Signal strength varies with the day

AP about 100 ft away, seems to grow weak in the evening. Strongest in 
early hours (before 10 a.m.), but quickly drops off. (This is between 
2 apartment buildings.)

Being N. California, I'd expect the opposite, that moisture would 
inhibit signal propagation. Nighttime and early hours are moist, 
especially in fall & winter, times that the signal seems to be 
stronger.

Any idea why signal strength would be so weak during the day but 
stronger during the night? It doesn't seem to follow logic of 
interference, which I would expect to be intermittent (temporary use 
of cordless phones, etc.). MacStumbler shows no other networks 
present when this one network signal fades.

Ideas?

Thanks,
Dave
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