The most dramatic views of the crescent Venus will come during July and August over in the northwestern sky. Between now and then, don't be tricked into reporting a UFO hovering low in the western sky. Venus will become very noticeable there in the evening twilight and its brightness can take casual skywatchers by surprise. Once in a blue moon January brings a special situation with the moon's full phase. There are two full moons in January.
Blue moons mean simply that two full moons occur within the same calendar month.
The moon doesn't necessarily have an unusual color on either date. A full moon occurs about every 29 days, so given a 30 or 31 day month, it's possible to have two full moons in the same month. This happens on average every 2.72 years. The moon can appear a variety of colors depending on material in the Earth's atmosphere that acts on moonlight passing through it. The more common color seen is a reddish full moon rising in the east on evenings when considerable pollution, haze or smoke fills the air or any time there is a total lunar eclipse.