New Castle weather by month
What a typical year looks like in New Castle, Indiana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at NEW CASTLE 3 SW, 4 km from New Castle; records cover 1949–2026.
The year at a glance
- Precipitation a year
- 44.3 in1126 mm
- Snow a year
- 25 in63 cm
- Last spring freeze
- Apr 28
- First fall freeze
- Oct 15
- Heating degree days
- 6,018
- Cooling degree days
- 735
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −5°−21° (heating, 99%) and 92°33° (cooling, 1%).
Month by month
New Castle in January
Highs average 34°1° and lows 17°−8°, with 3 in76 mm of precipitation and 8 in20 cm of snow in a typical January.
- Record high
- 72°22° (1950)
- Record low
- −26°−32° (1994)
- Heating degree days
- 1221
- Cooling degree days
- 0
New Castle in February
Highs average 38°3° and lows 19°−7°, with 2.5 in62 mm of precipitation and 6 in16 cm of snow in a typical February.
- Record high
- 75°24° (2018)
- Record low
- −19°−28° (1951)
- Heating degree days
- 1016
- Cooling degree days
- 0
New Castle in March
Highs average 49°9° and lows 28°−2°, with 3.4 in86 mm of precipitation and 3 in9 cm of snow in a typical March.
- Record high
- 86°30° (2026)
- Record low
- −9°−23° (1960)
- Heating degree days
- 826
- Cooling degree days
- 1
New Castle in April
Highs average 62°17° and lows 38°4°, with 4.4 in112 mm of precipitation and 0.3 in0.8 cm of snow in a typical April.
- Record high
- 89°32° (1960)
- Record low
- 12°−11° (1957)
- Heating degree days
- 454
- Cooling degree days
- 6
New Castle in May
Highs average 72°22° and lows 50°10°, with 4.9 in123 mm of precipitation in a typical May.
- Record high
- 93°34° (1962)
- Record low
- 24°−4° (2020)
- Heating degree days
- 184
- Cooling degree days
- 58
New Castle in June
Highs average 80°27° and lows 59°15°, with 5.3 in136 mm of precipitation in a typical June.
- Record high
- 107°42° (2012)
- Record low
- 38°3° (1956)
- Heating degree days
- 32
- Cooling degree days
- 164
New Castle in July
Highs average 83°28° and lows 61°16°, with 4.7 in119 mm of precipitation in a typical July.
- Record high
- 102°39° (2012)
- Record low
- 44°7° (1995)
- Heating degree days
- 7
- Cooling degree days
- 225
New Castle in August
Highs average 82°28° and lows 59°15°, with 3.4 in86 mm of precipitation in a typical August.
- Record high
- 100°38° (1951)
- Record low
- 38°3° (1964)
- Heating degree days
- 12
- Cooling degree days
- 181
New Castle in September
Highs average 77°25° and lows 52°11°, with 3.1 in78 mm of precipitation in a typical September.
- Record high
- 101°38° (1953)
- Record low
- 27°−3° (1959)
- Heating degree days
- 99
- Cooling degree days
- 87
New Castle in OctoberThis month
Highs average 65°18° and lows 41°5°, with 3.2 in82 mm of precipitation in a typical October.
- Record high
- 93°34° (2019)
- Record low
- 18°−8° (1960)
- Heating degree days
- 382
- Cooling degree days
- 13
New Castle in November
Highs average 51°10° and lows 31°−1°, with 3.5 in88 mm of precipitation and 0.9 in2.3 cm of snow in a typical November.
- Record high
- 82°28° (1950)
- Record low
- −10°−23° (1958)
- Heating degree days
- 726
- Cooling degree days
- 0
New Castle in December
Highs average 39°4° and lows 23°−5°, with 3 in77 mm of precipitation and 6 in15 cm of snow in a typical December.
- Record high
- 72°22° (1982)
- Record low
- −21°−29° (1989)
- Heating degree days
- 1059
- Cooling degree days
- 0