Climate

The Chester County area offers residents a temperate climate that allows for year-round outdoor activities. The region's normal summer humidity is 74% and yearly morning humidity averages 83%, 54% during evening hours.

Rainfall is distributed evenly throughout the year with an average annual precipitation of 43.1 inches (107.5 cm). The summer months host the heaviest rainfall, March is the wettest month with approximately 4.8 inches (12.2cm) and October is the driest month with only 2.7 inches (6.9cm) of rainfall. Some snowfall does occur during winter months on occasion but not in amounts that disrupt travel or work schedules. Severe weather, such as hurricanes and tornadoes is a rarity in Chester County. The area is located outside principal tornado zones and the typical path of hurricanes along the Atlantic coastline is such that storm centers are usually at sea by the time storms reach this latitude. The few storms that pass close to the North Carolina-South Carolina have little adverse effect on Chester County.

Chester County Climate Data
Yearly Average Precipitation	43.1"
Yearly Average Temperature	60.1°F
Yearly Average High Temperature	71.0°F
Yearly Average Low Temperature	50.1°F
Early Freeze	November 7
Late Freeze	March 30

Winter

The area's winter offers you a taste of the old man, without all the shoveling, swerving and salt. Only half of the winter days fall below freezing, and below zero (-18° C.) temperatures have only occurred five times since 1878.

Snow is infrequent, with an average annual accumulation of less than six inches, but the area is only three hours away from excellent snow skiing in the North Carolina Mountains. Residents can enjoy the snow, without having to endure it.

Summer

The summer months lure residents outside. The bright sun and clear skies, dappled with pure white clouds, fill the summer days. Unlike cities to the south, very hot weather conditions (90° F, 32° C) occur only 36 days in the Chester County area. On the average, temperatures reach 100°F (38°C) only twice a year. And with an average summer temperature of 76°F (24° C) with an average daily range of 20 degrees, these inviting days are punctuated by cool nights under starry skies.

Spring and Autumn

The transformations of the seasons in the Chester County area are the most breathtaking times of the year. The slow emergence of spring, from mid-March through May, provides residents with a visual extravaganza. The Carolina blue skies accentuate the pinks, reds, yellows, purples and soft whites of the spring blooms that fill the city. Those same skies, crisp and clear, provide the setting for the brilliant array of colors which paint the trees during a fall which extends well into November. Both seasons are appreciably long, providing a slow, enjoyable gateway into summer or winter. The average frost free season lasts 216 days from mid-March to mid-November. October and November welcome the cool temperatures which invite people outside to enjoy those brilliant fall colors which rival those of New England, but are unknown in the deep south.

Normal Temperatures , Highs, Lows, and Precipitation
City	Max/ Min Deg. F. (January)	Max/Min Deg. F. (July)	Annual Precipitation (in.)
Atlanta	51/33	88/69	48.6
Baltimore	41/24	87/67	41.8
Boston	36/23	82/65	43.1
Charlotte	50/31	88/69	43.1
Chicago	29/14	83/63	33.3
Cincinnati	29/14	86/65	40.1
Cleveland	37/20	82/61	35.4
Denver	33/19	88/59	15.3
Detroit	43/16	83/61	30.9
Houston	31/16	94/73	44.8
Indianapolis	62/41	85/65	39.1
Kansas City	34/18	93/70	28.6
Los Angeles	40/19	84/64	14.8
Memphis	67/48	90/69	48.5
Miami	46/28	89/76	57.5
Milwaukee	75/59	80/61	30.9
Minneapolis	26/11	83/63	26.3
New Orleans	20/2	91/74	59.7
New York	62/43	84/69	42.8
Philadelphia	39/24	86/67	41.4
Phoenix	65/39	105/80	7.1
Portland	44/34	80/56	37.4
St. Louis	38/20	89/69	33.9
San Francisco	55/42	71/53	19.7
Seattle	44/34	75/54	38.6
Washington, DC	43/28	88/70	39.0
Source: National Climatic Data Center - U.S. Dept. of Commerce - 30 year averages for 1960 -1990. * Largest city within MSAs with over $15 billion in wholesale sales -- data unavailable for 3 cities.