United States · 1991–2020

Best time to visit
Spring Arbor.

September leads for comfortable weather in Spring Arbor: typically 23°C by day, 10.7°C at night, with 76 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high23°C

Typical low10.7°C

Rain in September76 mm

Comfort

September

September · June · August

79climate match

Beach

July

July · August · June

68climate match

Outdoors

May

May · September · October

77climate match

The weakest month is January, scoring 5 against September’s 79 — days reach only -0.5°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

5-0.5° / -8.3°

Feb

51.2° / -7.6°

Mar

67.3° / -3.2°

Apr

3514.6° / 2.6°

May

6420.9° / 8.5°

Jun

7825.9° / 13.7°

Jul

7527.9° / 15.7°

Aug

7826.7° / 15°

Sep

7923° / 10.7°

Oct

4516° / 5°

Nov

148.6° / -0.2°

Dec

52.2° / -4.9°

Monthly climate evidence for Spring Arbor — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-0.5°C	-8.3°C	42 mm	7.7	9 h 25	5	Strong coverage
February	1.2°C	-7.6°C	39 mm	6.3	10 h 30	5	Strong coverage
March	7.3°C	-3.2°C	49 mm	7.5	11 h 48	6	Strong coverage
April	14.6°C	2.6°C	76 mm	9.5	13 h 18	35	Strong coverage
May	20.9°C	8.5°C	88 mm	9.9	14 h 33	64	Strong coverage
June	25.9°C	13.7°C	91 mm	8.6	15 h 15	78	Strong coverage
July	27.9°C	15.7°C	83 mm	7.9	14 h 58	75	Strong coverage
August	26.7°C	15°C	96 mm	7.8	13 h 53	78	Strong coverage
September	23°C	10.7°C	76 mm	7.9	12 h 26	79	Strong coverage
October	16°C	5°C	74 mm	9.1	10 h 59	45	Strong coverage
November	8.6°C	-0.2°C	59 mm	8	9 h 44	14	Strong coverage
December	2.2°C	-4.9°C	45 mm	7.6	9 h 07	5	Strong coverage

What has changed

Spring Arbor 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

+1.6

Feb

+1.6

Mar

+1.6

Apr

+0.3

May

+0.6

Jun

+0.2

Jul

0.0

Aug

0.0

Sep

+0.9

Oct

+0.8

Nov

+0.3

Dec

+2.5

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

Records at JACKSON REYNOLDS FLD, 1948–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	21.7°C7 Jan 2008	-28.9°C18 Jan 1976	51 mm11 Jan 2020	94 mm2006 · driest 8 mm in 2022	78
February	22.8°C27 Feb 2024	-28.2°C20 Feb 2015	67 mm20 Feb 2018	112 mm1954 · driest 1 mm in 1987	78
March	29.4°C21 Mar 2012	-21.7°C9 Mar 1978	66 mm8 Mar 1982	151 mm1982 · driest 8 mm in 1981	78
April	31.1°C22 Apr 1980	-16.1°C7 Apr 1982	63 mm20 Apr 2000	188 mm2026 · driest 9 mm in 2004	78
May	35.0°C28 May 2018	-6.1°C10 May 1966	78 mm18 May 2000	189 mm2018 · driest 9 mm in 1950	79
June	38.3°C27 Jun 1971	0.6°C1 Jun 2025	78 mm17 Jun 2024	193 mm2024 · driest 12 mm in 1984	79
July	39.4°C15 Jul 1977	2.8°C2 Jul 2001	73 mm7 Jul 2016	183 mm2024 · driest 16 mm in 1974	79
August	38.9°C2 Aug 1964	2.8°C29 Aug 1965	91 mm16 Aug 2016	242 mm2016 · driest 6 mm in 1976	78
September	37.8°C8 Sep 1978	-2.8°C28 Sep 1991	77 mm1 Sep 2018	236 mm2008 · driest 10 mm in 1956	78
October	32.2°C4 Oct 1951	-8.9°C27 Oct 1976	84 mm14 Oct 2017	194 mm2017 · driest 4 mm in 2005	78
November	26.1°C1 Nov 1950	-20.6°C26 Nov 1949	68 mm7 Nov 1996	141 mm1988 · driest 11 mm in 2012	78
December	20.6°C5 Dec 2001	-25.6°C24 Dec 1983	52 mm29 Dec 1990	109 mm1965 · driest 9 mm in 1960	78

Typical days per month at JACKSON REYNOLDS FLD, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	28	<1	12
February	0	0	26	1	6
March	<1	0	23	1	4
April	1	0	10	3	1
May	8	2	1	3	0
June	19	6	0	3	0
July	26	9	0	3	0
August	23	5	0	3	0
September	11	3	<1	3	0
October	2	<1	6	3	<1
November	<1	0	17	2	2
December	0	0	26	1	7

The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 84); on 2011–2025 it is September (89). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in JACKSON REYNOLDS FLD’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%	3%	24%	-4.4–2.3°C
February	0%	23%	4%	24%	-2.4–4.2°C
March	4%	27%	5%	32%	3.5–10.4°C
April	16%	32%	8%	40%	11.7–16.7°C
May	43%	29%	9%	34%	18.3–23.4°C
June	67%	28%	10%	31%	24.2–27.7°C
July	74%	26%	10%	27%	26.4–29.8°C
August	75%	24%	9%	22%	25.4–28.8°C
September	57%	25%	8%	28%	21.3–25.1°C
October	23%	25%	6%	29%	13.9–18.6°C
November	3%	28%	6%	32%	4.8–11.6°C
December	0%	27%	5%	30%	-1.6–4.7°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.

1949Each stripe is one year’s mean temperature against the 77-year average. Warmest: 1998. Coolest: 2014.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5010780
NOAA station: USW00014833 · JACKSON REYNOLDS FLD
Station distance: 10.3 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude 42.21°, 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 JACKSON REYNOLDS FLD is what differs

Jackson→Albion→Vandercook Lake→Michigan Center→Leslie→Concord→

Or put two places side by side: Spring Arbor vs Jackson

Best time to visitSpring Arbor.

September

July

May

The whole year,without the guesswork.

Spring Arbor runs +0.9°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Spring Arbor.

The whole year,
without the guesswork.

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

Nearby, measured,
and named.