Craft a delightful Temperature Blanket for the hidden baby days!

This new concept temperature blanket celebrates your pregnancy days with the new light of your life.

Remember this?

Your belly is huge, you waddle like a duck, but your arms are empty and you’re sweltering in the heat.

Or it’s freezing outside, but you have to get groceries or take your toddler to the clinic, but you don’t have a coat that will fasten over your swelling midsection. So you throw a blanket around you hoping you don’t freeze.

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Commemorate those days you weathered for your child when he was just an image on an ultrasound but you couldn’t kiss her sweet face!

Temperature Blanket ~ It’s mostly single crochet!

Since I crocheted a pregnancy blanket for my new granddaughter Belle (here's the Phases of the Moon), I wanted to also make a blanket to honor the months my grandson was in utero. He’s almost 4 years old now. 

To be honest, temperature blankets haven’t been my preferred style. Maybe it’s because they aren’t consistent in the color changes. BUT, I used white throughout as a cohesive element, and I quite like it!

The blanket is nine squares, one for each month. The spike stitches in white remind me of the heartbeat of the treasure within.

4 steps

Basically, you’re four steps away from a temperature blanket that celebrates the actual first nine months of your baby’s life.

  • Planning
  • Squares
  • Joining
  • Border

I've divided this into 2 pages to make it easy for you to follow along. Steps 1 and 2, the planning and squares are on this page and steps 3 and 4, the joining and the border are here.

1. Plan the Temperature Blanket

Calculate the conception date

To begin a pregnancy blanket, it is necessary to calculate the conception date. You can figure that out in one of these ways:

     1.     Use the estimated due date from the doctor. Then count back 40 weeks on the calendar.


     2.     If you know the first date of the last menses before pregnancy, then add two weeks for an estimated conception date. Then count the weeks to the delivery date.

Make a chart

With the help of the historical weather page of, I found the high temperatures for every day my daughter-in-law was pregnant with RJ.

Then I made a chart with each max degrees for the whole pregnancy. You can see that I marked it up a lot!

Choose your colors

After raiding my stash of yarn, I chose a color to represent each set of ten temperatures. Since the high and low temperatures only occurred a few times, I could use colors that I only had a little of. You make that judgment call. But you’ll need 4 skeins of white. I used the 6 oz. Caron Simply Soft yarns mostly. Some are mystery acrylics from deep in the stash cupboard.

This 8x8x22 inch cardboard box helped me keep my yarn in order. Plus, I could easily move it to another room if needed.

Degrees F. ~ Color

                    30+   purple

                    40+   navy blue

                    50+   royal blue

                    60+   light blue

                    70+   green

                    80+   light green

                    90+   yellow

                  100+  red

2. Crochet the squares

Just a little math

I know I need 9 squares, so I counted the days and divided by 9 to find out how many rows each month should have.

For example: I counted 276 days (not every pregnancy is the same). 276 divided by 9 = 30.6 or 31, so each square needed 31 actual temperature rows and 15 white spike stitch rows. THE WHITE ROWS ARE NOT TEMPERATURE ROWS.

The nine squares

  • Each square begins with a row of white single crochet.
  • The pattern is one spike stitch row after two temperature rows. The white spike goes down into the previous white spike row. Place the spikes wherever you choose. I basically kept 6 stitches in between each spike, but randomly placed the first spike in each white row.
  • Each square has 48 rows total. If needed, add row(s) of white single crochet to make all the squares equal.
  • Follow your color chart for each row
  • Change yarn colors in your preferred method

Here’s a simple pattern for the Temperature Blanket

Chain 65 (Or whatever you choose to get the size you want)

Row 1: white sc across, turn

Row 2: Ch1, conception day temperature color - sc across, turn

Row 3: Ch1, next color in your plan – sc across, turn

Row 4: Ch1, sc spike stitches down into previous white row, turn

Rows 5, 6: Color rows

Row 7: White spike stitch row

Continue following your color chart: 2 rows color, 1 row white spike stitch, etc. until you have 48 total rows in the square.


  • Crochet over as many ends as possible, as long as the ends don’t show through the color or white yarn.
  • When you go around each square with white sc, you can crochet over the remaining ends.
  • Make a #1 on a small piece of paper and pin it to the first finished square. Label each square in this way so you can remember how to piece them together in order.

Finish the square

Sc all around each square with white so that the edges lie flat. I put one sc in each row along the sides, but it was too much and made the join too wavy. So I skipped some stitches in the course of each side to make about 40 stitches per side. (Use your judgment for your own blanket. I frogged a couple times here and there to make it right.)

For steps 3 and 4 please click here.

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