United States · 1991–2020

Best time to visit
Plain.

September leads for comfortable weather in Plain: typically 23.7°C by day, 10.4°C at night, with 87 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high23.7°C

Typical low10.4°C

Rain in September87 mm

Comfort

September

September · August · June

80climate match

Beach

July

July · August · June

69climate match

Outdoors

September

September · May · October

74climate match

The weakest month is January, scoring 5 against September’s 80 — days reach only -2°C, 26° 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

5-2° / -12.2°

Feb

5-0.5° / -11.4°

Mar

57.2° / -3.8°

Apr

3415° / 2.2°

May

6321.3° / 8.5°

Jun

7126.6° / 14.3°

Jul

6928.7° / 16.2°

Aug

7627.4° / 14.9°

Sep

8023.7° / 10.4°

Oct

4515.8° / 3.6°

Nov

138.2° / -2.2°

Dec

50.4° / -9°

Monthly climate evidence for Plain — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-2°C	-12.2°C	21 mm	4.3	9 h 18	5	Good coverage
February	-0.5°C	-11.4°C	23 mm	4.8	10 h 26	5	Good coverage
March	7.2°C	-3.8°C	49 mm	7.1	11 h 47	5	Good coverage
April	15°C	2.2°C	94 mm	8.9	13 h 21	34	Good coverage
May	21.3°C	8.5°C	103 mm	10.3	14 h 39	63	Good coverage
June	26.6°C	14.3°C	126 mm	10.4	15 h 22	71	Good coverage
July	28.7°C	16.2°C	102 mm	7.5	15 h 05	69	Good coverage
August	27.4°C	14.9°C	101 mm	7.4	13 h 57	76	Good coverage
September	23.7°C	10.4°C	87 mm	7.4	12 h 27	80	Good coverage
October	15.8°C	3.6°C	64 mm	7	10 h 57	45	Good coverage
November	8.2°C	-2.2°C	46 mm	5.4	9 h 38	13	Good coverage
December	0.4°C	-9°C	32 mm	5.4	8 h 59	5	Good coverage

What has changed

Plain runs +1.2°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

+2.5

Feb

+0.9

Mar

+2.2

Apr

-0.2

May

+0.4

Jun

+1.1

Jul

+0.6

Aug

+0.7

Sep

+2.0

Oct

+0.4

Nov

+0.8

Dec

+2.4

September daytime highs, 2011–2025. Last recorded: 26.2°C.

Records at LONE ROCK TRI CO AP, 1948–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	15.0°C30 Jan 2025	-47.2°C30 Jan 1951	30 mm24 Jan 1967	57 mm1967 · driest 0 mm in 2025	61
February	22.8°C27 Feb 2024	-41.1°C2 Feb 1951	35 mm27 Feb 2023	75 mm1971 · driest 2 mm in 1958	60
March	28.3°C28 Mar 2025	-39.4°C1 Mar 1962	41 mm19 Mar 2020	112 mm2004 · driest 7 mm in 1978	60
April	36.1°C23 Apr 1980	-19.4°C7 Apr 1982	80 mm12 Apr 2014	212 mm2014 · driest 18 mm in 2005	60
May	36.1°C27 May 2018	-6.1°C3 May 2005	80 mm21 May 2004	263 mm2004 · driest 9 mm in 1981	60
June	37.2°C7 Jun 2011	1.1°C11 Jun 1972	132 mm22 Jun 2013	256 mm2010 · driest 17 mm in 2023	60
July	38.9°C6 Jul 2012	4.4°C15 Jul 1967	93 mm14 Jul 2020	222 mm1952 · driest 22 mm in 1967	60
August	38.3°C24 Aug 1948	2.8°C20 Aug 1950	117 mm27 Aug 1959	376 mm2007 · driest 2 mm in 1970	60
September	37.8°C9 Sep 1955	-6.7°C29 Sep 1949	106 mm12 Sep 1961	281 mm1961 · driest 11 mm in 2004	60
October	34.4°C6 Oct 1963	-13.3°C29 Oct 1952	102 mm22 Oct 2020	162 mm2019 · driest 1 mm in 1952	61
November	25.6°C2 Nov 2022	-27.8°C26 Nov 1977	67 mm2 Nov 1961	131 mm2003 · driest 1 mm in 2017	61
December	20.6°C15 Dec 2021	-37.8°C27 Dec 1950	44 mm13 Dec 2015	87 mm2015 · driest 2 mm in 2000	61

Typical days per month at LONE ROCK TRI CO AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	30	<1
February	0	0	27	<1
March	<1	0	24	1
April	2	<1	11	3
May	9	2	2	4
June	21	7	0	4
July	28	11	0	3
August	25	7	0	3
September	13	3	<1	3
October	3	<1	9	2
November	0	0	20	2
December	0	0	28	<1

The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 80); on 2011–2025 it is September (84). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in LONE ROCK TRI CO AP’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%	16%	1%	12%	-6.5–-0.3°C
February	<1%	16%	2%	11%	-3.5–3.6°C
March	3%	23%	5%	25%	3.0–11.1°C
April	18%	30%	9%	37%	11.8–17.1°C
May	47%	30%	10%	39%	19.4–24.1°C
June	65%	32%	13%	40%	24.4–28.9°C
July	74%	26%	10%	26%	27.1–30.2°C
August	74%	25%	10%	26%	25.6–29.2°C
September	60%	24%	8%	27%	20.8–25.7°C
October	25%	21%	6%	22%	13.5–19.3°C
November	3%	20%	4%	16%	4.7–10.4°C
December	<1%	18%	3%	14%	-3.3–3.6°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.

1949Each stripe is one year’s mean temperature against the 57-year average. Warmest: 2024. Coolest: 1951.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5267279
NOAA station: USW00014921 · LONE ROCK TRI CO AP
Station distance: 13.9 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 19 usable years
Daylight: Calculated from latitude 43.28°, 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 LONE ROCK TRI CO AP is what differs

Spring Green→Lone Rock→Avoca→Gotham→Bear Valley→Clyde→

Or put two places side by side: Plain vs Spring Green

Best time to visitPlain.

September

July

September

The whole year,without the guesswork.

Plain runs +1.2°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Plain.

The whole year,
without the guesswork.

Plain runs +1.2°C
on the 1961–1990 baseline.

Nearby, measured,
and named.