United States · 1991–2020

Best time to visit
Calcutta.

September leads for comfortable weather in Calcutta: typically 24.5°C by day, 13.2°C at night, with 100 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24.5°C

Typical low13.2°C

Rain in September100 mm

Comfort

September

September · June · August

82climate match

Beach

July

July · August · June

70climate match

Outdoors

October

October · May · September

76climate match

The weakest month is January, scoring 5 against September’s 82 — days reach only 2.6°C, 21° 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

52.6° / -5.4°

Feb

54.3° / -4.8°

Mar

129.7° / -1.1°

Apr

4317.1° / 4.2°

May

7022.3° / 10°

Jun

7526.5° / 14.8°

Jul

6628.4° / 17.4°

Aug

7327.8° / 16.6°

Sep

8224.5° / 13.2°

Oct

5618° / 7.3°

Nov

2210.9° / 1.5°

Dec

55.1° / -2.4°

Monthly climate evidence for Calcutta — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	2.6°C	-5.4°C	77 mm	10.4	9 h 33	5	Strong coverage
February	4.3°C	-4.8°C	62 mm	9	10 h 35	5	Strong coverage
March	9.7°C	-1.1°C	78 mm	9.5	11 h 49	12	Strong coverage
April	17.1°C	4.2°C	90 mm	10.7	13 h 14	43	Strong coverage
May	22.3°C	10°C	96 mm	10.7	14 h 25	70	Strong coverage
June	26.5°C	14.8°C	109 mm	9.8	15 h 04	75	Strong coverage
July	28.4°C	17.4°C	103 mm	9	14 h 49	66	Strong coverage
August	27.8°C	16.6°C	93 mm	7.5	13 h 47	73	Strong coverage
September	24.5°C	13.2°C	100 mm	7.7	12 h 25	82	Strong coverage
October	18°C	7.3°C	73 mm	8.6	11 h 03	56	Strong coverage
November	10.9°C	1.5°C	74 mm	8.4	9 h 51	22	Strong coverage
December	5.1°C	-2.4°C	74 mm	9.6	9 h 16	5	Strong coverage

What has changed

Calcutta runs -0.6°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

-0.6

Feb

-0.1

Mar

-0.8

Apr

-1.5

May

-1.4

Jun

-1.5

Jul

-0.7

Aug

-0.6

Sep

+0.2

Oct

-0.2

Nov

-1.2

Dec

+0.9

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

Records at MONTGOMERY L&D, 1962–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	21.7°C13 Jan 2005	-27.8°C21 Jan 1985	50 mm8 Jan 1998	154 mm2005 · driest 16 mm in 1967	65
February	24.4°C26 Feb 2000	-23.9°C16 Feb 2015	49 mm18 Feb 2022	138 mm2019 · driest 7 mm in 1978	65
March	27.8°C31 Mar 1998	-20.0°C2 Mar 1980	57 mm10 Mar 1964	151 mm2020 · driest 22 mm in 1986	65
April	32.2°C18 Apr 1976	-10.0°C8 Apr 1982	50 mm3 Apr 2024	202 mm2024 · driest 17 mm in 1971	65
May	34.4°C18 May 1962	-3.3°C11 May 1966	54 mm7 May 2022	218 mm2019 · driest 34 mm in 1964	65
June	40.6°C11 Jun 1983	1.1°C11 Jun 1972	68 mm26 Jun 2013	295 mm2019 · driest 21 mm in 1988	64
July	39.4°C8 Jul 1988	5.6°C13 Jul 2002	127 mm6 Jul 2007	230 mm1980 · driest 19 mm in 2002	65
August	37.8°C13 Aug 1988	3.9°C29 Aug 1982	83 mm9 Aug 1992	215 mm2007 · driest 17 mm in 2025	64
September	34.4°C10 Sep 1964	-1.1°C23 Sep 1974	222 mm18 Sep 2004	364 mm2004 · driest 8 mm in 2014	64
October	30.6°C4 Oct 2019	-7.2°C29 Oct 1965	63 mm30 Oct 2012	163 mm2006 · driest 3 mm in 1963	64
November	27.8°C4 Nov 1987	-20.6°C30 Nov 1976	75 mm19 Nov 2017	253 mm1985 · driest 18 mm in 2016	64
December	23.3°C4 Dec 1982	-22.8°C25 Dec 1983	76 mm1 Dec 2010	201 mm1990 · driest 17 mm in 1965	64

Typical days per month at MONTGOMERY L&D, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	24	2	3
February	0	0	23	2	2
March	<1	0	19	3	1
April	3	0	7	3	<1
May	11	1	<1	3	0
June	20	6	0	4	0
July	26	9	0	3	0
August	24	7	0	3	0
September	14	3	0	3	0
October	3	<1	1	2	0
November	<1	0	13	2	<1
December	0	0	22	3	2

How often, not how much — every day in MONTGOMERY L&D’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%	33%	7%	43%	-1.0–6.0°C
February	<1%	31%	7%	39%	1.4–8.3°C
March	10%	33%	9%	47%	7.2–13.7°C
April	27%	36%	10%	46%	14.9–19.7°C
May	51%	35%	11%	45%	20.1–25.6°C
June	67%	31%	11%	38%	25.2–28.7°C
July	72%	29%	11%	31%	27.1–30.7°C
August	75%	25%	10%	25%	26.4–29.4°C
September	68%	26%	9%	29%	22.7–26.3°C
October	33%	27%	7%	30%	16.1–19.9°C
November	6%	31%	8%	39%	8.1–13.8°C
December	<1%	33%	8%	44%	1.5–8.6°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.

1962Each stripe is one year’s mean temperature against the 62-year average. Warmest: 1998. Coolest: 2014.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5148883
NOAA station: USC00365902 · MONTGOMERY L&D
Station distance: 16.3 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude 40.67°, 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 MONTGOMERY L&D is what differs

Beaver Falls→New Brighton→Monaca→East Palestine→Beaver→Rochester→

Or put two places side by side: Calcutta vs Beaver Falls

Best time to visitCalcutta.