Record envelope, standing records and threshold days for Troutdale (USC00358634), Oregon, United States, with 79 years of record.
Key Facts for Troutdale
Troutdale (USC00358634) is a weather station in Oregon, United States at 45.55 latitude and -122.39 longitude, 10 m (33 ft) above sea level.
The station reports from 1948 to 2026, 79 years of record.
1,464 records set at Troutdale still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Troutdale set a daily record precipitation of 39.6 mm (1.6 in) on 29 June 2026.
About the Station
Location: Oregon, United States, 45.55 latitude, -122.39 longitude.
Elevation: 10 m (33 ft).
Period of record: 1948 to 2026, 79 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
2 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 Troutdale. The lines show the 2026 daily maximum and minimum. 2 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Troutdale, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
18.9 C (66.0 F)
-16.7 C (1.9 F)
6.1 C (43.0 F)
-3.3 C (26.1 F)
Feb
21.1 C (70.0 F)
-17.8 C (0.0 F)
n/a
n/a
Mar
26.1 C (79.0 F)
-9.4 C (15.1 F)
n/a
n/a
Apr
31.7 C (89.1 F)
-4.4 C (24.1 F)
26.7 C (80.1 F)
1.7 C (35.1 F)
May
36.7 C (98.1 F)
-2.8 C (27.0 F)
32.8 C (91.0 F)
5.0 C (41.0 F)
Jun
43.3 C (109.9 F)
1.1 C (34.0 F)
n/a
n/a
Jul
40.6 C (105.1 F)
3.3 C (37.9 F)
n/a
n/a
Aug
42.2 C (108.0 F)
3.3 C (37.9 F)
n/a
n/a
Sep
39.4 C (102.9 F)
-2.2 C (28.0 F)
31.1 C (88.0 F)
5.0 C (41.0 F)
Oct
31.1 C (88.0 F)
-4.4 C (24.1 F)
28.3 C (82.9 F)
7.8 C (46.0 F)
Nov
23.9 C (75.0 F)
-11.1 C (12.0 F)
n/a
n/a
Dec
20.0 C (68.0 F)
-14.4 C (6.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Troutdale still stand. 1950 holds the most, with 54.
Standing records at Troutdale by the year they were set
Year set
Standing records
1948
20
1949
30
1950
54
1951
26
1952
31
1953
13
1959
11
1960
26
1961
24
1962
21
1963
23
1964
23
1965
24
1966
12
1967
18
1968
21
1969
15
1970
19
1971
24
1972
47
1973
16
1974
18
1975
17
1976
18
1977
20
1978
16
1979
14
1980
13
1981
15
1982
18
1983
15
1984
11
1985
28
1986
19
1987
19
1988
16
1989
53
1990
30
1991
23
1992
25
1993
15
1994
16
1995
18
1996
12
1997
7
1998
19
1999
10
2000
6
2001
11
2002
16
2003
33
2004
14
2005
22
2006
44
2007
50
2008
11
2009
15
2010
14
2011
13
2012
15
2013
9
2014
23
2015
15
2016
21
2017
10
2018
12
2019
17
2020
14
2021
23
2022
22
2023
18
2024
11
2025
20
2026
2
All-Time Record Progression
3 new records
3 all-time records were set at Troutdale between 4 February 1989 and 28 June 2021. Each dot is a new record.
When Troutdale set new all-time records
Date
Kind
Detail
1989-02-04
Record low minimum temperature
Record low minimum temperature -17.8 C (0.0 F)
1994-10-27
Record daily precipitation
Record daily precipitation 114.3 mm (4.5 in)
2021-06-28
Record high maximum temperature
Record high maximum temperature 43.3 C (109.9 F)
Wettest Day of Each Month
Oct: 114.3 mm (4.5 in)
The wettest day on record for each calendar month at Troutdale. The most was 114.3 mm (4.5 in) on 27 October 1994.
