N Willamette Exp STN Weather Records (USC00356151)
Record envelope, standing records and threshold days for N Willamette Exp STN (USC00356151), Oregon, United States, with 45 years of record.
Key Facts for N Willamette Exp STN
N Willamette Exp STN (USC00356151) is a weather station in Oregon, United States at 45.28 latitude and -122.75 longitude, 46 m (150 ft) above sea level.
The station reports from 1963 to 2007, 45 years of record.
1,464 records set at N Willamette Exp STN still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
N Willamette Exp STN set a daily record high minimum temperature of 16.7 C (62.1 F) on 21 August 2007.
About the Station
Location: Oregon, United States, 45.28 latitude, -122.75 longitude.
Elevation: 46 m (150 ft).
Period of record: 1963 to 2007, 45 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
0 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 N Willamette Exp STN. 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 N Willamette Exp STN, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
18.3 C (64.9 F)
-13.3 C (8.1 F)
n/a
n/a
Feb
22.2 C (72.0 F)
-13.3 C (8.1 F)
n/a
n/a
Mar
25.6 C (78.1 F)
-6.7 C (19.9 F)
n/a
n/a
Apr
30.0 C (86.0 F)
-7.2 C (19.0 F)
n/a
n/a
May
38.3 C (100.9 F)
-1.7 C (28.9 F)
n/a
n/a
Jun
40.0 C (104.0 F)
1.1 C (34.0 F)
n/a
n/a
Jul
40.0 C (104.0 F)
5.0 C (41.0 F)
n/a
n/a
Aug
40.6 C (105.1 F)
2.8 C (37.0 F)
n/a
n/a
Sep
40.6 C (105.1 F)
-1.1 C (30.0 F)
n/a
n/a
Oct
35.0 C (95.0 F)
-3.9 C (25.0 F)
n/a
n/a
Nov
22.2 C (72.0 F)
-10.0 C (14.0 F)
n/a
n/a
Dec
19.4 C (66.9 F)
-19.4 C (-2.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at N Willamette Exp STN still stand. 1972 holds the most, with 58.
Standing records at N Willamette Exp STN by the year they were set
Year set
Standing records
1963
41
1964
54
1965
42
1966
38
1967
32
1968
27
1969
49
1970
46
1971
50
1972
58
1973
37
1974
35
1975
32
1976
43
1977
28
1978
35
1979
41
1980
30
1981
22
1982
24
1983
24
1984
23
1985
39
1986
29
1987
31
1988
26
1989
33
1990
37
1991
26
1992
28
1993
30
1994
21
1995
40
1996
30
1997
18
1998
46
1999
24
2000
15
2001
21
2002
24
2003
30
2004
27
2005
27
2006
30
2007
21
All-Time Record Progression
6 new records
6 all-time records were set at N Willamette Exp STN between 27 October 1994 and 22 July 2006. Each dot is a new record.
When N Willamette Exp STN set new all-time records
Date
Kind
Detail
1994-10-27
Record daily precipitation
Record daily precipitation 121.9 mm (4.8 in)
1998-12-19
Record low maximum temperature
Record low maximum temperature -13.3 C (8.1 F)
1998-12-20
Record low maximum temperature
Record low maximum temperature -15.6 C (3.9 F)
1998-12-24
Record low minimum temperature
Record low minimum temperature -19.4 C (-2.9 F)
2004-07-23
Record high minimum temperature
Record high minimum temperature 21.1 C (70.0 F)
2006-07-22
Record high minimum temperature
Record high minimum temperature 23.9 C (75.0 F)
Wettest Day of Each Month
Oct: 121.9 mm (4.8 in)
The wettest day on record for each calendar month at N Willamette Exp STN. The most was 121.9 mm (4.8 in) on 27 October 1994.
