San Diego Temperature Blanket 2025
San Diego’s 2025, drawn as a blanket: one row for every day, colored by the daily average temperature. The numbers below come from NOAA readings at San Diego International Airport.
January at the top, December at the bottom. 8 even bands, rainbow palette.
The year in San Diego
The warmest reading was a high of 88°F on August 29, and the coldest a low of 39°F on January 14. The average of the daily averages was 64°F. The low never reached freezing, and the high never hit 90°F.
With eight even bands, the color that covers the most days is green (61 to 65°F) at 85 days. The biggest one-day jump in the average was 8.5°F, on December 30. The station reported both a high and a low on 99.5% of days; the rest are estimated from neighboring days.
Colors, days and yarn
Average temperature bands for San Diego 2025. Yarn is for a 50-inch single crochet blanket, one row a day, in worsted weight: about 4,567 yards in all.
| Color | Range °F | Days | Share | Yards | Skeins |
|---|---|---|---|---|---|
dark purple #5b2a86 | 51 to 54 | 7 | 1.9% | 88 | 1 |
blue #2f5bd3 | 54 to 58 | 47 | 12.9% | 588 | 3 |
aqua #2aa7d6 | 58 to 61 | 57 | 15.6% | 713 | 4 |
green #3aa655 | 61 to 65 | 85 | 23.3% | 1,064 | 6 |
yellow #f2d23c | 65 to 68 | 62 | 17.0% | 776 | 4 |
orange #f08a24 | 68 to 71 | 63 | 17.3% | 788 | 4 |
red #d6322b | 71 to 75 | 36 | 9.9% | 450 | 3 |
dark red #8f1b2c | 75 to 78 | 8 | 2.2% | 100 | 1 |
Skeins use 200 yards each, rounded up. Estimates only: swatch first.
Month by month
Average, lowest and highest daily average for each month, and the color that appears most.
| Month | Average °F | Lowest | Highest | Most common color |
|---|---|---|---|---|
| January | 56 | 51 | 63 | blue |
| February | 59 | 55 | 66.5 | aqua |
| March | 59 | 53 | 63 | aqua |
| April | 62 | 57 | 65.5 | green |
| May | 65 | 60 | 72.5 | green |
| June | 66 | 63.5 | 73.5 | yellow |
| July | 69 | 66.5 | 73 | orange |
| August | 71 | 67.5 | 78 | orange |
| September | 72 | 68.5 | 75.5 | red |
| October | 66 | 61.5 | 71 | yellow |
| November | 62 | 55.5 | 67 | green |
| December | 60 | 56 | 69 | aqua |
Make your own San Diego blanket
This chart uses one setup. In the planner you can switch to highs or lows, balance the days, change the palette, set your gauge and choose another year. San Diego International Airport (USW00023188) is 3 km from the center of San Diego.
Everything on this page is free in the planner. The free planner covers any city and year, up to 8 color bands, the preview, counts and a daily table. The Planner Pack ($3.99, one-time) adds the printable chart, checklist and yarn list. See pricing.
Questions
How cold did San Diego get in 2025?
The lowest reading was 39°F on January 14 at San Diego International Airport, and the low was at or below freezing on 0 days.
How many colors does a San Diego temperature blanket need?
This chart uses 8 even bands from 51°F to 78°F. You can use fewer or more in the planner.
Which weather station is used for San Diego?
San Diego International Airport (USW00023188), 3 km from the center of the city. Data is from NOAA NCEI daily summaries.
Is the planner free?
Yes. Any US city and year, the on-screen preview, up to 8 color bands, the color and yarn counts, the daily table and a picture download (with a small “Made free” line) cost nothing. The Planner Pack ($3.99, one-time) adds the printable PDF chart, a daily checklist, a yarn shopping list and more.