Record daily precipitation for each month at Troutdale
Month
Record daily precipitation (mm)
Date
Jan
72.1 mm (2.8 in)
6 January 1948
Feb
68.6 mm (2.7 in)
22 February 1982
Mar
51.6 mm (2.0 in)
1 March 1999
Apr
43.2 mm (1.7 in)
26 April 1989
May
42.7 mm (1.7 in)
7 May 2022
Jun
50.8 mm (2.0 in)
14 June 2017
Jul
32.5 mm (1.3 in)
16 July 1978
Aug
38.1 mm (1.5 in)
30 August 2005
Sep
55.9 mm (2.2 in)
18 September 1969
Oct
114.3 mm (4.5 in)
27 October 1994
Nov
90.4 mm (3.6 in)
2 November 2015
Dec
66.0 mm (2.6 in)
13 December 1977
Period of Record Coverage
1948 to 2026
Complete yearUnder 90 percent of days
74 years of record at Troutdale, 1948 to 2026. 17 years have data for under 90 percent of days and are left out of rankings: 1953, 1959, 1980, 1981, 1982, 1983, 1984, 1985 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 55 complete years at Troutdale, 1949 to 2024. Blue stripes are years cooler than the station's own mean of 11.9 C (53.4 F); red stripes are warmer. The coolest year was 1950, at 10.6 C (51.1 F), and the warmest was 1992, at 13.3 C (56.0 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Troutdale as warming stripes, 1949 to 2024
Year
Annual mean temperature
Difference from the station mean
1949
11.0 C
-0.91 C
1950
10.6 C
-1.31 C
1951
11.5 C
-0.40 C
1952
11.6 C
-0.32 C
1960
11.0 C
-0.97 C
1961
12.0 C
+0.09 C
1962
11.6 C
-0.37 C
1964
10.8 C
-1.14 C
1965
12.3 C
+0.39 C
1966
12.2 C
+0.27 C
1967
12.9 C
+1.00 C
1968
12.2 C
+0.32 C
1969
11.8 C
-0.09 C
1970
12.0 C
+0.03 C
1971
11.5 C
-0.38 C
1972
11.6 C
-0.28 C
1973
12.1 C
+0.21 C
1974
12.3 C
+0.41 C
1975
11.8 C
-0.08 C
1976
12.0 C
+0.12 C
1977
12.0 C
+0.06 C
1979
12.0 C
+0.08 C
1980
11.7 C
-0.26 C
1981
12.6 C
+0.70 C
1982
11.7 C
-0.24 C
1984
11.8 C
-0.12 C
1985
10.6 C
-1.29 C
1987
12.7 C
+0.79 C
1988
12.2 C
+0.25 C
1989
11.5 C
-0.40 C
1990
12.8 C
+0.88 C
1991
12.5 C
+0.56 C
1992
13.3 C
+1.41 C
1993
11.7 C
-0.19 C
1994
12.8 C
+0.87 C
2000
11.9 C
-0.07 C
2001
12.0 C
+0.04 C
2002
12.0 C
+0.10 C
2003
12.6 C
+0.69 C
2005
11.0 C
-0.93 C
2008
11.1 C
-0.86 C
2009
11.4 C
-0.51 C
2010
11.6 C
-0.30 C
2011
10.8 C
-1.17 C
2014
12.4 C
+0.47 C
2015
13.2 C
+1.26 C
2016
12.9 C
+0.99 C
2017
11.9 C
-0.02 C
2018
12.3 C
+0.38 C
2019
11.6 C
-0.36 C
2020
12.1 C
+0.13 C
2021
12.2 C
+0.24 C
2022
11.6 C
-0.35 C
2023
12.2 C
+0.30 C
2024
11.9 C
+0.02 C
The fitted trend in annual mean temperature here over 1949 to 2024 is 0.06 C (-0.01 to 0.14) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.12 F (-0.02 to 0.25) per decade. The slope is a straight line fitted to 55 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Troutdale
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.06 C (-0.01 to 0.14) per decade
0.12 F (-0.02 to 0.25) per decade
1949 to 2024
55
Not clearly different from zero
Mean daily maximum
0.00 C (-0.10 to 0.10) per decade
0.00 F (-0.18 to 0.19) per decade
1949 to 2024
55
Not clearly different from zero
Mean daily minimum
0.13 C (0.04 to 0.21) per decade
0.2 F (0.1 to 0.4) per decade
1949 to 2024
55
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
1948 to 2026
Yearly extremes at Troutdale: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
43.3 C (109.9 F)
2021
37.8 C (100.0 F)
74
Coldest night (TNn)
-17.8 C (0.0 F)
1989
-7.2 C (19.0 F)
74
Wettest day (Rx1day)
114.3 mm (4.5 in)
1994
46.4 mm (1.8 in)
74
Wettest five days (Rx5day)
177.8 mm (7.0 in)
1996
93.3 mm (3.7 in)
74
Longest dry spell (CDD)
77 days
2003
34 days
74
Hottest day (TXx)
The hottest day of the year at Troutdale, 1948 to 2026. The record is 43.3 C (109.9 F) in 2021, marked on the chart; the median year is 37.8 C (100.0 F).
