Climate zones of the Lower 48, based on zones of the warmest 6 months, coldest month, and moisture index (ratio of precipitation and positive temperature average; 1971-2000 data from PRISM
Composite map of climate, soil texture, wetlands, soil pH, and
topography.
©BONAP
Average temperature of warmest month (July) in °C (Data from
PRISM, based on 1971-2000 climate normals) ©BONAP
Average temperature of coldest month (January) in °C (Data from
PRISM, based on 1971-2000 climate normals) ©BONAP
Annual precipitation in centimeters (Data from PRISM, based on
1971-2000 climate normals) ©BONAP
Percent of annual precipitation falling May-October, the warmest
6 months of the yearData from PRISM, based on 1971-2000
climate normals) ©BONAP
Warmth index (positive temperature averages for the warmest 6
months; i.e. May – October averaged, whereby monthly
temperatures less than 0°C are assumed zero)
Moisture index (ratio of annual precipitation over annual
evapotranspiration, where evapotranspiration is estimated by
multiplying the annual positive temperature average, or
Holdridge biotemperature (annual positive temperature average
with no maximum limit)
US County-level assessment of all glaciated areas ©BONAP
US County-level assessment of the maximum extent of glaciated areas ©BONAP
US county-level assessment of the Cordileran Ice Sheet ©BONAP
US county-level assessment of mountain glaciers ©BONAP
US county-level assessment of the Wisconsin Ice Sheet ©BONAP
USDA Plant Hardiness Zones
Hardiness Zones (Metric System) ©BONAP
Hardiness Zones (English System) ©BONAP