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BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY, SEPTEMBER 17, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME
A WARMER DAY WITH SMOKE ALOFT AND PARTLY CLOUDY
SKIES….
Today the sky was mostly, if not fully obscured by
smoke. That did not stop the visibility from being
65 miles at the 1 P.M. observation. Today consisted
of a warm southwesterly wind, with a max gust of
26 mph. Pressure dropped off overnight, making way
for partly cloudy skies.
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 1.51 inches below normal
to date. For the year our deficit has dropped to 3.72
inches below normal. Moderate to severe drought
continues to plague the region.
-Rainfall section written by Matthew Douglas
The high so far today is 75F, 4 degrees above
the daily normal max of 71F. The low since midnight
is 57F, which is 3 degrees above the normal low of 54F.
Today’s Observations:
7 A.M.
Weather: Scattered cumulus, broken cirrostratus, smoke
layer aloft
Temperature: 59F; Dew Point: 55F; Relative Humidity: 87%
Wind: SW at 11 kts
Sea-level pressure: 30.04 ins. Hg: falling unsteadily
Visibility: 25 miles
6-hr Max temp: 60F
6-hr Min temp: 57F
24-hr Precip: 0.00 ins.
BHO SA 1155 50 SCT 250 BKN 25 174/59/55/2311/004/ K LYR
ALF/ 8/108 56002 10060 20057
10 A.M.
Weather: Scattered cumulus, broken cirrostratus, smoke
layer aloft
Temperature: 68F; Dew Point: 56F; Relative Humidity: 65%
Wind: WSW at 11G20 kts
Sea-level pressure: 30.05 ins. Hg: falling, then rising
Visibility: 45 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 50 SCT 250 BKN 45 175/68/56/2411G20/005/ K LYR
ALF/ 8/108 50001
1 P.M.
Weather: Scattered cumulus, broken cirrostratus, smoke
layer aloft
Temperature: 75F; Dew Point: 55F; Relative Humidity: 50%
Wind: WSW at 8 kts
Sea-level pressure: 30.00 ins. Hg: falling, then more slowly
Visibility: 65 miles
6-hr Max temp: 75F
6-hr Min temp: 59F
6-hr Precip: 0.00 ins.
BHO SA 1755 50 SCT 250 BKN 65 158/75/55/2408/000/ K LYR ALF/
8/108 56017 10075 20059
SUMMARY FOR WEDNESDAY, SEPTEMBER 16, 2020
TEMPERATURE (DEGREES F)
MAX…..72 NORMAL…..72
MIN…..49 NORMAL…..55
MEAN….61 NORMAL…..63
DEPARTURE FROM 30-YEAR NORMAL……………. -2
TOTAL DEPARTURE FOR THE MONTH……………. +10 [+0.1 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..4 DEPARTURE…….0
TOTAL HEATING UNITS FOR THE MONTH………….26 DEPARTURE……-9
TOTAL HEATING UNITS FOR THE SEASON…………29 DEPARTURE…..-31
TOTAL HEATING UNITS LAST SEASON TO DATE…….48 DEPARTURE…..-19
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY………… 0 DEPARTURE……-2
TOTAL COOLING UNITS FOR THE MONTH………… 48 DEPARTURE….. +3
TOTAL COOLING UNITS FOR THE SEASON………..805 DEPARTURE….+223
TOTAL COOLING UNITS LAST SEASON TO DATE……647 DEPARTURE….+158
PEAK WIND GUST FOR YESTERDAY (MPH)
420C/Official…………….31 SSW AT 9:24 A.M.
AERO…………………….31 SSW AT 11:06 A.M.
ASOS…………………….31 SSW AT 9:24 A.M.
DAVIS……………………33 S AT 1:23 P.M.
RMY 31 MERLIN 33
FASTEST MILE FOR YESTERDAY………………….24 SSW AT 8:40 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….24 SSW AT 10:46 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………24 SSW AT 8:46 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..16.4 SSW
ASOS…………………..16.6
DAVIS………………….15.5 SSW [218 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….-1.51
ASOS…………..0.51
TOTAL PRECIPITATION FOR THE YEAR……….33.32 DEPARTURE….-3.72
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 The low since midnight is 57F, the daily normal low is 54F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
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
RECORDS FOR SEPTEMBER 18
HIGH 88F IN 1906
LOW 36F IN 1919
PRECIP 4.25 INCHES IN 1996
PEAK GUST 77e MPH WNW IN 1948
TODAY’S REPORT PREPARED BY: Benjamin Turner
