This may be great weather for weekend fun, but a continued lack of rainfall has state and federal officials worried about a return of drought conditions, after two wet winters. It hasn’t rained a drop here for more than a month, and none is forecast for the rest of the month. In Hollister, rainfall this winter is less than half the October-February average—about 4 inches since Oct. 1. In Gilroy and Morgan Hill, less than 4 inches of rain has been recorded since Oct.1, which is barely 25 percent of the normal rainfall for the South County.