Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Statistics for four geo-aggregation levels (1 km2, 5 km2, 10 km2, and municipality level) for yearly and monthly averaged data: Pearson's correlation coefficient (r), and slopes and intercepts of the linear regression line. Most ideal values for slope and intercept, and the minimum level for a ‘strong’ correlation (r = 0.60) are indicated by a dashed horizontal line. Symbols: (•) 1 km2 level, (○) 5 km2 level, (■) 10 km2 level, and (△) municipality level.
