United States · 1991–2020

Best time to visit
Summit.

September leads for comfortable weather in Summit: typically 24.7°C by day, 7.8°C at night, with 45 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24.7°C

Typical low7.8°C

Rain in September45 mm

Comfort

September

September · June · July

81climate match

Beach

August

August · July · September

65climate match

Outdoors

June

June · May · September

84climate match

The weakest month is January, scoring 5 against September’s 81 — days reach only 7.8°C, 16° below the 24°C the score treats as ideal, and 280 mm of rain falls.

Month by month

The whole year,
without the guesswork.

The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.

Jan

57.8° / -0.1°

Feb

510.1° / 0.2°

Mar

512.9° / 1.4°

Apr

2615.7° / 2.9°

May

5919.9° / 5.7°

Jun

8022.7° / 7.8°

Jul

7927.4° / 9.9°

Aug

7827.8° / 9.7°

Sep

8124.7° / 7.8°

Oct

4017.8° / 4.1°

Nov

510.9° / 1.5°

Dec

57.3° / -0.1°

Monthly climate evidence for Summit — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 43 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	7.8°C	-0.1°C	280 mm	17.9	10.1°C	9 h 10	5	Strong coverage
February	10.1°C	0.2°C	220 mm	15.2	10.0°C	10 h 21	5	Strong coverage
March	12.9°C	1.4°C	209 mm	17.8	10.1°C	11 h 46	5	Strong coverage
April	15.7°C	2.9°C	136 mm	14.8	10.7°C	13 h 24	26	Strong coverage
May	19.9°C	5.7°C	71 mm	9.9	12.0°C	14 h 47	59	Strong coverage
June	22.7°C	7.8°C	37 mm	6.1	13.3°C	15 h 33	80	Strong coverage
July	27.4°C	9.9°C	8 mm	1.7	13.4°C	15 h 15	79	Strong coverage
August	27.8°C	9.7°C	11 mm	2	13.2°C	14 h 03	78	Strong coverage
September	24.7°C	7.8°C	45 mm	5	13.3°C	12 h 28	81	Strong coverage
October	17.8°C	4.1°C	125 mm	11	12.5°C	10 h 53	40	Strong coverage
November	10.9°C	1.5°C	272 mm	17.5	11.6°C	9 h 31	5	Strong coverage
December	7.3°C	-0.1°C	344 mm	18.6	10.7°C	8 h 50	5	Strong coverage

What has changed

Summit runs +1.8°C
on the 1961–1990 baseline.

Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.

Jan

+0.7

Feb

+0.3

Mar

+0.9

Apr

+1.8

May

+2.6

Jun

+2.4

Jul

+3.6

Aug

+3.8

Sep

+2.7

Oct

+1.5

Nov

+0.6

Dec

+1.0

September daytime highs, 2011–2025. Last recorded: 27.4°C.

Records at CORVALLIS WATER BUREAU, 1963–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	17.8°C29 Jan 2024	-15.6°C1 Jan 1979	112 mm15 Jan 1974	685 mm2006 · driest 11 mm in 1985	62
February	22.2°C28 Feb 1968	-16.7°C4 Feb 1989	133 mm6 Feb 1996	622 mm1999 · driest 19 mm in 2005	62
March	25.6°C27 Mar 2025	-9.4°C4 Mar 2019	110 mm9 Mar 1966	478 mm2012 · driest 22 mm in 1965	62
April	31.1°C19 Apr 2016	-4.4°C4 Apr 2009	95 mm8 Apr 2019	366 mm2019 · driest 25 mm in 1977	62
May	35.0°C17 May 2008	-2.8°C7 May 2017	53 mm14 May 2022	191 mm2022 · driest 6 mm in 2018	63
June	43.3°C28 Jun 2021	-0.6°C6 Jun 2020	67 mm7 Jun 1985	107 mm2010 · driest 3 mm in 2023	64
July	41.1°C31 Jul 2015	2.8°C19 Jul 2017	25 mm18 Jul 1996	41 mm1974 · driest 0 mm in 2020	63
August	41.7°C8 Aug 1972	1.7°C22 Aug 1973	31 mm25 Aug 1968	134 mm1968 · driest 0 mm in 1981	62
September	38.3°C3 Sep 2017	-2.8°C28 Sep 2019	96 mm30 Sep 2013	259 mm2013 · driest 0 mm in 2012	63
October	31.7°C7 Oct 2014	-9.4°C29 Oct 2019	115 mm14 Oct 2016	534 mm2016 · driest 4 mm in 1974	63
November	21.1°C5 Nov 2012	-11.7°C24 Nov 1985	160 mm19 Nov 1996	711 mm1973 · driest 46 mm in 1993	61
December	16.1°C16 Dec 2025	-16.7°C10 Dec 1972	140 mm28 Dec 1998	702 mm1996 · driest 61 mm in 1976	62

Typical days per month at CORVALLIS WATER BUREAU, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	17	9	<1
February	0	0	16	7	<1
March	0	0	12	7	<1
April	1	<1	6	4	<1
May	6	1	1	2	0
June	10	3	<1	<1	0
July	22	10	0	<1	0
August	23	10	0	<1	0
September	14	5	<1	1	0
October	2	<1	4	4	0
November	0	0	12	9	<1
December	0	0	15	11	<1

The best month has moved. On the 1961–1990 numbers the strongest month here was July (scoring 86); on 2011–2025 it is June (84). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in CORVALLIS WATER BUREAU’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	0%	56%	31%	72%	5.6–8.9°C
February	<1%	55%	26%	72%	8.0–11.9°C
March	5%	54%	23%	70%	10.7–15.0°C
April	17%	43%	13%	55%	13.5–17.7°C
May	40%	30%	6%	33%	16.8–21.9°C
June	63%	19%	4%	18%	20.3–25.5°C
July	90%	6%	<1%	3%	24.6–30.1°C
August	90%	8%	2%	7%	24.8–30.5°C
September	74%	16%	5%	19%	21.7–27.0°C
October	28%	33%	13%	46%	15.9–19.9°C
November	<1%	55%	28%	73%	9.0–12.3°C
December	0%	58%	32%	74%	5.6–9.1°C

A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.

1964Each stripe is one year’s mean temperature against the 55-year average. Warmest: 2021. Coolest: 2009.2023

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5755155
NOAA station: USC00351877 · CORVALLIS WATER BUREAU
Station distance: 17.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 28 usable years
Daylight: Calculated from latitude 44.64°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 43 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
Important limit: Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.

These places read the same station, so their numbers are identical — distance from CORVALLIS WATER BUREAU is what differs

Philomath→Blodgett→Alder→Burnt Woods→Flynn→Harris→

Or put two places side by side: Summit vs Philomath

Best time to visitSummit.