Figure 1. Examples of environmental averages and their estimation. a) 30-year standard average between January 1971 and December 2000 (360 months or 30 years). b) Matching the timing of occurrence data and the environmental average using 120 months (ten years) before the date of observation. Black points represent the date of observation at each of ten occurrence points. Greyline intervals represent the period for which bioclimatic averages are calculated.