California Climate Zone 14
Climate zone 14 covers the high desert — the Antelope Valley, the Victor Valley and the Mojave, plus the mountain-desert edge of San Diego County. The Energy Commission assigns 89 of California's ZIP codes to it, making it the 13th largest of the sixteen.
Title 24 Reports from $199 100% Online
Where zone 14 is
The Energy Commission assigns 89 ZIP codes to zone 14 — about 3.3 per cent of every ZIP code it lists, and the 13th largest of the sixteen. Places in it include Lancaster, Palmdale, Victorville, Barstow, Ridgecrest, Yucca Valley and Julian.
The zone is scattered rather than contiguous, appearing wherever elevation or desert conditions occur — which is why neighbouring towns can be in different zones. The ZIP codes fall in the prefix ranges 919xx, 920xx, 922xx, 923xx, 935xx.
What drives compliance in zone 14
The high desert swings hard between hot days and cold nights, so both loads are real and the diurnal range is itself a design factor. Thermal mass and air tightness matter more here than in a zone where only one season is demanding, and equipment has to cope with both ends.
Where zone 14 ends
Zone 14 is scattered rather than contiguous, appearing across the Antelope Valley, the Victor Valley and the Mojave, and again at the mountain-desert edge of San Diego County around Julian. That means neighbouring towns can be assigned differently depending on elevation.
Boundaries follow conditions rather than administrative lines, so the assignment is resolved from the project ZIP code rather than inferred from the city on the drawings.