United States · 1991–2020

Best time to visit
Holley.

September leads for comfortable weather in Holley: typically 25.1°C by day, 8.3°C at night, with 50 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25.1°C

Typical low8.3°C

Rain in September50 mm

Comfort

September

September · June · July

80climate match

Beach

July

July · August · September

68climate match

Outdoors

June

June · September · May

78climate match

The weakest month is January, scoring 5 against September’s 80 — days reach only 9.1°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

59.1° / 1.3°

Feb

811.1° / 1.5°

Mar

1313.5° / 2.7°

Apr

2916.1° / 4.2°

May

5619.9° / 6.7°

Jun

7823.1° / 8.7°

Jul

7828.1° / 10.5°

Aug

7628.6° / 10.2°

Sep

8025.1° / 8.3°

Oct

4518.3° / 5.6°

Nov

512.1° / 3.1°

Dec

58.5° / 1.3°

Monthly climate evidence for Holley — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	9.1°C	1.3°C	182 mm	17	9 h 11	5	Strong coverage
February	11.1°C	1.5°C	141 mm	14.7	10 h 22	8	Strong coverage
March	13.5°C	2.7°C	161 mm	17	11 h 46	13	Strong coverage
April	16.1°C	4.2°C	136 mm	16.1	13 h 23	29	Strong coverage
May	19.9°C	6.7°C	96 mm	11.2	14 h 45	56	Strong coverage
June	23.1°C	8.7°C	63 mm	7.8	15 h 30	78	Strong coverage
July	28.1°C	10.5°C	14 mm	2.2	15 h 13	78	Strong coverage
August	28.6°C	10.2°C	15 mm	2.3	14 h 02	76	Strong coverage
September	25.1°C	8.3°C	50 mm	5.7	12 h 27	80	Strong coverage
October	18.3°C	5.6°C	118 mm	11.3	10 h 54	45	Strong coverage
November	12.1°C	3.1°C	194 mm	16.6	9 h 32	5	Strong coverage
December	8.5°C	1.3°C	213 mm	17.6	8 h 52	5	Strong coverage

What has changed

Holley runs +0.9°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

+0.4

Feb

-0.6

Mar

-0.2

Apr

+0.8

May

+1.2

Jun

+1.6

Jul

+2.4

Aug

+2.7

Sep

+1.7

Oct

+0.3

Nov

+0.4

Dec

+0.1

September daytime highs, 2011–2025. Last recorded: 25.7°C.

Records at FOSTER DAM, 1969–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	19.4°C19 Jan 1986	-17.8°C1 Jan 1979	72 mm8 Jan 1976	368 mm2006 · driest 19 mm in 1985	57
February	21.7°C25 Feb 1992	-16.7°C5 Feb 1989	86 mm13 Feb 1984	318 mm1986 · driest 45 mm in 2001	57
March	27.8°C27 Mar 2025	-7.2°C4 Mar 2019	59 mm2 Mar 1972	346 mm2012 · driest 39 mm in 1992	57
April	32.2°C29 Apr 2023	-5.6°C2 Apr 2008	56 mm8 Apr 2019	267 mm1993 · driest 17 mm in 2021	57
May	35.6°C8 May 1987	-3.3°C1 May 2013	46 mm2 May 1995	234 mm1998 · driest 8 mm in 2018	56
June	44.4°C29 Jun 2021	1.7°C6 Jun 2002	51 mm7 Jun 1984	209 mm1984 · driest 5 mm in 2003	57
July	41.1°C29 Jul 2009	3.9°C25 Jul 2008	34 mm19 Jul 1987	102 mm1983 · driest 0 mm in 2003	57
August	40.6°C14 Aug 2002	2.2°C18 Aug 1973	40 mm24 Aug 1977	108 mm2004 · driest 0 mm in 1988	55
September	38.9°C1 Sep 1987	-0.6°C10 Sep 2007	68 mm6 Sep 2013	220 mm2013 · driest 0 mm in 1993	56
October	33.9°C3 Oct 1980	-6.7°C31 Oct 2002	63 mm19 Oct 1979	312 mm2016 · driest 3 mm in 1987	55
November	23.9°C4 Nov 1975	-8.9°C25 Nov 1993	117 mm26 Nov 1999	455 mm1973 · driest 42 mm in 2019	56
December	20.6°C6 Dec 1974	-17.8°C10 Dec 1972	86 mm18 Dec 2015	453 mm1996 · driest 47 mm in 1976	56

Typical days per month at FOSTER DAM, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	12	7
February	0	0	11	5
March	<1	0	6	6
April	2	<1	2	5
May	6	1	<1	4
June	11	3	0	2
July	24	11	0	<1
August	26	13	0	<1
September	16	6	<1	2
October	3	<1	2	5
November	0	0	8	7
December	0	0	12	8

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

How often, not how much — every day in FOSTER DAM’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%	54%	20%	69%	6.9–10.3°C
February	1%	53%	19%	72%	8.9–12.9°C
March	7%	55%	18%	75%	11.4–15.7°C
April	18%	50%	14%	65%	13.7–18.2°C
May	39%	35%	11%	42%	17.3–21.3°C
June	64%	25%	7%	28%	20.8–25.4°C
July	90%	8%	1%	5%	25.0–30.2°C
August	90%	9%	2%	8%	25.4–29.8°C
September	73%	21%	6%	23%	21.7–26.4°C
October	32%	36%	14%	50%	16.5–20.2°C
November	2%	56%	25%	77%	9.9–13.5°C
December	<1%	57%	25%	75%	6.6–10.1°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.

1970Each stripe is one year’s mean temperature against the 53-year average. Warmest: 2015. Coolest: 1985.2024

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5731629
NOAA station: USC00353047 · FOSTER DAM
Station distance: 11 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 44.35°, 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 FOSTER DAM is what differs

Sweet Home→Crawfordsville→Berlin→Calapooia→Foster→Greenville→

Or put two places side by side: Holley vs Sweet Home

Best time to visitHolley.