Honda Civic having a hard time warming up?

I drive a 2008 Civic LX and when its 10 degrees fahrenheit or colder the engine has to sit about 5-10 minutes warming up! If I wait just several minutes the car wont fully warm up til about 20-25 minutes later driving at 35-60mph. ALSO the car oftentimes gets colder, say I'm coasting or just driving 45 through town the temp gauge loses "temperature". Is there anything to worry about? My Volkswagen always warmed up within a few miles and stayed "warm".

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