crochetguideTemperature blanket planner: colors, rows and a year of data
A temperature blanket gives every day of the year a row, in the color of that day’s temperature. Start from a city’s 2025 daily highs, paste your own, or set a range, then choose your colors and see how many rows each one needs.
New York, 2025: 365 rows
Daily highs from -8.4 °C to 40.4 °C, in bands of 6.1 °C.
Your colors
- -8.4 to -2.3 °C10 days · 10 rows
- -2.3 to 3.8 °C44 days · 44 rows
- 3.8 to 9.9 °C56 days · 56 rows
- 9.9 to 16 °C59 days · 59 rows
- 16 to 22.1 °C56 days · 56 rows
- 22.1 to 28.2 °C70 days · 70 rows
- 28.2 to 34.3 °C58 days · 58 rows
- 34.3 to 40.4 °C12 days · 12 rows
How the colors are shared out
The planner splits the range from the coldest to the warmest temperature into equal bands, one per color, and counts the days that fall in each. A day exactly on a boundary goes to the warmer color. Set your own coldest and warmest values to keep the same colors from year to year, or to give the middle of the range more colors.
Most makers use the daily high; some use the daily average or two rows a day for high and low. Whatever you choose, keep it the same all year, and keep a note of each day’s color with the row counter.
Plan the yarn
Each color’s rows tell you its share of the blanket. Make a swatch in your stitch, weigh it, and use the blanket size calculator for the width; multiply the yarn for one row by each color’s rows, and buy a little extra of the colors your climate uses most.
City data: daily maximum air temperature at 2 m, 2025, from the Open-Meteo historical weather API’s default Best Match model (ECMWF IFS HRES, ERA5 and ERA5-Land combined), by each city’s local day (Open-Meteo, license CC BY 4.0). Model values describe the surrounding area and can differ by a degree or two from a single weather station.