What is the hottest month in Castalia?

July is the warmest month in Castalia, with an average high of 90.2°F.

What is the coldest month in Castalia?

January is the coldest month in Castalia, with an average low of 27.5°F.

What month does Castalia get the most rain?

August is typically the wettest month in Castalia, with about 5.51 inches of precipitation.

What plant hardiness zone is Castalia in?

Castalia is approximately in USDA plant hardiness Zone 8a, based on the average annual extreme minimum temperature.

Has the climate in Castalia changed recently?

8.2% of Castalia's all-time daily heat records were set in the last decade (since 2015), compared to roughly 5% if records were evenly distributed over time.

Castalia, NC

Climate overview — based on NOAA 1991-2020 normals from LOUISBURG, NC US.

Cfa Humid subtropical climate 8a USDA hardiness Zone 8a

Year-round temperatures (°F)

Avg high Avg low

Climate summary

Castalia has an annual average temperature of 59.1°F with about 48.3 inches of precipitation per year and 1.7 inches of snow. The warmest month is July (average high 90.2°F), and the coldest is January (average low 27.5°F). August is typically the wettest month (5.51 in) and February the driest (2.86 in). Snow typically falls from December through March.

Pleasant months

1 / 12

avg high 65–80°F, low ≥ 50°F

Annual swing

39.7°F

warmest to coldest month

Heating need

3,438

HDD/yr

Cooling need

1,329

CDD/yr

Best time to visit Castalia

Full guide →

Climate change signal

All-time records →

30 of 366 (8.2%) of Castalia's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.

1890s		16
1900s		7
1910s		23
1920s		19
1930s		68
1940s		66
1950s		50
1960s		10
1970s		18
1980s		21
1990s		17
2000s		18
2010s		20
2020s		13

Bars: number of all-time daily heat records still standing that were set in each decade.

Monthly averages

Month	Avg High	Avg Low	Avg Temp	Precipitation	Snow	Rainy days
January	51.6°F	27.5°F	39.5°F	3.74 in	0.9 in	10
February	55.0°F	29.5°F	42.2°F	2.86 in	0.4 in	9
March	62.7°F	35.5°F	49.1°F	4.06 in	0.2 in	10
April	72.4°F	44.2°F	58.3°F	3.48 in	—	9
May	79.3°F	54.1°F	66.7°F	3.71 in	—	10
June	86.7°F	63.1°F	74.9°F	4.70 in	—	10
July	90.2°F	68.1°F	79.2°F	4.85 in	—	10
August	88.5°F	66.2°F	77.3°F	5.51 in	—	9
September	82.6°F	59.9°F	71.2°F	4.91 in	—	8
October	72.8°F	46.4°F	59.6°F	3.56 in	—	7
November	62.8°F	35.4°F	49.1°F	3.43 in	—	8
December	54.6°F	30.5°F	42.6°F	3.48 in	0.2 in	10