Hottest day (TXx) at Troutdale by year
Year
Hottest day (TXx)
1948
33.9 C (93.0 F)
1949
35.0 C (95.0 F)
1950
35.6 C (96.1 F)
1951
37.2 C (99.0 F)
1952
39.4 C (102.9 F)
1953
22.2 C (72.0 F)
1959
32.8 C (91.0 F)
1960
37.2 C (99.0 F)
1961
40.0 C (104.0 F)
1962
35.0 C (95.0 F)
1963
33.3 C (91.9 F)
1964
32.8 C (91.0 F)
1965
40.6 C (105.1 F)
1966
33.9 C (93.0 F)
1967
38.3 C (100.9 F)
1968
37.2 C (99.0 F)
1969
36.7 C (98.1 F)
1970
38.9 C (102.0 F)
1971
38.3 C (100.9 F)
1972
39.4 C (102.9 F)
1973
37.2 C (99.0 F)
1974
36.1 C (97.0 F)
1975
35.6 C (96.1 F)
1976
35.0 C (95.0 F)
1977
42.2 C (108.0 F)
1978
40.0 C (104.0 F)
1979
38.9 C (102.0 F)
1980
38.9 C (102.0 F)
1981
41.1 C (106.0 F)
1982
36.7 C (98.1 F)
1983
36.7 C (98.1 F)
1984
37.2 C (99.0 F)
1985
39.4 C (102.9 F)
1986
39.4 C (102.9 F)
1987
39.4 C (102.9 F)
1988
38.9 C (102.0 F)
1989
36.1 C (97.0 F)
1990
38.9 C (102.0 F)
1991
39.4 C (102.9 F)
1992
40.0 C (104.0 F)
1993
37.2 C (99.0 F)
1994
40.6 C (105.1 F)
1995
38.9 C (102.0 F)
1996
40.0 C (104.0 F)
1997
35.6 C (96.1 F)
1998
40.0 C (104.0 F)
1999
34.4 C (93.9 F)
2000
37.2 C (99.0 F)
2001
37.8 C (100.0 F)
2002
40.0 C (104.0 F)
2003
39.4 C (102.9 F)
2004
37.2 C (99.0 F)
2005
37.2 C (99.0 F)
2006
40.0 C (104.0 F)
2007
37.8 C (100.0 F)
2008
39.4 C (102.9 F)
2009
40.0 C (104.0 F)
2010
38.3 C (100.9 F)
2011
35.0 C (95.0 F)
2012
36.1 C (97.0 F)
2013
34.4 C (93.9 F)
2014
35.6 C (96.1 F)
2015
38.9 C (102.0 F)
2016
37.8 C (100.0 F)
2017
39.4 C (102.9 F)
2018
37.2 C (99.0 F)
2019
36.1 C (97.0 F)
2020
37.2 C (99.0 F)
2021
43.3 C (109.9 F)
2022
37.8 C (100.0 F)
2023
40.6 C (105.1 F)
2024
38.3 C (100.9 F)
2025
38.3 C (100.9 F)
2026
32.8 C (91.0 F)
Coldest night (TNn)
The coldest night of the year at Troutdale, 1948 to 2026. The record is -17.8 C (0.0 F) in 1989, marked on the chart; the median year is -7.2 C (19.0 F).
