Record envelope, standing records and threshold days for Ona II (NOE00109737), Norway, with 72 years of record.
Key Facts for Ona II
Ona II (NOE00109737) is a weather station in Norway at 62.86 latitude and 6.54 longitude, 13 m (43 ft) above sea level.
The station reports from 1955 to 2026, 72 years of record.
1,464 records set at Ona II still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Ona II set a daily record low minimum temperature of 0.2 C (32.4 F) on 5 May 2026.
About the Station
Location: Norway, 62.86 latitude, 6.54 longitude.
Elevation: 13 m (43 ft).
Period of record: 1955 to 2026, 72 years.
Eligible elements: tmax, tmin, prcp.
Daily Record Envelope and 2026
8 days at or beyond a record
Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Ona II. The lines show the 2026 daily maximum and minimum. 8 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Ona II, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
13.8 C (56.8 F)
-10.7 C (12.7 F)
8.5 C (47.3 F)
-4.8 C (23.4 F)
Feb
15.0 C (59.0 F)
-8.9 C (16.0 F)
8.5 C (47.3 F)
-1.7 C (28.9 F)
Mar
13.2 C (55.8 F)
-5.9 C (21.4 F)
12.6 C (54.7 F)
1.6 C (34.9 F)
Apr
21.0 C (69.8 F)
-3.5 C (25.7 F)
14.2 C (57.6 F)
0.4 C (32.7 F)
May
24.0 C (75.2 F)
0.0 C (32.0 F)
18.0 C (64.4 F)
0.2 C (32.4 F)
Jun
25.5 C (77.9 F)
3.0 C (37.4 F)
21.6 C (70.9 F)
8.4 C (47.1 F)
Jul
27.7 C (81.9 F)
6.8 C (44.2 F)
16.8 C (62.2 F)
8.7 C (47.7 F)
Aug
26.0 C (78.8 F)
6.0 C (42.8 F)
18.3 C (64.9 F)
9.1 C (48.4 F)
Sep
24.1 C (75.4 F)
3.6 C (38.5 F)
n/a
n/a
Oct
19.8 C (67.6 F)
-0.4 C (31.3 F)
n/a
n/a
Nov
16.5 C (61.7 F)
-5.8 C (21.6 F)
n/a
n/a
Dec
16.0 C (60.8 F)
-9.4 C (15.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Ona II still stand. 2025 holds the most, with 55.
Standing records at Ona II by the year they were set
Year set
Standing records
1955
32
1956
17
1957
1
1973
31
1974
16
1975
20
1976
20
1977
35
1978
27
1979
36
1980
17
1981
45
1982
27
1983
21
1984
13
1985
26
1986
30
1987
37
1988
14
1989
24
1990
20
1991
15
1992
34
1993
15
1994
30
1995
26
1996
25
1997
37
1998
14
1999
26
2000
29
2001
2
2002
41
2003
19
2004
20
2005
18
2006
42
2007
22
2008
14
2009
16
2010
49
2011
21
2012
30
2013
13
2014
29
2015
33
2016
26
2017
19
2018
30
2019
47
2020
43
2021
11
2022
31
2023
20
2024
36
2025
55
2026
17
All-Time Record Progression
3 new records
3 all-time records were set at Ona II between 28 July 2018 and 23 July 2025. Each dot is a new record.
When Ona II set new all-time records
Date
Kind
Detail
2018-07-28
Record high maximum temperature
Record high maximum temperature 27.7 C (81.9 F)
2025-07-22
Record high minimum temperature
Record high minimum temperature 17.8 C (64.0 F)
2025-07-23
Record high minimum temperature
Record high minimum temperature 18.3 C (64.9 F)
Wettest Day of Each Month
Sep: 75.4 mm (3.0 in)
The wettest day on record for each calendar month at Ona II. The most was 75.4 mm (3.0 in) on 13 September 1997.
