New Castle has chilly, snowy winters and warm summers, with plenty of rain. A typical July afternoon reaches 84°, a January night drops to 21°, and about 34 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normalsUpdated once a decade
☀️
July high
84°
262nd hottest of 2,223 New York towns
❄️
January low
21°
368th mildest of 2,223 New York towns
💧
Rain + melted snow
49 in
147th wettest of 2,223 New York towns
🌨️
Snow a winter
34 in
413th least snowy of 2,158 New York towns
A normal year
What a year in New Castle feels like
❄️
Winter
40° / 23°
Typical high / low · 10 days with an inch or more of snow
🌷
Spring
60° / 39°
Typical high / low · Last frost around Apr 12
☀️
Summer
82° / 62°
Typical high / low · 10 days reach 90° in a normal year
🍂
Fall
64° / 45°
Typical high / low · First frost around Oct 31
10°
20°
40°
50°
60°
70°
80°
90°
100°
32°
37°
21°
40°
22°
49°
29°
61°
39°
71°
49°
79°
58°
84°
64°
83°
62°
75°
55°
64°
44°
52°
35°
42°
27°
JanJFebFMarMAprAMayMJunJJulJAugASepSOctONovNDecD
32°, freezingBar runs from the typical overnight low up to the afternoon high
Best months to be outsideMayJunAugSepOctHighs of 62–84° and lows of 40° or more
Month by month
New Castle weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
Month
High
Low
Rain + melt
Snow
Wet days
30-yr range
January
37°
21°
3.4"
9.1"
11
21° – 36°
February
40°
22°
2.8"
11.9"
8
19° – 37°
March
49°
29°
4.0"
5.9"
10
33° – 48°
April
61°
39°
4.1"
0.5"
12
45° – 54°
May
71°
49°
4.0"
0
12
56° – 65°
June
79°
58°
4.6"
0
12
66° – 72°
July
84°
64°
4.6"
0
9
69° – 78°
August
83°
62°
4.4"
0
9
68° – 76°
September
75°
55°
4.6"
0
9
62° – 70°
October
64°
44°
4.6"
0
10
50° – 61°
November
52°
35°
3.6"
0.8"
10
39° – 48°
December
42°
27°
4.0"
5.8"
11
27° – 45°
Year
62°
42°
48.6"
34.0"
124
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain & snow
Rain and snow in New Castle
New Castle gets 49 inches of rain and melted snow a year. July is the wettest month and February the driest. Rain or snow falls on about 124 days a year.
💧
49 in
Rain + melted snow a year
More rain than 84% of U.S. towns
❄️
34 in
Snow in a normal winter
More snow than 62% of U.S. towns
☔
124 days
With rain or snow (0.01"+)
Rain + melted snow by month
Inches of water
4.6"
JFMAMJJASOND
Snowfall by month
Inches of snow
12"
JFMAMJJASOND
Frost & the growing season
About 200 frost-free days a year
In half of years the last 32° night comes by April 12 and the first one by October 31. That leaves about 200 frost-free days for gardens, longer than 72% of U.S. towns.
🌱 Apr 12
🍂 Oct 31
200 frost-free days
JFMAMJJASOND
🥶
105
nights at or below 32° in a normal year
🧊
<1
nights below 0° in a normal year
🔥
10
days that reach 90° in a normal year
Freezing nights by month
Average nights at or below 32°
JFMAMJJASOND
90° days by month
Average days at 90° or more
JFMAMJJASOND
Heating & cooling
Heating and cooling a home in New Castle
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In New Castle, 87% of that work is heating and 13% is cooling, so the furnace matters far more than the air conditioner.
🔥
5,492 heating degree daysLess heating than 56% of U.S. towns
❄️
787 cooling degree daysLess cooling than 55% of U.S. towns
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Around New Castle
New Castle and its neighbors
New Castle borders 8 towns with climate data. January nights across them vary by 2.3°. Somers has the coldest January nights (20°) and Ossining the hottest July afternoons (85°). New Castle’s January low is 21° and its July high 84°.
Compared with every U.S. town and city on TownTapestry, each counted once.
Then and now
Warmer than it used to be
+2.1°1991–2020 average vs. the 20th century (1901–2000)
The last 30 years in New Castle averaged 2.1° warmer than the 1900s. The biggest change is in December (+3.6°). The shift is larger than in 96% of U.S. towns.
❄️ Winter+3.1°now 32°, was 28°
🌷 Spring+1.7°now 50°, was 48°
☀️ Summer+1.8°now 72°, was 70°
🍂 Fall+1.7°now 54°, was 52°
Change by month1991–2020 average minus 1901–2000 average, at New Castle’s spot on NOAA’s grid
+1.2°
+3.6°
JanJFebFMarMAprAMayMJunJJulJAugASepSOctONovNDecD
Year to year
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 19° to 37°. June is the most reliable, staying within 6°.
10°
20°
30°
40°
50°
60°
70°
80°
90°
JanJFebFMarMAprAMayMJunJJulJAugASepSOctONovNDecD
Coldest to warmest month in 30 yearsNormal
Questions
Common questions about New Castle’s climate
What is the coldest month in New Castle?
January, with a typical high of 37° and a low of 21°.
What is the hottest month in New Castle?
July, with a typical high of 84° and a low of 64°. About 10 days a year reach 90°.
How much snow does New Castle get?
About 34 inches in a normal winter, most of it in February.
When is the first frost in New Castle?
In half of years the first 32° night comes by October 31, and the last spring frost by April 12.
What is the rainiest month in New Castle?
July, with 4.6 inches of rain and melted snow. The year totals 49 inches.
📍Temperatures and rainfall come from NOAA’s gridded climate normals for New Castle itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Stamford 5 N, CT (12 mi, snow) and Westchester Co Airport, NY (9 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.