Coldest night (TNn) at Troutdale by year
Year
Coldest night (TNn)
1948
-5.6 C (21.9 F)
1949
-10.6 C (12.9 F)
1950
-16.1 C (3.0 F)
1951
-7.2 C (19.0 F)
1952
-7.2 C (19.0 F)
1953
-2.8 C (27.0 F)
1959
-2.8 C (27.0 F)
1960
-8.9 C (16.0 F)
1961
-6.7 C (19.9 F)
1962
-10.0 C (14.0 F)
1963
-12.2 C (10.0 F)
1964
-14.4 C (6.1 F)
1965
-7.8 C (18.0 F)
1966
-3.3 C (26.1 F)
1967
-4.4 C (24.1 F)
1968
-14.4 C (6.1 F)
1969
-13.3 C (8.1 F)
1970
-4.4 C (24.1 F)
1971
-4.4 C (24.1 F)
1972
-11.1 C (12.0 F)
1973
-6.7 C (19.9 F)
1974
-10.6 C (12.9 F)
1975
-3.3 C (26.1 F)
1976
-3.3 C (26.1 F)
1977
-6.1 C (21.0 F)
1978
-10.0 C (14.0 F)
1979
-13.3 C (8.1 F)
1980
-8.9 C (16.0 F)
1981
-3.3 C (26.1 F)
1982
-11.7 C (10.9 F)
1983
-12.2 C (10.0 F)
1984
-8.3 C (17.1 F)
1985
-12.8 C (9.0 F)
1986
-4.4 C (24.1 F)
1987
-6.7 C (19.9 F)
1988
-6.1 C (21.0 F)
1989
-17.8 C (0.0 F)
1990
-12.2 C (10.0 F)
1991
-5.0 C (23.0 F)
1992
-3.9 C (25.0 F)
1993
-7.2 C (19.0 F)
1994
-4.4 C (24.1 F)
1995
-5.0 C (23.0 F)
1996
-11.1 C (12.0 F)
1997
-16.7 C (1.9 F)
1998
-8.3 C (17.1 F)
1999
-2.8 C (27.0 F)
2000
-5.6 C (21.9 F)
2001
-2.8 C (27.0 F)
2002
-10.0 C (14.0 F)
2003
-12.2 C (10.0 F)
2004
-15.0 C (5.0 F)
2005
-16.7 C (1.9 F)
2006
-9.4 C (15.1 F)
2007
-16.7 C (1.9 F)
2008
-8.3 C (17.1 F)
2009
-7.8 C (18.0 F)
2010
-8.3 C (17.1 F)
2011
-6.1 C (21.0 F)
2012
-2.2 C (28.0 F)
2013
-10.6 C (12.9 F)
2014
-8.3 C (17.1 F)
2015
-3.9 C (25.0 F)
2016
-3.9 C (25.0 F)
2017
-7.2 C (19.0 F)
2018
-5.6 C (21.9 F)
2019
-3.3 C (26.1 F)
2020
-2.2 C (28.0 F)
2021
-5.6 C (21.9 F)
2022
-5.6 C (21.9 F)
2023
-5.6 C (21.9 F)
2024
-11.7 C (10.9 F)
2025
-5.0 C (23.0 F)
2026
-3.3 C (26.1 F)
Wettest day (Rx1day)
The wettest day of the year at Troutdale, 1948 to 2026. The record is 114.3 mm (4.5 in) in 1994, marked on the chart; the median year is 46.4 mm (1.8 in).
