United States · 1991–2020

Best time to visit
New Castle.

September leads for comfortable weather in New Castle: typically 24.8°C by day, 11.1°C at night, with 79 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24.8°C

Typical low11.1°C

Rain in September79 mm

Comfort

September

September · August · June

81climate match

Beach

August

August · July · June

66climate match

Outdoors

October

October · September · May

73climate match

The weakest month is January, scoring 5 against September’s 81 — days reach only 0.9°C, 23° 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

50.9° / -8.1°

Feb

53.1° / -6.7°

Mar

79° / -2°

Apr

3616.2° / 3.5°

May

6422° / 9.7°

Jun

7126.4° / 14.7°

Jul

6828.1° / 16.1°

Aug

7727.6° / 15°

Sep

8124.8° / 11.1°

Oct

5318.2° / 5.2°

Nov

1410.1° / -0.3°

Dec

53.5° / -4.8°

Monthly climate evidence for New Castle — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	0.9°C	-8.1°C	76 mm	8.9	9 h 37	5	Strong coverage
February	3.1°C	-6.7°C	63 mm	7.7	10 h 37	5	Strong coverage
March	9°C	-2°C	87 mm	9.6	11 h 49	7	Strong coverage
April	16.2°C	3.5°C	113 mm	10.7	13 h 12	36	Strong coverage
May	22°C	9.7°C	123 mm	11.1	14 h 21	64	Strong coverage
June	26.4°C	14.7°C	135 mm	10.5	14 h 59	71	Strong coverage
July	28.1°C	16.1°C	119 mm	8.7	14 h 44	68	Strong coverage
August	27.6°C	15°C	86 mm	7.1	13 h 45	77	Strong coverage
September	24.8°C	11.1°C	79 mm	6.8	12 h 24	81	Strong coverage
October	18.2°C	5.2°C	81 mm	7.4	11 h 04	53	Strong coverage
November	10.1°C	-0.3°C	89 mm	8.3	9 h 55	14	Strong coverage
December	3.5°C	-4.8°C	77 mm	8.9	9 h 21	5	Strong coverage

What has changed

New Castle 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

+1.3

Mar

+1.2

Apr

+0.7

May

+0.6

Jun

-0.1

Jul

-0.5

Aug

-0.3

Sep

+0.8

Oct

+1.1

Nov

-0.1

Dec

+1.7

September daytime highs, 2011–2025. Last recorded: 27.2°C.

Records at NEW CASTLE 3 SW, 1949–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	22.2°C25 Jan 1950	-32.2°C20 Jan 1994	81 mm9 Jan 2008	292 mm1950 · driest 8 mm in 1981	77
February	23.9°C21 Feb 2018	-28.3°C4 Feb 1985	66 mm25 Feb 1956	156 mm2011 · driest 3 mm in 1968	77
March	30.0°C23 Mar 2026	-22.8°C10 Mar 1984	72 mm5 Mar 2011	176 mm1963 · driest 22 mm in 2001	77
April	31.7°C25 Apr 1960	-11.1°C17 Apr 1983	86 mm20 Apr 2011	285 mm2011 · driest 11 mm in 1962	77
May	33.9°C28 May 2018	-4.4°C9 May 2020	81 mm30 May 1991	252 mm2011 · driest 29 mm in 1964	77
June	41.7°C29 Jun 2012	3.3°C1 Jun 2025	99 mm18 Jun 1992	287 mm2010 · driest 13 mm in 2012	77
July	38.9°C7 Jul 2012	6.7°C1 Jul 1995	105 mm24 Jul 1992	346 mm1992 · driest 26 mm in 1974	76
August	37.8°C19 Aug 1988	3.3°C29 Aug 1965	98 mm31 Aug 2005	251 mm1979 · driest 17 mm in 1964	76
September	38.3°C2 Sep 1953	-2.8°C18 Sep 1959	88 mm7 Sep 1971	202 mm1971 · driest 5 mm in 1963	76
October	33.9°C1 Oct 2019	-7.8°C25 Oct 1960	86 mm1 Oct 1977	224 mm1986 · driest 2 mm in 1963	76
November	27.8°C1 Nov 1950	-23.3°C30 Nov 1958	64 mm16 Nov 1955	213 mm1985 · driest 7 mm in 1976	74
December	22.2°C3 Dec 1982	-29.4°C22 Dec 1989	87 mm22 Dec 2013	191 mm1990 · driest 7 mm in 1958	77

Typical days per month at NEW CASTLE 3 SW, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	27	3	5
February	0	0	25	2	4
March	<1	0	21	3	2
April	3	0	9	4	<1
May	11	2	<1	4	0
June	20	7	0	4	0
July	27	9	0	4	0
August	25	7	0	3	0
September	16	5	<1	3	0
October	5	<1	6	3	<1
November	<1	0	17	3	<1
December	0	0	25	3	3

How often, not how much — every day in NEW CASTLE 3 SW’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%	26%	7%	30%	-2.4–4.3°C
February	<1%	26%	8%	28%	-0.6–6.8°C
March	6%	30%	9%	37%	5.9–12.7°C
April	21%	34%	12%	45%	13.9–18.8°C
May	47%	33%	13%	43%	19.7–25.3°C
June	66%	31%	13%	37%	24.9–29.0°C
July	73%	27%	12%	30%	27.0–31.6°C
August	76%	24%	9%	22%	26.7–30.0°C
September	68%	22%	8%	20%	22.8–27.2°C
October	34%	24%	8%	27%	16.2–21.0°C
November	6%	28%	10%	30%	6.9–13.2°C
December	<1%	28%	8%	33%	0.3–7.0°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.

1950Each stripe is one year’s mean temperature against the 73-year average. Warmest: 1952. Coolest: 2014.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4262072
NOAA station: USC00126164 · NEW CASTLE 3 SW
Station distance: 4.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 39.93°, 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 NEW CASTLE 3 SW is what differs

Knightstown→Spiceland→Shirley→Kennard→Sulphur Springs→Lewisville→

Or put two places side by side: New Castle vs Knightstown

Best time to visitNew Castle.