Record daily precipitation for each month at Ona II
Month
Record daily precipitation (mm)
Date
Jan
71.5 mm (2.8 in)
11 January 1983
Feb
59.4 mm (2.3 in)
22 February 1992
Mar
55.0 mm (2.2 in)
18 March 2010
Apr
49.2 mm (1.9 in)
1 April 1999
May
37.1 mm (1.5 in)
9 May 1955
Jun
41.5 mm (1.6 in)
22 June 2000
Jul
33.5 mm (1.3 in)
30 July 1992
Aug
48.5 mm (1.9 in)
1 August 1989
Sep
75.4 mm (3.0 in)
13 September 1997
Oct
58.6 mm (2.3 in)
29 October 1983
Nov
56.9 mm (2.2 in)
22 November 1994
Dec
48.0 mm (1.9 in)
27 December 1975
Period of Record Coverage
1955 to 2026
Complete yearUnder 90 percent of days
57 years of record at Ona II, 1955 to 2026. 12 years have data for under 90 percent of days and are left out of rankings: 1955, 1956, 1957, 1973, 1974, 1975, 1976, 1977 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 45 complete years at Ona II, 1976 to 2025. Blue stripes are years cooler than the station's own mean of 7.8 C (46.1 F); red stripes are warmer. The coolest year was 1979, at 6.3 C (43.3 F), and the warmest was 2025, at 9.2 C (48.6 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at Ona II as warming stripes, 1976 to 2025
Year
Annual mean temperature
Difference from the station mean
1976
7.0 C
-0.78 C
1979
6.3 C
-1.54 C
1981
6.5 C
-1.35 C
1982
7.5 C
-0.36 C
1983
7.0 C
-0.78 C
1984
7.3 C
-0.50 C
1985
6.6 C
-1.26 C
1986
6.7 C
-1.16 C
1987
7.0 C
-0.83 C
1988
7.6 C
-0.24 C
1989
8.1 C
+0.30 C
1990
8.4 C
+0.56 C
1991
7.9 C
+0.04 C
1992
8.0 C
+0.17 C
1993
7.2 C
-0.67 C
1994
7.1 C
-0.72 C
1995
7.2 C
-0.66 C
1996
7.0 C
-0.86 C
1997
7.8 C
-0.02 C
1998
7.7 C
-0.16 C
1999
8.1 C
+0.25 C
2000
8.2 C
+0.37 C
2003
8.5 C
+0.72 C
2004
8.3 C
+0.50 C
2005
8.1 C
+0.26 C
2006
8.8 C
+0.99 C
2007
7.9 C
+0.04 C
2008
8.4 C
+0.62 C
2009
8.3 C
+0.45 C
2010
6.5 C
-1.28 C
2011
8.3 C
+0.44 C
2012
7.3 C
-0.49 C
2013
7.7 C
-0.12 C
2014
9.2 C
+1.35 C
2015
8.7 C
+0.83 C
2016
8.4 C
+0.55 C
2017
8.4 C
+0.56 C
2018
8.3 C
+0.44 C
2019
8.1 C
+0.23 C
2020
8.7 C
+0.90 C
2021
8.0 C
+0.20 C
2022
8.4 C
+0.53 C
2023
7.8 C
-0.01 C
2024
8.8 C
+0.97 C
2025
9.2 C
+1.42 C
The annual mean temperature here has risen by 0.4 C (0.2 to 0.5) per decade over 1976 to 2025. In Fahrenheit: 0.6 F (0.4 to 0.9) per decade. The slope is a straight line fitted to 45 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Ona II
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.4 C (0.2 to 0.5) per decade
0.6 F (0.4 to 0.9) per decade
1976 to 2025
45
Rise
Mean daily maximum
0.4 C (0.3 to 0.5) per decade
0.7 F (0.5 to 1.0) per decade
1976 to 2025
45
Rise
Mean daily minimum
0.3 C (0.2 to 0.4) per decade
0.6 F (0.4 to 0.8) per decade
1976 to 2025
45
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
1955 to 2026
Yearly extremes at Ona II: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
27.7 C (81.9 F)
2018
22.3 C (72.1 F)
57
Coldest night (TNn)
-10.7 C (12.7 F)
1982
-4.1 C (24.6 F)
57
Wettest day (Rx1day)
75.4 mm (3.0 in)
1997
39.6 mm (1.6 in)
47
Wettest five days (Rx5day)
152.7 mm (6.0 in)
1982
92.9 mm (3.7 in)
44
Longest dry spell (CDD)
68 days
2018
17 days
44
Hottest day (TXx)
The hottest day of the year at Ona II, 1955 to 2026. The record is 27.7 C (81.9 F) in 2018, marked on the chart; the median year is 22.3 C (72.1 F).
