Portland Intl AP Weather Records (USW00024229)

Record envelope, standing records and threshold days for Portland Intl AP (USW00024229), Oregon, United States, with 89 years of record.

Key Facts for Portland Intl AP

Portland Intl AP (USW00024229) is a weather station in Oregon, United States at 45.60 latitude and -122.61 longitude, 7 m (22 ft) above sea level.
The station reports from 1938 to 2026, 89 years of record.
1,464 records set at Portland Intl AP still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Portland Intl AP set a daily record precipitation of 8.9 mm (0.35 in) on 25 June 2026.

About the Station

Location: Oregon, United States, 45.60 latitude, -122.61 longitude.
Elevation: 7 m (22 ft).
Period of record: 1938 to 2026, 89 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

6 days at or beyond a record

The band shows the record high and record low for each calendar day at Portland Intl AP. The lines show the 2026 daily maximum and minimum. 6 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Portland Intl AP, 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)	-18.9 C (-2.0 F)	16.1 C (61.0 F)	-5.6 C (21.9 F)
Feb	21.7 C (71.1 F)	-19.4 C (-2.9 F)	15.0 C (59.0 F)	0.0 C (32.0 F)
Mar	27.8 C (82.0 F)	-7.2 C (19.0 F)	21.7 C (71.1 F)	0.0 C (32.0 F)
Apr	32.2 C (90.0 F)	-1.7 C (28.9 F)	27.8 C (82.0 F)	2.8 C (37.0 F)
May	37.8 C (100.0 F)	-1.7 C (28.9 F)	32.8 C (91.0 F)	5.0 C (41.0 F)
Jun	46.7 C (116.1 F)	3.9 C (39.0 F)	36.1 C (97.0 F)	9.4 C (48.9 F)
Jul	41.7 C (107.1 F)	6.1 C (43.0 F)	37.8 C (100.0 F)	10.6 C (51.1 F)
Aug	42.2 C (108.0 F)	6.7 C (44.1 F)	34.4 C (93.9 F)	11.1 C (52.0 F)
Sep	40.6 C (105.1 F)	1.1 C (34.0 F)	31.1 C (88.0 F)	7.8 C (46.0 F)
Oct	33.3 C (91.9 F)	-3.3 C (26.1 F)	27.8 C (82.0 F)	10.0 C (50.0 F)
Nov	22.8 C (73.0 F)	-10.6 C (12.9 F)	n/a	n/a
Dec	19.4 C (66.9 F)	-14.4 C (6.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Portland Intl AP still stand. 1955 holds the most, with 53.

Standing records at Portland Intl AP by the year they were set
Year set	Standing records
1938	13
1939	18
1940	27
1941	12
1942	7
1943	19
1944	11
1945	19
1946	9
1947	19
1948	17
1949	29
1950	43
1951	20
1952	22
1953	18
1954	26
1955	53
1956	16
1957	16
1958	11
1959	13
1960	26
1961	17
1962	20
1963	24
1964	37
1965	19
1966	13
1967	10
1968	19
1969	12
1970	17
1971	18
1972	33
1973	7
1974	22
1975	17
1976	9
1977	18
1978	13
1979	17
1980	19
1981	13
1982	18
1983	15
1984	12
1985	24
1986	13
1987	19
1988	15
1989	19
1990	14
1991	15
1992	15
1993	7
1994	14
1995	15
1996	10
1997	4
1998	13
1999	6
2000	7
2001	4
2002	16
2003	17
2004	9
2005	7
2006	14
2007	7
2008	13
2009	16
2010	11
2011	10
2012	13
2013	17
2014	15
2015	14
2016	19
2017	14
2018	10
2019	12
2020	12
2021	25
2022	18
2023	26
2024	22
2025	21
2026	9

All-Time Record Progression

6 new records

6 all-time records were set at Portland Intl AP between 30 December 1968 and 28 June 2021. Each dot is a new record.

When Portland Intl AP set new all-time records
Date	Kind	Detail
1968-12-30	Record low maximum temperature	Record low maximum temperature -10.0 C (14.0 F)
1996-11-19	Record daily precipitation	Record daily precipitation 68.3 mm (2.7 in)
2021-06-26	Record high maximum temperature	Record high maximum temperature 42.2 C (108.0 F)
2021-06-27	Record high maximum temperature	Record high maximum temperature 44.4 C (111.9 F)
2021-06-28	Record high maximum temperature	Record high maximum temperature 46.7 C (116.1 F)
2021-06-28	Record high minimum temperature	Record high minimum temperature 23.9 C (75.0 F)

Wettest Day of Each Month

Nov: 68.3 mm (2.7 in)

The wettest day on record for each calendar month at Portland Intl AP. The most was 68.3 mm (2.7 in) on 19 November 1996.

