Custom Search     Little Sullivan Lake     Little Sullivan Lake is pretty dehydrated regularly. The month with most of the snow is December, and the driest month of the year is July. The warmest time of the year brings highs in the 80's to Little Sullivan Lake with overnight lows in the 50's. Daytime highs during the wintertime are in the 30's, and winter nights come with lows in the 20's to Little Sullivan Lake. Be the first to submit input for Little Sullivan Lake. If you have info on Little Sullivan Lake, Lincoln County, Washington please submit it here to improve this web site.          Map Detailed Map Weather Local weather forecast