Record daily precipitation for each month at N Willamette Exp STN
Month
Record daily precipitation (mm)
Date
Jan
51.3 mm (2.0 in)
31 January 1997
Feb
68.6 mm (2.7 in)
6 February 1996
Mar
50.8 mm (2.0 in)
4 March 2007
Apr
106.7 mm (4.2 in)
10 April 1982
May
45.2 mm (1.8 in)
17 May 1991
Jun
40.4 mm (1.6 in)
21 June 1984
Jul
44.7 mm (1.8 in)
18 July 1987
Aug
35.6 mm (1.4 in)
29 August 1983
Sep
51.8 mm (2.0 in)
30 September 2005
Oct
121.9 mm (4.8 in)
27 October 1994
Nov
94.2 mm (3.7 in)
19 November 1996
Dec
58.4 mm (2.3 in)
22 December 1964
Period of Record Coverage
1963 to 2007
Complete yearUnder 90 percent of days
45 years of record at N Willamette Exp STN, 1963 to 2007. 3 years have data for under 90 percent of days and are left out of rankings: 2001, 2002, 2007.
Cooler than the station meanWarmer than the station mean
One stripe for each of 40 complete years at N Willamette Exp STN, 1964 to 2006. Blue stripes are years cooler than the station's own mean of 11.5 C (52.6 F); red stripes are warmer. The coolest year was 1964, at 10.1 C (50.3 F), and the warmest was 1992, at 12.8 C (55.0 F). The strongest colour marks a difference of 1.4 C (2.5 F).
Annual mean temperature at N Willamette Exp STN as warming stripes, 1964 to 2006
Year
Annual mean temperature
Difference from the station mean
1964
10.1 C
-1.33 C
1965
11.2 C
-0.27 C
1966
11.4 C
-0.08 C
1967
11.6 C
+0.15 C
1968
11.2 C
-0.32 C
1969
10.8 C
-0.65 C
1970
10.9 C
-0.54 C
1971
10.3 C
-1.21 C
1972
10.8 C
-0.65 C
1973
11.2 C
-0.31 C
1974
11.2 C
-0.24 C
1975
10.9 C
-0.53 C
1976
10.6 C
-0.86 C
1977
11.1 C
-0.39 C
1978
11.2 C
-0.32 C
1979
11.5 C
0.00 C
1980
11.1 C
-0.39 C
1981
11.8 C
+0.29 C
1982
11.1 C
-0.39 C
1983
11.7 C
+0.24 C
1984
11.1 C
-0.33 C
1985
10.4 C
-1.09 C
1986
12.0 C
+0.54 C
1987
12.3 C
+0.82 C
1988
11.6 C
+0.15 C
1989
11.4 C
-0.10 C
1990
11.7 C
+0.25 C
1991
11.7 C
+0.24 C
1992
12.8 C
+1.32 C
1993
11.2 C
-0.31 C
1994
11.8 C
+0.36 C
1995
12.5 C
+1.05 C
1996
11.6 C
+0.14 C
1997
12.1 C
+0.59 C
1998
11.7 C
+0.25 C
1999
11.9 C
+0.40 C
2003
12.6 C
+1.12 C
2004
12.5 C
+1.03 C
2005
12.1 C
+0.59 C
2006
12.3 C
+0.80 C
The annual mean temperature here has risen by 0.4 C (0.3 to 0.5) per decade over 1964 to 2006. In Fahrenheit: 0.7 F (0.5 to 0.9) per decade. The slope is a straight line fitted to 40 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at N Willamette Exp STN
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.4 C (0.3 to 0.5) per decade
0.7 F (0.5 to 0.9) per decade
1964 to 2006
40
Rise
Mean daily maximum
0.3 C (0.1 to 0.5) per decade
0.5 F (0.2 to 0.8) per decade
1964 to 2006
40
Rise
Mean daily minimum
0.5 C (0.3 to 0.6) per decade
0.8 F (0.6 to 1.1) per decade
1964 to 2006
40
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
1963 to 2007
Yearly extremes at N Willamette Exp STN: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
40.6 C (105.1 F)
1977
37.8 C (100.0 F)
45
Coldest night (TNn)
-19.4 C (-2.9 F)
1998
-6.7 C (19.9 F)
45
Wettest day (Rx1day)
121.9 mm (4.8 in)
1994
48.0 mm (1.9 in)
45
Wettest five days (Rx5day)
209.0 mm (8.2 in)
1996
101.2 mm (4.0 in)
45
Longest dry spell (CDD)
80 days
2000
40 days
45
Hottest day (TXx)
The hottest day of the year at N Willamette Exp STN, 1963 to 2007. The record is 40.6 C (105.1 F) in 1977, marked on the chart; the median year is 37.8 C (100.0 F).
