United States · 1991–2020

Best time to visit
O'Neil Corners.

September leads for comfortable weather in O'Neil Corners: typically 25.1°C by day, 9.8°C at night, with 34 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25.1°C

Typical low9.8°C

Rain in September34 mm

Comfort

September

September · June · July

86climate match

Beach

July

July · August · September

73climate match

Outdoors

June

June · May · September

85climate match

The weakest month is January, scoring 5 against September’s 86 — days reach only 8.9°C, 15° below the 24°C the score treats as ideal.

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

58.9° / 2.2°

Feb

1511.3° / 2.1°

Mar

2413.8° / 3.5°

Apr

3916° / 4.9°

May

6320° / 8.1°

Jun

8523° / 10.4°

Jul

8427.6° / 12.7°

Aug

8327.7° / 12.3°

Sep

8625.1° / 9.8°

Oct

4817.9° / 6.5°

Nov

811.5° / 3.5°

Dec

57.8° / 1.2°

Monthly climate evidence for O'Neil Corners — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	8.9°C	2.2°C	160 mm	16.2	9 h 06	5	Good coverage
February	11.3°C	2.1°C	117 mm	12.6	10 h 19	15	Good coverage
March	13.8°C	3.5°C	115 mm	14.6	11 h 46	24	Good coverage
April	16°C	4.9°C	84 mm	13.6	13 h 26	39	Good coverage
May	20°C	8.1°C	66 mm	10.6	14 h 51	63	Good coverage
June	23°C	10.4°C	40 mm	6.5	15 h 38	85	Good coverage
July	27.6°C	12.7°C	13 mm	2.4	15 h 19	84	Good coverage
August	27.7°C	12.3°C	15 mm	2.6	14 h 05	83	Good coverage
September	25.1°C	9.8°C	34 mm	4.4	12 h 28	86	Good coverage
October	17.9°C	6.5°C	102 mm	10.7	10 h 52	48	Good coverage
November	11.5°C	3.5°C	169 mm	15.8	9 h 27	8	Good coverage
December	7.8°C	1.2°C	176 mm	15.8	8 h 45	5	Good coverage

Records at N WILLAMETTE EXP STN, 1963–2007
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	18.3°C18 Jan 2005	-13.3°C10 Jan 1974	51 mm31 Jan 1997	348 mm2006 · driest 12 mm in 1985	44
February	22.2°C29 Feb 1968	-13.3°C3 Feb 1989	69 mm6 Feb 1996	298 mm1996 · driest 7 mm in 1993	44
March	25.6°C28 Mar 1994	-6.7°C1 Mar 1971	51 mm4 Mar 2007	218 mm1997 · driest 28 mm in 1965	45
April	30.0°C30 Apr 1998	-7.2°C10 Apr 2001	107 mm10 Apr 1982	228 mm1982 · driest 16 mm in 1977	44
May	38.3°C29 May 1983	-1.7°C2 May 1964	45 mm17 May 1991	142 mm1998 · driest 5 mm in 1992	45
June	40.0°C23 Jun 1992	1.1°C1 Jun 1966	40 mm21 Jun 1984	136 mm1984 · driest 6 mm in 1970	45
July	40.0°C21 Jul 2006	5.0°C13 Jul 1970	45 mm18 Jul 1987	68 mm1983 · driest 0 mm in 1967	45
August	40.6°C13 Aug 1977	2.8°C29 Aug 1965	36 mm29 Aug 1983	106 mm1968 · driest 0 mm in 1967	45
September	40.6°C3 Sep 1988	-1.1°C27 Sep 1972	52 mm30 Sep 2005	92 mm1982 · driest 0 mm in 1975	43
October	35.0°C2 Oct 1988	-3.9°C28 Oct 1971	122 mm27 Oct 1994	176 mm1994 · driest 5 mm in 1988	43
November	22.2°C2 Nov 1969	-10.0°C24 Nov 1985	94 mm19 Nov 1996	332 mm2006 · driest 35 mm in 1993	43
December	19.4°C10 Dec 1993	-19.4°C24 Dec 1998	58 mm22 Dec 1964	399 mm1996 · driest 14 mm in 1998	43

Typical days per month at N WILLAMETTE EXP STN, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	10	6
February	0	0	8	4
March	<1	0	4	4
April	1	<1	2	2
May	6	2	<1	2
June	10	4	0	1
July	22	10	0	<1
August	23	11	0	<1
September	15	6	0	<1
October	2	<1	<1	4
November	0	0	7	6
December	0	0	12	7

How often, not how much — every day in N WILLAMETTE EXP STN’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%	52%	18%	68%	6.3–10.2°C
February	<1%	47%	13%	62%	9.1–13.2°C
March	7%	48%	10%	65%	11.3–15.4°C
April	17%	43%	6%	57%	14.0–17.7°C
May	37%	31%	5%	37%	17.3–21.6°C
June	62%	22%	4%	23%	20.6–25.0°C
July	88%	9%	1%	6%	24.6–29.1°C
August	88%	11%	2%	11%	24.8–29.2°C
September	71%	20%	4%	22%	21.3–26.9°C
October	29%	34%	10%	46%	16.1–19.9°C
November	<1%	53%	19%	75%	9.6–13.0°C
December	0%	53%	21%	69%	6.1–9.8°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 40-year average. Warmest: 1992. Coolest: 1964.2006

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5743680
NOAA station: USC00356151 · N WILLAMETTE EXP STN
Station distance: 7.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 15 usable years
Daylight: Calculated from latitude 45.27°, mid-month, sunrise to sunset including refraction. Not a station measurement.
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 N WILLAMETTE EXP STN is what differs

Wilsonville→Canby→Charbonneau→Hoodview→Mulloy→Norwood→

Or put two places side by side: O'Neil Corners vs Wilsonville

Best time to visitO'Neil Corners.