Monday, June 21, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
MONDAY, JUNE 21, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0408E
SUNSET: 1925E
WARM AND QUITE HUMID WITH A FAIR AMOUNT OF CLOUD COVER….
Today has featured a mix of sun and clouds with more
clouds than sun becoming the trend into this afternoon.
Humidity levels have really ramped up today with the
dew point rising into the low 70s. The only saving grace
is the increasing southerly breeze late this morning and
early this afternoon.
The wind has been on the increase since mid morning. The
average speed since 7 A.M. is around 13mph. The peak
gust so far has been 32mph.
Visibility has been limited today starting under 2 miles
this morning due to fog, rising to only 25-30 miles late
this morning into this afternoon due to haziness.
The high so far today is 83F, which is 6 degrees above
the normal high of 77F. The low since midnight is 65F,
which is 6 degrees above the daily normal low of 59F.
Today’s Observations:
7 A.M.
Weather: Overcast stratus, stratus fractus drifting over summit,
sun occasionally dimly visible
Temperature: 69F; Dew Point: 67F; Relative Humidity: 93%
Wind: S @ 10 kts
Sea-level pressure: 29.80 in. Hg; falling then rising
Visibility: 2 miles, fog
6-hr Max temp: 69F
6-hr Min temp: 65F
24-hr Precip: 0.00 ins.
BHO SA 1155 E1 OVC 2F 091/69/67/1810/980/ STFRA DRFTG OVR SMT
SUN OCNLY DIMLY VSBL/ 8/6// 53001 10069 20065
10 A.M.
Weather: Scattered stratocumulus, thin broken cirrus
Temperature: 81F; Dew Point: 70F; Relative Humidity: 70%
Wind: S @ 9G17 kts
Sea-level pressure: 29.79 in Hg; falling, then more rapidly
Visibility: 25 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 30 SCT E250 -BKN 25 081/81/70/1809G17/979/ HAZY/
8/501 58010
1 P.M.
Weather: Broken stratocumulus, thin broken cirrus
Temperature: 82F, Dew point: 72F; Relative Humidity: 72%
Wind: S @ 17G26 kts, peak wind S 32 mph at 12:10 P.M.
Sea-level pressure: 29.70 in Hg; falling, then more rapidly
Visibility: 30 miles, hazy
6-hr Max temp: 83F
6-hr Min temp: 69F
6-hr Precip: 0.00 ins.
BHO SA 1755 E30 BKN 250 -BKN 30 056/82/72/1917G26/970/
HAZY PK WND 1928/10/ 8/501 58025 10083 20069
SUMMARY FOR SUNDAY, JUNE 20, 2021
TEMPERATURE (DEGREES F)
MAX…….85 NORMAL…..76
MIN…….63 NORMAL…..59
MEAN……74 NORMAL…..68
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……..+6
TOTAL DEPARTURE FOR THE MONTH……………….+98 [+4.7 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……-48
TOTAL HEATING UNITS FOR THE SEASON…………5594 DEPARTURE…..-772
TOTAL HEATING UNITS LAST SEASON TO DATE…….5852 DEPARTURE…..-258
COOLING DEGREE DAYS (SEASON JAN THRU DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………… 9 DEPARTURE…….+5
TOTAL COOLING UNITS FOR THE MONTH…………..108 DEPARTURE……+53
TOTAL COOLING UNITS FOR THE SEASON………….137 DEPARTURE……+58
TOTAL COOLING UNITS LAST SEASON TO DATE……..109 DEPARTURE……+28
PEAK WIND GUST (MPH):
420C/Official…………..24 S @ 3:42 P.M.
AEROVANE (south tower)…..25 SSW @ 5:49 P.M.
ASOS…………………..24 S @ 3:42 P.M.
VECTOR #1………………27 @ 4:04 P.M.
VECTOR #2 (south tower)….27 @ 5:49 P.M.
DAVIS #1……………….25 S @ 5:56 P.M.
DAVIS #2 (south tower)…..26 S @ 3:40 P.M.
RMY……………………25 @ 1:17 A.M.
MERLIN…………………23
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………19 S @ 3:42 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….17 S @ 5:57 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..18 @ 5:51 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 SSW @ 5:52 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………19 S @ 5:52 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..18 SSW @ 5:51 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…..10.2 WSW [244 total miles] ASOS………………..10.9
VECTOR #1……………10.6
DAVIS #1…………….10.6 WSW
DAVIS #2…………….10.7 SW
RMY…………………10.2 WSW
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………….1.39 DEPARTURE….-1.75
ASOS………….1.32
TOTAL PRECIPITATION FOR THE YEAR………….22.05 DEPARTURE….-3.75
ASOS………..22.18
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/+17/0.00/838/92 31 SSW AERO 35 SSW RMY 34
06/08 92/69/81/+17/0.06/456/50 24 WSW AERO 25 WSW RMY 27 TSTM
06/09 88/70/79/+15/0.02/530/58 21 N AERO 23 NNW RMY 23
06/10 70/53/62/-3/0.00/795/87 28 NE AERO 28 NE RMY 28
06/11 70/51/61/-4/0.13/411/45 21 SSE AERO 22 SSE RMY 22
06/12 72/53/63/-2/0.43/430/47 20 WSW AERO 18 WSW RMY 20
06/13 82/56/69/+4/0.00/860/94 26 SSW AERO 29 SSW RMY 29
06/14 65/56/61/-5/0.63/027/03 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 86/63/75/+8/0.09/…/.. 30 SW AERO 32 SW RMY 32
06/20 85/63/74/+6/0.00/…/.. 24 S AERO 25 SSW RMY 25
06/21 The low since midnight is 65F, the daily normal low is 59F
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 21
HIGH 94F IN 2012
LOW 42F IN 1940
PRECIP 1.40 INS 1903
PEAK GUST 51 MPH SSW IN 2000
RECORDS FOR JUNE 22
HIGH 93F IN 1921, 2012
LOW 43F IN 1940
PRECIP 1.57 INS IN 1900
PEAK GUST 74 MPH NW IN 1988
TODAY’S REPORT PREPARED BY: Matt Douglas
