United States · 1991–2020

Best time to visit
Old Brookville.

September leads for comfortable weather in Old Brookville: typically 24.4°C by day, 14.6°C at night, with 104 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24.4°C

Typical low14.6°C

Rain in September104 mm

Comfort

September

September · June · May

85climate match

Beach

July

July · August · June

77climate match

Outdoors

May

May · October · April

80climate match

The weakest month is January, scoring 5 against September’s 85 — days reach only 4.7°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

54.7° / -3.1°

Feb

56.1° / -2.7°

Mar

1210.2° / 0.9°

Apr

4416.2° / 5.8°

May

7221.5° / 10.5°

Jun

7926.4° / 15.9°

Jul

6329.2° / 18.8°

Aug

6728.5° / 18.3°

Sep

8524.4° / 14.6°

Oct

5718.5° / 8.6°

Nov

3413.1° / 4.4°

Dec

57.3° / -0.5°

Monthly climate evidence for Old Brookville — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 23 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	4.7°C	-3.1°C	92 mm	8.8	5.9°C	9 h 32	5	Good coverage
February	6.1°C	-2.7°C	74 mm	7.9	4.2°C	10 h 34	5	Good coverage
March	10.2°C	0.9°C	116 mm	8.8	4.7°C	11 h 49	12	Good coverage
April	16.2°C	5.8°C	98 mm	9	7.8°C	13 h 14	44	Good coverage
May	21.5°C	10.5°C	81 mm	8.8	12.5°C	14 h 26	72	Good coverage
June	26.4°C	15.9°C	91 mm	7.2	18.1°C	15 h 05	79	Good coverage
July	29.2°C	18.8°C	101 mm	7.5	22.2°C	14 h 50	63	Good coverage
August	28.5°C	18.3°C	93 mm	7	22.9°C	13 h 48	67	Good coverage
September	24.4°C	14.6°C	104 mm	6.7	21.3°C	12 h 25	85	Good coverage
October	18.5°C	8.6°C	104 mm	6.9	17.3°C	11 h 02	57	Good coverage
November	13.1°C	4.4°C	81 mm	7.6	12.7°C	9 h 51	34	Good coverage
December	7.3°C	-0.5°C	102 mm	8.9	9.0°C	9 h 15	5	Good coverage

Records at MINEOLA, 1938–2011
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	21.7°C6 Jan 2007	-20.0°C19 Jan 1994	103 mm3 Jan 1999	250 mm1979 · driest 16 mm in 1955	74
February	22.8°C27 Feb 1997	-20.6°C15 Feb 1943	61 mm7 Feb 1941	163 mm1939 · driest 19 mm in 1990	74
March	30.6°C29 Mar 1945	-15.0°C1 Mar 1980	82 mm6 Mar 1979	263 mm2010 · driest 30 mm in 2006	74
April	34.4°C17 Apr 2002	-10.6°C7 Apr 1982	95 mm9 Apr 1980	277 mm1983 · driest 28 mm in 2001	73
May	36.1°C20 May 1996	1.1°C10 May 1983	73 mm2 May 1989	311 mm1989 · driest 9 mm in 1964	71
June	38.3°C15 Jun 1988	6.1°C1 Jun 1945	109 mm30 Jun 1984	241 mm1984 · driest 0 mm in 1949	73
July	42.2°C6 Jul 2010	10.0°C5 Jul 1979	112 mm27 Jul 1942	258 mm1942 · driest 10 mm in 1939	72
August	40.6°C9 Aug 2001	7.8°C31 Aug 1976	208 mm12 Aug 1955	407 mm2011 · driest 6 mm in 2005	74
September	36.1°C2 Sep 1953	3.3°C20 Sep 1993	127 mm12 Sep 1960	320 mm1938 · driest 8 mm in 1941	74
October	31.7°C8 Oct 2007	-2.8°C19 Oct 1974	125 mm7 Oct 1972	400 mm2005 · driest 3 mm in 1963	72
November	28.3°C2 Nov 1950	-8.3°C26 Nov 1938	104 mm8 Nov 1977	256 mm1972 · driest 9 mm in 1976	72
December	24.4°C7 Dec 1998	-18.9°C21 Dec 1942	75 mm11 Dec 1992	228 mm1973 · driest 8 mm in 1955	73

Typical days per month at MINEOLA, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	22	3	2
February	0	0	21	3	2
March	<1	0	14	4	1
April	2	<1	2	3	<1
May	8	2	0	3	0
June	20	7	0	3	0
July	28	12	0	3	0
August	27	11	0	3	0
September	14	2	0	4	0
October	3	<1	<1	3	0
November	<1	0	6	3	<1
December	0	0	18	3	1

How often, not how much — every day in MINEOLA’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%	28%	10%	30%	0.4–6.3°C
February	<1%	28%	10%	32%	2.0–7.8°C
March	3%	30%	12%	35%	5.9–11.5°C
April	15%	29%	11%	34%	12.3–17.3°C
May	45%	29%	10%	35%	17.8–22.9°C
June	70%	26%	10%	25%	23.8–27.7°C
July	76%	24%	11%	23%	26.9–30.4°C
August	75%	25%	10%	22%	25.6–29.6°C
September	66%	22%	10%	20%	21.5–25.5°C
October	29%	21%	9%	19%	15.2–20.2°C
November	4%	26%	11%	27%	10.0–14.6°C
December	<1%	28%	10%	33%	3.1–8.7°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.

1938Each stripe is one year’s mean temperature against the 61-year average. Warmest: 2010. Coolest: 1940.2010

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5129665
NOAA station: USC00305377 · MINEOLA
Station distance: 11.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 18 usable years
Daylight: Calculated from latitude 40.83°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 23 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
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 MINEOLA is what differs

Hempstead→Hicksville→East Meadow→Franklin Square→Glen Cove→Uniondale→

Or put two places side by side: Old Brookville vs Hempstead

Best time to visitOld Brookville.

September

July

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Old Brookville.

The whole year,
without the guesswork.

Nearby, measured,
and named.