22.9 F)
1998	-37.9 C (-36.2 F)
1999	-44.0 C (-47.2 F)
2000	-28.4 C (-19.1 F)
2001	-31.8 C (-25.2 F)
2002	-35.6 C (-32.1 F)

Wettest day (Rx1day)

The wettest day of the year at Ylitornio Portimojarvi, 1959 to 2002. The record is 73.1 mm (2.9 in) in 1986, marked on the chart; the median year is 26.1 mm (1.0 in).

Wettest day (Rx1day) at Ylitornio Portimojarvi by year
Year	Wettest day (Rx1day)
1959	23.5 mm (0.9 in)
1960	27.2 mm (1.1 in)
1961	28.1 mm (1.1 in)
1962	17.8 mm (0.7 in)
1963	27.4 mm (1.1 in)
1964	26.1 mm (1.0 in)
1965	25.7 mm (1.0 in)
1966	26.0 mm (1.0 in)
1967	47.4 mm (1.9 in)
1968	19.5 mm (0.8 in)
1969	17.0 mm (0.7 in)
1970	23.1 mm (0.9 in)
1971	26.1 mm (1.0 in)
1972	20.2 mm (0.8 in)
1973	20.0 mm (0.8 in)
1974	25.6 mm (1.0 in)
1975	28.5 mm (1.1 in)
1976	27.3 mm (1.1 in)
1977	23.5 mm (0.9 in)
1978	25.8 mm (1.0 in)
1979	23.8 mm (0.9 in)
1980	17.1 mm (0.7 in)
1981	26.9 mm (1.1 in)
1982	28.5 mm (1.1 in)
1983	29.6 mm (1.2 in)
1984	26.0 mm (1.0 in)
1985	23.0 mm (0.9 in)
1986	73.1 mm (2.9 in)
1987	38.7 mm (1.5 in)
1988	19.5 mm (0.8 in)
1989	22.6 mm (0.9 in)
1990	21.7 mm (0.9 in)
1991	34.3 mm (1.4 in)
1992	29.4 mm (1.2 in)
1993	18.8 mm (0.7 in)
1994	16.1 mm (0.6 in)
1995	41.8 mm (1.6 in)
1996	27.7 mm (1.1 in)
1997	40.5 mm (1.6 in)
1998	39.6 mm (1.6 in)
1999	34.5 mm (1.4 in)
2000	30.5 mm (1.2 in)
2001	28.0 mm (1.1 in)
2002	15.2 mm (0.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at Ylitornio Portimojarvi, 1959 to 2002. The record is 91.5 mm (3.6 in) in 1986, marked on the chart; the median year is 48.0 mm (1.9 in).

Wettest five days (Rx5day) at Ylitornio Portimojarvi by year
Year	Wettest five days (Rx5day)
1959	52.3 mm (2.1 in)
1960	35.4 mm (1.4 in)
1961	37.9 mm (1.5 in)
1962	41.9 mm (1.6 in)
1963	35.1 mm (1.4 in)
1964	42.0 mm (1.7 in)
1965	38.9 mm (1.5 in)
1966	48.7 mm (1.9 in)
1967	59.2 mm (2.3 in)
1968	31.1 mm (1.2 in)
1969	54.0 mm (2.1 in)
1970	69.2 mm (2.7 in)
1971	31.3 mm (1.2 in)
1972	35.3 mm (1.4 in)
1973	46.0 mm (1.8 in)
1974	57.3 mm (2.3 in)
1975	32.1 mm (1.3 in)
1976	35.1 mm (1.4 in)
1977	54.7 mm (2.2 in)
1978	60.1 mm (2.4 in)
1979	50.7 mm (2.0 in)
1980	34.3 mm (1.4 in)
1981	57.4 mm (2.3 in)
1982	39.5 mm (1.6 in)
1983	41.1 mm (1.6 in)
1984	67.7 mm (2.7 in)
1985	40.5 mm (1.6 in)
1986	91.5 mm (3.6 in)
1987	45.4 mm (1.8 in)
1988	44.0 mm (1.7 in)
1989	49.2 mm (1.9 in)
1990	47.2 mm (1.9 in)
1991	51.6 mm (2.0 in)
1992	68.4 mm (2.7 in)
1993	43.2 mm (1.7 in)
1994	32.2 mm (1.3 in)
1995	51.9 mm (2.0 in)
1996	64.4 mm (2.5 in)
1997	74.0 mm (2.9 in)
1998	80.5 mm (3.2 in)
1999	59.2 mm (2.3 in)
2000	59.2 mm (2.3 in)
2001	62.0 mm (2.4 in)
2002	29.3 mm (1.2 in)

Longest dry spell (CDD)

The longest dry spell of the year at Ylitornio Portimojarvi, 1959 to 2002. The record is 50 days in 1974, marked on the chart; the median year is 20 days.

Longest dry spell (CDD) at Ylitornio Portimojarvi by year
Year	Longest dry spell (CDD)
1959	21 days
1960	15 days
1961	19 days
1962	19 days
1963	17 days
1964	37 days
1965	14 days
1966	17 days
1967	13 days
1968	19 days
1969	20 days
1970	15 days
1971	20 days
1972	34 days
1973	14 days
1974	50 days
1975	16 days
1976	30 days
1977	19 days
1978	50 days
1979	14 days
1980	23 days
1981	22 days
1982	20 days
1983	21 days
1984	35 days
1985	25 days
1986	26 days
1987	23 days
1988	15 days
1989	14 days
1990	17 days
1991	18 days
1992	32 days
1993	22 days
1994	23 days
1995	23 days
1996	26 days
1997	26 days
1998	18 days
1999	20 days
2000	28 days
2001	15 days
2002	7 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

41 years with a frost

Across 41 years with a frost, the median last spring frost at Ylitornio Portimojarvi falls on 24 May and the median first autumn frost on 2 September, which leaves a median of 101 days between them.

Fitted over all years, the growing season changes by +3.9 days per decade at this station.

Frost dates and growing season at Ylitornio Portimojarvi
Measure	Median, all years	Earliest period	Recent period (1972 to 2001)	Recent against earliest	Fitted trend
Last spring frost	24 May	n/a	24 May	n/a	-0.8 days per decade
First autumn frost	2 September	n/a	3 September	n/a	+3.1 days per decade
Growing days	101 days	n/a	103 days	n/a	+3.9 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

43 years, 1959 to 2001

A day with at least 25.5 mm (1.0 in) of rain is expected about once in 2 years. A day with at least 64.4 mm (2.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Ylitornio Portimojarvi: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	25.5 mm (1.0 in)
5 years	33.0 mm (1.3 in)
10 years	39.0 mm (1.5 in)
25 years	47.9 mm (1.9 in)
50 years	55.6 mm (2.2 in)	Longer than the 43 years of record
100 years	64.4 mm (2.5 in)	Longer than the 43 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, 43 years of values from 1959 to 2001.

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: 73.1 mm (2.9 in) in 1986; 47.4 mm (1.9 in) in 1967; 41.8 mm (1.6 in) in 1995.

Station Changes

1 suspected

One change was suspected in the annual mean temperature of Ylitornio Portimojarvi, at 1983. Each is measured against neighbouring stations.

Relative to 5 neighbouring stations, the station's annual mean temperature from 1983 ran 0.1 C (0.2 F) higher than in the years before (possible change).

Suspected changes in the annual mean temperature at Ylitornio Portimojarvi, against neighbouring stations
Year	Shift (C)	Shift (F)	Strength	Neighbours
1983	+0.1	+0.2	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 Ylitornio Portimojarvi standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Ylitornio Portimojarvi 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.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).