Record daily precipitation for each month at Portland Intl AP
Month	Record daily precipitation (mm)	Date
Jan	63.2 mm (2.5 in)	1 January 2009
Feb	55.6 mm (2.2 in)	5 February 2017
Mar	43.9 mm (1.7 in)	12 March 2026
Apr	31.8 mm (1.3 in)	21 April 1988
May	37.3 mm (1.5 in)	19 May 1968
Jun	43.2 mm (1.7 in)	6 June 1958
Jul	26.9 mm (1.1 in)	9 July 1995
Aug	37.3 mm (1.5 in)	25 August 1977
Sep	56.6 mm (2.2 in)	17 September 1969
Oct	62.0 mm (2.4 in)	27 October 1994
Nov	68.3 mm (2.7 in)	19 November 1996
Dec	67.8 mm (2.7 in)	7 December 2015

Period of Record Coverage

1938 to 2026

89 years of record at Portland Intl AP, 1938 to 2026. 2 years have data for under 90 percent of days and are left out of rankings: 1938, 2026.

Days with data per year at Portland Intl AP
Year	Days with data	Share of year	Complete
1938	275	75%	No
1939	365	100%	Yes
1940	366	100%	Yes
1941	365	100%	Yes
1942	365	100%	Yes
1943	365	100%	Yes
1944	366	100%	Yes
1945	365	100%	Yes
1946	365	100%	Yes
1947	365	100%	Yes
1948	366	100%	Yes
1949	365	100%	Yes
1950	365	100%	Yes
1951	365	100%	Yes
1952	366	100%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	365	100%	Yes
1956	366	100%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	365	100%	Yes
1960	366	100%	Yes
1961	365	100%	Yes
1962	365	100%	Yes
1963	365	100%	Yes
1964	366	100%	Yes
1965	365	100%	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	366	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	365	100%	Yes
2003	365	100%	Yes
2004	366	100%	Yes
2005	365	100%	Yes
2006	365	100%	Yes
2007	365	100%	Yes
2008	366	100%	Yes
2009	365	100%	Yes
2010	365	100%	Yes
2011	365	100%	Yes
2012	366	100%	Yes
2013	365	100%	Yes
2014	365	100%	Yes
2015	365	100%	Yes
2016	366	100%	Yes
2017	365	100%	Yes
2018	365	100%	Yes
2019	365	100%	Yes
2020	366	100%	Yes
2021	365	100%	Yes
2022	365	100%	Yes
2023	365	100%	Yes
2024	366	100%	Yes
2025	365	100%	Yes
2026	282	77%	No

Latest Records

Latest records at Portland Intl AP
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
25 June 2026	Portland Intl AP, US	daily rain	8.9 mm (0.35 in)	1.5 mm (0.06 in)	56 years	20 of 100 (Routine)
15 June 2026	Portland Intl AP, US	daily high min	16.7 C (62.1 F)	1.1 C (2.0 F)	56 years	29 of 100 (Routine)
15 June 2026	Portland Intl AP, US	daily high max	36.1 C (97.0 F)	1.1 C (2.0 F)	60 years	28 of 100 (Routine)
14 June 2026	Portland Intl AP, US	daily high max	34.4 C (93.9 F)	2.7 C (4.9 F)	37 years	24 of 100 (Routine)
3 May 2026	Portland Intl AP, US	daily high max	32.8 C (91.0 F)	1.1 C (2.0 F)	33 years	20 of 100 (Routine)
1 May 2026	Portland Intl AP, US	daily high min (Tie)	11.7 C (53.1 F)	tie	31 years	4 of 100 (Routine)
10 April 2026	Portland Intl AP, US	daily high min (Tie)	10.6 C (51.1 F)	tie	24 years	3 of 100 (Routine)
6 April 2026	Portland Intl AP, US	daily high max	26.1 C (79.0 F)	0.5 C (0.9 F)	19 years	14 of 100 (Routine)
5 April 2026	Portland Intl AP, US	daily high max	26.1 C (79.0 F)	1.1 C (2.0 F)	48 years	24 of 100 (Routine)
1 April 2026	Portland Intl AP, US	daily rain	10.4 mm (0.4 in)	0.5 mm (0.02 in)	29 years	17 of 100 (Routine)
19 March 2026	Portland Intl AP, US	daily high min	10.6 C (51.1 F)	0.6 C (1.1 F)	36 years	20 of 100 (Routine)
17 March 2026	Portland Intl AP, US	daily high min	10.0 C (50.0 F)	1.1 C (2.0 F)	87 years	37 of 100 (Notable)
12 March 2026	Portland Intl AP, US	monthly rain	43.9 mm (1.7 in)	1.0 mm (0.04 in)	11 years	22 of 100 (Routine)
11 March 2026	Portland Intl AP, US	daily rain (Tie)	29.2 mm (1.1 in)	tie	24 years	3 of 100 (Routine)
7 March 2026	Portland Intl AP, US	daily high min (Tie)	9.4 C (48.9 F)	tie	40 years	5 of 100 (Routine)
23 February 2026	Portland Intl AP, US	daily rain	27.4 mm (1.1 in)	0.2 mm (0.01 in)	76 years	30 of 100 (Routine)
5 February 2026	Portland Intl AP, US	daily high max	15.0 C (59.0 F)	0.6 C (1.1 F)	86 years	34 of 100 (Routine)
18 December 2025	Portland Intl AP, US	daily rain	53.3 mm (2.1 in)	21.3 mm (0.8 in)	4 years	32 of 100 (Routine)
17 December 2025	Portland Intl AP, US	daily high max	15.0 C (59.0 F)	0.6 C (1.1 F)	26 years	16 of 100 (Routine)
16 December 2025	Portland Intl AP, US	daily high min	11.1 C (52.0 F)	2.2 C (4.0 F)	52 years	28 of 100 (Routine)

