United States · 1991–2020

Best time to visit
Aviston.

September leads for comfortable weather in Aviston: typically 26.7°C by day, 14.4°C at night, with 95 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high26.7°C

Typical low14.4°C

Rain in September95 mm

Comfort

September

September · May · October

79climate match

Beach

August

August · July · June

78climate match

Outdoors

October

October · April · September

83climate match

The weakest month is January, scoring 5 against September’s 79 — days reach only 3.2°C, 21° 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

53.2° / -6.2°

Feb

56.3° / -4.1°

Mar

2211.9° / 1.2°

Apr

4918.5° / 6.9°

May

7523.8° / 13.2°

Jun

6128.7° / 18.1°

Jul

5530.6° / 19.9°

Aug

6230.2° / 19°

Sep

7926.7° / 14.4°

Oct

6420.2° / 7.9°

Nov

2612.3° / 1.8°

Dec

55.7° / -3.2°

Monthly climate evidence for Aviston — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	3.2°C	-6.2°C	79 mm	6.9	9 h 44	5	Strong coverage
February	6.3°C	-4.1°C	65 mm	6.6	10 h 41	5	Good coverage
March	11.9°C	1.2°C	91 mm	8.5	11 h 50	22	Strong coverage
April	18.5°C	6.9°C	122 mm	9.6	13 h 09	49	Strong coverage
May	23.8°C	13.2°C	137 mm	10.1	14 h 15	75	Strong coverage
June	28.7°C	18.1°C	129 mm	8.5	14 h 51	61	Strong coverage
July	30.6°C	19.9°C	107 mm	7.3	14 h 37	55	Strong coverage
August	30.2°C	19°C	86 mm	6.3	13 h 40	62	Strong coverage
September	26.7°C	14.4°C	95 mm	6	12 h 23	79	Strong coverage
October	20.2°C	7.9°C	83 mm	6.9	11 h 07	64	Strong coverage
November	12.3°C	1.8°C	90 mm	7.3	10 h 01	26	Strong coverage
December	5.7°C	-3.2°C	82 mm	8	9 h 29	5	Strong coverage

What has changed

Aviston runs +1.0°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

+1.3

Feb

+1.8

Mar

+1.5

Apr

+0.4

May

+0.7

Jun

+1.0

Jul

+0.2

Aug

+0.2

Sep

+1.3

Oct

+1.0

Nov

-0.1

Dec

+2.1

September daytime highs, 2011–2025. Last recorded: 28.8°C.

Records at CARLYLE RSVR, 1962–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	22.8°C30 Jan 2008	-30.0°C19 Jan 1994	87 mm11 Jan 2020	193 mm2020 · driest 2 mm in 2003	59
February	25.0°C25 Feb 2000	-28.9°C10 Feb 1982	86 mm3 Feb 1986	170 mm2018 · driest 8 mm in 2017	59
March	31.7°C23 Mar 2026	-20.6°C5 Mar 1978	93 mm28 Mar 1977	260 mm2008 · driest 6 mm in 1987	61
April	31.7°C30 Apr 1987	-5.6°C6 Apr 1982	101 mm29 Apr 1996	253 mm1994 · driest 30 mm in 1976	60
May	36.1°C28 May 1967	-0.6°C3 May 1976	75 mm18 May 1995	363 mm1995 · driest 23 mm in 1988	60
June	40.0°C30 Jun 2012	5.0°C21 Jun 1963	141 mm18 Jun 1964	320 mm2000 · driest 11 mm in 2016	61
July	40.6°C6 Jul 2012	10.0°C2 Jul 1985	114 mm16 Jul 1993	317 mm2024 · driest 4 mm in 2012	60
August	40.0°C16 Aug 2007	6.1°C29 Aug 1965	111 mm30 Aug 2003	180 mm2003 · driest 1 mm in 2025	59
September	36.7°C15 Sep 2025	1.7°C23 Sep 1983	97 mm9 Sep 2018	308 mm2012 · driest 2 mm in 1979	59
October	35.0°C2 Oct 2019	-6.1°C25 Oct 1981	89 mm19 Oct 2025	212 mm2009 · driest 10 mm in 1968	60
November	28.3°C1 Nov 1968	-17.8°C30 Nov 1964	131 mm2 Nov 1972	286 mm1985 · driest 6 mm in 1976	59
December	23.3°C2 Dec 1970	-25.6°C26 Dec 1985	90 mm24 Dec 1982	238 mm1982 · driest 10 mm in 1979	59

Typical days per month at CARLYLE RSVR, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	25	3	2
February	0	0	21	2	2
March	1	0	13	3	<1
April	5	<1	3	4	0
May	14	3	0	5	0
June	25	13	0	4	0
July	29	19	0	4	0
August	29	17	0	3	0
September	20	8	0	3	0
October	8	1	2	3	0
November	<1	0	11	3	<1
December	0	0	21	3	<1

How often, not how much — every day in CARLYLE RSVR’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	<1%	20%	7%	21%	-0.1–6.2°C
February	3%	22%	7%	22%	1.4–9.6°C
March	11%	28%	11%	32%	8.2–15.7°C
April	31%	32%	12%	39%	15.9–21.1°C
May	58%	29%	13%	32%	21.7–26.5°C
June	73%	27%	12%	31%	26.9–30.8°C
July	77%	23%	11%	20%	28.8–32.8°C
August	81%	19%	8%	16%	28.4–31.9°C
September	74%	21%	9%	19%	24.4–28.5°C
October	43%	22%	9%	23%	17.8–22.6°C
November	11%	24%	9%	24%	9.0–15.5°C
December	<1%	24%	9%	24%	3.2–9.1°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.

1963Each stripe is one year’s mean temperature against the 47-year average. Warmest: 2024. Coolest: 1979.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4233090
NOAA station: USC00111290 · CARLYLE RSVR
Station distance: 21.3 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 24 usable years
Daylight: Calculated from latitude 38.61°, 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 CARLYLE RSVR is what differs

Breese→Carlyle→Germantown→Beckemeyer→Pocahontas→Bartelso→

Or put two places side by side: Aviston vs Breese

Best time to visitAviston.