United States · 1991–2020

Best time to visit
Armstrong.

August leads for comfortable weather in Armstrong: typically 26°C by day, 14.9°C at night, with 94 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high26°C

Typical low14.9°C

Rain in August94 mm

Comfort

August

August · June · September

80climate match

Beach

July

July · August · June

64climate match

Outdoors

September

September · May · June

81climate match

The weakest month is January, scoring 5 against August’s 80 — days reach only -3°C, 27° 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

5-3° / -11.3°

Feb

5-1.3° / -10.1°

Mar

54.9° / -4.6°

Apr

2312° / 1.3°

May

5318.7° / 7.4°

Jun

7924.4° / 12.9°

Jul

7427.3° / 15.8°

Aug

8026° / 14.9°

Sep

7722.2° / 10.4°

Oct

4014.7° / 4.2°

Nov

76.8° / -1.9°

Dec

50.1° / -7.6°

Monthly climate evidence for Armstrong — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-3°C	-11.3°C	40 mm	6.6	9 h 16	5	Strong coverage
February	-1.3°C	-10.1°C	36 mm	5.9	10 h 25	5	Strong coverage
March	4.9°C	-4.6°C	50 mm	7	11 h 47	5	Strong coverage
April	12°C	1.3°C	92 mm	8.5	13 h 22	23	Strong coverage
May	18.7°C	7.4°C	101 mm	10.2	14 h 42	53	Strong coverage
June	24.4°C	12.9°C	108 mm	9.1	15 h 26	79	Strong coverage
July	27.3°C	15.8°C	93 mm	8.7	15 h 08	74	Strong coverage
August	26°C	14.9°C	94 mm	8.2	13 h 59	80	Strong coverage
September	22.2°C	10.4°C	72 mm	7	12 h 27	77	Strong coverage
October	14.7°C	4.2°C	75 mm	8	10 h 56	40	Strong coverage
November	6.8°C	-1.9°C	54 mm	6.2	9 h 36	7	Strong coverage
December	0.1°C	-7.6°C	46 mm	6.5	8 h 56	5	Strong coverage

What has changed

Armstrong runs -0.1°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

+0.5

Feb

-0.5

Mar

+0.3

Apr

-1.6

May

-1.0

Jun

-0.5

Jul

-0.4

Aug

-0.6

Sep

+0.7

Oct

+0.1

Nov

+0.2

Dec

+1.8

August daytime highs, 2011–2025. Last recorded: 25.5°C.

Records at PLYMOUTH WWTP, 1910–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	15.6°C26 Jan 1944	-33.9°C15 Jan 1972	50 mm24 Jan 1938	91 mm1918 · driest 0 mm in 1981	115
February	21.7°C28 Feb 2024	-32.8°C9 Feb 1933	67 mm22 Feb 1922	110 mm1922 · driest 0 mm in 1968	113
March	28.9°C22 Mar 2012	-27.8°C1 Mar 1962	80 mm31 Mar 1998	153 mm1977 · driest 1 mm in 1978	114
April	31.7°C22 Apr 1980	-13.3°C3 Apr 1954	71 mm24 Apr 1955	209 mm2026 · driest 16 mm in 1915	115
May	34.4°C28 May 2018	-6.1°C10 May 1966	126 mm30 May 1989	279 mm2004 · driest 17 mm in 2008	116
June	38.3°C25 Jun 2005	-1.1°C4 Jun 1945	105 mm8 Jun 2008	265 mm2008 · driest 19 mm in 1912	115
July	41.7°C14 Jul 1936	3.9°C3 Jul 1968	95 mm25 Jul 1985	235 mm1991 · driest 8 mm in 1946	114
August	38.3°C16 Aug 1937	2.2°C30 Aug 1915	132 mm6 Aug 1998	331 mm1924 · driest 3 mm in 1969	114
September	36.7°C2 Sep 1953	-3.9°C26 Sep 1926	155 mm11 Sep 1986	347 mm1986 · driest 1 mm in 1979	113
October	31.1°C1 Oct 1976	-14.4°C30 Oct 1925	89 mm2 Oct 2019	177 mm2019 · driest 3 mm in 1924	115
November	23.9°C1 Nov 1944	-21.7°C29 Nov 1976	101 mm4 Nov 2003	223 mm1985 · driest 2 mm in 1930	115
December	19.4°C6 Dec 2001	-28.9°C28 Dec 1924	47 mm28 Dec 1959	135 mm2015 · driest 4 mm in 1993	115

Typical days per month at PLYMOUTH WWTP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	30	1	7
February	0	0	27	1	6
March	<1	0	25	1	4
April	1	<1	12	3	1
May	6	1	1	4	0
June	15	4	0	4	0
July	23	8	0	3	0
August	20	4	0	3	0
September	10	2	<1	3	0
October	2	<1	7	3	<1
November	0	0	20	2	2
December	0	0	28	1	6

How often, not how much — every day in PLYMOUTH WWTP’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%	19%	3%	16%	-6.8–0.1°C
February	<1%	18%	4%	14%	-4.9–2.3°C
March	2%	22%	6%	25%	1.4–7.9°C
April	10%	29%	9%	36%	9.4–15.2°C
May	33%	31%	9%	38%	16.4–22.0°C
June	61%	29%	10%	35%	22.1–26.5°C
July	74%	26%	9%	28%	25.6–29.7°C
August	71%	26%	10%	27%	24.4–28.1°C
September	50%	27%	10%	31%	20.1–24.1°C
October	18%	25%	7%	29%	12.6–17.9°C
November	2%	23%	7%	22%	3.3–9.4°C
December	0%	19%	4%	17%	-3.9–2.7°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.

1911Each stripe is one year’s mean temperature against the 106-year average. Warmest: 1987. Coolest: 1917.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5244167
NOAA station: USC00476678 · PLYMOUTH WWTP
Station distance: 18.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 43.71°, 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 PLYMOUTH WWTP is what differs

Plymouth→Elkhart Lake→Saint Cloud→Glenbeulah→Greenbush→Banner→

Or put two places side by side: Armstrong vs Plymouth

Best time to visitArmstrong.