Peak Sun Hours in The Bronx, New York, United States
- Solar zone
- Zone 3 (good)
- Best month
- July (6.2)
- Worst month
- December (1.6)
- Climate
- Temperate · 11.0°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 1.88 | 2.79 | 2.66 | 0.92 | -2.2 | 87 |
| Feb | 2.76 | 3.94 | 3.44 | 1.21 | -1.1 | 85 |
| Mar | 3.84 | 5.45 | 4.18 | 1.53 | 2.9 | 82 |
| Apr | 5.01 | 6.87 | 4.89 | 1.87 | 9.1 | 79 |
| May | 5.60 | 7.72 | 4.77 | 2.23 | 15.0 | 80 |
| Jun | 6.13 | 7.91 | 5.05 | 2.43 | 20.4 | 79 |
| Jul | 6.18 | 7.56 | 5.19 | 2.37 | 24.0 | 74 |
| Aug | 5.46 | 6.74 | 4.92 | 2.07 | 23.4 | 73 |
| Sep | 4.45 | 5.63 | 4.69 | 1.64 | 19.7 | 74 |
| Oct | 3.04 | 4.21 | 3.73 | 1.22 | 12.9 | 78 |
| Nov | 2.15 | 2.99 | 3.10 | 0.95 | 6.5 | 82 |
| Dec | 1.59 | 2.41 | 2.30 | 0.82 | 1.3 | 86 |
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 1.59 kWh/m²/day, 0.77 system efficiency.
About solar in The Bronx
The Bronx, United States has a temperate climate with meaningful seasonal variation in solar resource. Its annual peak sun hours average 4.01 kWh/m²/day, a good solar resource by global standards.
The strongest month in The Bronx is July (summer) at 6.18 kWh/m²/day, and the weakest is December (winter) at 1.59 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.
The Bronx'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 The Bronx?
- The Bronx averages 4.01 peak sun hours per day annually, ranging from 1.59 in December to 6.18 in July.
- How many solar panels do I need in The Bronx?
- Panel count depends on your daily load. At The Bronx's annual average of 4.01 kWh/m²/day, a 5 kWh/day load needs roughly 5 × 400 W panels. Use the calculator above for your actual load.
- What size battery do I need in The Bronx?
- Sizing against The Bronx's worst month (December, 1.59 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 The Bronx's solar resource compare globally?
- The Bronx sits in solar zone 3 out of 5 (where 5 is strongest) at 4.01 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 The Bronx?
- The Bronx's worst month (December) delivers 1.59 kWh/m²/day — about 26% of the summer peak of 6.18. Off-grid systems here typically oversize 1.5–2× or pair with a backup source.
- Do cloudy days significantly affect The Bronx's solar?
- Partly. Diffuse light still produces 10–25% of clear-sky output. The Bronx's 4.01 kWh/m²/day already reflects average cloudiness, so no further derating is needed for sizing.
- What panel tilt works best in The Bronx?
- At The Bronx's latitude (41°), a fixed tilt near 41° balances year-round yield. Winter-heavy loads favor latitude + 15°; summer-heavy, latitude − 15°.