United States · 1991–2020

Best time to visit
Dellwood.

August leads for comfortable weather in Dellwood: typically 27°C by day, 13.6°C at night, with 107 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high27°C

Typical low13.6°C

Rain in August107 mm

Comfort

August

August · July · September

73climate match

Beach

July

July · August · June

63climate match

Outdoors

September

September · May · October

72climate match

The weakest month is January, scoring 5 against August’s 73 — 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° / -13.7°

Feb

5-0.6° / -12.5°

Mar

56.3° / -6.1°

Apr

2413.7° / 0.3°

May

5820.8° / 7°

Jun

7026° / 12.8°

Jul

7228° / 14.9°

Aug

7327° / 13.6°

Sep

7222.8° / 8.9°

Oct

3915.3° / 2.3°

Nov

56.9° / -3.8°

Dec

5-0.1° / -9.7°

Monthly climate evidence for Dellwood — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-3.1°C	-13.7°C	31 mm	5.5	9 h 16	5	Strong coverage
February	-0.6°C	-12.5°C	34 mm	5.3	10 h 25	5	Strong coverage
March	6.3°C	-6.1°C	59 mm	6.9	11 h 47	5	Strong coverage
April	13.7°C	0.3°C	104 mm	9.6	13 h 21	24	Strong coverage
May	20.8°C	7°C	111 mm	10.3	14 h 41	58	Strong coverage
June	26°C	12.8°C	130 mm	9.6	15 h 24	70	Strong coverage
July	28°C	14.9°C	103 mm	8.2	15 h 07	72	Strong coverage
August	27°C	13.6°C	107 mm	8	13 h 58	73	Strong coverage
September	22.8°C	8.9°C	97 mm	8.3	12 h 27	72	Strong coverage
October	15.3°C	2.3°C	72 mm	8.3	10 h 56	39	Strong coverage
November	6.9°C	-3.8°C	55 mm	6.5	9 h 37	5	Strong coverage
December	-0.1°C	-9.7°C	44 mm	6.8	8 h 57	5	Strong coverage

What has changed

Dellwood runs +0.9°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

+1.0

Feb

+0.3

Mar

+1.2

Apr

-0.9

May

0.0

Jun

+1.2

Jul

+0.8

Aug

+1.0

Sep

+2.3

Oct

+0.7

Nov

+1.0

Dec

+2.1

August daytime highs, 2011–2025. Last recorded: 25.7°C.

Records at WISCONSIN DELLS WWTP, 1922–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	17.2°C26 Jan 1944	-41.7°C30 Jan 1951	35 mm9 Jan 2026	86 mm1929 · driest 0 mm in 1987	98
February	20.0°C28 Feb 2024	-38.9°C20 Feb 1929	46 mm27 Feb 1948	77 mm2008 · driest 0 mm in 1986	95
March	28.9°C29 Mar 1986	-33.9°C1 Mar 1962	86 mm31 Mar 1998	154 mm1998 · driest 0 mm in 1989	98
April	32.8°C22 Apr 1980	-17.8°C15 Apr 1928	61 mm13 Apr 2014	228 mm2014 · driest 13 mm in 1936	97
May	36.7°C28 May 2018	-6.1°C4 May 1935	65 mm18 May 2000	322 mm2004 · driest 7 mm in 1981	100
June	37.2°C30 Jun 1963	-0.6°C20 Jun 1992	104 mm7 Jun 2008	288 mm2008 · driest 12 mm in 2012	99
July	45.6°C13 Jul 1936	5.0°C7 Jul 1984	133 mm15 Jul 2010	263 mm2010 · driest 11 mm in 1937	97
August	40.0°C16 Aug 1937	1.7°C29 Aug 1935	195 mm7 Aug 1980	359 mm1980 · driest 9 mm in 1922	99
September	38.3°C7 Sep 1922	-4.4°C28 Sep 1942	124 mm22 Sep 2016	326 mm1965 · driest 4 mm in 2004	98
October	32.2°C6 Oct 1963	-18.9°C30 Oct 1925	115 mm23 Oct 2020	163 mm2019 · driest 3 mm in 1952	99
November	27.2°C1 Nov 1938	-23.9°C30 Nov 1947	60 mm2 Nov 1961	148 mm1945 · driest 1 mm in 1976	98
December	19.4°C16 Dec 2021	-32.8°C26 Dec 2000	48 mm14 Dec 2015	145 mm2015 · driest 5 mm in 1998	97

Typical days per month at WISCONSIN DELLS 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	28	1	6
March	<1	0	26	2	3
April	2	<1	16	4	1
May	8	2	3	4	0
June	20	6	0	4	0
July	26	10	0	3	0
August	23	6	0	3	0
September	12	3	1	3	0
October	2	<1	12	2	<1
November	0	0	23	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 83); on 2011–2025 it is September (81). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in WISCONSIN DELLS 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%	18%	2%	14%	-6.9–-0.3°C
February	0%	17%	3%	15%	-4.1–2.8°C
March	3%	23%	6%	25%	2.7–9.6°C
April	15%	30%	10%	38%	10.9–17.1°C
May	42%	31%	10%	37%	17.9–23.7°C
June	63%	32%	13%	37%	23.6–27.8°C
July	74%	26%	10%	27%	26.2–30.3°C
August	73%	26%	10%	27%	24.9–29.5°C
September	54%	27%	10%	32%	20.5–25.4°C
October	24%	24%	7%	25%	12.8–19.5°C
November	3%	21%	6%	19%	2.9–9.1°C
December	0%	21%	3%	18%	-3.6–3.1°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.

1923Each stripe is one year’s mean temperature against the 85-year average. Warmest: 2012. Coolest: 1996.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5250441
NOAA station: USC00479319 · WISCONSIN DELLS WWTP
Station distance: 7.9 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 28 usable years
Daylight: Calculated from latitude 43.56°, 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 WISCONSIN DELLS WWTP is what differs

Lake Delton→Wisconsin Dells→Big Spring→Briggsville→Dell Prairie (historical)→Douglas Center→

Or put two places side by side: Dellwood vs Lake Delton

Best time to visitDellwood.

August

July

September

The whole year,without the guesswork.

Dellwood runs +0.9°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Dellwood.

The whole year,
without the guesswork.

Dellwood runs +0.9°C
on the 1961–1990 baseline.

Nearby, measured,
and named.