Hottest day (TXx) at Ona II by year
Year
Hottest day (TXx)
1955
15.0 C (59.0 F)
1956
17.8 C (64.0 F)
1957
12.2 C (54.0 F)
1973
24.0 C (75.2 F)
1974
20.0 C (68.0 F)
1975
26.0 C (78.8 F)
1976
21.0 C (69.8 F)
1977
20.0 C (68.0 F)
1978
21.0 C (69.8 F)
1979
19.0 C (66.2 F)
1980
22.6 C (72.7 F)
1981
19.8 C (67.6 F)
1982
25.7 C (78.3 F)
1983
19.8 C (67.6 F)
1984
21.6 C (70.9 F)
1985
20.0 C (68.0 F)
1986
18.6 C (65.5 F)
1987
22.3 C (72.1 F)
1988
21.1 C (70.0 F)
1989
24.5 C (76.1 F)
1990
23.2 C (73.8 F)
1991
23.3 C (73.9 F)
1992
23.3 C (73.9 F)
1993
18.0 C (64.4 F)
1994
23.7 C (74.7 F)
1995
20.2 C (68.4 F)
1996
23.4 C (74.1 F)
1997
24.5 C (76.1 F)
1998
19.7 C (67.5 F)
1999
24.1 C (75.4 F)
2000
21.0 C (69.8 F)
2001
20.2 C (68.4 F)
2002
26.0 C (78.8 F)
2003
22.5 C (72.5 F)
2004
22.6 C (72.7 F)
2005
23.2 C (73.8 F)
2006
25.5 C (77.9 F)
2007
22.0 C (71.6 F)
2008
24.2 C (75.6 F)
2009
24.5 C (76.1 F)
2010
22.8 C (73.0 F)
2011
20.8 C (69.4 F)
2012
21.3 C (70.3 F)
2013
20.5 C (68.9 F)
2014
25.5 C (77.9 F)
2015
24.8 C (76.6 F)
2016
22.3 C (72.1 F)
2017
20.4 C (68.7 F)
2018
27.7 C (81.9 F)
2019
26.4 C (79.5 F)
2020
22.5 C (72.5 F)
2021
21.9 C (71.4 F)
2022
21.4 C (70.5 F)
2023
23.1 C (73.6 F)
2024
24.0 C (75.2 F)
2025
25.0 C (77.0 F)
2026
21.6 C (70.9 F)
Coldest night (TNn)
The coldest night of the year at Ona II, 1955 to 2026. The record is -10.7 C (12.7 F) in 1982, marked on the chart; the median year is -4.1 C (24.6 F).
Coldest night (TNn) at Ona II by year
Year
Coldest night (TNn)
1955
-6.1 C (21.0 F)
1956
-1.1 C (30.0 F)
1957
-3.9 C (25.0 F)
1973
-4.0 C (24.8 F)
1974
-2.0 C (28.4 F)
1975
-3.0 C (26.6 F)
1976
-4.0 C (24.8 F)
1977
-4.0 C (24.8 F)
1978
-9.4 C (15.1 F)
1979
-8.5 C (16.7 F)
1980
-5.6 C (21.9 F)
1981
-9.0 C (15.8 F)
1982
-10.7 C (12.7 F)
1983
-3.0 C (26.6 F)
1984
-3.9 C (25.0 F)
1985
-8.1 C (17.4 F)
1986
-4.8 C (23.4 F)
1987
-8.6 C (16.5 F)
1988
-2.9 C (26.8 F)
1989
-3.0 C (26.6 F)
1990
-2.1 C (28.2 F)
1991
-1.9 C (28.6 F)
1992
-5.9 C (21.4 F)
1993
-4.5 C (23.9 F)
1994
-3.5 C (25.7 F)
1995
-4.0 C (24.8 F)
1996
-5.0 C (23.0 F)
1997
-4.4 C (24.1 F)
1998
-4.7 C (23.5 F)
1999
-4.0 C (24.8 F)