Hottest day (TXx) at N Willamette Exp STN by year
Year
Hottest day (TXx)
1963
35.0 C (95.0 F)
1964
33.9 C (93.0 F)
1965
38.9 C (102.0 F)
1966
35.0 C (95.0 F)
1967
38.9 C (102.0 F)
1968
36.7 C (98.1 F)
1969
35.6 C (96.1 F)
1970
36.1 C (97.0 F)
1971
36.7 C (98.1 F)
1972
38.9 C (102.0 F)
1973
36.7 C (98.1 F)
1974
36.1 C (97.0 F)
1975
35.6 C (96.1 F)
1976
34.4 C (93.9 F)
1977
40.6 C (105.1 F)
1978
38.9 C (102.0 F)
1979
39.4 C (102.9 F)
1980
38.9 C (102.0 F)
1981
40.6 C (105.1 F)
1982
37.8 C (100.0 F)
1983
38.3 C (100.9 F)
1984
35.6 C (96.1 F)
1985
37.8 C (100.0 F)
1986
36.7 C (98.1 F)
1987
38.3 C (100.9 F)
1988
40.6 C (105.1 F)
1989
35.0 C (95.0 F)
1990
38.9 C (102.0 F)
1991
37.8 C (100.0 F)
1992
40.0 C (104.0 F)
1993
37.2 C (99.0 F)
1994
38.9 C (102.0 F)
1995
37.8 C (100.0 F)
1996
38.3 C (100.9 F)
1997
37.2 C (99.0 F)
1998
38.9 C (102.0 F)
1999
34.4 C (93.9 F)
2000
36.1 C (97.0 F)
2001
36.1 C (97.0 F)
2002
38.9 C (102.0 F)
2003
37.8 C (100.0 F)
2004
39.4 C (102.9 F)
2005
35.6 C (96.1 F)
2006
40.0 C (104.0 F)
2007
39.4 C (102.9 F)
Coldest night (TNn)
The coldest night of the year at N Willamette Exp STN, 1963 to 2007. The record is -19.4 C (-2.9 F) in 1998, marked on the chart; the median year is -6.7 C (19.9 F).
Coldest night (TNn) at N Willamette Exp STN by year
Year
Coldest night (TNn)
1963
-10.6 C (12.9 F)
1964
-13.3 C (8.1 F)
1965
-5.6 C (21.9 F)
1966
-4.4 C (24.1 F)
1967
-6.1 C (21.0 F)
1968
-6.1 C (21.0 F)
1969
-11.7 C (10.9 F)
1970
-5.6 C (21.9 F)
1971
-6.7 C (19.9 F)
1972
-15.0 C (5.0 F)
1973
-5.6 C (21.9 F)
1974
-13.3 C (8.1 F)
1975
-6.1 C (21.0 F)
1976
-6.1 C (21.0 F)
1977
-10.0 C (14.0 F)
1978
-10.6 C (12.9 F)
1979
-11.7 C (10.9 F)
1980
-11.7 C (10.9 F)
1981
-3.3 C (26.1 F)
1982
-10.0 C (14.0 F)
1983
-14.4 C (6.1 F)
1984
-9.4 C (15.1 F)
1985
-11.7 C (10.9 F)
1986
-3.9 C (25.0 F)
1987
-6.7 C (19.9 F)
1988
-6.7 C (19.9 F)
1989
-13.3 C (8.1 F)
1990
-17.8 C (0.0 F)
1991
-7.2 C (19.0 F)
1992
-6.7 C (19.9 F)
1993
-9.4 C (15.1 F)
1994
-6.1 C (21.0 F)
1995
-7.8 C (18.0 F)
1996
-8.9 C (16.0 F)
1997
-7.2 C (19.0 F)
1998
-19.4 C (-2.9 F)
1999
-3.9 C (25.0 F)
2000
-5.0 C (23.0 F)
2001
-7.2 C (19.0 F)
2002
-5.6 C (21.9 F)
2003
-4.4 C (24.1 F)
2004
-6.7 C (19.9 F)
2005
-6.7 C (19.9 F)
2006
-6.7 C (19.9 F)
2007
-6.1 C (21.0 F)
Wettest day (Rx1day)
The wettest day of the year at N Willamette Exp STN, 1963 to 2007. The record is 121.9 mm (4.8 in) in 1994, marked on the chart; the median year is 48.0 mm (1.9 in).