Climate Trend

87 complete years, 1939 to 2025

One stripe for each of 87 complete years at Portland Intl AP, 1939 to 2025. Blue stripes are years cooler than the station's own mean of 12.2 C (54.0 F); red stripes are warmer. The coolest year was 1964, at 10.0 C (50.1 F), and the warmest was 2015, at 14.1 C (57.3 F). The strongest colour marks a difference of 2.2 C (4.0 F).

Annual mean temperature at Portland Intl AP as warming stripes, 1939 to 2025
Year	Annual mean temperature	Difference from the station mean
1939	13.0 C	+0.74 C
1940	13.3 C	+1.03 C
1941	12.7 C	+0.50 C
1942	11.9 C	-0.37 C
1943	11.5 C	-0.69 C
1944	11.8 C	-0.39 C
1945	11.8 C	-0.38 C
1946	11.7 C	-0.57 C
1947	12.4 C	+0.14 C
1948	11.2 C	-1.00 C
1949	11.0 C	-1.25 C
1950	10.8 C	-1.38 C
1951	11.5 C	-0.74 C
1952	11.6 C	-0.63 C
1953	11.9 C	-0.34 C
1954	10.9 C	-1.31 C
1955	10.2 C	-1.98 C
1956	10.9 C	-1.30 C
1957	11.3 C	-0.94 C
1958	12.9 C	+0.69 C
1959	11.5 C	-0.77 C
1960	11.2 C	-1.03 C
1961	12.2 C	-0.07 C
1962	11.7 C	-0.57 C
1963	11.2 C	-1.05 C
1964	10.0 C	-2.19 C
1965	12.0 C	-0.18 C
1966	12.0 C	-0.21 C
1967	12.4 C	+0.13 C
1968	11.6 C	-0.66 C
1969	11.5 C	-0.68 C
1970	12.0 C	-0.24 C
1971	11.5 C	-0.69 C
1972	12.2 C	-0.04 C
1973	12.4 C	+0.13 C
1974	12.3 C	+0.09 C
1975	11.7 C	-0.54 C
1976	11.6 C	-0.66 C
1977	11.6 C	-0.65 C
1978	11.4 C	-0.84 C
1979	12.6 C	+0.34 C
1980	12.0 C	-0.22 C
1981	12.7 C	+0.44 C
1982	12.0 C	-0.18 C
1983	12.6 C	+0.33 C
1984	12.2 C	+0.00 C
1985	11.2 C	-1.00 C
1986	12.6 C	+0.36 C
1987	13.0 C	+0.73 C
1988	12.3 C	+0.09 C
1989	12.0 C	-0.26 C
1990	12.6 C	+0.34 C
1991	12.4 C	+0.19 C
1992	13.4 C	+1.22 C
1993	11.8 C	-0.41 C
1994	12.8 C	+0.61 C
1995	13.1 C	+0.90 C
1996	12.2 C	-0.05 C
1997	12.7 C	+0.43 C
1998	12.9 C	+0.68 C
1999	12.3 C	+0.04 C
2000	12.0 C	-0.20 C
2001	12.1 C	-0.12 C
2002	12.4 C	+0.18 C
2003	13.1 C	+0.85 C
2004	13.1 C	+0.92 C
2005	12.5 C	+0.24 C
2006	12.8 C	+0.53 C
2007	12.1 C	-0.10 C
2008	12.0 C	-0.27 C
2009	12.4 C	+0.20 C
2010	12.3 C	+0.04 C
2011	11.6 C	-0.59 C
2012	12.5 C	+0.28 C
2013	12.3 C	+0.09 C
2014	13.4 C	+1.14 C
2015	14.1 C	+1.86 C
2016	13.6 C	+1.42 C
2017	12.3 C	+0.07 C
2018	13.6 C	+1.34 C
2019	12.7 C	+0.44 C
2020	13.3 C	+1.04 C
2021	13.6 C	+1.39 C
2022	13.2 C	+1.00 C
2023	13.7 C	+1.44 C
2024	13.8 C	+1.53 C
2025	13.8 C	+1.58 C

