United States · 1991–2020

Best time to visit
Old Appleton.

September leads for comfortable weather in Old Appleton: typically 27.1°C by day, 12.8°C at night, with 81 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high27.1°C

Typical low12.8°C

Rain in September81 mm

Comfort

September

September · May · June

77climate match

Beach

August

August · July · June

73climate match

Outdoors

October

October · April · September

78climate match

The weakest month is January, scoring 5 against September’s 77 — days reach only 5.1°C, 19° 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

55.1° / -5.7°

Feb

67.9° / -4.1°

Mar

2613.4° / 0.3°

Apr

5119.7° / 5.8°

May

7024.8° / 11.7°

Jun

6429.6° / 17°

Jul

5631.3° / 19°

Aug

6330.6° / 17.6°

Sep

7727.1° / 12.8°

Oct

6320.9° / 6.3°

Nov

2513.1° / 0.6°

Dec

57.1° / -3.6°

Monthly climate evidence for Old Appleton — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	5.1°C	-5.7°C	62 mm	4.9	9 h 50	5	Strong coverage
February	7.9°C	-4.1°C	65 mm	5.1	10 h 44	6	Strong coverage
March	13.4°C	0.3°C	97 mm	7.8	11 h 50	26	Strong coverage
April	19.7°C	5.8°C	133 mm	8.3	13 h 07	51	Strong coverage
May	24.8°C	11.7°C	146 mm	9.8	14 h 10	70	Strong coverage
June	29.6°C	17°C	111 mm	6.8	14 h 45	64	Strong coverage
July	31.3°C	19°C	97 mm	7.3	14 h 31	56	Strong coverage
August	30.6°C	17.6°C	89 mm	6.2	13 h 36	63	Strong coverage
September	27.1°C	12.8°C	81 mm	5.6	12 h 23	77	Strong coverage
October	20.9°C	6.3°C	91 mm	6.2	11 h 09	63	Strong coverage
November	13.1°C	0.6°C	103 mm	6.7	10 h 06	25	Strong coverage
December	7.1°C	-3.6°C	77 mm	6.2	9 h 35	5	Strong coverage

What has changed

Old Appleton runs -0.5°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

-0.2

Feb

-0.3

Mar

0.0

Apr

-1.0

May

-0.7

Jun

+0.1

Jul

-0.8

Aug

-1.5

Sep

0.0

Oct

-0.9

Nov

-1.6

Dec

+1.1

September daytime highs, 2011–2025. Last recorded: 29.0°C.

Records at PERRYVILLE WTP, 1907–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	23.3°C29 Jan 1970	-26.7°C19 Jan 1977	89 mm20 Jan 1990	275 mm1950 · driest 0 mm in 1996	76
February	28.3°C13 Feb 1962	-28.3°C9 Feb 1979	65 mm11 Feb 2009	171 mm2008 · driest 0 mm in 1988	78
March	31.7°C24 Mar 1910	-17.8°C6 Mar 2015	131 mm28 Mar 1977	244 mm1977 · driest 0 mm in 1910	77
April	33.3°C23 Apr 1965	-8.3°C7 Apr 1971	125 mm16 Apr 1998	340 mm2017 · driest 6 mm in 1995	77
May	36.7°C31 May 1911	-2.2°C3 May 1978	110 mm10 May 1986	313 mm1986 · driest 14 mm in 1977	77
June	43.3°C29 Jun 2012	2.8°C1 Jun 1972	98 mm23 Jun 1969	235 mm2015 · driest 14 mm in 2005	73
July	42.2°C1 Jul 2012	3.3°C4 Jul 2017	99 mm4 Jul 2001	307 mm2001 · driest 15 mm in 1974	74
August	42.8°C3 Aug 1964	1.7°C29 Aug 1986	121 mm26 Aug 1975	269 mm1975 · driest 6 mm in 2024	72
September	40.0°C5 Sep 1954	-1.7°C23 Sep 1995	123 mm8 Sep 2018	263 mm1965 · driest 0 mm in 1979	76
October	35.6°C5 Oct 1954	-15.6°C23 Oct 1982	124 mm18 Oct 1996	237 mm2009 · driest 0 mm in 1964	76
November	30.0°C13 Nov 1989	-20.6°C25 Nov 1950	83 mm1 Nov 1972	242 mm1972 · driest 5 mm in 1910	77
December	25.6°C18 Dec 1908	-25.0°C23 Dec 1989	105 mm26 Dec 1987	203 mm1987 · driest 5 mm in 1955	77

Typical days per month at PERRYVILLE WTP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	25	2	<1
February	<1	0	21	2	<1
March	2	0	16	3	<1
April	6	<1	5	4	0
May	17	5	<1	5	0
June	26	16	0	4	0
July	29	21	0	3	0
August	29	18	0	3	0
September	21	9	<1	2	0
October	9	1	4	3	0
November	<1	0	15	3	<1
December	0	0	23	3	<1

How often, not how much — every day in PERRYVILLE WTP’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	2%	18%	7%	16%	2.5–8.9°C
February	5%	19%	8%	18%	4.1–11.6°C
March	17%	25%	10%	28%	9.9–17.6°C
April	40%	28%	13%	32%	17.6–22.9°C
May	62%	29%	13%	33%	23.0–28.0°C
June	76%	24%	11%	25%	27.7–32.0°C
July	76%	23%	10%	23%	29.9–34.0°C
August	80%	20%	9%	17%	28.9–33.4°C
September	77%	19%	8%	15%	25.2–30.0°C
October	54%	19%	9%	18%	19.6–23.3°C
November	17%	22%	10%	19%	10.8–16.6°C
December	2%	20%	8%	20%	4.9–10.4°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.

1950Each stripe is one year’s mean temperature against the 59-year average. Warmest: 1954. Coolest: 2014.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4374991
NOAA station: USC00236641 · PERRYVILLE WTP
Station distance: 23.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 28 usable years
Daylight: Calculated from latitude 37.60°, 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 PERRYVILLE WTP is what differs

Perryville→Brewer→Frohna→Longtown→Lithium→Biehle→

Or put two places side by side: Old Appleton vs Perryville

Best time to visitOld Appleton.