Climate & Growing Zones — a whole-globe hardiness & planting simulator

drag anywhere on the map — only latitude (up/down) matters, longitude is stylized decoration

⟩

slide to unlock

Location

Singapore

1.35°N

Zone & climate (real, from data.js)

Zone ——

—

Annual mean temp—

Seasonal amplitude—

Annual min temp (zone input)—

Frost-free window—

Right now — shared clock

Date1999-01-01

Day length here—

Solar declination—

June solstice day length—

Dec solstice day length—

Speed3 d/s

Seasonal temperature

Orange = modeled daily temp across the year; green band = frost-free (>0°C); gold line = today.

Day length (real solar geometry)

Blue = real day length from solar declination; dashed = 12h; gold line = today. Near the poles this touches 0h (polar night) and 24h (polar day).

Plantable crops (real 40-crop catalog)

—

Compare locations

Zone breakpoints, Koppen groups and the 40-crop catalog are transliterated from OnlyCSharp.Data/1.9 (USDA PHZM 2023 / Koppen 1900 — see README.md). The latitude→temperature curve and Koppen-mapping rule are this app's own stated modeling choices, not measured data. Self-contained, no dependencies.