The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1939 to 2025. In Fahrenheit: 0.4 F (0.3 to 0.5) per decade. The slope is a straight line fitted to 87 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Portland Intl AP
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.2 C (0.1 to 0.3) per decade	0.4 F (0.3 to 0.5) per decade	1939 to 2025	87	Rise
Mean daily maximum	0.2 C (0.1 to 0.2) per decade	0.3 F (0.2 to 0.4) per decade	1939 to 2025	87	Rise
Mean daily minimum	0.2 C (0.2 to 0.3) per decade	0.4 F (0.3 to 0.5) per decade	1939 to 2025	87	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

1938 to 2026

Yearly extremes at Portland Intl AP: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	46.7 C (116.1 F)	2021	37.8 C (100.0 F)	89
Coldest night (TNn)	-19.4 C (-2.9 F)	1950	-7.2 C (19.0 F)	89
Wettest day (Rx1day)	68.3 mm (2.7 in)	1996	43.7 mm (1.7 in)	89
Wettest five days (Rx5day)	179.1 mm (7.1 in)	1996	95.2 mm (3.7 in)	89
Longest dry spell (CDD)	94 days	2021	38 days	89

Hottest day (TXx)

The hottest day of the year at Portland Intl AP, 1938 to 2026. The record is 46.7 C (116.1 F) in 2021, marked on the chart; the median year is 37.8 C (100.0 F).

Hottest day (TXx) at Portland Intl AP by year
Year	Hottest day (TXx)
1938	38.3 C (100.9 F)
1939	37.8 C (100.0 F)
1940	37.2 C (99.0 F)
1941	39.4 C (102.9 F)
1942	40.6 C (105.1 F)
1943	33.9 C (93.0 F)
1944	40.0 C (104.0 F)
1945	37.8 C (100.0 F)
1946	38.9 C (102.0 F)
1947	33.3 C (91.9 F)
1948	34.4 C (93.9 F)
1949	33.9 C (93.0 F)
1950	35.0 C (95.0 F)
1951	36.1 C (97.0 F)
1952	37.2 C (99.0 F)
1953	35.0 C (95.0 F)
1954	30.0 C (86.0 F)
1955	36.7 C (98.1 F)
1956	38.9 C (102.0 F)
1957	33.3 C (91.9 F)
1958	38.9 C (102.0 F)
1959	36.7 C (98.1 F)
1960	37.8 C (100.0 F)
1961	40.0 C (104.0 F)
1962	33.9 C (93.0 F)
1963	33.9 C (93.0 F)
1964	34.4 C (93.9 F)
1965	41.7 C (107.1 F)
1966	35.0 C (95.0 F)
1967	38.9 C (102.0 F)
1968	37.2 C (99.0 F)
1969	36.1 C (97.0 F)
1970	38.9 C (102.0 F)
1971	38.3 C (100.9 F)
1972	40.0 C (104.0 F)
1973	37.2 C (99.0 F)
1974	35.6 C (96.1 F)
1975	35.0 C (95.0 F)
1976	33.3 C (91.9 F)
1977	40.6 C (105.1 F)
1978	38.3 C (100.9 F)
1979	40.0 C (104.0 F)
1980	38.3 C (100.9 F)
1981	41.7 C (107.1 F)
1982	37.8 C (100.0 F)
1983	37.8 C (100.0 F)
1984	37.8 C (100.0 F)
1985	38.3 C (100.9 F)
1986	37.8 C (100.0 F)
1987	38.9 C (102.0 F)
1988	40.6 C (105.1 F)
1989	33.9 C (93.0 F)
1990	38.3 C (100.9 F)
1991	37.8 C (100.0 F)
1992	38.3 C (100.9 F)
1993	36.1 C (97.0 F)
1994	39.4 C (102.9 F)
1995	37.2 C (99.0 F)
1996	37.8 C (100.0 F)
1997	34.4 C (93.9 F)
1998	38.3 C (100.9 F)
1999	33.9 C (93.0 F)
2000	36.7 C (98.1 F)
2001	36.7 C (98.1 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	38.9 C (102.0 F)
2008	38.9 C (102.0 F)
2009	41.1 C (106.0 F)
2010	36.7 C (98.1 F)
2011	35.6 C (96.1 F)
2012	38.9 C (102.0 F)
2013	36.1 C (97.0 F)
2014	37.2 C (99.0 F)
2015	39.4 C (102.9 F)
2016	37.8 C (100.0 F)
2017	40.6 C (105.1 F)
2018	37.8 C (100.0 F)
2019	36.7 C (98.1 F)
2020	37.8 C (100.0 F)
2021	46.7 C (116.1 F)
2022	38.9 C (102.0 F)
2023	42.2 C (108.0 F)
2024	40.0 C (104.0 F)
2025	38.9 C (102.0 F)
2026	37.8 C (100.0 F)

