Monday started out on an improving note with fog being swept away in the very early AM by stronger W winds that eventually cleared out the higher clouds also, yielding a partly cloudy, dry, mild day that started cooling off a bit in the evening.  Temperatures started out in the mid 50s at midnight, then gradually lowered most of the day down to the upper-low 40s 24 hours later at the end of the observation day. No rain or drizzle fell all day.

The maximum temperature was 55.4° at 0000.

The minimum temperature was 43.2° at 2359.

Dew point temperatures ranged from a high of 54° @ 0000 down to a low of 33° @ 1818.

Relative humidity values ranged from a high of 96% @ 0000 down to a low of 56% @ 1145.

Barometric pressure ranged from a low of 29.64″ @ 0007 up to a high of 29.89″ @ 2355.

No rain fell on Monday. December 2018 still has a total of 0.44″ of rain.
The year-to-date precipitation is still 59.25″.

You can get my VP2 data on Weatherlink. I have migrated over to Weatherlink 2.0 so I have a new link for my data. You can now access the data through:

https://www.weatherlink.com/map/5aa32916-94c7-4a40-a2d0-0b74abfc8d8f

I am posting daily to weather underground. My ID is KMDROCKV200 and my station is called “Gardens of Traville.” Data is online, normally just about in real-time. The web address for my data on weather underground is: https://www.wunderground.com/personal-weather-station/dashboard?ID=KMDROCKV200

I contribute daily to CoCoRaHS as Rockville 2.8 WNW, Station ID MD-MG-115 on https://www.cocorahs.org/

Please remember that Weather Underground precipitation data reflects what is recorded automatically through the tipping bucket VP2 gauge. And the tipping bucket is producing significantly higher values than my 4 inch gauge. I actually use the data I post to CoCoRaHS from my 4 inch CoCoRaHS gauge I read manually as my “official” precipitation total each day.

Tuesday will have AM clouds and PM sun and colder, with highs in the low 40s and lows in the mid-upper 20s but no chance of rain or snow.

Wednesday will be cloudy and still colder, with highs in the upper 30s and lows in the mid 20s. There’s a chance for some snow flurries that won’t be measurable (they won’t be measurable in all likelihood around the DC area) hence the POP is 0% of measurable precipitation. The mountains out to my W stand a better chance for a bit of measurable snow in favorable locations. 

Thursday should be mostly cloudy with highs around 40° and lows in the upper 20s.

Friday should be mostly sunny and a bit colder, with highs in the upper 30s and lows in the lower-mid 20s.

Saturday should be partly cloudy and a bit colder still, with highs in the mid 30s and lows in the mid 20s. 

Sunday/Monday is up in the air right now. A storm will be to our south that at this point in time is not a sure thing to come this far north and give us some measurable snow. It will be cold enough for snow, it just depends on the track of the storm. 

Monday’s midnight observations included a temperature of 43.2°, relative humidity 72%, barometric pressure 29.89″ and rising, and a dew point of 34.8° with partly to cloudy skies.

Currently at 0854 the temperature is 40.0°, dew point temperature 29°, relative humidity 65%, and barometric pressure at 30.06″ and rising under mostly cloudy (stratocumulus) skies. During the overnight, temperatures dropped off from the low-mid 40s into the upper 30s with an increase in clouds, though right now the clouds are starting to break up. 

Good morning from the Walrus on this Tuesday.