Crochet Temperature Blanket Pattern
Pick your city and a start date, and this free tool turns the real daily temperatures into a complete temperature blanket crochet pattern — a color chart fitted to your climate, written rows or granny squares, and an exact per-color yarn shopping list.
Patterns are produced by deterministic algorithms and machine-validated for stitch-count accuracy — never written by a language model.
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Dates & shape
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Weather data: NOAA GHCN-Daily. Place search © OpenStreetMap contributors.
What is a temperature blanket?
A temperature blanket records a year of weather in yarn: you crochet one row or one granny square per period — a day, a week, or a month — in a color keyed to that period's temperature. A row-per-day year is 365 rows; week averages make 53 rows; a square-per-month year is a beginner-friendly 12 squares. This page builds the whole pattern from your city's real recorded temperatures, so every color is decided before you start.
How many chains and how much yarn?
At worsted gauge (4 single crochet stitches and 4.5 rows per inch), a 150-stitch row blanket starts on a foundation chain of 151 (150 working chains + 1 turning chain) and comes out about 37.5 in wide; 365 single crochet rows stack to about 81 in tall and use roughly 2,080 yards of yarn. For a past-year temperature blanket, every day's color is already known — so the pattern computes exactly how many yards of each color you need, before you buy yarn.
Mild climates
Mild climates work because the color bands are fitted to your city's own range, not a fixed national chart. San Diego's roughly 48–85 °F year splits into 8 real bands about 4.6 °F wide, so every band actually appears in the blanket. If your range is still narrow, use fewer bands, or color by high + low to double the variety in the same year.