Coldest night (TNn)

The coldest night of the year at Portland Intl AP, 1938 to 2026. The record is -19.4 C (-2.9 F) in 1950, marked on the chart; the median year is -7.2 C (19.0 F).

Coldest night (TNn) at Portland Intl AP by year
Year	Coldest night (TNn)
1938	-2.8 C (27.0 F)
1939	-5.0 C (23.0 F)
1940	-3.9 C (25.0 F)
1941	-4.4 C (24.1 F)
1942	-7.2 C (19.0 F)
1943	-16.1 C (3.0 F)
1944	-4.4 C (24.1 F)
1945	-5.6 C (21.9 F)
1946	-6.7 C (19.9 F)
1947	-7.8 C (18.0 F)
1948	-5.6 C (21.9 F)
1949	-12.8 C (9.0 F)
1950	-19.4 C (-2.9 F)
1951	-8.9 C (16.0 F)
1952	-7.8 C (18.0 F)
1953	-2.8 C (27.0 F)
1954	-7.2 C (19.0 F)
1955	-10.6 C (12.9 F)
1956	-10.6 C (12.9 F)
1957	-14.4 C (6.1 F)
1958	-5.0 C (23.0 F)
1959	-8.9 C (16.0 F)
1960	-7.2 C (19.0 F)
1961	-6.1 C (21.0 F)
1962	-12.8 C (9.0 F)
1963	-11.7 C (10.9 F)
1964	-14.4 C (6.1 F)
1965	-7.2 C (19.0 F)
1966	-4.4 C (24.1 F)
1967	-10.6 C (12.9 F)
1968	-13.3 C (8.1 F)
1969	-8.9 C (16.0 F)
1970	-5.0 C (23.0 F)
1971	-6.7 C (19.9 F)
1972	-13.3 C (8.1 F)
1973	-5.6 C (21.9 F)
1974	-11.1 C (12.0 F)
1975	-3.3 C (26.1 F)
1976	-5.6 C (21.9 F)
1977	-8.3 C (17.1 F)
1978	-10.6 C (12.9 F)
1979	-10.0 C (14.0 F)
1980	-10.6 C (12.9 F)
1981	-3.9 C (25.0 F)
1982	-10.0 C (14.0 F)
1983	-11.1 C (12.0 F)
1984	-7.8 C (18.0 F)
1985	-10.6 C (12.9 F)
1986	-3.9 C (25.0 F)
1987	-5.0 C (23.0 F)
1988	-5.6 C (21.9 F)
1989	-12.8 C (9.0 F)
1990	-11.1 C (12.0 F)
1991	-6.7 C (19.9 F)
1992	-2.8 C (27.0 F)
1993	-7.8 C (18.0 F)
1994	-5.6 C (21.9 F)
1995	-8.9 C (16.0 F)
1996	-10.0 C (14.0 F)
1997	-3.3 C (26.1 F)
1998	-11.7 C (10.9 F)
1999	-3.3 C (26.1 F)
2000	-4.4 C (24.1 F)
2001	-3.3 C (26.1 F)
2002	-3.3 C (26.1 F)
2003	-3.3 C (26.1 F)
2004	-7.8 C (18.0 F)
2005	-4.4 C (24.1 F)
2006	-5.6 C (21.9 F)
2007	-7.2 C (19.0 F)
2008	-6.7 C (19.9 F)
2009	-11.1 C (12.0 F)
2010	-7.8 C (18.0 F)
2011	-7.8 C (18.0 F)
2012	-3.3 C (26.1 F)
2013	-11.0 C (12.2 F)
2014	-7.1 C (19.2 F)
2015	-4.3 C (24.3 F)
2016	-3.8 C (25.2 F)
2017	-11.6 C (11.1 F)
2018	-4.9 C (23.2 F)
2019	-4.9 C (23.2 F)
2020	-2.7 C (27.1 F)
2021	-4.3 C (24.3 F)
2022	-6.6 C (20.1 F)
2023	-7.7 C (18.1 F)
2024	-9.3 C (15.3 F)
2025	-4.3 C (24.3 F)
2026	-5.6 C (21.9 F)

