United States · 1991–2020

Best time to visit
Dekorra.

September leads for comfortable weather in Dekorra: typically 22.7°C by day, 10.5°C at night, with 90 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high22.7°C

Typical low10.5°C

Rain in September90 mm

Comfort

September

September · August · June

76climate match

Beach

July

July · August · June

64climate match

Outdoors

September

September · May · October

75climate match

The weakest month is January, scoring 5 against September’s 76 — days reach only -3.1°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

5-3.1° / -12.2°

Feb

5-0.6° / -10.3°

Mar

56° / -4.2°

Apr

2613.4° / 2.2°

May

5820.3° / 8.9°

Jun

7225.7° / 14.4°

Jul

6927.8° / 16.5°

Aug

7526.8° / 15.3°

Sep

7622.7° / 10.5°

Oct

4215.4° / 4.1°

Nov

77° / -1.9°

Dec

50.1° / -8.2°

Monthly climate evidence for Dekorra — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-3.1°C	-12.2°C	36 mm	6.6	9 h 17	5	Strong coverage
February	-0.6°C	-10.3°C	36 mm	6	10 h 26	5	Strong coverage
March	6°C	-4.2°C	54 mm	6.9	11 h 47	5	Strong coverage
April	13.4°C	2.2°C	105 mm	9.6	13 h 21	26	Strong coverage
May	20.3°C	8.9°C	116 mm	11.1	14 h 40	58	Strong coverage
June	25.7°C	14.4°C	142 mm	9.9	15 h 24	72	Strong coverage
July	27.8°C	16.5°C	115 mm	7.9	15 h 06	69	Strong coverage
August	26.8°C	15.3°C	105 mm	8.6	13 h 58	75	Strong coverage
September	22.7°C	10.5°C	90 mm	8	12 h 27	76	Strong coverage
October	15.4°C	4.1°C	73 mm	8	10 h 56	42	Strong coverage
November	7°C	-1.9°C	56 mm	6.3	9 h 37	7	Strong coverage
December	0.1°C	-8.2°C	43 mm	6.9	8 h 58	5	Strong coverage

What has changed

Dekorra runs -0.3°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

-0.1

Mar

+0.4

Apr

-2.3

May

-1.3

Jun

-0.5

Jul

-0.9

Aug

-0.6

Sep

+0.5

Oct

-0.6

Nov

-0.1

Dec

+1.8

September daytime highs, 2011–2025. Last recorded: 24.6°C.

Records at PORTAGE WWTP, 1896–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	14.4°C31 Jan 2025	-37.2°C15 Jan 1963	34 mm24 Jan 1967	82 mm1999 · driest 1 mm in 2025	130
February	22.2°C28 Feb 2024	-38.3°C1 Feb 1918	48 mm23 Feb 1922	95 mm1971 · driest 1 mm in 1987	130
March	28.3°C30 Mar 1986	-31.7°C1 Mar 1962	90 mm31 Mar 1998	149 mm1998 · driest 1 mm in 1910	131
April	37.2°C19 Apr 1985	-15.0°C7 Apr 1982	76 mm4 Apr 1999	211 mm2008 · driest 10 mm in 1989	131
May	38.9°C31 May 1934	-6.7°C10 May 1966	94 mm18 May 2000	257 mm2004 · driest 12 mm in 1925	131
June	40.0°C23 Jun 1911	-1.7°C10 Jun 1972	158 mm8 Jun 2008	464 mm2008 · driest 14 mm in 2012	131
July	43.9°C14 Jul 1936	2.8°C31 Jul 1971	140 mm15 Jul 2010	341 mm1993 · driest 23 mm in 1967	131
August	39.4°C2 Aug 1988	0.6°C29 Aug 1965	191 mm28 Aug 2020	409 mm1980 · driest 6 mm in 1927	129
September	39.4°C6 Sep 1922	-8.3°C22 Sep 1974	102 mm13 Sep 1961	366 mm1965 · driest 9 mm in 1952	130
October	33.9°C6 Oct 1963	-13.3°C30 Oct 1925	85 mm23 Oct 2020	160 mm1984 · driest 1 mm in 1953	130
November	24.4°C1 Nov 1933	-23.3°C29 Nov 1976	59 mm4 Nov 2003	154 mm1985 · driest 1 mm in 1976	129
December	19.4°C16 Dec 2021	-31.1°C24 Dec 1983	46 mm2 Dec 1921	100 mm2015 · driest 4 mm in 1898	130

Typical days per month at PORTAGE 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	24	2	3
April	1	<1	10	4	1
May	8	2	<1	4	0
June	19	6	0	4	0
July	25	9	0	4	0
August	23	6	0	3	0
September	12	2	<1	3	0
October	2	<1	7	2	<1
November	0	0	20	2	2
December	0	0	29	1	6

The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 77); on 2011–2025 it is September (83). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in PORTAGE 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%	2%	14%	-6.5–0.5°C
February	<1%	17%	3%	14%	-4.5–3.3°C
March	3%	22%	5%	22%	2.5–9.8°C
April	17%	29%	10%	36%	11.3–17.6°C
May	45%	31%	10%	39%	18.6–24.2°C
June	65%	31%	12%	37%	24.1–28.8°C
July	74%	25%	10%	25%	26.6–31.1°C
August	73%	26%	10%	26%	25.0–29.5°C
September	56%	26%	10%	31%	20.9–25.4°C
October	25%	23%	7%	24%	13.5–19.4°C
November	2%	21%	6%	19%	3.7–10.4°C
December	0%	19%	3%	16%	-3.8–3.3°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.

1897Each stripe is one year’s mean temperature against the 123-year average. Warmest: 1931. Coolest: 1917.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5250412
NOAA station: USC00476718 · PORTAGE WWTP
Station distance: 8.5 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude 43.46°, 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 PORTAGE WWTP is what differs

Portage→Pardeeville→Wyocena→Anacker→

Or put two places side by side: Dekorra vs Portage

Best time to visitDekorra.

September

July

September

The whole year,without the guesswork.

Dekorra runs -0.3°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Dekorra.

The whole year,
without the guesswork.

Dekorra runs -0.3°C
on the 1961–1990 baseline.

Nearby, measured,
and named.