Mild climate load. Physical climate score and electricity cost are reported separately.
Tucson has a mild climate load. Its Climate Stress Score of 5.0 is below the indexed-metro median of 37.9. The January normal low is 42.3°F, and 0 months have a normal low below freezing.
The primary planning issue in this profile is site design and equipment selection rather than severe climate. The standardized 9 kW session estimate is $2.18, below the indexed-metro median of $2.46; this uses the Arizona statewide residential electricity average, not a city utility quote. The selected snowfall record reports 0.0 inches annually.
For construction or maintenance work that is easier in moderate conditions, the monthly normals point to January, February, March, April. This is a climate-screening observation, not a construction schedule or permit recommendation.
| Profile | Climate | 9 kW session | Jan. low |
|---|---|---|---|
| Tucson | 5.0 | $2.18 | 42.3°F |
| Indexed median | 37.9 | $2.46 | — |
| Closest index peer: Las Vegas | 6.8 | $1.83 | 39.4°F |
Climate source: NOAA/NCEI U.S. Monthly Climate Normals 1991–2020 (direct by-station archive)
Temperature/precipitation station: USC00028815 — TUCSON WFO (1.2 mi from city reference point)
Normal period: 1991–2020
Electricity source: EIA residential retail electricity price (2026-07)
Rate geography: Arizona statewide residential average
Dataset generated: September 28, 2026
Recent observations through: Not available
Snowfall status: available. Missing values are not included in rankings.
