By Reginald Stanley. Posted May 23, 2018, 11:10 PM.

A persistent deep marine layer, aggravated by troughing over the region, was strong enough to produce light rain in parts of the region Monday and Tuesday this week.

Where measurable rain was observed, amounts were light - falling mostly under 1/10 of an inch. Notable exceptions were Beaumont (Cherry Valley) and nearby east Highland, where 0.25 inches and 0.24 inches (courtesy of Peter Michas) were reported respectively. 0.03 inches was also reported in Temecula Valley's Wine Country (courtesy of Jim Sappington). Rain was mostly confined to mountain and foothill locations, as well as portions of the eastern valleys.

Deep marine layer is typical of this time of year, where the phenomena is known colloquially as May Gray or June Gloom. This condition, usually produced by a strong " coastal eddy" , leads to a deep marine layer extending from the beaches up to 70 miles inland. This marine layer burns off on most days, however, on some days it may be strong enough to persist for several days at a time and even produce heavy drizzle.

Here are the rain totals for the WeatherCurrents network and associates: