The population was 5,586 at the 2000 census and 5,764 at the 2010 census. Sweetwater is the home of the Craighead Caverns which contains the Lost Sea, the United States' largest underground lake.
2011, The HOTTEST Year for Texas. Tweet. For most of Texas, 2011 is now the hottest year on record while city after city shatter records of 100 degree days. Texas is in a severe drought, only averaging about 1 inch of rain during July, and in many areas things are becoming desperate.
Click on the image above to see a larger version. The coolest zone indicated by the Texas USDA planting map is 6b, located in the northern part of the state. The rest of Texas enjoys a very warm climate year round, including the winter months. The remaining Texas zones include 7a, 7b, 8a, 8b and 9a. Winter lows may drop down to -5 degrees F. or be as warm as 20 degrees F., depending on your location in the state. Gardeners rely on the zone information presented in the Texas planting map as featured above.