Saturday, June 19, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SATURDAY, JUNE 19, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0405E
SUNSET: 1924E
WARMER WITH HIGHER HUMIDITY AND SOME BUILDING
CUMULUS IN THE AFTERNOON HOURS….
Today we observed partly cloudy skies and a limited
visibility of 35 miles due to haze. Conditions have
started to improve due to a drop in humidity from
79% this morning to 54% this afternoon.
Pressure is on a steady drop, and building cumulus
have been spotted to the north and west at the
1 P.M. observation.
A trace of rain was seen later on yesterday from a
passing shower, but we are looking for more measurable
precipitation at the moment. The monthly rainfall
deficit is over 1.5 inches, with a yearly deficit
of 3.56 inches. The vegetation on the summit shows
slight stress.
The high so far today is 85F, which is 9 degrees above
the normal high of 76F. The low since midnight is 63F,
which is 4 degrees above the daily normal low of 59F.
Today’s Observations:
7 A.M.
Weather: Scattered altocumulus, broken cirrostratus
Temperature: 66F; Dew Point: 60F; Relative Humidity: 79%
Wind: SSW @ 12G20 kts
Sea-level pressure: 29.75 in. Hg; falling unsteadily
Visibility: 30 miles, hazy
6-hr Max temp: 66F
6-hr Min temp: 63F
24-hr Precip: Trace
BHO SA 1155 110 SCT 250 BKN 30 075/66/60/2012G20/975/ HAZY/ 8/088
70000 56011 10066 20063
10 A.M.
Weather: Scattered altocumulus, broken cirrostratus,
few cumulus to the SW
Temperature: 78F; Dew Point: 64F; Relative Humidity: 63%
Wind: SSW @ 12 kts
Sea-level pressure: 29.73 in Hg; falling, then steady
Visibility: 30 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 110 SCT 250 BKN 30 069/78/64/2112/973/ FEW CU SW HAZY/
8/186 58006
1 P.M.
Weather: Broken cumulus, altocumulus, and cirrostratus
Temperature: 83F, Dew point: 64F; Relative Humidity: 54%
Wind: W @ 11G18 kts
Sea-level pressure: 29.71 in Hg; Falling, then falling more rapidly
Visibility: 35 miles, hazy
6-hr Max temp: 85F
6-hr Min temp: 66F
6-hr Precip: 0.00 ins.
BHO SA 1755 50 BKN 110 BKN 250 BKN 35 063/83/64/2711G18/971/ HAZY/
8/286 58006 10085 20066
SUMMARY FOR FRIDAY, JUNE 18, 2021
TEMPERATURE (DEGREES F)
MAX…….82 NORMAL…..76
MIN…….56 NORMAL…..58
MEAN……69 NORMAL…..67
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……..+2
TOTAL DEPARTURE FOR THE MONTH……………….+84 [+4.5 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL THRU JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………… 0 DEPARTURE…….-2
TOTAL HEATING UNITS FOR THE MONTH……………16 DEPARTURE……-44
TOTAL HEATING UNITS FOR THE SEASON…………5594 DEPARTURE…..-769
TOTAL HEATING UNITS LAST SEASON TO DATE…….5852 DEPARTURE…..-258
COOLING DEGREE DAYS (SEASON JAN THRU DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………….4 DEPARTURE…..+/-0
TOTAL COOLING UNITS FOR THE MONTH……………89 DEPARTURE……+42
TOTAL COOLING UNITS FOR THE SEASON………….118 DEPARTURE……+47
TOTAL COOLING UNITS LAST SEASON TO DATE………85 DEPARTURE……+33
PEAK WIND GUST (MPH):
420C/Official…………..26 WSW @ 1:42 P.M.
AEROVANE (south tower)…..28 WSW @ 1:41 P.M
ASOS…………………..27 WSW @ 1:42 P.M
VECTOR…………………30 @ 4:56 P.M
DAVIS #1……………….27 W @ 3:03 P.M
DAVIS #2 (south tower)…..27 SSW @ 4:56 P.M
RMY……………………30 @ 4:56 P.M
MERLIN…………………N/A
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………20 SW @ 4:54 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 SSW @ 1:42 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..19 @ 9:26 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 W @ 1:43 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 SW @ 4:58 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..19 @ 9:25 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…..11.1 WSW [266 total miles] ASOS………………..11.6
VECTOR………………11.6
DAVIS #1…………….11.5 WSW
DAVIS #2…………….11.7 WSW
RMY…………………11.1 WSW
*=estimated
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………….1.30 DEPARTURE….-1.56
ASOS………….1.25
TOTAL PRECIPITATION FOR THE YEAR………….21.96 DEPARTURE….-3.56
ASOS………..22.11
PRELIMINARY CLIMATE SUMMARY FOR JUNE 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
06/01 74/50/62/0/0.00/425/47 20 WSW AERO 24 WSW RMY 22
06/02 80/55/68/+6/0.00/553/61 28 S AERO 25 S RMY 28
06/03 73/56/65/+3/0.01/073/08 29 SSW AERO 29 SSW RMY 29
06/04 77/61/69/+6/0.02/054/06 23 SW AERO 25 WSW RMY 25 TSTM
06/05 87/60/74/+11/0.00/801/88 32 SSW AERO 37 SSW RMY 35
06/06 91/69/80/+17/0.00/819/90 30 WSW AERO 31 WSW RMY 32
06/07 92/69/81/+17/0.00/519/57 31 SSW AERO 35 SSW RMY 34
06/08 92/69/81/+17/0.06/…/.. 24 WSW AERO 25 WSW RMY 27 TSTM
06/09 88/70/79/+15/0.02/…/.. 21 N AERO 23 NNW RMY 23
06/10 70/53/62/-3/0.00/…/.. 28 NE AERO 28 NE RMY 28
06/11 70/51/61/-4/0.13/…/.. 21 SSE AERO 22 SSE RMY 22
06/12 72/53/63/-2/0.43/…/.. 20 WSW AERO 18 WSW RMY 20
06/13 82/56/69/+4/0.00/…/.. 26 SSW AERO 29 SSW RMY 29
06/14 65/56/61/-5/0.63/…/.. 28 S AERO 30 SSE RMY 29
06/15 77/61/69/+3/T/…/.. 18 NE AERO 20 NE RMY 18 TSTM
06/16 73/56/65/-1/0.00/…/.. 27 NNW AERO 31 NNW RMY 27
06/17 77/52/65/-2/0.00/…/.. 21 WNW AERO 21 NW RMY 23
06/18 82/56/69/+2/T/…/.. 26 WSW AERO 28 WSW RMY 30
06/19 The low since midnight is 63F, the daily normal low is 58F
RECORDS FOR THE MONTH:
High minimum on the 7th of 69F, beating the old record of
66F set in 1922 and 1953.
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR JUNE 19
HIGH 92F IN 1923
LOW 40F IN 1920
PRECIP 3.92 INS 1922
PEAK GUST 66e MPH NW IN 1940
RECORDS FOR JUNE 20
HIGH 94F IN 1953
LOW 41F IN 1918
PRECIP 2.61 INS 1945
PEAK GUST 63 MPH NE IN 1967, SSW IN 2010
TODAY’S REPORT PREPARED BY: Benjamin Turner