Wettest day (Rx1day) at Troutdale by year
Year
Wettest day (Rx1day)
1948
72.1 mm (2.8 in)
1949
59.9 mm (2.4 in)
1950
51.6 mm (2.0 in)
1951
37.1 mm (1.5 in)
1952
24.6 mm (1.0 in)
1953
44.5 mm (1.8 in)
1959
50.8 mm (2.0 in)
1960
57.7 mm (2.3 in)
1961
56.1 mm (2.2 in)
1962
61.5 mm (2.4 in)
1963
38.1 mm (1.5 in)
1964
37.1 mm (1.5 in)
1965
47.8 mm (1.9 in)
1966
49.0 mm (1.9 in)
1967
33.5 mm (1.3 in)
1968
50.8 mm (2.0 in)
1969
55.9 mm (2.2 in)
1970
43.2 mm (1.7 in)
1971
45.2 mm (1.8 in)
1972
50.8 mm (2.0 in)
1973
46.0 mm (1.8 in)
1974
50.8 mm (2.0 in)
1975
45.7 mm (1.8 in)
1976
27.7 mm (1.1 in)
1977
66.0 mm (2.6 in)
1978
36.6 mm (1.4 in)
1979
45.7 mm (1.8 in)
1980
46.2 mm (1.8 in)
1981
43.2 mm (1.7 in)
1982
68.6 mm (2.7 in)
1983
41.9 mm (1.6 in)
1984
54.6 mm (2.1 in)
1985
32.0 mm (1.3 in)
1986
30.2 mm (1.2 in)
1987
52.3 mm (2.1 in)
1988
30.0 mm (1.2 in)
1989
43.2 mm (1.7 in)
1990
36.8 mm (1.4 in)
1991
38.6 mm (1.5 in)
1992
32.5 mm (1.3 in)
1993
32.5 mm (1.3 in)
1994
114.3 mm (4.5 in)
1995
61.2 mm (2.4 in)
1996
83.3 mm (3.3 in)
1997
51.1 mm (2.0 in)
1998
50.8 mm (2.0 in)
1999
68.8 mm (2.7 in)
2000
38.1 mm (1.5 in)
2001
29.5 mm (1.2 in)
2002
34.3 mm (1.4 in)
2003
48.5 mm (1.9 in)
2004
34.3 mm (1.4 in)
2005
50.8 mm (2.0 in)
2006
63.5 mm (2.5 in)
2007
48.5 mm (1.9 in)
2008
37.8 mm (1.5 in)
2009
59.7 mm (2.4 in)
2010
50.8 mm (2.0 in)
2011
65.8 mm (2.6 in)
2012
51.1 mm (2.0 in)
2013
45.7 mm (1.8 in)
2014
37.6 mm (1.5 in)
2015
90.4 mm (3.6 in)
2016
36.8 mm (1.4 in)
2017
50.8 mm (2.0 in)
2018
50.8 mm (2.0 in)
2019
46.5 mm (1.8 in)
2020
38.1 mm (1.5 in)
2021
35.8 mm (1.4 in)
2022
61.0 mm (2.4 in)
2023
32.5 mm (1.3 in)
2024
44.5 mm (1.8 in)
2025
63.5 mm (2.5 in)
2026
39.6 mm (1.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Troutdale, 1948 to 2026. The record is 177.8 mm (7.0 in) in 1996, marked on the chart; the median year is 93.3 mm (3.7 in).
Wettest five days (Rx5day) at Troutdale by year
Year
Wettest five days (Rx5day)
1948
117.0 mm (4.6 in)
1949
132.0 mm (5.2 in)
1950
119.1 mm (4.7 in)
1951
97.5 mm (3.8 in)
1952
86.5 mm (3.4 in)
1953
102.9 mm (4.1 in)
1959
72.3 mm (2.8 in)
1960
157.0 mm (6.2 in)
1961
123.5 mm (4.9 in)
1962
98.3 mm (3.9 in)
1963
88.0 mm (3.5 in)
1964
125.0 mm (4.9 in)
1965
132.9 mm (5.2 in)
1966
116.4 mm (4.6 in)
1967
94.8 mm (3.7 in)
1968
141.5 mm (5.6 in)
1969
90.6 mm (3.6 in)
1970
128.5 mm (5.1 in)
1971
92.7 mm (3.6 in)
1972
126.8 mm (5.0 in)
1973
93.3 mm (3.7 in)
1974
122.1 mm (4.8 in)
1975
86.3 mm (3.4 in)
1976
77.2 mm (3.0 in)
1977
141.2 mm (5.6 in)
1978
66.1 mm (2.6 in)
1979
89.7 mm (3.5 in)
1980
124.7 mm (4.9 in)
1981
95.3 mm (3.8 in)
1982
98.0 mm (3.9 in)
1983
110.6 mm (4.4 in)
1984
97.0 mm (3.8 in)
1985
57.4 mm (2.3 in)
1986
74.1 mm (2.9 in)
1987
133.7 mm (5.3 in)
1988
89.6 mm (3.5 in)
1989
70.5 mm (2.8 in)
1990
106.4 mm (4.2 in)
1991
88.7 mm (3.5 in)
1992
98.0 mm (3.9 in)
1993
71.5 mm (2.8 in)
1994
160.3 mm (6.3 in)
1995
102.3 mm (4.0 in)
1996
177.8 mm (7.0 in)
1997
72.9 mm (2.9 in)
1998
67.3 mm (2.6 in)
1999
90.2 mm (3.6 in)
2000
68.2 mm (2.7 in)
2001
109.5 mm (4.3 in)
2002
86.7 mm (3.4 in)
2003
131.5 mm (5.2 in)
2004
71.1 mm (2.8 in)
2005
107.4 mm (4.2 in)
2006
162.3 mm (6.4 in)
2007
90.7 mm (3.6 in)
2008
76.6 mm (3.0 in)
2009
59.5 mm (2.3 in)
2010
87.6 mm (3.4 in)
2011
39.9 mm (1.6 in)
2012
66.5 mm (2.6 in)
2013
