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Temperature Pi Blanket

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  • Craft:                     Knitting
  • Suggested yarns:  Doulton Border Leicester 4ply, Rowan Kidsilk Haze
  • Yarn weight:          Fingering / 4 ply (14 wpi), Lace/2ply
  • Gauge:                  18 stitches and 26 rows = 10 cm on 4 mm in stocking stitch/stockinette in the round
  • Needle size:          4.0 mm / US size 6, or 3.75 mm / US size 5 for temperature only.
  • Yardage:                Unknown at this time
  • Sizes available:    two variants, with or without Kidsilk Haze, approx. 260 - 280 cm / 102 - 110" in diameter
This pattern is available as a free download.

My project for 2021 is this Temperature Pi blanket, a very large and very cosy record of the temperature and weather where I live. Although I can predict the approximate size (260-280 cm in diameter), and the placement of the increases, I cannot show you a finished example; the gallery shows you what my blanket looks like, but yours will inevitably look very different. Please see the blog entries for this project at for information about my progress.

I used a palette of 9 colours from the Doulton Border Leicester 4ply range to denote the temperature range from -5°C to 40°C in 5 degree increments; I added a thread of Rowan Kidsilk Haze in 7 colours to represent weather conditions such as sun, wind, overcast, rain, snow, fog, and storm. You can work with just the temperature if you prefer, on slightly smaller needles; your blanket will be slightly smaller but just as lovely!

The pattern consists of a written pattern, with a charted and written lace edge for the month of December, plus an Excel spreadsheet for you to record the temperature and weather conditions each day. See the blog post for more detail.

This pattern has been tech edited but not test knit, except by me. If you find any errors or unclear passages in the pattern, please let me know so that I can correct/clarify. Full pattern support is available by emailing me.
This pattern can be knit in any fingering/4ply weight  yarn, it is very adaptable to your budget and stash.  As always, when substituting yarn, be sure to knit a swatch to check that you are able to get the right gauge for the pattern. Suggested yarn substitutes can be found at
You will get the following files:
  • PDF (133KB)
  • XLS (30KB)

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