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13 Full Moons, 2 Supermoons, And Rare Halloween Blue Moon in 2020 – Mark Your Calendars!

13 Full Moons, 2 Supermoons, And Rare Halloween Blue Moon in 2020 – Mark Your Calendars!

This year promises to be a stargazer’s treat, especially when it comes to full Moons. In 2020, we’ll have 13 full Moons, including 2 two Supermoons, and two full moons in one month—the second is known as a “Blue Moon.” And that occurs on Halloween, making it an even rarer occurrence!

13 Full Moons in 2020

January’s Wolf Moon will be the first full Moon of 2020!

The first full Moon of 2020 howls onto the scene with January’s Wolf Moon on January 10th. And usually, we have one for each month, making the total 12 for the year. But on occasion, some months will have two full Moons. This is the case for October 2020: we’ll have a full Moon on Thursday, October 1st and again on Saturday, October 31st—a Halloween full Moon—which is not only rare in and of itself, but it will also be considered a “Blue Moon” because it’s the second full Moon of the same month.

See all the dates and times of the year’s full Moons here.

Rare Halloween Blue Moon in 2020

For more than half a century, whenever two full Moons appeared in a single month (which happens on average every 2 1/2 to 3 years), the second has been christened a “Blue Moon.” In our lexicon, we describe an unusual event as happening “Once in a Blue Moon.” This expression was first noted back in 1821 and refers to occurrences that are uncommon, though not truly rare.

When you look at the full Moon on Halloween night, it won’t appear blue in color but you’ll be looking at something pretty uncommon. A full Moon on Halloween only occurs roughly once every 19 years (known as a Metonic cycle). If the full Moons are calculated using Greenwich Mean Time, that translates to approximately 3-4 times per century. So maybe the phrase “once in a Blue Moon” really belongs to a full Moon on Halloween!

A Blue Moon By Another Definition

There is an alternate definition of a “Blue Moon,” which is based on a seasonal rule rather than a monthly rule:  Normally, there are three full Moons each season of the year. But when a particular season ends up containing four full Moons, the third then is referred to as a ‘Blue Moon.”  You can read more about Blue Moons here.

2 Supermoons in 2020

For a Supermoon to occur, we can thank the shape of the Moon’s orbit, which is not a perfect circle, but an oval shape. That means when the Moon orbits the Earth each month, it reaches a point that’s farthest from the Earth, called apogee, and a point where it swings closest to Earth, called perigee.

According to how most people define a Supermoon, it occurs when the Moon is at least 90% of the way to its perigee position at the same time it is in its “full” phase.

Based on this definition, we will experience two Supermoons this year:

When we have a Supermoon, the Moon can appear as much as 14% larger and 30% brighter than a normal full Moon.

With all this special full Moon activity in 2020, be sure to mark your calendars so you don’t miss a thing!

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  • Bozhidara says:

    Is tomorrow a Supermoon, because a lot of people say it is

  • Isabelle says:

    My birthday is day before a full moon. Should I be happy, worried, or both?

  • Grace Garcia Sutcliffe says:

    Is there a site that would remind me of the upcoming important moon phases?

  • Michael Newmark says:

    How are the full moon times computed? Can some please send me a link that explains that?

  • School Teacher says:

    I tell the students about the Farmers Almanac almost daily.

    Thank you for the the information.

  • Katrinastarbeck says:

    I also love the fact that on Halloween there will be a blue moon. JordanStrong. I’m also extremely excited about having 13 Moon’s in 2020. I enjoyed reading all the above.

  • Vickey Yanik says:

    I can stare at the moon even when it’s not full, but when it is. I feel the most connected to it. It makes my soul come more alive I absorb all of the energy I can. ✌🏻

  • Em See says:

    Awesome! I love supermoons, and there´s going to be a rare Blue Moon on my favorite holiday- Halloween. This is why I´m super pumped right now- not only is Halloween on Saturday this year, there´s going to be a rare Halloween Blue Moon this year! Whoo!

  • Tim says:

    I can’t say science can back me up, but I do believe that when the moon is full more babies are born on those nights. My youngest brother was born it was a full moon<. Then two of my three children were born on full moon nights. I have talked with many mother's and many of them said that their babies were born on full moon nights. Maybe there is some science behind what I believe. The moon controls the ties of the oceans, highs and lows twice a day 365 days a year. We also know that many animals and birds the moon helps or even controls them, like the bats. I don't know if any one has ever done a study on full moon and women and even animals giving birth during this time, but I feel many people would enjoy reading about it. Just thinking!

  • Gretchen says:

    I DO notice how the Full Moon, affects behavior. Not only family, BUT OTHERS TOO!!
    Love learning about the planets, stellar & solar system. FASCINATING, & STILL EAGAR TO LEARN, IN MY OLD AGE!! 😍

    • Susan Higgins says:

      Thanks, Gretchen, so glad you enjoyed. I find it amazing too. And since working here for FA I have become quite the astronomy buff, pointing out things to people in passing!

  • Laura says:

    Halloween and a blue moon.Two of my favorite things!
    Looking forward to howling that night.
    Love this info.Thanks.

  • James DeFrancisco says:

    A full moon on my birthday January 10th at midnight. TY Farmers Almanac.

  • Julie Zdrazil says:

    Once in a Blue Moon by Earl Thomas Conley-RIP-we lost him in 2019, is one of my favorite songs! If you don’t know the song, Google it! What a beautiful voice & man!

  • Suzie says:

    Always a joy for me to read all this Luna information,
    Thanks SO much, I share it because I LOVE it!!

  • Annie says:

    looking forward to the Super Moons thank you Farmers Almanac

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