United States · 1991–2020

Best time to visit
Terre du Lac.

September leads for comfortable weather in Terre du Lac: typically 25.5°C by day, 14°C at night, with 97 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25.5°C

Typical low14°C

Rain in September97 mm

Comfort

September

September · May · June

82climate match

Beach

July

July · August · June

78climate match

Outdoors

October

October · April · September

83climate match

The weakest month is January, scoring 5 against September’s 82 — days reach only 4.2°C, 20° 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

54.2° / -5.9°

Feb

57.2° / -3.8°

Mar

2112.8° / 0.8°

Apr

5019.1° / 6.5°

May

7123.4° / 12.1°

Jun

6827.7° / 17.1°

Jul

6230° / 19.1°

Aug

6229.6° / 18.4°

Sep

8225.5° / 14°

Oct

6319.6° / 8°

Nov

2612.3° / 1.6°

Dec

56.2° / -3.2°

Monthly climate evidence for Terre du Lac — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	4.2°C	-5.9°C	67 mm	6	9 h 48	5	Strong coverage
February	7.2°C	-3.8°C	72 mm	6.5	10 h 44	5	Strong coverage
March	12.8°C	0.8°C	109 mm	9.2	11 h 50	21	Strong coverage
April	19.1°C	6.5°C	130 mm	9.1	13 h 07	50	Strong coverage
May	23.4°C	12.1°C	140 mm	10.6	14 h 12	71	Strong coverage
June	27.7°C	17.1°C	112 mm	8.5	14 h 47	68	Strong coverage
July	30°C	19.1°C	91 mm	6.8	14 h 33	62	Strong coverage
August	29.6°C	18.4°C	102 mm	7.1	13 h 38	62	Strong coverage
September	25.5°C	14°C	97 mm	6.2	12 h 23	82	Strong coverage
October	19.6°C	8°C	82 mm	6.5	11 h 09	63	Strong coverage
November	12.3°C	1.6°C	90 mm	7	10 h 04	26	Strong coverage
December	6.2°C	-3.2°C	72 mm	6.9	9 h 33	5	Strong coverage

Records at POTOSI 4 SW, 1893–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	23.3°C21 Jan 1986	-27.8°C20 Jan 1985	84 mm3 Jan 1999	188 mm1999 · driest 2 mm in 2008	48
February	26.7°C16 Feb 2018	-33.3°C13 Feb 1899	82 mm21 Feb 2018	242 mm2018 · driest 1 mm in 2026	50
March	35.0°C23 Mar 2026	-19.4°C3 Mar 2002	107 mm5 Mar 2026	290 mm1898 · driest 31 mm in 1986	49
April	33.9°C20 Apr 1987	-11.1°C1 Apr 1899	104 mm19 Apr 2013	373 mm1994 · driest 34 mm in 1987	48
May	34.4°C31 May 1895	-3.3°C14 May 1895	71 mm5 May 1894	258 mm2016 · driest 21 mm in 1901	49
June	41.1°C29 Jun 2012	2.2°C1 Jun 1894	141 mm26 Jun 1898	263 mm1997 · driest 20 mm in 1901	51
July	44.4°C23 Jul 1901	5.6°C12 Jul 1898	128 mm7 Jul 1993	212 mm1993 · driest 0 mm in 1998	51
August	40.0°C2 Aug 1901	5.0°C12 Aug 2004	100 mm3 Aug 2023	401 mm2023 · driest 17 mm in 1983	49
September	38.3°C5 Sep 1899	-8.9°C30 Sep 1899	89 mm23 Sep 1993	349 mm1993 · driest 11 mm in 1985	50
October	33.3°C1 Oct 1901	-11.7°C24 Oct 1981	100 mm30 Oct 2009	317 mm2009 · driest 11 mm in 1897	49
November	28.9°C11 Nov 1989	-17.8°C30 Nov 1896	129 mm5 Nov 2024	305 mm1985 · driest 9 mm in 2023	47
December	25.0°C4 Dec 2021	-32.2°C20 Dec 1901	77 mm1 Dec 2006	270 mm1987 · driest 1 mm in 2004	48

Typical days per month at POTOSI 4 SW, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	24	2	2
February	<1	0	20	2	3
March	2	0	14	4	2
April	6	<1	4	4	0
May	13	3	<1	4	0
June	24	9	0	4	0
July	28	17	0	3	0
August	28	15	0	3	0
September	17	6	<1	3	0
October	7	<1	2	3	0
November	<1	0	11	3	<1
December	0	0	20	2	2

How often, not how much — every day in POTOSI 4 SW’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	1%	20%	7%	18%	1.8–8.3°C
February	4%	22%	9%	22%	2.7–10.9°C
March	17%	28%	12%	34%	10.0–16.9°C
April	37%	30%	13%	38%	17.0–22.2°C
May	55%	34%	14%	41%	21.7–26.4°C
June	69%	30%	12%	35%	26.4–30.4°C
July	77%	24%	11%	23%	28.4–32.6°C
August	78%	22%	11%	22%	27.7–32.7°C
September	73%	21%	9%	19%	23.6–28.6°C
October	45%	21%	9%	20%	17.3–22.7°C
November	12%	23%	10%	21%	9.0–15.6°C
December	2%	22%	8%	21%	2.9–9.5°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.

1894Each stripe is one year’s mean temperature against the 39-year average. Warmest: 2012. Coolest: 1897.2024

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4411442
NOAA station: USC00236826 · POTOSI 4 SW
Station distance: 19 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 25 usable years
Daylight: Calculated from latitude 37.91°, 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 POTOSI 4 SW is what differs

Potosi→Irondale→Mineral Point→Caledonia→Happy Hollow→Adelbert (historical)→

Or put two places side by side: Terre du Lac vs Potosi

Best time to visitTerre du Lac.