May gets a running start on summer

May's weather, by the numbers.

May's weather, by the numbers. National Weather Service graphic


WALLA WALLA — Although summer officially begins June 21, last month’s weather appears to have given it a kick-start.

Despite a few cool, wet days, dry and warm ruled during May. Average overall temperatures were about 3 degrees above normal.

Daytime highs averaged just above 74 degrees, a mark 4 degrees above normal. The average nighttime low was just shy of 51 degrees, which was about 2 degrees above normal.

The warmest day was May 15 when the high peaked at 89 degrees and the coolest night was May 12 with a low of 40 degrees.

In terms of rainfall, May came up short with 0.84 inches, a mark 1.29 inches below normal. More than half the month’s total precipitation fell on two days, May 8-9, when a total of 0.46 inches was recorded at Walla Walla Regional Airport.

There were only seven days with measurable precipitation of 0.01 inches or more and 24 days with zero or trace precipitation.

Total rainfall for the year is now at 8.05 inches, which is 2.59 inches below normal. Precipitation for the water year, which began in October and runs through next September, is now 11.14 inches, which is 6.52 inches below average.

The highest wind gust during the month was 45 mph on May 4 as measured at Walla Walla Regional Airport.

The outlook for this month calls for above normal temperatures and near normal precipitation.

Normal highs for Walla Walla rise from 75 degrees at the start of June to 84 degrees by July 1. Normal lows rise from 52 degrees to 57 degrees.

Normal precipitation is 1.28 inches based on a 30-year average.

Andy Porter can be reached at or 526-8318.


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