Wettest day (Rx1day)

The wettest day of the year at Portland Intl AP, 1938 to 2026. The record is 68.3 mm (2.7 in) in 1996, marked on the chart; the median year is 43.7 mm (1.7 in).

Wettest day (Rx1day) at Portland Intl AP by year
Year	Wettest day (Rx1day)
1938	30.2 mm (1.2 in)
1939	31.5 mm (1.2 in)
1940	46.5 mm (1.8 in)
1941	43.7 mm (1.7 in)
1942	55.1 mm (2.2 in)
1943	40.9 mm (1.6 in)
1944	35.1 mm (1.4 in)
1945	57.4 mm (2.3 in)
1946	50.5 mm (2.0 in)
1947	33.5 mm (1.3 in)
1948	63.0 mm (2.5 in)
1949	45.2 mm (1.8 in)
1950	61.7 mm (2.4 in)
1951	33.3 mm (1.3 in)
1952	28.2 mm (1.1 in)
1953	43.7 mm (1.7 in)
1954	44.5 mm (1.8 in)
1955	50.5 mm (2.0 in)
1956	49.0 mm (1.9 in)
1957	33.0 mm (1.3 in)
1958	43.2 mm (1.7 in)
1959	41.9 mm (1.6 in)
1960	58.7 mm (2.3 in)
1961	43.7 mm (1.7 in)
1962	39.9 mm (1.6 in)
1963	32.3 mm (1.3 in)
1964	45.7 mm (1.8 in)
1965	45.5 mm (1.8 in)
1966	39.6 mm (1.6 in)
1967	32.5 mm (1.3 in)
1968	37.3 mm (1.5 in)
1969	56.6 mm (2.2 in)
1970	51.6 mm (2.0 in)
1971	37.6 mm (1.5 in)
1972	43.9 mm (1.7 in)
1973	61.5 mm (2.4 in)
1974	50.3 mm (2.0 in)
1975	38.9 mm (1.5 in)
1976	33.5 mm (1.3 in)
1977	46.7 mm (1.8 in)
1978	27.4 mm (1.1 in)
1979	35.6 mm (1.4 in)
1980	52.8 mm (2.1 in)
1981	45.7 mm (1.8 in)
1982	46.7 mm (1.8 in)
1983	47.8 mm (1.9 in)
1984	50.0 mm (2.0 in)
1985	34.5 mm (1.4 in)
1986	37.6 mm (1.5 in)
1987	59.2 mm (2.3 in)
1988	33.8 mm (1.3 in)
1989	27.7 mm (1.1 in)
1990	30.5 mm (1.2 in)
1991	35.3 mm (1.4 in)
1992	39.9 mm (1.6 in)
1993	27.4 mm (1.1 in)
1994	62.0 mm (2.4 in)
1995	51.1 mm (2.0 in)
1996	68.3 mm (2.7 in)
1997	44.7 mm (1.8 in)
1998	53.6 mm (2.1 in)
1999	32.5 mm (1.3 in)
2000	25.1 mm (1.0 in)
2001	35.8 mm (1.4 in)
2002	38.1 mm (1.5 in)
2003	52.1 mm (2.1 in)
2004	22.1 mm (0.9 in)
2005	42.7 mm (1.7 in)
2006	64.3 mm (2.5 in)
2007	41.9 mm (1.6 in)
2008	24.4 mm (1.0 in)
2009	63.2 mm (2.5 in)
2010	39.4 mm (1.6 in)
2011	59.7 mm (2.4 in)
2012	48.5 mm (1.9 in)
2013	36.6 mm (1.4 in)
2014	47.8 mm (1.9 in)
2015	67.8 mm (2.7 in)
2016	50.5 mm (2.0 in)
2017	55.6 mm (2.2 in)
2018	34.5 mm (1.4 in)
2019	28.2 mm (1.1 in)
2020	36.3 mm (1.4 in)
2021	49.3 mm (1.9 in)
2022	53.8 mm (2.1 in)
2023	42.7 mm (1.7 in)
2024	28.2 mm (1.1 in)
2025	53.3 mm (2.1 in)
2026	43.9 mm (1.7 in)

Wettest five days (Rx5day)

The wettest five days of the year at Portland Intl AP, 1938 to 2026. The record is 179.1 mm (7.1 in) in 1996, marked on the chart; the median year is 95.2 mm (3.7 in).

