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Data as of 2026-10-17
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Built 2026-10-19 (19 October 2026)

Portland Aero Threshold Days by Year (ASN00090162)

7 fixed thresholds counted per year at Portland Aero (ASN00090162): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Portland Aero Thresholds

  • Portland Aero: days with a maximum temperature at or above 30 C (86 F) in 10 years, most in 1974 with 12.
  • Portland Aero: days with a maximum temperature at or above 90 F (32.2 C) in 10 years, most in 1974 with 4.
  • Portland Aero: days with 10 mm (0.39 in) or more of precipitation in 8 years, most in 1974 with 26.
  • Portland Aero: days with 25 mm (0.98 in) or more of precipitation in 8 years, most in 1975 with 4.
  • 7 fixed thresholds have at least one qualifying day at Portland Aero.
10 years with a qualifying day
Days at or above 30 C (86 F) per year at Portland Aero Days per year at Portland Aero with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 12 in 1974. 0510151974: 121975: 41976: 61977: 61978: 81979: 71980: 81981: 62025: 62026: 31974197519761977197819791980198120252026
Days per year at Portland Aero with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 12 in 1974.
Days at or above 30 C (86 F) per year at Portland Aero
YearDaysDecade average
1974127.2
197547.2
197667.2
197767.2
197887.2
197977.2
198087
198167
202564.5
202634.5
First to last qualifying date each year at Portland Aero For each year, a bar from the first to the last day at Portland Aero meeting 30 C (86 F). 1974: 9 January 1974 to 23 December 19741975: 1 March 1975 to 2 December 19751976: 4 January 1976 to 31 December 19761977: 11 February 1977 to 31 December 19771978: 14 January 1978 to 2 December 19781979: 4 January 1979 to 29 December 19791980: 17 January 1980 to 11 November 19801981: 8 January 1981 to 31 December 19812025: 5 January 2025 to 18 December 20252026: 7 January 2026 to 16 February 202619741976197819802025JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Portland Aero meeting 30 C (86 F).
First to last qualifying date each year at Portland Aero
YearFirst dateLast date
19741974-01-091974-12-23
19751975-03-011975-12-02
19761976-01-041976-12-31
19771977-02-111977-12-31
19781978-01-141978-12-02
19791979-01-041979-12-29
19801980-01-171980-11-11
19811981-01-081981-12-31
20252025-01-052025-12-18
20262026-01-072026-02-16

Every Fixed Threshold

Fixed thresholds at Portland Aero
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days101219743
35 C (95 F): Days5219761
90 F (32.2 C): Days10419741
20 C (68 F): Tropical nights (min4219742
10 mm (0.39 in): Days with 10 mm or more rain826197425
25 mm (0.98 in): Days with 25 mm or more rain8419753
50 mm (1.97 in): Days with 50 mm or more rain3119751

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1974.

Download the Data

  • Data for Portland Aero 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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2026-10-17).