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And the cooking temperature of some solar ovens is fairly low, in the range of 250 to 300 degrees F. If is is rainy or very cloudy, you cannot cook using a solar oven even during the middle of the day. There is not enough energy from the sun on cloudy days to cook using a typical solar oven.
The average gas temperature of the solar surface is about 6050 K, but inside a sunspot, the gas temperature is only 4200 K. The reason a sunspot appears dark is that the gas inside the spot where the magnetic field is strongest is only emitting about 1/4 as much light as from the rest of the solar surface.