Peak Sun Hours in Fort Worth, Texas, United States
- Solar zone
- Zone 3 (good)
- Best month
- July (6.9)
- Worst month
- December (2.7)
- Climate
- Temperate · 18.8°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 3.01 | 3.95 | 4.76 | 0.98 | 6.8 | 71 |
| Feb | 3.54 | 4.96 | 4.53 | 1.25 | 8.9 | 73 |
| Mar | 4.60 | 6.21 | 4.97 | 1.60 | 14.0 | 71 |
| Apr | 5.56 | 7.27 | 5.28 | 1.96 | 18.6 | 69 |
| May | 5.99 | 7.77 | 4.94 | 2.33 | 23.3 | 70 |
| Jun | 6.84 | 8.01 | 6.04 | 2.33 | 27.8 | 65 |
| Jul | 6.87 | 7.80 | 6.09 | 2.34 | 29.9 | 59 |
| Aug | 6.26 | 7.18 | 5.82 | 2.09 | 30.1 | 57 |
| Sep | 5.24 | 6.26 | 5.43 | 1.76 | 25.7 | 63 |
| Oct | 4.18 | 5.18 | 5.42 | 1.23 | 19.4 | 66 |
| Nov | 3.19 | 4.09 | 4.80 | 1.03 | 13.1 | 69 |
| Dec | 2.70 | 3.59 | 4.42 | 0.92 | 7.8 | 71 |
GHI, Clear-sky, DNI, DHI in kWh/m²/day. Data: NASA POWER climatology (long-term monthly averages).
Off-grid calculator
Add appliances
- Add an appliance to size a system.
Sizing
- Daily load
- 0.00 kWh
- Panel wattage
- 0 W
- Panel count (400W modules)
- 0
- Battery bank
- 0.0 kWh
Sizing against worst-month PSH of 2.70 kWh/m²/day, 0.77 system efficiency.
About solar in Fort Worth
Fort Worth, United States has a temperate climate with meaningful seasonal variation in solar resource. Its annual peak sun hours average 4.83 kWh/m²/day, a good solar resource by global standards.
The strongest month in Fort Worth is July (summer) at 6.87 kWh/m²/day, and the weakest is December (winter) at 2.7 kWh/m²/day. When sizing a year-round off-grid system, it's standard practice to design against the December value rather than the annual average — otherwise the battery bank runs low during the darkest weeks.
Fort Worth's solar conditions are well within the range where off-grid PV is a straightforward engineering exercise with standard-sized arrays and lithium batteries.
FAQ
- What are the peak sun hours in Fort Worth?
- Fort Worth averages 4.83 peak sun hours per day annually, ranging from 2.7 in December to 6.87 in July.
- How many solar panels do I need in Fort Worth?
- Panel count depends on your daily load. At Fort Worth's annual average of 4.83 kWh/m²/day, a 5 kWh/day load needs roughly 4 × 400 W panels. Use the calculator above for your actual load.
- What size battery do I need in Fort Worth?
- Sizing against Fort Worth's worst month (December, 2.7 kWh/m²/day) with 2 days of autonomy at 80% depth of discharge, a 5 kWh/day load needs about a 12.5 kWh battery bank.
- How does Fort Worth's solar resource compare globally?
- Fort Worth sits in solar zone 3 out of 5 (where 5 is strongest) at 4.83 kWh/m²/day — good by global standards. For reference, top-tier desert sites average ~6.5 and high-latitude cities around 2.5 kWh/m²/day.
- How much does winter reduce solar output in Fort Worth?
- Fort Worth's worst month (December) delivers 2.7 kWh/m²/day — about 39% of the summer peak of 6.87. Off-grid systems here typically oversize 1.5–2× or pair with a backup source.
- Do cloudy days significantly affect Fort Worth's solar?
- Partly. Diffuse light still produces 10–25% of clear-sky output. Fort Worth's 4.83 kWh/m²/day already reflects average cloudiness, so no further derating is needed for sizing.
- What panel tilt works best in Fort Worth?
- At Fort Worth's latitude (33°), a fixed tilt near 33° balances year-round yield. Winter-heavy loads favor latitude + 15°; summer-heavy, latitude − 15°.