United States · 1991–2020

Best time to visit
Boonsboro.

September leads for comfortable weather in Boonsboro: typically 26.1°C by day, 12.3°C at night, with 115 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high26.1°C

Typical low12.3°C

Rain in September115 mm

Comfort

September

September · May · June

72climate match

Beach

August

August · July · June

73climate match

Outdoors

October

October · April · May

76climate match

The weakest month is January, scoring 5 against September’s 72 — days reach only 5.2°C, 19° 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

55.2° / -5.6°

Feb

57.1° / -5.2°

Mar

1812° / -1.6°

Apr

4718.5° / 3.8°

May

7123.5° / 9.6°

Jun

6927.9° / 14.6°

Jul

6030.4° / 16.8°

Aug

6929.6° / 16.2°

Sep

7226.1° / 12.3°

Oct

5719.6° / 6°

Nov

3213.6° / 0.2°

Dec

57.4° / -3.7°

Monthly climate evidence for Boonsboro — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	5.2°C	-5.6°C	74 mm	8.6	9 h 40	5	Good coverage
February	7.1°C	-5.2°C	54 mm	6.6	10 h 39	5	Good coverage
March	12°C	-1.6°C	84 mm	8.8	11 h 49	18	Good coverage
April	18.5°C	3.8°C	94 mm	10.2	13 h 11	47	Good coverage
May	23.5°C	9.6°C	111 mm	10.8	14 h 19	71	Good coverage
June	27.9°C	14.6°C	116 mm	9.7	14 h 56	69	Good coverage
July	30.4°C	16.8°C	112 mm	9	14 h 42	60	Good coverage
August	29.6°C	16.2°C	75 mm	7.7	13 h 43	69	Good coverage
September	26.1°C	12.3°C	115 mm	8.1	12 h 24	72	Good coverage
October	19.6°C	6°C	95 mm	7.5	11 h 05	57	Good coverage
November	13.6°C	0.2°C	70 mm	5.9	9 h 57	32	Good coverage
December	7.4°C	-3.7°C	87 mm	8	9 h 24	5	Good coverage

Records at SHARPSBURG 5 S, 1998–2022
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	22.8°C30 Jan 2002	-19.4°C25 Jan 2004	55 mm31 Jan 2013	137 mm1999 · driest 34 mm in 2008	20
February	26.7°C26 Feb 2000	-21.1°C20 Feb 2015	62 mm17 Feb 2003	172 mm2003 · driest 6 mm in 2002	19
March	29.4°C9 Mar 2000	-20.0°C6 Mar 2015	74 mm22 Mar 2019	147 mm2011 · driest 7 mm in 2006	24
April	34.4°C18 Apr 2002	-7.2°C4 Apr 2013	89 mm17 Apr 2011	212 mm2011 · driest 41 mm in 2016	24
May	35.0°C31 May 2006	-1.7°C14 May 2013	101 mm16 May 2014	216 mm2019 · driest 32 mm in 1999	23
June	37.2°C30 Jun 2012	2.2°C1 Jun 2001	81 mm26 Jun 2006	197 mm2015 · driest 9 mm in 2011	24
July	38.3°C30 Jul 2011	7.8°C8 Jul 2000	108 mm22 Jul 2018	202 mm2018 · driest 32 mm in 2010	24
August	37.2°C1 Aug 1999	7.8°C31 Aug 1999	80 mm27 Aug 2012	144 mm2018 · driest 6 mm in 2010	23
September	36.7°C3 Sep 2010	0.6°C20 Sep 2020	96 mm18 Sep 2004	266 mm2018 · driest 0 mm in 2013	24
October	33.9°C3 Oct 2019	-4.4°C30 Oct 2011	116 mm30 Oct 2012	213 mm2005 · driest 8 mm in 2000	24
November	28.9°C4 Nov 2003	-11.1°C19 Nov 2014	49 mm12 Nov 2020	192 mm2018 · driest 13 mm in 1998	24
December	26.7°C6 Dec 2001	-17.8°C24 Dec 2000	61 mm16 Dec 2018	176 mm2009 · driest 20 mm in 1998	22

Typical days per month at SHARPSBURG 5 S, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	25	2	4
February	<1	0	24	2	3
March	1	0	20	3	2
April	5	1	8	3	<1
May	14	4	<1	4	0
June	24	10	0	3	0
July	29	17	0	3	0
August	27	15	0	2	0
September	18	6	0	3	0
October	5	<1	4	3	<1
November	<1	0	17	3	0
December	<1	0	24	3	2

How often, not how much — every day in SHARPSBURG 5 S’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%	27%	7%	28%	2.1–7.7°C
February	2%	24%	7%	26%	3.1–9.6°C
March	12%	29%	8%	35%	9.0–15.0°C
April	29%	33%	10%	44%	16.2–20.3°C
May	53%	35%	12%	46%	20.9–26.1°C
June	67%	32%	12%	35%	26.8–29.2°C
July	72%	28%	12%	28%	28.5–32.5°C
August	74%	26%	8%	29%	27.4–31.1°C
September	69%	27%	11%	29%	24.4–28.6°C
October	43%	24%	9%	24%	17.9–21.8°C
November	13%	20%	9%	18%	10.6–16.6°C
December	3%	25%	9%	28%	4.5–11.7°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.

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4349107
NOAA station: USC00188207 · SHARPSBURG 5 S
Station distance: 13.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 17 usable years
Daylight: Calculated from latitude 39.51°, 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 SHARPSBURG 5 S is what differs

Brunswick→Shepherdstown→Lovettsville→Keedysville→Bolivar→Sharpsburg→

Or put two places side by side: Boonsboro vs Brunswick

Best time to visitBoonsboro.