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BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

SATURDAY, SEPTEMBER 19, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

COOL WEATHER CONTINUES FOLLOWING THE FRONTAL
PASSAGE….

Today we experienced similar weather to yesterday,
however cooler with clearer skies. The only obscurities
are some fair weather cumulus clouds, and a chilly
easterly wind. Conditions are dry, with dew points in
the upper 20’s and a humidity of 30% at the 1 P.M.
observation. Visibility has reached 85 miles, and has
been constant since 10 A.M.

Furthermore, it has been one week since we recorded our
last measurable precipitation event. This brings us to
exactly 4 inches below the annual normal. While this figure
is not all too noteworthy, most other locations across the
Bay State are seeing substantial deficits. Take for instance
Logan Airport. They are currently at -8.16 inches below average
on the year. Or, take Hanscom/Bedford, which is sitting at
-11.45 inches. And, Chatham is nearing a 12 inch departure! As
of yesterday, 7% of MA is now in an “Extreme Drought” – mainly
focused along the Attleboro, Fall River, and New Bedford corridor.
The rest of the state finds itself in a “Moderate” to “Severe”
drought. The state drought monitor is updated every Thursday.

-Drought section written by Andrew Swanson

With the high pressure system from the north currently
above the region, temperatures are much lower than
seasonal averages. The high so far today is 64F, 7
degrees below the daily normal max of 71F. The low
since midnight is 42F, which is 12 degrees below the
normal low of 54F.

Today’s Observations:

7 A.M.
Weather: Clear, few cumulus NE-SE
Temperature: 45F; Dew Point: 33F; Relative Humidity: 61%
Wind: NNW at 7 kts
Sea-level pressure: 30.28 ins. Hg: rising steadily
Visibility: 80 miles
6-hr Max temp: 46F
6-hr Min temp: 42F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 80 255/45/33/3407/028/ FEW CU NE-SE/ 8/100 53025
10046 20042

10 A.M.
Weather: Clear, few cumulus
Temperature: 57F; Dew Point: 30F; Relative Humidity: 35%
Wind: NNE at 12G19 kts
Sea-level pressure: 30.33 ins. Hg: rising steadily
Visibility: 85 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 85 271/57/30/0211G19/033/ FEW CU ALQDS/
8/100 51016

1 P.M.
Weather: Few cumulus and cirrostratus
Temperature: 58F; Dew Point: 27F; Relative Humidity: 30%
Wind: E at 7G15 kts
Sea-level pressure: 30.32 ins. Hg: rising then falling
Visibility: 85 miles
6-hr Max temp: 58F
6-hr Min temp: 45F
6-hr Precip: 0.00 ins.
BHO SA 1755 CLR 85 269/58/27/0807G15/032/ FEW CU/CS ALQDS/ 8/105
55002 10058 20045

SUMMARY FOR FRIDAY, SEPTEMBER 18, 2020

TEMPERATURE (DEGREES F)
MAX…..64 NORMAL…..71
MIN…..48 NORMAL…..54
MEAN….56 NORMAL…..62

DEPARTURE FROM 30-YEAR NORMAL……………..-6
TOTAL DEPARTURE FOR THE MONTH……………..+8 [+0.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..9 DEPARTURE……+5
TOTAL HEATING UNITS FOR THE MONTH………….35 DEPARTURE……-8
TOTAL HEATING UNITS FOR THE SEASON…………38 DEPARTURE…..-30
TOTAL HEATING UNITS LAST SEASON TO DATE…….65 DEPARTURE…..-27

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY………… 0 DEPARTURE……-2
TOTAL COOLING UNITS FOR THE MONTH………… 50 DEPARTURE….. +2
TOTAL COOLING UNITS FOR THE SEASON………..807 DEPARTURE….+222
TOTAL COOLING UNITS LAST SEASON TO DATE……647 DEPARTURE….+160

PEAK WIND GUST FOR YESTERDAY (MPH)
420C/Official…………….28 NE AT 5:01 A.M.
AERO…………………….30 NNW AT 9:34 P.M.
ASOS…………………….29 NNE AT 5:03 A.M.
DAVIS……………………28 NW AT 9:04 P.M.
RMY N/A MERLIN N/A
FASTEST MILE FOR YESTERDAY………………….18 NE AT 5:04 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18 NE AT 5:03 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………19 NE AT 5:03 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..11.8 NNE (282 total miles)
ASOS…………………..11.7
DAVIS………………….11.9 NE [35 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00 DEPARTURE….-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.51 DEPARTURE….-1.79
ASOS…………..0.51
TOTAL PRECIPITATION FOR THE YEAR……….33.32 DEPARTURE….-4.00
ASOS………….34.09

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY: R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M: Missing data

09/01 76/59/68/0/0.00/…/.. 22 SSE AERO 21 SE RMY 20
09/02 69/59/64/-4/…/…/.. 23 SSE AERO 23 SSE RMY 24
09/03 75/66/71/+4/…/…/.. 22 SSW AERO 21 SSW RMY N/A
09/04 82/62/72/+5/0.00/…/.. 26 WNW AERO 26 WNW RMY 25
09/05 76/55/66/-1/0.00/…/.. 25 W AERO 25 W RMY 24
09/06 78/58/68/+1/0.00/…/.. 24 W AERO 24 W RMY N/A
09/07 79/61/70/+4/0.00/…/.. 27 SSE AERO 30 SSE RMY 28
09/08 82/61/72/+6/0.00/…/.. 17 S AERO 16 S RMY 17
09/09 80/62/71/+5/0.00/…/.. 16 S AERO 15 S RMY 16
09/10 81/69/75/+10/0.28/…/.. 21 SSW AERO 21 SSW RMY N/A
09/11 72/55/64/-1/0.01/…/.. 25 N AERO 25 N RMY N/A
09/12 68/51/60/-5/0.00/…/.. 21 ENE AERO 21 ENE RMY 21
09/13 74/53/64/0/0.00/…/.. 26 SSW AERO 26 SSW RMY 26
09/14 74/50/62/-2/0.00/…/.. 29 NNW AERO 33 NNW RMY 30
09/15 64/44/54/-10/0.00/…/.. 18 S AERO 18 S RMY N/A
09/16 72/49/61/-2/0.00/…/.. 31 SSW AERO 31 SSW RMY 31
09/17 76/57/67/+4/0.00/…/.. 26 WSW AERO 28 W RMY N/A
09/18 64/48/56/-6/0.00/…/.. 28 NE AERO 30 NNW RMY N/A