97.8 mm (3.9 in)
2014
75.5 mm (3.0 in)
2015
99.8 mm (3.9 in)
2016
57.3 mm (2.3 in)
2017
52.1 mm (2.1 in)
2018
73.4 mm (2.9 in)
2019
48.4 mm (1.9 in)
2020
43.9 mm (1.7 in)
2021
48.9 mm (1.9 in)
2022
145.8 mm (5.7 in)
2023
34.6 mm (1.4 in)
2024
50.7 mm (2.0 in)
2025
113.1 mm (4.5 in)
2026
93.2 mm (3.7 in)
Longest dry spell (CDD)
The longest dry spell of the year at Troutdale, 1948 to 2026. The record is 77 days in 2003, marked on the chart; the median year is 34 days.
Longest dry spell (CDD) at Troutdale by year
Year
Longest dry spell (CDD)
1948
17 days
1949
22 days
1950
31 days
1951
52 days
1952
55 days
1953
8 days
1959
30 days
1960
55 days
1961
47 days
1962
37 days
1963
21 days
1964
14 days
1965
39 days
1966
54 days
1967
74 days
1968
25 days
1969
38 days
1970
37 days
1971
20 days
1972
36 days
1973
47 days
1974
31 days
1975
32 days
1976
25 days
1977
36 days
1978
26 days
1979
34 days
1980
57 days
1981
53 days
1982
24 days
1983
31 days
1984
61 days
1985
50 days
1986
39 days
1987
34 days
1988
33 days
1989
22 days
1990
41 days
1991
46 days
1992
25 days
1993
43 days
1994
50 days
1995
27 days
1996
33 days
1997
33 days
1998
48 days
1999
15 days
2000
27 days
2001
33 days
2002
42 days
2003
77 days
2004
32 days
2005
39 days
2006
46 days
2007
28 days
2008
24 days
2009
29 days
2010
25 days
2011
28 days
2012
19 days
2013
44 days
2014
21 days
2015
36 days
2016
16 days
2017
53 days
2018
59 days
2019
32 days
2020
24 days
2021
50 days
2022
73 days
2023
69 days
2024
42 days
2025
21 days
2026
17 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
55 years with a frost
Across 55 years with a frost, the median last spring frost at Troutdale falls on 28 March and the median first autumn frost on 9 November, which leaves a median of 223 days between them.
Fitted over all years, the growing season changes by +4.6 days per decade at this station.
Frost dates and growing season at Troutdale
Measure
Median, all years
Earliest period
Recent period (1984 to 2024)
Recent against earliest
Fitted trend
Last spring frost
28 March
n/a
24 March
n/a
-2.0 days per decade
First autumn frost
9 November
n/a
12 November
n/a
+2.6 days per decade
Growing days
223 days
n/a
231 days
n/a
+4.6 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, 1948 to 2007
A day with at least 44.3 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 93.7 mm (3.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Troutdale: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
44.3 mm (1.7 in)
5 years
56.9 mm (2.2 in)
10 years
65.4 mm (2.6 in)
25 years
76.6 mm (3.0 in)
50 years
85.1 mm (3.4 in)
Longer than the 42 years of record
100 years
93.7 mm (3.7 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 1948 to 2007.
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: 114.3 mm (4.5 in) in 1994; 72.1 mm (2.8 in) in 1948; 66.0 mm (2.6 in) in 1977.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Troutdale, at 1985. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1985 ran 0.3 C (0.6 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Troutdale, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1985
-0.3
-0.6
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 Troutdale standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Troutdale 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.