United States · 1991–2020

Best time to visit
Sleepy Hollow.

September leads for comfortable weather in Sleepy Hollow: typically 23.7°C by day, 7.4°C at night, with 32 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high23.7°C

Typical low7.4°C

Rain in September32 mm

Comfort

September

September · June · August

84climate match

Beach

August

August · July · June

73climate match

Outdoors

September

September · June · May

82climate match

The weakest month is January, scoring 5 against September’s 84 — days reach only 1.9°C, 22° below the 24°C the score treats as ideal, and nights drop to -9.7°C.

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

51.9° / -9.7°

Feb

53° / -8.9°

Mar

149.2° / -4.5°

Apr

2913.3° / -0.6°

May

5118.5° / 4.6°

Jun

7925.1° / 9.7°

Jul

7330.1° / 13.4°

Aug

7629.5° / 12.7°

Sep

8423.7° / 7.4°

Oct

4115.1° / 0.7°

Nov

97.6° / -5.1°

Dec

52.1° / -9.2°

Monthly climate evidence for Sleepy Hollow — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	1.9°C	-9.7°C	15 mm	4.5	9 h 12	5	Strong coverage
February	3°C	-8.9°C	20 mm	4.7	10 h 23	5	Strong coverage
March	9.2°C	-4.5°C	28 mm	5.4	11 h 47	14	Strong coverage
April	13.3°C	-0.6°C	54 mm	7.9	13 h 23	29	Strong coverage
May	18.5°C	4.6°C	81 mm	9.8	14 h 45	51	Strong coverage
June	25.1°C	9.7°C	62 mm	7.8	15 h 29	79	Strong coverage
July	30.1°C	13.4°C	44 mm	6.4	15 h 12	73	Strong coverage
August	29.5°C	12.7°C	35 mm	4.8	14 h 01	76	Strong coverage
September	23.7°C	7.4°C	32 mm	4.4	12 h 27	84	Strong coverage
October	15.1°C	0.7°C	40 mm	6	10 h 55	41	Strong coverage
November	7.6°C	-5.1°C	16 mm	3.7	9 h 33	9	Strong coverage
December	2.1°C	-9.2°C	16 mm	4.8	8 h 53	5	Strong coverage

What has changed

Sleepy Hollow runs +1.6°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

+2.7

Feb

-0.5

Mar

+3.2

Apr

+0.7

May

+0.2

Jun

+1.8

Jul

+1.3

Aug

+1.1

Sep

+3.2

Oct

+0.5

Nov

+2.3

Dec

+2.4

September daytime highs, 2011–2025. Last recorded: 26.7°C.

Records at GILLETTE 3SE, 1902–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	19.4°C23 Jan 1981	-37.8°C17 Jan 1930	18 mm14 Jan 1943	61 mm1943 · driest 0 mm in 1949	113
February	21.1°C21 Feb 1982	-40.0°C8 Feb 1936	33 mm25 Feb 1998	42 mm1998 · driest 0 mm in 1952	115
March	27.8°C21 Mar 2026	-30.6°C3 Mar 1960	41 mm22 Mar 1933	67 mm1929 · driest 0 mm in 1953	116
April	32.8°C24 Apr 1910	-24.4°C2 Apr 1936	62 mm30 Apr 1993	121 mm1999 · driest 2 mm in 1908	115
May	35.0°C28 May 1934	-11.7°C3 May 1954	82 mm18 May 1978	282 mm1978 · driest 1 mm in 1936	113
June	41.7°C24 Jun 2012	-2.2°C14 Jun 1969	104 mm22 Jun 1964	254 mm1964 · driest 3 mm in 1961	117
July	43.3°C17 Jul 1909	1.7°C31 Jul 1968	84 mm15 Jul 1915	195 mm1915 · driest 0 mm in 1917	117
August	41.1°C7 Aug 1949	-0.6°C25 Aug 1917	83 mm15 Aug 1912	117 mm1923 · driest 0 mm in 1937	113
September	38.9°C5 Sep 1978	-12.2°C25 Sep 1926	54 mm28 Sep 1923	121 mm1923 · driest 0 mm in 1952	114
October	36.7°C3 Oct 1922	-24.4°C28 Oct 1925	55 mm6 Oct 1994	172 mm1994 · driest 0 mm in 1965	114
November	27.2°C6 Nov 1908	-32.2°C16 Nov 1959	23 mm13 Nov 1964	58 mm1947 · driest 0 mm in 1954	114
December	22.2°C1 Dec 2021	-38.3°C24 Dec 1983	29 mm17 Dec 1908	58 mm1909 · driest 0 mm in 1930	113

Typical days per month at GILLETTE 3SE, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	29	<1	7
February	0	0	26	<1	6
March	<1	0	25	<1	5
April	1	0	17	1	4
May	5	<1	6	3	<1
June	16	6	<1	2	<1
July	27	18	0	1	0
August	26	17	0	<1	0
September	15	6	2	<1	<1
October	3	<1	14	1	2
November	0	0	24	<1	4
December	0	0	29	<1	6

The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 81); on 2011–2025 it is September (82). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in GILLETTE 3SE’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%	13%	<1%	7%	-3.9–4.5°C
February	0%	14%	<1%	8%	-1.8–6.3°C
March	4%	16%	2%	12%	3.2–11.6°C
April	19%	23%	4%	23%	10.2–16.6°C
May	40%	27%	7%	33%	15.8–21.4°C
June	66%	26%	7%	27%	21.2–27.7°C
July	81%	18%	4%	14%	27.9–32.7°C
August	84%	14%	3%	9%	26.5–32.1°C
September	68%	15%	4%	12%	20.2–27.3°C
October	34%	16%	3%	11%	12.7–19.3°C
November	3%	13%	<1%	8%	3.1–11.7°C
December	<1%	14%	<1%	8%	-2.3–5.3°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.

1905Each stripe is one year’s mean temperature against the 99-year average. Warmest: 2012. Coolest: 1993.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5838617
NOAA station: USC00483855 · GILLETTE 3SE
Station distance: 4.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 28 usable years
Daylight: Calculated from latitude 44.23°, 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 GILLETTE 3SE is what differs

Gillette→Antelope Valley-Crestview→Pleasantdale→Rozet→Wyodak→Antelope Valley→

Or put two places side by side: Sleepy Hollow vs Gillette

Best time to visitSleepy Hollow.

September

August

September

The whole year,without the guesswork.

Sleepy Hollow runs +1.6°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Sleepy Hollow.

The whole year,
without the guesswork.

Sleepy Hollow runs +1.6°C
on the 1961–1990 baseline.

Nearby, measured,
and named.