About this chart
This chart shows annual appreciation for single-family detached homes in one ZIP code: the change in the average sales price per square foot over 12 months compared with the 12 months to the same point a year earlier. Each point covers the 12 months ending with the month it sits at, so the point at August covers September 1 of the year before to August 31; the newest point is the last month that has finished. Above zero, prices are higher than a year ago; below zero, they are lower.
Each year has its own line, laid out by month, so you can compare this year with earlier years at the same point in the season. Pick any of 149 ZIP codes from the ZIP Code list (it opens on 85003); the last three years are ticked to start with, and you can tick any year back to 2002.
Hover over a line to see the exact figure for that month.