How much will solar panels produce in Houston?

A 8 kWp system facing south at 35° tilt in Houston produces about 11,494 kWh a year. In a weak year that is 9,565 kWh, in a good one 13,423 kWh — 1,437 kWh per kWp.

That’s about 109% of a typical home’s yearly use (10,500 kWh).

Calculate for my roof

Based on 2014–2023 satellite weather data

Production by month

05001,0001,500JanJanuary: 8 kWp 918 kWh, range 735–1,102FebFebruary: 8 kWp 837 kWh, range 586–1,088MarMarch: 8 kWp 1,023 kWh, range 815–1,231AprApril: 8 kWp 1,019 kWh, range 834–1,205MayMay: 8 kWp 1,063 kWh, range 854–1,272JunJune: 8 kWp 969 kWh, range 787–1,151JulJuly: 8 kWp 1,059 kWh, range 874–1,244AugAugust: 8 kWp 1,045 kWh, range 821–1,270SepSeptember: 8 kWp 1,045 kWh, range 818–1,271OctOctober: 8 kWp 1,096 kWh, range 889–1,303NovNovember: 8 kWp 852 kWh, range 682–1,021DecDecember: 8 kWp 820 kWh, range 587–1,053

kWh per month

A typical day in October

The sunniest month in Houston. Output peaks around 11:00 solar time, at about 4.5 kWh in the best hour.

0:006:0012:0018:0023:00 4.5 0

Month by month

Month Weak year, kWh Typical year, kWh Good year, kWh
January 735 918 1,102
February 586 837 1,088
March 815 1,023 1,231
April 834 1,019 1,205
May 854 1,063 1,272
June 787 969 1,151
July 874 1,059 1,244
August 821 1,045 1,270
September 818 1,045 1,271
October 889 1,096 1,303
November 682 852 1,021
December 587 820 1,053
Year 9,565 11,494 13,423

The months don’t add up exactly to the yearly figure, because each one is the typical value across many years.

Common questions

How much do solar panels produce in winter in Houston?

From November to February the system produces about 3,427 kWh, which is 29% of the year. The weakest month (December) gives roughly 820 kWh.

Is an east-west roof worth it in Houston?

An east-west system typically produces 10–25% less per kWp than one facing south, but spreads production more evenly through the day. The exact difference depends on tilt and shading.

Compare an east-west roof for Houston

Ground mount or roof in Houston?

A ground mount can be tilted and aimed freely, which can add some yield, but it costs more and needs space. Compare both for your own plot.

Check a ground-mounted system in Houston

Your roof is not an average roof

Set your own tilt, direction, shading and inverter limit and get a range for your address.

Calculate for my roof

All cities in United States

Climate data: Photovoltaic Geographical Information System (PVGIS) — European Commission, Joint Research Centre