The Rainy Season?

So what is 장마? This is a beautiful picture of the nice blue sky taken out of my window at the office this morning. It was the same on Sunday, Monday and Tuesday as well. I thought there would be a technical definition of 장마, such as a season which produces lots of rain due to a confluence of warm and cold fronts. However, looking in the yahoo 국어 사전 rainstorms that continue for a long period of time (or multiple storms of a continued period of time. I was thinking it might be Chinese based, as in 장기적 for the 장, but the Yahoo dictionary doesn't offer any 한자, and it usually does if it is Chinese based. Anyhow, I wouldn't consider four days of sunshine continuous rain. I seem to remember 장마 as lots of rain for a long time. So far, this 장마, which they claim started early last week has been pretty weak. Maybe we will get the real 장마 in August again, like last year. Maybe someone needs to tell the meteorologists here about El Nino, La Nina, Global Warming, or whatever else could be affecting this and tell them the season shifted.