Along the Coastal Plain and in much of the Piedmont, summers are generally hot, and winters are mild. The relative humidity is generally high throughout the year. In the mountains, in northern Georgia, cooler conditions prevail.
The average January temperature on the Coastal Plain and the Piedmont ranges from about 7° C (about 44° F) in the north to about 12° C (54° F) in the south. In the mountains, winter temperatures are in the middle single digits C (lower 40°s F) in the valleys and considerably lower on the hills and more exposed mountain slopes. Occasionally in winter masses of colder air sweep into Georgia from the north. On such occasions, temperatures have dropped to the lower 20°s C (lower 10°s F). Average July temperatures are in the upper 20°s C (lower 80°s F) on the Coastal Plain and the Piedmont, and range from about 23° to 26° C (about 74° to 78° F) in the mountains. Daytime temperatures are often in the upper 30°s C (lower 100°s F) and have risen occasionally to the middle 40°s Celsius (lower 110°s F). The high humidity makes very hot days exceedingly uncomfortable.
The Coastal Plain and Piedmont receive between 1,170 and 1,320 mm (46 and 52 in) of precipitation (both rainfall and snowfall) a year, and the mountains receive between 1,420 and 1,930 mm (56 and 76 in). However, the amount of precipitation varies greatly from year to year, and prolonged dry spells, although infrequent, occasionally cause crop failures and water shortages. More than half of all annual precipitation falls during the spring and summer. Snow is rare in the lowlands, but there are sometimes heavy snowfalls in the mountains.
The growing season, or period between the last killing frost in the spring and the first killing frost in the fall, may range from more than 300 days in some of the Sea Islands to fewer than 190 days in the northern mountain valleys. The last spring frost usually occurs at the end of February along the southeastern coast and in the middle of April in the northern mountain valleys. The first autumn frost may be expected around the end of September in the north and around the beginning of December along the coast. © "United States" © Emmanuel Buchot and Encarta
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