New Jersey's Climate Classification: Humid Subtropical / Humid Continental (Not "Arid America")
New Jersey is not in "Arid America" nor a simple "Humid America." It spans two Köppen zones:
| Region | Köppen | Description |
|---|
| South / Coastal / Delaware Valley | Cfa — Humid Subtropical | Hot, humid summers (Jul avg 75–80°F); mild winters (Jan avg 30–35°F); precipitation year-round (45–50"). |
| North / Northwest (Highlands, Ridge & Valley) | Dfa — Hot-Summer Humid Continental | Warm-hot summers; cold winters (Jan avg 20–25°F); snow 30–50"; precipitation ~50". |
Why the Confusion?
- "Humid America" sometimes refers to the Humid Subtropical (Cfa) belt (SE US). NJ straddles its northern edge.
- "Arid America" = Southwest (BWh/BWk/BSk) — NJ is 2,000+ miles from true arid zones.
- Older textbooks used "Humid Continental" for entire Northeast; modern data shows southern NJ is Cfa.
Practical Implications
- Gardening: USDA zones 6b (NW) to 7b (Cape May) — wide plant palette.
- Building: Freeze-thaw cycles north; hurricane/coastal flood south.
- Energy: Heating dominant north; cooling dominant south.
Verdict: New Jersey = Humid Subtropical (south/coast) + Humid Continental (northwest). Neither "Arid" nor a monolithic "Humid America."
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