Wettest day (Rx1day) at N Willamette Exp STN by year
Year
Wettest day (Rx1day)
1963
50.0 mm (2.0 in)
1964
58.4 mm (2.3 in)
1965
42.9 mm (1.7 in)
1966
47.2 mm (1.9 in)
1967
29.0 mm (1.1 in)
1968
52.3 mm (2.1 in)
1969
38.9 mm (1.5 in)
1970
39.4 mm (1.6 in)
1971
40.1 mm (1.6 in)
1972
50.8 mm (2.0 in)
1973
55.6 mm (2.2 in)
1974
51.1 mm (2.0 in)
1975
50.5 mm (2.0 in)
1976
47.2 mm (1.9 in)
1977
46.7 mm (1.8 in)
1978
50.5 mm (2.0 in)
1979
33.0 mm (1.3 in)
1980
51.1 mm (2.0 in)
1981
44.7 mm (1.8 in)
1982
106.7 mm (4.2 in)
1983
42.2 mm (1.7 in)
1984
72.4 mm (2.9 in)
1985
40.1 mm (1.6 in)
1986
31.0 mm (1.2 in)
1987
53.1 mm (2.1 in)
1988
33.8 mm (1.3 in)
1989
48.3 mm (1.9 in)
1990
29.5 mm (1.2 in)
1991
45.2 mm (1.8 in)
1992
47.8 mm (1.9 in)
1993
35.6 mm (1.4 in)
1994
121.9 mm (4.8 in)
1995
62.2 mm (2.4 in)
1996
94.2 mm (3.7 in)
1997
51.3 mm (2.0 in)
1998
55.4 mm (2.2 in)
1999
48.0 mm (1.9 in)
2000
28.7 mm (1.1 in)
2001
26.4 mm (1.0 in)
2002
41.1 mm (1.6 in)
2003
49.3 mm (1.9 in)
2004
25.7 mm (1.0 in)
2005
52.6 mm (2.1 in)
2006
53.3 mm (2.1 in)
2007
50.8 mm (2.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at N Willamette Exp STN, 1963 to 2007. The record is 209.0 mm (8.2 in) in 1996, marked on the chart; the median year is 101.2 mm (4.0 in).
