Understand the weather types
Learn how DP, DM, DT, MP, MM, MT, Transition, and their + subsets are defined and counted.
Weather Types & Data GuideTypical geographic patterns
Each circle represents an SSC station. Color indicates the percentage of classified days assigned to the selected weather type.
Use type total to include the parent type and all of its + subsets. Use plus subset only to isolate the more extreme portion of the type.
Dry Polar frequency — Annual
The fixed 0–50% color scale supports comparison among maps. Circles show station observations; values are not interpolated between stations. Missing classifications are excluded from the frequency denominator.
Inspect one station
View detailed frequencies and temperature and dew-point characteristics for an individual station.
Visual Climatology