United States · 1991–2020

Best time to visit
Lake Dalecarlia.

September leads for comfortable weather in Lake Dalecarlia: typically 24.9°C by day, 11.4°C at night, with 84 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24.9°C

Typical low11.4°C

Rain in September84 mm

Comfort

September

September · August · June

80climate match

Beach

July

July · August · June

68climate match

Outdoors

May

May · September · October

72climate match

The weakest month is January, scoring 5 against September’s 80 — days reach only -0.3°C, 24° 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

5-0.3° / -9.3°

Feb

52.2° / -7.7°

Mar

108.6° / -2.5°

Apr

3715.8° / 3.1°

May

6621.9° / 9.4°

Jun

7127.1° / 15°

Jul

6628.6° / 16.9°

Aug

7227.7° / 15.8°

Sep

8024.9° / 11.4°

Oct

4817.7° / 5°

Nov

159.5° / -0.8°

Dec

52.7° / -6.1°

Monthly climate evidence for Lake Dalecarlia — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 33 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	-0.3°C	-9.3°C	59 mm	8.1	3.2°C	9 h 30	5	Strong coverage
February	2.2°C	-7.7°C	49 mm	7.2	1.7°C	10 h 33	5	Strong coverage
March	8.6°C	-2.5°C	59 mm	8.4	1.8°C	11 h 48	10	Strong coverage
April	15.8°C	3.1°C	93 mm	10.4	4.0°C	13 h 15	37	Strong coverage
May	21.9°C	9.4°C	108 mm	10.4	7.9°C	14 h 29	66	Strong coverage
June	27.1°C	15°C	130 mm	9.5	15.1°C	15 h 08	71	Strong coverage
July	28.6°C	16.9°C	110 mm	8.6	21.3°C	14 h 53	66	Strong coverage
August	27.7°C	15.8°C	109 mm	7.7	22.6°C	13 h 50	72	Strong coverage
September	24.9°C	11.4°C	84 mm	7.1	20.2°C	12 h 25	80	Strong coverage
October	17.7°C	5°C	91 mm	8.7	14.7°C	11 h 01	48	Strong coverage
November	9.5°C	-0.8°C	67 mm	8.1	9.5°C	9 h 48	15	Strong coverage
December	2.7°C	-6.1°C	57 mm	7.6	5.8°C	9 h 12	5	Strong coverage

What has changed

Lake Dalecarlia runs +0.7°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

+1.4

Feb

+1.2

Mar

+1.5

Apr

0.0

May

+0.2

Jun

0.0

Jul

-0.6

Aug

+0.1

Sep

+1.1

Oct

+0.6

Nov

+0.2

Dec

+2.6

September daytime highs, 2011–2025. Last recorded: 25.8°C.

Records at LOWELL WWTP, 1963–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	18.9°C8 Jan 2008	-33.3°C16 Jan 1977	76 mm11 Jan 2020	130 mm2005 · driest 3 mm in 1986	62
February	22.8°C26 Feb 2000	-30.6°C11 Feb 2014	64 mm1 Feb 1968	169 mm2018 · driest 12 mm in 1977	62
March	29.4°C22 Mar 2012	-22.8°C4 Mar 2002	56 mm8 Mar 2009	144 mm1977 · driest 18 mm in 2001	63
April	32.8°C25 Apr 1986	-13.9°C7 Apr 1982	99 mm14 Apr 1981	295 mm1981 · driest 18 mm in 1971	63
May	35.6°C28 May 2018	-4.4°C9 May 2020	74 mm29 May 1989	225 mm2019 · driest 10 mm in 1964	62
June	40.0°C25 Jun 1988	0.6°C11 Jun 1972	149 mm13 Jun 1972	288 mm2015 · driest 13 mm in 1991	63
July	38.3°C6 Jul 1988	5.0°C6 Jul 1972	93 mm21 Jul 2003	335 mm2003 · driest 16 mm in 1991	62
August	40.0°C1 Aug 1988	3.3°C29 Aug 1986	134 mm17 Aug 1968	340 mm2007 · driest 23 mm in 1996	62
September	36.7°C10 Sep 1983	-2.2°C23 Sep 1995	81 mm9 Sep 1992	296 mm2008 · driest 0 mm in 1979	63
October	33.3°C6 Oct 1963	-7.8°C28 Oct 1976	92 mm24 Oct 2021	225 mm2021 · driest 7 mm in 1964	63
November	26.1°C2 Nov 2016	-16.7°C22 Nov 2015	131 mm27 Nov 1990	243 mm1985 · driest 12 mm in 2021	63
December	21.1°C4 Dec 2012	-33.9°C22 Dec 1989	89 mm24 Dec 1965	160 mm1971 · driest 12 mm in 1995	63

Typical days per month at LOWELL WWTP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	28	2	6
February	0	0	25	1	5
March	<1	0	22	2	2
April	3	<1	9	3	<1
May	11	3	<1	4	0
June	22	9	0	3	0
July	27	12	0	4	0
August	26	9	0	3	0
September	16	5	<1	2	0
October	5	<1	6	3	<1
November	<1	0	18	2	<1
December	0	0	26	2	4

How often, not how much — every day in LOWELL 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%	24%	5%	25%	-4.7–3.2°C
February	<1%	24%	4%	25%	-2.3–5.8°C
March	5%	28%	7%	36%	4.9–12.1°C
April	18%	35%	12%	46%	13.5–18.6°C
May	44%	32%	11%	39%	19.0–25.2°C
June	65%	30%	11%	34%	25.2–28.8°C
July	72%	28%	11%	31%	27.3–30.8°C
August	75%	24%	10%	25%	26.3–29.3°C
September	65%	24%	9%	27%	23.1–26.7°C
October	29%	27%	9%	31%	15.6–20.1°C
November	5%	27%	8%	32%	6.1–12.3°C
December	0%	27%	7%	30%	-1.7–5.8°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.

1964Each stripe is one year’s mean temperature against the 58-year average. Warmest: 1998. Coolest: 1979.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4922501
NOAA station: USC00125174 · LOWELL WWTP
Station distance: 7.6 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 41.33°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 33 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
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 LOWELL WWTP is what differs

Crown Point→Cedar Lake→Lowell→Winfield→Roselawn→Grant Park→

Or put two places side by side: Lake Dalecarlia vs Crown Point

Best time to visitLake Dalecarlia.

September

July

May

The whole year,without the guesswork.

Lake Dalecarlia runs +0.7°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Lake Dalecarlia.

The whole year,
without the guesswork.

Lake Dalecarlia runs +0.7°C
on the 1961–1990 baseline.

Nearby, measured,
and named.