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BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, SEPTEMBER 16, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME
MOSTLY CLOUDY? WITH DECENT VISIBILITY ALL
THINGS CONSIDERED….
Today the sky was mostly, if not fully obscured. That
did not stop the visibility from being 70 miles at the
1 P.M. observation. Today was on the windier side, with
a max gust of 31 mph from the SSW.
The other story is the continued dry conditions. We
could really use some rain as our rainfall deficit
continues to mount. We’ve only recorded 0.51″ of rain
so far in September, this is 1.37 inches below normal
to date. For the year our deficit has dropped to 3.58
inches below normal. Moderate to severe drought
continues to plague the region.
-Rainfall section written by Matthew Douglas
The high so far today is the same as the the daily
normal max. The low since midnight is 49F,
which is 6 degrees below the normal low of 55F.
Today’s Observations:
7 A.M.
Weather: Overcast cirrostratus, few cumulus offshore
Temperature: 54F; Dew Point: 48F; Relative Humidity: 78%
Wind: SSW at 13 kts
Sea-level pressure: 30.26 ins. Hg: rising steadily
Visibility: 65 miles, thin smoke layer
6-hr Max temp: 54F
6-hr Min temp: 49F
24-hr Precip: 0.00 ins.
BHO SA 1155 300 OVC 65 246/54/48/2013/026/ FEW CU OFFSHR THN
K LYR ALQDS/ 8/107 53006 10054 20049
10 A.M.
Weather: Scattered cumulus, broken cirrostratus
Temperature: 66F; Dew Point: 53F; Relative Humidity: 64%
Wind: SSW at 12G22 kts, peak of 31 MPH SSW at 9:24 A.M.
Sea-level pressure: 30.25 ins. Hg: falling, then more slowly
Visibility: 65 miles, thin smoke layer
3-hr Precip: 0.00 ins.
BHO SA 1455 50 SCT 300 BKN 65 241/66/53/2112G22/025/ THN K
LYR ALQDS PK WND 2027/24/ 55002
1 P.M.
Weather: Broken cirrostratus
Temperature: 70F; Dew Point: 51F; Relative Humidity: 51%
Wind: S at 16G22 kts
Sea-level pressure: 30.18 ins. Hg: falling, then more rapidly
Visibility: 70 miles
6-hr Max temp: 72F
6-hr Min temp: 54F
6-hr Precip: 0.00 ins.
BHO SA 1755 300 BKN 70 217/70/51/1916G22/018/ 8/007 58024 10072
20054
SUMMARY FOR TUESDAY, SEPTEMBER 15, 2020
TEMPERATURE (DEGREES F)
MAX…..64 NORMAL…..72
MIN…..44 NORMAL…..55
MEAN….54 NORMAL…..64
DEPARTURE FROM 30-YEAR NORMAL……………. -10
TOTAL DEPARTURE FOR THE MONTH……………. +12 [+0.5 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….11 DEPARTURE……+8
TOTAL HEATING UNITS FOR THE MONTH………….22 DEPARTURE……-9
TOTAL HEATING UNITS FOR THE SEASON…………25 DEPARTURE…..-31
TOTAL HEATING UNITS LAST SEASON TO DATE…….46 DEPARTURE…..-21
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY………… 0 DEPARTURE……-2
TOTAL COOLING UNITS FOR THE MONTH………… 48 DEPARTURE….. +5
TOTAL COOLING UNITS FOR THE SEASON………..805 DEPARTURE….+225
TOTAL COOLING UNITS LAST SEASON TO DATE……647 DEPARTURE….+158
PEAK WIND GUST FOR YESTERDAY (MPH)
420C/Official…………….18 S AT 8:00 P.M.
AERO…………………….17 S AT 8:00 P.M.
ASOS…………………….18 NNW AT 2:12 A.M.
DAVIS……………………19 S AT 8:05 P.M.
RMY N/A MERLIN N/A
FASTEST MILE FOR YESTERDAY………………….14 S AT 8:03 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….14 S AT 8:15 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………13 S AT 8:15 P.M.
AVERAGE WIND SPEED AND DIRECTION……………7.5 NNW
ASOS……………………7.5
DAVIS…………………..7.8 NW [322 deg.]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00 DEPARTURE….-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.51 DEPARTURE….-1.37
ASOS…………..0.51
TOTAL PRECIPITATION FOR THE YEAR……….33.32 DEPARTURE….-3.58
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 The low since midnight is 49F, the daily normal low is 55F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR SEPTEMBER 16
HIGH 91F IN 1939,1941
LOW 39F IN 1984
PRECIP 5.12 INCHES IN 1933 (Hurricane)
PEAK GUST 59 MPH SSE IN 1999
RECORDS FOR SEPTEMBER 17
HIGH 87F IN 2015
LOW 38F IN 1959
PRECIP 2.73 INCHES IN 1933
PEAK GUST 60 MPH WNW IN 1999
TODAY’S REPORT PREPARED BY: Benjamin Turner
