Pima County, AZ Roof Snow Load - 0 psf

How much snow is too much for a roof in Pima County, AZ?

Picture it, not just weigh it: 0 in. if it's fresh powder, 0 in. once it settles, or a mere 0 in. if it's ice. This county’s ground snow load maps to zero - snow load is not a driver of roof design here.

Pima County in numbers

• Design roof snow load0 psf
• Ground snow load, ASCE 7 map0 psf
• National rank#2,488 of 2,758
• Arizona rank#3 of 13
• Population1,080,149
• Annual snowfall, NOAA normal8 in.
• FIPS04019

How Pima County compares

0 psf ranks #2,488 of 2,758 US counties with a mapped snow load (top 90%) - and #3 of 13 in Arizona. That's 0.4 psf below Arizona's own county-average design load of 0.4 psf.

Population 1,080,149 (FIPS 04019), roughly 32.128°N 111.7837°W. The 0 psf ground snow load ASCE 7-22 maps here becomes 0 psf once the code's own design factors are applied.

Typical snowfall in Pima County, AZ

NOAA's 30-year normal for Pima County: 8 in. of snow a year, from the KITT PEAK, AZ US station. (fresh vs. packed vs. ice explains why.)

What this Pima County figure assumes

This is a county-level reference figure for a typical heated home built to Risk Category II (ordinary residential), on a partially exposed lot - the assumptions ASCE 7-22 itself treats as the default case. A steeper roof, a fully exposed hilltop lot, an unheated structure, or a higher risk category all change the actual number.

Pima County's permit office wants an address-specific figure, not this county average - the ASCE 7 Hazard Tool is free, takes under a minute, and outputs a PDF most reviewers accept. Details: the calculation guide.