Wettest five days (Rx5day) at Portland Intl AP by year
Year	Wettest five days (Rx5day)
1938	79.1 mm (3.1 in)
1939	79.5 mm (3.1 in)
1940	106.6 mm (4.2 in)
1941	121.5 mm (4.8 in)
1942	124.1 mm (4.9 in)
1943	115.0 mm (4.5 in)
1944	75.7 mm (3.0 in)
1945	100.9 mm (4.0 in)
1946	118.1 mm (4.6 in)
1947	111.7 mm (4.4 in)
1948	96.6 mm (3.8 in)
1949	101.3 mm (4.0 in)
1950	107.1 mm (4.2 in)
1951	88.7 mm (3.5 in)
1952	77.0 mm (3.0 in)
1953	105.1 mm (4.1 in)
1954	70.1 mm (2.8 in)
1955	109.7 mm (4.3 in)
1956	123.3 mm (4.9 in)
1957	85.4 mm (3.4 in)
1958	59.9 mm (2.4 in)
1959	89.7 mm (3.5 in)
1960	123.0 mm (4.8 in)
1961	91.0 mm (3.6 in)
1962	61.4 mm (2.4 in)
1963	75.0 mm (3.0 in)
1964	134.2 mm (5.3 in)
1965	109.6 mm (4.3 in)
1966	90.3 mm (3.6 in)
1967	67.0 mm (2.6 in)
1968	102.8 mm (4.0 in)
1969	78.9 mm (3.1 in)
1970	119.6 mm (4.7 in)
1971	76.4 mm (3.0 in)
1972	99.5 mm (3.9 in)
1973	110.0 mm (4.3 in)
1974	141.2 mm (5.6 in)
1975	79.3 mm (3.1 in)
1976	72.6 mm (2.9 in)
1977	117.8 mm (4.6 in)
1978	56.9 mm (2.2 in)
1979	62.4 mm (2.5 in)
1980	118.3 mm (4.7 in)
1981	82.8 mm (3.3 in)
1982	87.7 mm (3.5 in)
1983	82.2 mm (3.2 in)
1984	83.8 mm (3.3 in)
1985	52.5 mm (2.1 in)
1986	71.0 mm (2.8 in)
1987	129.8 mm (5.1 in)
1988	72.7 mm (2.9 in)
1989	56.2 mm (2.2 in)
1990	98.3 mm (3.9 in)
1991	69.1 mm (2.7 in)
1992	76.6 mm (3.0 in)
1993	75.0 mm (3.0 in)
1994	141.8 mm (5.6 in)
1995	105.7 mm (4.2 in)
1996	179.1 mm (7.1 in)
1997	113.5 mm (4.5 in)
1998	120.1 mm (4.7 in)
1999	81.3 mm (3.2 in)
2000	55.6 mm (2.2 in)
2001	95.2 mm (3.7 in)
2002	73.7 mm (2.9 in)
2003	91.2 mm (3.6 in)
2004	53.4 mm (2.1 in)
2005	96.8 mm (3.8 in)
2006	142.7 mm (5.6 in)
2007	97.0 mm (3.8 in)
2008	45.3 mm (1.8 in)
2009	105.2 mm (4.1 in)
2010	96.7 mm (3.8 in)
2011	97.4 mm (3.8 in)
2012	105.8 mm (4.2 in)
2013	97.9 mm (3.9 in)
2014	76.0 mm (3.0 in)
2015	155.8 mm (6.1 in)
2016	93.5 mm (3.7 in)
2017	108.7 mm (4.3 in)
2018	59.7 mm (2.4 in)
2019	57.8 mm (2.3 in)
2020	67.6 mm (2.7 in)
2021	83.3 mm (3.3 in)
2022	120.9 mm (4.8 in)
2023	126.8 mm (5.0 in)
2024	71.4 mm (2.8 in)
2025	98.8 mm (3.9 in)
2026	105.9 mm (4.2 in)

Longest dry spell (CDD)

The longest dry spell of the year at Portland Intl AP, 1938 to 2026. The record is 94 days in 2021, marked on the chart; the median year is 38 days.

