United States · 1991–2020

Best time to visit
Koontz Lake.

September leads for comfortable weather in Koontz Lake: typically 24.4°C by day, 11.6°C at night, with 81 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24.4°C

Typical low11.6°C

Rain in September81 mm

Comfort

September

September · June · August

82climate 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 82 — 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° / -8.5°

Feb

52° / -7.2°

Mar

98.4° / -2.4°

Apr

3715.5° / 3.1°

May

6621.8° / 9.2°

Jun

7327° / 14.7°

Jul

6628.7° / 16.6°

Aug

7227.7° / 15.7°

Sep

8224.4° / 11.6°

Oct

4917.3° / 5.7°

Nov

139.1° / -0.1°

Dec

52.5° / -5.1°

Monthly climate evidence for Koontz Lake — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-0.3°C	-8.5°C	65 mm	8.4	9 h 29	5	Strong coverage
February	2°C	-7.2°C	59 mm	6.9	10 h 33	5	Strong coverage
March	8.4°C	-2.4°C	62 mm	8	11 h 48	9	Strong coverage
April	15.5°C	3.1°C	93 mm	9.3	13 h 16	37	Strong coverage
May	21.8°C	9.2°C	110 mm	10	14 h 29	66	Strong coverage
June	27°C	14.7°C	112 mm	9.2	15 h 09	73	Strong coverage
July	28.7°C	16.6°C	111 mm	7.9	14 h 53	66	Strong coverage
August	27.7°C	15.7°C	103 mm	8.2	13 h 50	72	Strong coverage
September	24.4°C	11.6°C	81 mm	7.3	12 h 25	82	Strong coverage
October	17.3°C	5.7°C	87 mm	8.3	11 h 01	49	Strong coverage
November	9.1°C	-0.1°C	77 mm	8.4	9 h 48	13	Strong coverage
December	2.5°C	-5.1°C	66 mm	8.5	9 h 12	5	Strong coverage

Records at PLYMOUTH, 1989–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	18.3°C8 Jan 2008	-30.0°C20 Jan 1994	64 mm31 Jan 2002	159 mm2005 · driest 15 mm in 2025	37
February	23.3°C26 Feb 2000	-28.9°C1 Feb 2019	72 mm21 Feb 2018	188 mm2018 · driest 18 mm in 2004	37
March	30.6°C22 Mar 2012	-21.1°C1 Mar 2015	48 mm11 Mar 2009	126 mm2009 · driest 22 mm in 2001	37
April	30.6°C16 Apr 2002	-8.9°C5 Apr 1995	56 mm1 Apr 2026	254 mm2026 · driest 16 mm in 2004	38
May	36.1°C28 May 2012	-3.3°C9 May 2020	70 mm19 May 1997	197 mm2011 · driest 27 mm in 2005	38
June	40.0°C29 Jun 2012	2.2°C1 Jun 2003	117 mm14 Jun 1994	283 mm2015 · driest 44 mm in 2003	37
July	40.6°C7 Jul 2012	5.6°C6 Jul 2001	114 mm18 Jul 1996	254 mm2026 · driest 30 mm in 2014	37
August	36.1°C2 Aug 1991	5.6°C15 Aug 2014	135 mm18 Aug 1990	228 mm2007 · driest 30 mm in 1996	36
September	36.7°C3 Sep 2011	-1.1°C23 Sep 1995	101 mm10 Sep 2016	188 mm2008 · driest 17 mm in 2009	36
October	32.2°C2 Oct 2019	-3.9°C31 Oct 2020	77 mm17 Oct 1993	230 mm2021 · driest 6 mm in 2024	36
November	26.1°C2 Nov 2016	-14.4°C13 Nov 2019	56 mm12 Nov 1995	157 mm1994 · driest 13 mm in 2012	37
December	20.0°C6 Dec 2001	-27.2°C22 Dec 1989	56 mm30 Dec 1990	159 mm1990 · driest 18 mm in 1995	37

Typical days per month at PLYMOUTH, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	28	2	9
February	0	0	25	2	7
March	<1	0	22	2	4
April	3	<1	9	3	1
May	11	3	<1	4	0
June	21	9	0	4	0
July	27	12	0	3	0
August	26	8	0	4	0
September	15	4	<1	2	0
October	4	<1	4	3	<1
November	<1	0	17	3	2
December	0	0	26	2	7

How often, not how much — every day in PLYMOUTH’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%	26%	6%	29%	-3.2–3.0°C
February	<1%	24%	6%	26%	-1.5–5.8°C
March	6%	27%	7%	34%	5.8–12.6°C
April	18%	32%	11%	41%	13.4–17.8°C
May	45%	32%	12%	37%	19.3–24.8°C
June	66%	31%	13%	36%	25.3–28.6°C
July	74%	26%	12%	26%	26.9–30.5°C
August	73%	26%	11%	24%	26.1–29.0°C
September	65%	24%	7%	27%	22.6–26.5°C
October	28%	27%	10%	30%	15.8–19.3°C
November	4%	28%	8%	33%	5.8–12.5°C
December	0%	28%	7%	31%	-0.6–5.9°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.

1990Each stripe is one year’s mean temperature against the 35-year average. Warmest: 1998. Coolest: 1996.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4922402
NOAA station: USC00126989 · PLYMOUTH
Station distance: 15.3 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 41.42°, 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 PLYMOUTH is what differs

Plymouth→Walkerton→Bourbon→Argos→Culver→Burr Oak→

Or put two places side by side: Koontz Lake vs Plymouth

Best time to visitKoontz Lake.

September

July

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Koontz Lake.

The whole year,
without the guesswork.

Nearby, measured,
and named.