Wettest five days (Rx5day) at N Willamette Exp STN by year
Year
Wettest five days (Rx5day)
1963
110.5 mm (4.4 in)
1964
190.4 mm (7.5 in)
1965
101.5 mm (4.0 in)
1966
116.7 mm (4.6 in)
1967
71.1 mm (2.8 in)
1968
123.6 mm (4.9 in)
1969
82.2 mm (3.2 in)
1970
88.6 mm (3.5 in)
1971
88.1 mm (3.5 in)
1972
106.4 mm (4.2 in)
1973
132.1 mm (5.2 in)
1974
140.3 mm (5.5 in)
1975
83.4 mm (3.3 in)
1976
104.6 mm (4.1 in)
1977
134.9 mm (5.3 in)
1978
87.7 mm (3.5 in)
1979
77.8 mm (3.1 in)
1980
139.5 mm (5.5 in)
1981
84.3 mm (3.3 in)
1982
154.9 mm (6.1 in)
1983
101.2 mm (4.0 in)
1984
132.1 mm (5.2 in)
1985
73.1 mm (2.9 in)
1986
92.5 mm (3.6 in)
1987
130.3 mm (5.1 in)
1988
100.6 mm (4.0 in)
1989
84.2 mm (3.3 in)
1990
98.6 mm (3.9 in)
1991
84.9 mm (3.3 in)
1992
104.6 mm (4.1 in)
1993
89.7 mm (3.5 in)
1994
153.9 mm (6.1 in)
1995
96.5 mm (3.8 in)
1996
209.0 mm (8.2 in)
1997
144.0 mm (5.7 in)
1998
116.7 mm (4.6 in)
1999
87.4 mm (3.4 in)
2000
60.4 mm (2.4 in)
2001
52.1 mm (2.1 in)
2002
93.2 mm (3.7 in)
2003
104.2 mm (4.1 in)
2004
57.6 mm (2.3 in)
2005
135.9 mm (5.4 in)
2006
136.9 mm (5.4 in)
2007
80.9 mm (3.2 in)
Longest dry spell (CDD)
The longest dry spell of the year at N Willamette Exp STN, 1963 to 2007. The record is 80 days in 2000, marked on the chart; the median year is 40 days.
Longest dry spell (CDD) at N Willamette Exp STN by year
Year
Longest dry spell (CDD)
1963
25 days
1964
24 days
1965
37 days
1966
52 days
1967
79 days
1968
24 days
1969
44 days
1970
41 days
1971
41 days
1972
36 days
1973
58 days
1974
52 days
1975
32 days
1976
24 days
1977
33 days
1978
40 days
1979
35 days
1980
54 days
1981
55 days
1982
22 days
1983
23 days
1984
62 days
1985
52 days
1986
45 days
1987
34 days
1988
67 days
1989
24 days
1990
41 days
1991
45 days
1992
31 days
1993
44 days
1994
59 days
1995
24 days
1996
34 days
1997
40 days
1998
27 days
1999
46 days
2000
80 days
2001
22 days
2002
27 days
2003
44 days
2004
33 days
2005
55 days
2006
48 days
2007
31 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
40 years with a frost
Across 40 years with a frost, the median last spring frost at N Willamette Exp STN falls on 14 April and the median first autumn frost on 31 October, which leaves a median of 198 days between them.
Fitted over all years, the growing season changes by +11.1 days per decade at this station.
Frost dates and growing season at N Willamette Exp STN
Measure
Median, all years
Earliest period
Recent period (1974 to 2006)
Recent against earliest
Fitted trend
Last spring frost
14 April
n/a
9 April
n/a
-7.3 days per decade
First autumn frost
31 October
n/a
31 October
n/a
+3.8 days per decade
Growing days
198 days
n/a
201 days
n/a
+11.1 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
42 years, 1963 to 2006
A day with at least 46.0 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 115.8 mm (4.6 in) of rain is expected about once in 100 years.
Rainfall return levels at N Willamette Exp STN: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
46.0 mm (1.8 in)
5 years
60.5 mm (2.4 in)
10 years
71.6 mm (2.8 in)
25 years
87.5 mm (3.4 in)
50 years
100.9 mm (4.0 in)
Longer than the 42 years of record
100 years
115.8 mm (4.6 in)
Longer than the 42 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, 42 years of values from 1963 to 2006.
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: 121.9 mm (4.8 in) in 1994; 106.7 mm (4.2 in) in 1982; 94.2 mm (3.7 in) in 1996.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of N Willamette Exp STN, at 1981. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1981 ran 0.2 C (0.3 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at N Willamette Exp STN, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1981
+0.2
+0.3
likely
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 N Willamette Exp STN standing records by year: CSV or JSON. Field meanings are on the data page.
Data for N Willamette Exp STN 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.