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Saturday started out in the very early AM with clouds and light showers (0.08″ daily total, most fell between 0055-0210), then around sunrise very damp with light-moderate fog and mild, evolving into a partly […]

Here is Saturday – June 23, 2018`s – Historical Climate Summary !

Lowest Barometric Pressure : 29.77″ at 3 a.m.
Highest Barometric Pressure : 29.87″ at  1 p.m.

Lowest Relative Humidity : 59% at 5 p.m. […]

Friday was a cloudy, cooler, wet day with persistent light showers (0.22″) off and on most of the day. Temperatures held mostly in the 60s all day after initial low 70s in the very early AM. Overnight into […]

Here is Friday – June 22, 2018`s – Historical Climate Summary !

Lowest Barometric Pressure : 29.75″ at 3 a.m., 6 p.m.
Highest Barometric Pressure : 29.80″ at  11:59 p.m.

Lowest Relative Humidity : 55% at 3 […]

On May 27, 2018, training thunderstorms severely affected the Ellicott City area with torrential downpours over a short period of time, causing the historic downtown area to flood severely. Main Street turned into […]

Spreadsheet data file for May 2018:

2018-05-Rockville-2.8-WNW

MAY 2018 MONTHLY SUMMARY ROCKVILLE 2.8 WNW MARYLAND
By Kevin Shaw, Observer in Charge

May 2018 featured significantly above normal rainfall […]

Thursday was mostly cloudy, a tad cooler but still muggy, with a light AM shower between 1040 and 1105 (0.05″). Temperatures held mostly in the 70s all day. Overnight into Friday skies were cloudy, with temps only […]

Lowest Barometric Pressure : 29.75″ at 5 p.m.
Highest Barometric Pressure : 29.92″ at  12 a.m.

Lowest Relative Humidity : 59% at 3 p.m.
Highest Relative Humidity : 100% at 4, 6 – 8 a.m., 7, 11, 11:59 p.m. […]

Wednesday was partly cloudy, cooler and drier in the AM, but clouded over in the afternoon and light rain (daily total 0.31″) moved in during the evening (1935-2135), with a modest rain rate of 0.47″/hour @ 1957. […]

Lowest Barometric Pressure : 29.89″ at 6, 7 p.m.
Highest Barometric Pressure : 30.00″ at  9, 11 a.m.

Lowest Relative Humidity : 69% at 12 p.m.
Highest Relative Humidity : 100% at 11 p.m.

Lowest Dew Point […]

This is going to be real quick, but after a decent thunderstorm near The Dalles on Saturday and a big storm with outflow winds, for the Portland Metro on Sunday – today we’re going to have another good shot at […]

This is going to be real quick, but after a decent thunderstorm near The Dalles on Saturday and a big storm with outflow winds, for the Portland Metro on Sunday – today we’re going to have another good shot at […]

Tuesday featured several changes throughout the day. The morning after sunrise was sunny and hot, as the high air and dew point temperatures for the day were reached a few minutes prior to noon. The afternoon […]

Lowest Barometric Pressure : 29.98″ at 6 – 9 p.m.
Highest Barometric Pressure : 30.11″ at  9 a.m.

Lowest Relative Humidity : 47% at 2 p.m.
Highest Relative Humidity : 100% at 5 a.m.

Lowest Dew Point Tempe […]

It seems that the 90s are gone for a while and temperatures are back to where they should be.  That’s a relief.  I don’t do well at all when temps get much above 80°F.  We received a few showers late yesterday whi […]

Monday was a mostly to partly sunny, hazy, hot, humid day with clouds coming in during the later stages of the afternoon that put a lid on the increasing temperature. The clouds resulted from a line of storms […]

Here is Monday – June 18, 2018`s – Historical Climate Summary !

Lowest Barometric Pressure : 30.04″ at 7 p.m.
Highest Barometric Pressure : 30.17″ at  9, 10 a.m.

Lowest Relative Humidity : 46% at 3 p.m. […]

Yesterday was just too hot to even step outdoors with highs reaching 93°F.  Fortunately, thunderstorms will be passing through later today and bringing cooler air with it.  On the down side, there is a chance fo […]

Sunday was a mostly sunny but hazier day with high clouds at times esp in the AM, and a warmer, more humid day. Temperatures started out around 70° in the early AM then rose just short of 90° by mid-afternoon. O […]