Sunlight hours by city: why the same house feels different in Seattle and Phoenix

The sunshine hours map: 30 US cities compared

Sunshine hours measure the time when the sun is actually visible—not blocked by clouds, fog, or haze. Every city gets roughly the same number of daylight hours over a year (about 4,380), but the percentage that's actually sunny varies wildly. This table uses NOAA climate data for average annual sunshine hours.

A quick pattern: once you drop below about 2,500 annual sunshine hours, south-facing goes from "nice to have" to "genuinely changes how the home feels." And above 3,500 hours, the conversation shifts from getting enough light to managing too much heat.

Why location changes the orientation calculation

Orientation advice isn't universal. The "south-facing is best" rule works across most of the US, but climate and latitude create real exceptions.

Latitude and sun angle

The further north you live, the lower the winter sun sits in the sky. In Minneapolis (45°N), the winter solstice sun reaches only about 22 degrees above the horizon at midday. In Miami (26°N), it hits 41 degrees. That difference matters: lower angles push sunlight deeper into rooms through south-facing windows, making south-facing orientation more impactful in northern cities.

It also means south-facing windows in northern cities capture more BTUs of passive solar heat per square foot of glass during winter. The low angle is like a spotlight aimed directly into the room. In southern cities, the steeper angle means less penetration and less passive heating benefit—which matters less anyway because winters are mild.

Cloud cover vs. latitude

Here's the counterintuitive part: latitude alone doesn't predict sunshine. Minneapolis (45°N) gets 2,711 sunshine hours. Seattle (48°N) gets 2,170—despite being only three degrees further north. The difference is clouds. Minneapolis has cold, dry, clear winters. Seattle has mild, wet, overcast ones.

Cleveland sits at 41°N—same as Salt Lake City—but gets 2,030 sunshine hours compared to Salt Lake's 3,029. Lake effect clouds from Lake Erie are the culprit. If you're evaluating homes in a city, don't assume your latitude tells the whole story. Check actual sunshine data.

Humidity and perceived brightness

Even when the sun is out, humidity affects how bright a home feels. High humidity scatters light, creating a diffuse glow rather than sharp direct sun. Miami and Houston both get decent sunshine hours, but the light quality is different from Denver or Phoenix. In humid climates, south-facing windows still help, but the dramatic "shaft of golden light across the floor" effect is less pronounced. The light reads as bright but soft rather than bright and directional.

Sunniest cities: does orientation even matter?

In Yuma, Phoenix, Las Vegas, and El Paso, you're getting 3,700+ hours of sunshine a year. That's over 10 hours of sun per average day. Homes in these cities aren't starving for light—they're drowning in it.

In these markets, orientation advice flips. South-facing is no longer the priority; heat management is. A south-facing home in Phoenix with large unshaded windows can see cooling bills of $350-$500/month in summer. The same home facing north might run $200-$300. That's real money over a 30-year mortgage.

What works in desert cities

Minimize west-facing glass. Late afternoon sun hits west walls at a low angle when outdoor temps peak at 110°F+. This is the single biggest driver of cooling costs. If you're buying in Phoenix, check west-facing windows first.

North and east exposure are your friends. North-facing rooms stay cool. East-facing rooms get morning sun before the real heat sets in, then shade through the brutal afternoon. These orientations that feel like compromises in Cleveland are advantages in Tucson.

South works with proper shading. A 3-foot overhang on a south-facing home blocks most summer midday sun at these latitudes (the summer sun is nearly overhead at 80+ degrees). If the home has overhangs, deep porches, or mature shade trees on the south side, south-facing can work fine. Without them, it's a liability.

Cloudiest cities: how to maximize what you get

Seattle, Pittsburgh, Cleveland, Buffalo, Portland. These cities average fewer than 2,350 sunshine hours—barely half of what Yuma gets. When sunlight is scarce, every design decision around light becomes more consequential.

South-facing is non-negotiable

In a city with 2,000 sunshine hours, a north-facing living room might get as little as 200-400 hours of direct sun per year. A south-facing living room in the same building gets 800-1,200. That's the difference between a room that feels perpetually dim and one that feels alive on the days the sun does show up. In cloudy cities, south-facing isn't a luxury. It's the price of admission for a bright home.

Windows matter even more

In a sunny city, a small window still delivers plenty of light. In Seattle, that same small window barely registers. If you're buying in a cloudy market, prioritize homes with generous glazing—especially on the south side. A window-to-wall ratio of 15-20% on south-facing walls is the sweet spot: enough glass to capture available light, not so much that you lose heat on cold cloudy days.

Light-colored interiors amplify scarce sun

White walls in Yuma are a stylistic choice. White walls in Cleveland are a functional one. Light interiors bounce whatever sunshine enters the room deeper and wider, making a 20-minute sunny break feel like it lights up the whole space. Dark accent walls are gorgeous in photos, but in a 2,000-sunshine-hour city, they absorb the light you can't afford to lose.

The seasonal mental health factor

This goes beyond aesthetics. Seasonal Affective Disorder affects roughly 6% of the US population and up to 10% in northern states. Access to natural light—especially morning light—is one of the primary non-pharmaceutical interventions. In cities like Seattle and Pittsburgh, a south or east-facing bedroom and living area isn't a preference; for some people, it's a health decision.

Your city's light profile

The table gives you the broad picture, but your home's actual light depends on specifics: what floor you're on, what's across the street, how much tree cover surrounds you, and which rooms have which windows. A south-facing home in Portland with a clear southern view will outperform a south-facing home in Phoenix that's squeezed between two taller buildings.

Paste an address into the Will It Be Bright calculator and see the orientation, sunlight pattern, and seasonal breakdown for that specific property. Takes ten seconds, works with any US address, and doesn't require a physical visit.