2000
-2.6 C (27.3 F)
2001
-3.8 C (25.2 F)
2002
-4.1 C (24.6 F)
2003
-6.3 C (20.7 F)
2004
-4.6 C (23.7 F)
2005
-2.5 C (27.5 F)
2006
-4.8 C (23.4 F)
2007
-6.2 C (20.8 F)
2008
-3.8 C (25.2 F)
2009
-2.5 C (27.5 F)
2010
-8.9 C (16.0 F)
2011
-4.0 C (24.8 F)
2012
-5.6 C (21.9 F)
2013
-4.6 C (23.7 F)
2014
-5.1 C (22.8 F)
2015
-1.0 C (30.2 F)
2016
-6.8 C (19.8 F)
2017
-2.2 C (28.0 F)
2018
-4.9 C (23.2 F)
2019
-2.2 C (28.0 F)
2020
-2.9 C (26.8 F)
2021
-5.5 C (22.1 F)
2022
-4.2 C (24.4 F)
2023
-5.3 C (22.5 F)
2024
-2.9 C (26.8 F)
2025
-3.9 C (25.0 F)
2026
-4.8 C (23.4 F)
Wettest day (Rx1day)
The wettest day of the year at Ona II, 1955 to 2026. The record is 75.4 mm (3.0 in) in 1997, marked on the chart; the median year is 39.6 mm (1.6 in).
Wettest day (Rx1day) at Ona II by year
Year
Wettest day (Rx1day)
1955
37.1 mm (1.5 in)
1956
33.0 mm (1.3 in)
1957
13.7 mm (0.5 in)
1973
43.9 mm (1.7 in)
1974
32.0 mm (1.3 in)
1975
48.0 mm (1.9 in)
1976
33.0 mm (1.3 in)
1977
27.9 mm (1.1 in)
1978
44.6 mm (1.8 in)
1979
51.2 mm (2.0 in)
1980
39.6 mm (1.6 in)
1981
31.5 mm (1.2 in)
1982
45.5 mm (1.8 in)
1983
71.5 mm (2.8 in)
1984
45.9 mm (1.8 in)
1985
58.2 mm (2.3 in)
1986
65.6 mm (2.6 in)
1987
34.4 mm (1.4 in)
1988
59.9 mm (2.4 in)
1989
63.4 mm (2.5 in)
1990
46.9 mm (1.8 in)
1991
45.9 mm (1.8 in)
1992
59.4 mm (2.3 in)
1993
31.6 mm (1.2 in)
1994
56.9 mm (2.2 in)
1995
46.7 mm (1.8 in)
1996
33.8 mm (1.3 in)
1997
75.4 mm (3.0 in)
1998
27.9 mm (1.1 in)
1999
52.0 mm (2.0 in)
2000
41.5 mm (1.6 in)
2001
n/a
2002
17.5 mm (0.7 in)
2003
n/a
2004
38.0 mm (1.5 in)
2005
28.6 mm (1.1 in)
2006
28.6 mm (1.1 in)
2007
36.0 mm (1.4 in)
2008
52.0 mm (2.0 in)
2009
38.5 mm (1.5 in)
2010
55.0 mm (2.2 in)
2011
35.0 mm (1.4 in)
2012
40.0 mm (1.6 in)
2013
33.5 mm (1.3 in)
2014
38.8 mm (1.5 in)
2015
42.3 mm (1.7 in)
2016
22.9 mm (0.9 in)
2017
27.9 mm (1.1 in)
2018
2.8 mm (0.11 in)
2019
n/a
2020
n/a
2021
n/a
2022
n/a
2023
n/a
2024
n/a
2025
n/a
2026
n/a
Wettest five days (Rx5day)
The wettest five days of the year at Ona II, 1955 to 2026. The record is 152.7 mm (6.0 in) in 1982, marked on the chart; the median year is 92.9 mm (3.7 in).
