klepZ ArrayCare

Solar by state / Missouri

Solar potential
in Missouri.

Daily irradiance4.3kWh/m² average, 4.2–4.4 across the state
Per kW installed1,174kWh a year, south-facing at 0.80 PR
Strongest monthJune6.5 kWh/m² a day
National rank23 / 51by sampled irradiance

Missouri averages 4.3 kWh per square metre a day across the 8 grid cells sampled inside it — 23rd of 51 states by that measure. June is the strongest month at 6.5, December the weakest at 1.9.

What that means for an array

On the same assumptions the ArrayCare check uses — a south-facing array and a 0.80 performance ratio — that works out to roughly 1,174 kWh a year for every kW installed, or 8,218 kWh for a 7 kW system. Irradiance is what arrives; production is what a specific array, at a specific tilt, with specific shading and losses, converts. Those are different numbers and a real quote will use the second.

Where in the state

The spread inside Missouri runs from 4.2 kWh/m²/day around Daviess County to 4.4 around Dunklin County — 4% between the dimmest and sunniest sampled cells, or about 47 kWh a year per kW installed. The state reads close to uniform at this resolution, so the average describes it about as well as any local figure would.

How precise this is

These figures come from NASA POWER's solar climatology, a grid of roughly 55 km cells. Two points 40 km apart return the same numbers, which is why this page covers a state and prints the range across 8 sampled cells rather than claiming a figure for a town or a ZIP code. Local terrain, coastal fog and elevation all move the real number at a given address, and none of them are visible at this scale.

Through the year

June runs 3.4× stronger than December. That is a steep seasonal swing: a winter month delivers well under half what a summer one does, and an array sized around the annual figure will run far below it for months at a time.

MonthkWh/m² a daykWh per kW installed
January 2.2 52
February 2.9 62
March 3.9 91
April 5.1 114
May 5.8 134
June 6.5 148
July 6.4 150
August 5.7 133
September 4.8 109
October 3.5 81
November 2.5 56
December 1.9 45

Monthly means across the 8 sampled cells. The per-kW column applies a south-facing orientation and a 0.80 performance ratio to the irradiance beside it — the same arithmetic the array check uses.

The cells behind these numbers

Each row is one NASA POWER grid cell, named for the county its sample point falls in. Two counties in the same cell would return the same numbers, so only one of each appears.

Sample pointkWh/m² a daykWh a year per kW
Dunklin County4.41,200
Stoddard County4.41,200
Hickory County4.31,193
Cape Girardeau County4.21,167
Clay County4.21,162
Osage County4.21,161
Worth County4.21,155
Daviess County4.21,153

Against the rest of the country

For scale, Arizona leads the country at 5.8 kWh/m²/day and Alaska trails at 2.5. The national spread is narrower than most people expect — the sunniest state is not ten times the dimmest, it is about 2.3×.

Sunlight is only one input into whether solar pays somewhere. Electricity prices, net-metering rules, incentives, roof condition and shading routinely matter more than the difference between two neighbouring states, and none of them are on this page. ArrayCare is independent, sells nothing, and is not a quote.

States with similar sun

All 51 states ranked →