Longest dry spell (CDD) at Portland Intl AP by year
Year	Longest dry spell (CDD)
1938	47 days
1939	40 days
1940	50 days
1941	37 days
1942	35 days
1943	28 days
1944	50 days
1945	37 days
1946	44 days
1947	20 days
1948	21 days
1949	27 days
1950	31 days
1951	63 days
1952	55 days
1953	37 days
1954	29 days
1955	47 days
1956	42 days
1957	46 days
1958	70 days
1959	38 days
1960	55 days
1961	40 days
1962	31 days
1963	24 days
1964	12 days
1965	45 days
1966	53 days
1967	71 days
1968	24 days
1969	39 days
1970	39 days
1971	41 days
1972	34 days
1973	24 days
1974	26 days
1975	32 days
1976	20 days
1977	28 days
1978	19 days
1979	35 days
1980	53 days
1981	52 days
1982	17 days
1983	30 days
1984	62 days
1985	52 days
1986	45 days
1987	35 days
1988	34 days
1989	20 days
1990	42 days
1991	45 days
1992	42 days
1993	43 days
1994	36 days
1995	27 days
1996	28 days
1997	40 days
1998	49 days
1999	23 days
2000	26 days
2001	32 days
2002	42 days
2003	44 days
2004	37 days
2005	37 days
2006	48 days
2007	31 days
2008	36 days
2009	29 days
2010	59 days
2011	35 days
2012	51 days
2013	35 days
2014	56 days
2015	52 days
2016	23 days
2017	58 days
2018	70 days
2019	24 days
2020	46 days
2021	94 days
2022	83 days
2023	72 days
2024	41 days
2025	28 days
2026	37 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

87 years with a frost

Across 87 years with a frost, the median last spring frost at Portland Intl AP falls on 24 March and the median first autumn frost on 10 November, which leaves a median of 233 days between them.

In 1996 to 2025 the median growing season was 247 days. That is 24 days more than in 1939 to 1968.

Fitted over all years, the growing season changes by +4.1 days per decade at this station.

Frost dates and growing season at Portland Intl AP
Measure	Median, all years	Earliest period (1939 to 1968)	Recent period (1996 to 2025)	Recent against earliest	Fitted trend
Last spring frost	24 March	3 April	18 March	16 days earlier	-2.5 days per decade
First autumn frost	10 November	7 November	16 November	9 days later	+1.6 days per decade
Growing days	233 days	223 days	247 days	24 days more	+4.1 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

87 years, 1939 to 2025

A day with at least 43.2 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 71.6 mm (2.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Portland Intl AP: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	43.2 mm (1.7 in)
5 years	53.2 mm (2.1 in)
10 years	58.7 mm (2.3 in)
25 years	64.6 mm (2.5 in)
50 years	68.4 mm (2.7 in)
100 years	71.6 mm (2.8 in)	Longer than the 87 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, 87 years of values from 1939 to 2025.

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: 68.3 mm (2.7 in) in 1996; 67.8 mm (2.7 in) in 2015; 64.3 mm (2.5 in) in 2006.

Station Changes

1 suspected

One change was suspected in the annual mean temperature of Portland Intl AP, at 1970. Each is measured against neighbouring stations.

Relative to 5 neighbouring stations, the station's annual mean temperature from 1970 ran 0.3 C (0.5 F) higher than in the years before (possible change).

Suspected changes in the annual mean temperature at Portland Intl AP, against neighbouring stations
Year	Shift (C)	Shift (F)	Strength	Neighbours
1970	+0.3	+0.5	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.

Climate Twins

2011 to 2025 against 1961 to 1990

Over 2011 to 2025, Portland Intl AP had a mean temperature of 13.2 C (55.7 F) and 944.0 mm (37.2 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Montelimar (France, 8,730 km away), Covelo (United States, 645 km away) and Placerville (United States, 781 km away).

Climate twins of Portland Intl AP: stations whose 1961 to 1990 climate is closest to its 2011 to 2025 climate
Twin station	Country	Distance away	Mean temperature, 1961-1990	Rain a year, 1961-1990	Climate difference
Montelimar	France	8,730 km (5,425 mi)	13.0 C (55.3 F)	913.3 mm (36.0 in)	0.56
Covelo	United States	645 km (401 mi)	12.9 C (55.2 F)	1,024.2 mm (40.3 in)	0.68
Placerville	United States	781 km (485 mi)	13.6 C (56.5 F)	901.9 mm (35.5 in)	0.77

Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.

Download the Data

Data for Portland Intl AP standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Portland Intl AP 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 2026-10-12. Last revised 12 October 2026 (2026-10-12).