Arizona Sun Hours: Why Phoenix Gets More Solar Power Than Almost Anywhere

Phoenix gets 6.5 peak sun hours per day. The national average is around 4 to 4.5. That gap is not a marketing talking point — it's the actual reason solar systems installed here pay back faster, produce more, and save more than virtually anywhere else in the country.

If you've been putting off solar because the economics feel uncertain, this is probably the most important thing to understand first.

What a Peak Sun Hour Actually Is

A peak sun hour is not just any hour of daylight. It's specifically one hour during which sunlight hits your panels at 1,000 watts per square meter — full, direct Arizona sun. Seattle gets about 3.5 of those per day. Los Angeles gets around 5.6. Phoenix gets 6.5.

That extra hour of peak production compared to LA adds up to about 365 additional hours of maximum output per year. On a typical 8 kilowatt system, that's roughly 2,900 extra kilowatt hours annually. At 15 cents per kilowatt hour, that's more than $400 per year in additional energy value compared to a California system of the exact same size.

The Numbers Behind Your Savings

Here's what 6.5 peak sun hours actually means for your APS bill.

A properly sized 8 kilowatt system in Phoenix produces approximately 19,000 kilowatt hours per year. APS residential rates average 14 to 17 cents per kilowatt hour depending on your rate plan. That output can eliminate $2,600 to $3,200 in electricity costs annually — and that's before factoring in the rate increases APS has applied steadily over the past decade.

Over 25 years, you're looking at $65,000 or more in avoided utility costs. That number gets bigger every time APS raises rates, which they have done consistently and will likely continue to do.

Want to run your specific numbers? Use our solar calculator — it takes about two minutes and gives you a real figure based on your actual usage.

What Sun Hours Look Like City by City

Sun hours across the Phoenix Valley are not all identical, but the differences are small enough that every major city in the metro is an excellent solar location. Here's the breakdown:

Phoenix: 6.5 peak sun hours per day. Scottsdale: 6.5. Surprise: 6.5. Glendale and Peoria: 6.4. Chandler: 6.4. Mesa and Gilbert: 6.3. Tempe: 6.3. Queen Creek: 6.2.

Even Queen Creek at the lower end beats the national average by nearly two full hours of peak production every single day. There is no bad place to put solar in this valley.

In Chandler and Gilbert, most homeowners are on APS. Summer bills of $300 to $400 a month are common. With 6.3 to 6.4 peak sun hours, a well sized system can get those bills to near zero from May through October. We put together a detailed East Valley breakdown in this post on whether solar is worth it in Chandler, Gilbert, and Mesa.

In Scottsdale, homes tend to run larger and electric loads run higher — $450 to $650 APS bills in summer are not unusual. The good news is that 6.5 peak sun hours gives you the production headroom to size a system that can actually cover those bills without needing an excessive number of panels.

In the West Valley — Glendale, Peoria, Surprise, Goodyear — the same strong sun hours apply. These communities have grown dramatically over the past decade. Newer rooftops out here tend to work well for solar, and if you're on APS, the case is as strong as anywhere in the Valley.

Winter Production — This Comes Up More Than You Would Think

Homeowners sometimes worry about winter. It's a fair question if you've heard stories about solar underperforming in cloudy climates. Phoenix is not that.

In December and January, Phoenix still averages 5 to 5.5 peak sun hours per day. Production does drop compared to summer, but you're starting from such a high baseline that winter output here beats summer output in most Northern states.

Here's the thing about the seasonality that most people miss: your APS bill is lowest in winter anyway. You're not running the AC from December through February. The system is designed for Arizona conditions, and Arizona's climate genuinely cooperates — high production in summer when your bill is highest, lower production in winter when you need the least. It works out cleanly.

Locking In the Advantage With the Prepaid Solar Lease

Understanding your sun hours is great. Actually capturing that value in your wallet requires the right approach to financing.

The prepaid solar lease is how we recommend most Phoenix Valley homeowners go solar right now. You pay one upfront amount at a 30 percent discount from the standard system cost. No monthly payment. No loan. No interest. Your panels go in, your production starts, and your APS bill shrinks — sometimes dramatically.

For a household paying $280 a month to APS, the math on a prepaid lease often compares favorably to almost any other investment you can make with that money. The sun isn't going anywhere, and your payback period in Arizona is shorter than it would be virtually anywhere else in the country.

Contact our team to find out whether the prepaid lease makes sense for your home and your bill. If you want to come to the conversation with numbers in hand, our solar calculator is a good place to start.

The Honest Part: Sun Hours Are One Piece of the Puzzle

Six and a half peak sun hours per day is a real advantage. It is not everything.

Your roof orientation matters a lot. A south facing roof captures more direct sun than a west facing one. Shading from trees, neighboring structures, or rooftop equipment cuts into production. The age and condition of your roof affects whether installation even makes sense right now. Two houses on the same block in Gilbert, both sitting under 6.3 peak sun hours, can have very different system output depending on what's going on with their roofs.

Some solar salespeople lean too hard on the 'Arizona is the best solar state' pitch without addressing the specific conditions of your roof. It's true. It's also not the whole story. A good installer — or an independent solar broker — will give you a real assessment of your actual roof before throwing savings numbers at you.

That's how we approach it. Visit our about page to learn more about how we work, or reach out and we'll take a look at your specific situation.

Frequently Asked Questions

How does Phoenix compare to other cities for solar production?

Phoenix is consistently in the top tier nationally, usually in the top five solar cities. With 6.5 peak sun hours per day versus a national average of 4 to 4.5, solar systems here produce significantly more energy per panel than in most other metros. Seattle gets 3.5 peak sun hours. Chicago gets around 3.8. A Phoenix system of the same size as one in those cities will produce close to twice the annual energy.

Will my panels still produce on cloudy days?

Yes, at reduced output. Clouds cut into production but don't shut panels down entirely. Phoenix averages 299 to 315 sunny days per year, so genuinely cloudy days are rare enough that they don't meaningfully change your annual production numbers.

What exactly is a peak sun hour?

One hour of sunlight hitting your panels at 1,000 watts of intensity per square meter. Not just any daylight — peak intensity. When you hear Phoenix gets 6.5 peak sun hours per day, it means your panels operate at or near full power for the equivalent of six and a half hours, even though the sun is up much longer than that.

Does Arizona heat hurt solar panel efficiency?

Technically, yes — panels are rated at 77 degrees and efficiency does decrease somewhat at higher temperatures. But the sheer volume of peak sun hours in Arizona more than offsets the heat effect. You're producing so much more energy from the additional sunlight that the efficiency dip from heat is a minor factor in your actual annual output.

Is the 30 percent prepaid lease discount real?

It is. The prepaid lease is a legitimate structure where you pay a discounted lump sum upfront in exchange for the system output over the lease term. No monthly payment, no interest, no loan affecting your credit. The 30 percent reduction is off the standard system cost, and for most Phoenix Valley homeowners, it's the most financially efficient way to go solar right now.