That might explain it. But the data below is based at the airport..so it depends on where the airport is, relative to most of the city. I suppose that the summer rains are monsoon thunderstorms which can be quite spotty. And I imagine your winter snows are a bit dry -- low in moisture, so a lot of snow does not equal a lot of precipitation.
3.23 4.89 3.97 4.90 4.76 3.84 2.57 3.66 7.04 3.91 3.34 4.37 Record Precipitation in.
1.37 1.33 1.91 2.02 2.09 0.77 0.72 0.76 1.33 1.57 1.40 1.23 Average Precipitation in.
You gotta be careful be careful where the rain gauge is! A local coastal community expanded and many home lots put in, with drainage and culvert sizing determined by the closest official data collection location (Humboldt Bay, which averages 42 inches or so). Shelter Cove, where this project was, in reality gets up to 100 inches a year. To say the least, many of the culverts blew out, and many of the lots ended up in the ocean!