Early February is not too crowded. It will get busier around the 16th due to President's Day weekend.
February weather is completely unpredictable..you could have warm days and cool mornings, or you could have mornings near freezing with afternoons in the 50s.
March is milder and gets a lot busier due to Spring breaks.
Try Weather Underground - I can't post the URL but it's the name of the site. If you click on the 'Trip Planner' link in the top right, you can input your destination and dates of travel and it will give you the actual historical weather for the past 5-7 years. It's no guarantee, obviously, but it should give you an idea of the basic trends . . .
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