Wettest five days (Rx5day) at Ona II by year
Year
Wettest five days (Rx5day)
1955
16.7 mm (0.7 in)
1956
n/a
1957
n/a
1973
77.4 mm (3.0 in)
1974
55.9 mm (2.2 in)
1975
92.0 mm (3.6 in)
1976
61.7 mm (2.4 in)
1977
71.6 mm (2.8 in)
1978
111.9 mm (4.4 in)
1979
93.8 mm (3.7 in)
1980
79.5 mm (3.1 in)
1981
102.6 mm (4.0 in)
1982
152.7 mm (6.0 in)
1983
133.7 mm (5.3 in)
1984
95.5 mm (3.8 in)
1985
110.6 mm (4.4 in)
1986
119.1 mm (4.7 in)
1987
77.7 mm (3.1 in)
1988
126.8 mm (5.0 in)
1989
138.8 mm (5.5 in)
1990
111.3 mm (4.4 in)
1991
97.8 mm (3.9 in)
1992
103.5 mm (4.1 in)
1993
81.7 mm (3.2 in)
1994
124.3 mm (4.9 in)
1995
89.9 mm (3.5 in)
1996
62.3 mm (2.5 in)
1997
130.9 mm (5.2 in)
1998
89.0 mm (3.5 in)
1999
83.0 mm (3.3 in)
2000
94.5 mm (3.7 in)
2001
n/a
2002
n/a
2003
n/a
2004
70.3 mm (2.8 in)
2005
86.1 mm (3.4 in)
2006
84.1 mm (3.3 in)
2007
116.6 mm (4.6 in)
2008
101.1 mm (4.0 in)
2009
96.5 mm (3.8 in)
2010
99.6 mm (3.9 in)
2011
106.5 mm (4.2 in)
2012
86.9 mm (3.4 in)
2013
91.8 mm (3.6 in)
2014
109.0 mm (4.3 in)
2015
74.9 mm (2.9 in)
2016
64.1 mm (2.5 in)
2017
63.4 mm (2.5 in)
2018
3.1 mm (0.12 in)
2019
n/a
2020
n/a
2021
n/a
2022
n/a
2023
n/a
2024
n/a
2025
n/a
2026
n/a
Longest dry spell (CDD)
The longest dry spell of the year at Ona II, 1955 to 2026. The record is 68 days in 2018, marked on the chart; the median year is 17 days.
Longest dry spell (CDD) at Ona II by year
Year
Longest dry spell (CDD)
1955
n/a
1956
n/a
1957
n/a
1973
10 days
1974
11 days
1975
7 days
1976
10 days
1977
18 days
1978
18 days
1979
19 days
1980
28 days
1981
13 days
1982
13 days
1983
18 days
1984
17 days
1985
24 days
1986
11 days
1987
17 days
1988
16 days
1989
11 days
1990
18 days
1991
14 days
1992
22 days
1993
21 days
1994
23 days
1995
19 days
1996
15 days
1997
14 days
1998
14 days
1999
22 days
2000
20 days
2001
n/a
2002
2 days
2003
n/a
2004
15 days
2005
15 days
2006
19 days
2007
16 days
2008
15 days
2009
21 days
2010
21 days
2011
15 days
2012
16 days
2013
20 days
2014
38 days
2015
11 days
2016
45 days
2017
17 days
2018
68 days
2019
n/a
2020
n/a
2021
n/a
2022
n/a
2023
n/a
2024
n/a
2025
n/a
2026
n/a
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 Ona II falls on 6 April and the median first autumn frost on 24 November, which leaves a median of 235 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 Ona II
Measure
Median, all years
Earliest period
Recent period (1987 to 2024)
Recent against earliest
Fitted trend
Last spring frost
6 April
n/a
5 April
n/a
-3.5 days per decade
First autumn frost
24 November
n/a
21 November
n/a
-2.1 days per decade
Growing days
235 days
n/a
235 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
37 years, 1975 to 2016
A day with at least 42.7 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 84.1 mm (3.3 in) of rain is expected about once in 100 years.
Rainfall return levels at Ona II: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
42.7 mm (1.7 in)
5 years
54.9 mm (2.2 in)
10 years
62.6 mm (2.5 in)
25 years
71.7 mm (2.8 in)
50 years
78.1 mm (3.1 in)
Longer than the 37 years of record
100 years
84.1 mm (3.3 in)
Longer than the 37 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, 37 years of values from 1975 to 2016.
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: 75.4 mm (3.0 in) in 1997; 71.5 mm (2.8 in) in 1983; 65.6 mm (2.6 in) in 1986.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Ona II standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Ona II 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.