United States · 1991–2020

Best time to visit
Old Tappan.

September leads for comfortable weather in Old Tappan: typically 24.6°C by day, 13.1°C at night, with 134 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24.6°C

Typical low13.1°C

Rain in September134 mm

Comfort

September

September · June · May

76climate match

Beach

July

July · August · June

71climate match

Outdoors

May

May · October · April

72climate match

The weakest month is January, scoring 5 against September’s 76 — days reach only 4.2°C, 20° 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

54.2° / -4.9°

Feb

56° / -4.3°

Mar

1110.6° / -0.5°

Apr

4117.1° / 4.3°

May

7122.6° / 9.6°

Jun

7227.1° / 14.8°

Jul

6229.4° / 17.7°

Aug

6728.7° / 17.2°

Sep

7624.6° / 13.1°

Oct

5118.4° / 6.7°

Nov

2512.4° / 2.4°

Dec

56.7° / -2.4°

Monthly climate evidence for Old Tappan — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 44 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	4.2°C	-4.9°C	98 mm	8.5	6.0°C	9 h 31	5	Good coverage
February	6°C	-4.3°C	76 mm	6.9	4.3°C	10 h 34	5	Good coverage
March	10.6°C	-0.5°C	120 mm	8.9	4.8°C	11 h 49	11	Good coverage
April	17.1°C	4.3°C	113 mm	9.8	7.9°C	13 h 15	41	Good coverage
May	22.6°C	9.6°C	98 mm	9.7	12.6°C	14 h 27	71	Good coverage
June	27.1°C	14.8°C	117 mm	9.3	18.1°C	15 h 06	72	Good coverage
July	29.4°C	17.7°C	107 mm	8.4	22.2°C	14 h 51	62	Good coverage
August	28.7°C	17.2°C	105 mm	7.6	23.1°C	13 h 48	67	Good coverage
September	24.6°C	13.1°C	134 mm	7.8	21.4°C	12 h 25	76	Good coverage
October	18.4°C	6.7°C	116 mm	7.4	17.3°C	11 h 02	51	Good coverage
November	12.4°C	2.4°C	100 mm	7.9	12.7°C	9 h 50	25	Good coverage
December	6.7°C	-2.4°C	116 mm	9.1	9.0°C	9 h 14	5	Good coverage

Records at DOBBS FERRY-ARDSLEY, 1945–2012
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	22.8°C26 Jan 1950	-23.3°C27 Jan 1994	95 mm21 Jan 1979	312 mm1979 · driest 15 mm in 1970	67
February	23.9°C24 Feb 1985	-20.6°C8 Feb 1963	81 mm2 Feb 1973	192 mm1981 · driest 22 mm in 1987	67
March	30.0°C31 Mar 1998	-16.7°C19 Mar 1967	109 mm13 Mar 1953	278 mm2010 · driest 17 mm in 2006	67
April	35.6°C17 Apr 2002	-8.3°C7 Apr 1982	136 mm5 Apr 1984	307 mm2007 · driest 26 mm in 1985	66
May	36.1°C20 May 1996	-1.7°C14 May 1996	138 mm29 May 1968	365 mm1946 · driest 16 mm in 1993	65
June	37.2°C26 Jun 1952	3.3°C1 Jun 2001	145 mm19 Jun 1972	394 mm1972 · driest 9 mm in 1949	67
July	40.0°C21 Jul 1980	7.2°C8 Jul 2009	83 mm23 Jul 1946	254 mm1984 · driest 13 mm in 1999	63
August	38.9°C26 Aug 1948	6.7°C29 Aug 1982	121 mm13 Aug 1955	317 mm1955 · driest 12 mm in 1964	63
September	38.3°C2 Sep 1953	0.6°C28 Sep 1947	194 mm16 Sep 1999	361 mm1999 · driest 24 mm in 1948	64
October	31.7°C10 Oct 1949	-2.8°C30 Oct 1990	110 mm15 Oct 1955	412 mm2005 · driest 9 mm in 1963	65
November	27.8°C1 Nov 1950	-11.1°C24 Nov 1989	133 mm8 Nov 1977	250 mm1972 · driest 13 mm in 1976	66
December	25.0°C7 Dec 1998	-20.0°C25 Dec 1980	82 mm21 Dec 1973	283 mm1983 · driest 15 mm in 1955	67

Typical days per month at DOBBS FERRY-ARDSLEY, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	26	3	5
February	0	0	23	3	4
March	<1	0	18	4	3
April	3	<1	6	4	<1
May	10	3	<1	3	0
June	22	8	0	4	0
July	27	15	0	3	0
August	27	12	0	3	0
September	15	3	0	4	0
October	3	<1	2	3	0
November	<1	0	11	4	<1
December	0	0	22	4	3

How often, not how much — every day in DOBBS FERRY-ARDSLEY’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%	29%	10%	35%	0.2–6.4°C
February	<1%	28%	10%	32%	1.8–8.4°C
March	5%	31%	12%	37%	7.5–12.4°C
April	22%	33%	12%	43%	14.8–18.5°C
May	53%	33%	11%	43%	20.0–24.7°C
June	68%	30%	11%	35%	25.0–28.6°C
July	72%	28%	11%	32%	27.8–31.3°C
August	73%	27%	10%	29%	26.8–30.0°C
September	66%	24%	11%	25%	22.6–25.8°C
October	31%	23%	10%	24%	16.4–20.5°C
November	4%	29%	13%	33%	9.8–14.1°C
December	<1%	30%	12%	37%	2.6–8.6°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.

1946Each stripe is one year’s mean temperature against the 61-year average. Warmest: 1949. Coolest: 1992.2009

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5102190
NOAA station: USC00302129 · DOBBS FERRY-ARDSLEY
Station distance: 13.2 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 18 usable years
Daylight: Calculated from latitude 41.01°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 44 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 DOBBS FERRY-ARDSLEY is what differs

Yonkers→Greenburgh→New City→Spring Valley→Eastchester→Mamaroneck→

Or put two places side by side: Old Tappan vs Yonkers

Best time to visitOld Tappan.

September

July

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Old Tappan.

The whole year,
without the guesswork.

Nearby, measured,
and named.