Friday, June 19, 2020

| June 19, 2020 | Reply

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

FRIDAY, JUNE 19, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

WARMTH AND HUMIDITY ROLL ON ATOP GREAT BLUE
HILL…

We arrived at the hill under mostly cloudy
skies and distant fog. Air temperature was
already at 70 degrees at 7AM with an overnight
low of only 66 degrees. As the morning progressed,
the clouds and fog thinned allowing visibility to
reach 75 miles by early afternoon. Temperatures
have responded to this increasing sunshine – achieving
84 degrees by early afternoon with dew points
holding in the mid-60s. Winds remain rather
gentle for our location peaking at 21 MPH so far.

Great Blue Hill is officially in an abnormally
dry pattern. The on-going drought places us at
0.95 inches below the monthly normal, yet nearly
4 inches below the average for the year! There
does not appear to be any notable rainmakers over
the next several days.

Quick fun fact: Today marks the last full day of
astronomical spring. At 5:43 EDT tomorrow, summer
officially commences for us here in the Northern
Hemisphere. This day marks the longest duration
of sunlight of the year peaking at 15 hours &
17 minutes locally. It also marks our maximum
sun angle at solar noon of 71.0 degrees above
the horizon. For comparison, our minimum sun
angle at the December winter solstice is 24.1
degrees!

The high so far today is 84 degrees, this
is 8 degrees above the daily normal high
of 76F. The low since midnight is 66F,
which is 8 degrees above the daily normal
low of 58F.

Today’s Observations:

7 A.M.
Weather: Broken Stratocumulus
Temperature: 70F; Dew Point: 65F; Relative Humidity: 85%
Wind: WSW at 8G17 kts
Sea-level pressure: 30.14 ins. Hg: rising, then more rapidly
Visibility: 45 miles, distant fog
6-hr Max temp: 70F
6-hr Min temp: 66F
24-hr Precip:  0.00 ins
24-hr Snowfall: 0.0 ins.
BHO SA 1155 E15 BKN 45 207/70/65/2408G17/014/ THN F ALQDS/
8/400 53005 10070 20066

10 A.M.
Weather: Scattered Cumulus (few altocumulus distant E-S)
Temperature: 79F; Dew Point: 66F; Relative Humidity: 66%
Wind: WSW at 9G16 kts
Sea-level pressure: 30.13 ins. Hg: steady, then falling
Visibility: 75 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 25 SCT 75 203/79/66/2509G16/013/ FEW AC DSNT E-S/
8/130 58004

1 P.M.
Weather: Scattered Cumulus (few altocumulus distant E-SSW;
few cirrus S)
Temperature: 82F; Dew Point: 64F; Relative Humidity: 55%
Wind: WSW at 7G14 kts
Sea-level pressure: 30.08 ins. Hg: falling, then more rapidly
Visibility: 75 miles
6-hr Max temp: 84F
6-hr Min temp: 70F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 40 SCT 75 187/82/64/2506G14/008/ FEW AC DSNT E-SSW
FEW CI S/ 8/131 58016 10084 20070

SUMMARY FOR THURSDAY, JUNE 18, 2020

TEMPERATURE (DEGREES F)
MAX…..86   NORMAL…..76
MIN…..59   NORMAL…..58
MEAN….73   NORMAL…..67

DEPARTURE FROM 30-YEAR NORMAL………………+6
TOTAL DEPARTURE FOR THE MONTH……………..+24 [+1.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE……. -2
TOTAL HEATING UNITS FOR THE MONTH……………40  DEPARTURE…….-20
TOTAL HEATING UNITS FOR THE SEASON…………5852  DEPARTURE……-511
TOTAL HEATING UNITS LAST SEASON TO DATE…….6252  DEPARTURE……-400

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………… 8  DEPARTURE……. +4
TOTAL COOLING UNITS FOR THE MONTH……………53  DEPARTURE……..+6
TOTAL COOLING UNITS FOR THE SEASON…………..85  DEPARTURE…….+14
TOTAL COOLING UNITS LAST SEASON TO DATE………37  DEPARTURE…….+48

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..22 S   AT  2:09 P.M.
AERO…………………….22 SSW AT  5:41 P.M.
ASOS…………………….22 SSW AT  5:42 P.M.
DAVIS……………………23 S   AT  5:37 P.M. RMY 22
FASTEST MILE FOR YESTERDAY………………….16 SW  AT  6:36 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….16 SW  AT  6:34 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………16 SSW AT  3:50 P.M.
AVERAGE WIND SPEED AND DIRECTION……………9.0 SW
ASOS……………………9.4
DAVIS…………………..8.9 SW [224 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.15
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.91  DEPARTURE……-0.95
ASOS…………..1.91
TOTAL PRECIPITATION FOR THE YEAR……….21.70  DEPARTURE……-3.82
ASOS………….22.22

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  64/42/53/-9/T/0.0/…/..            28 WNW  AERO 29 WNW RMY 28
06/02  72/45/59/-3/…./0.0/…/..         28 W    AERO 27 W   RMY 28
06/03  79/55/67/+5/T/0.0/…/..            29 W    AERO 28 W   RMY 26
06/04  87/62/75/+12/…./0.0/…/..        26 W    AERO 25 S   RMY N/A
06/05  80/65/73/+10/…./0.0/…/..        28 SSW  AERO 28 SSW RMY N/A TSTM
06/06  86/57/72/+9/…./0.0/…/..         55 SW   AERO 59 SW  RMY 59  TSTM
06/07  68/54/61/-3/0.00/0.0/…/..         24 NW   AERO 24 NW  RMY N/A
06/08  77/51/64/0/0.00/0.0/…/..          25 W    AERO 24 W   RMY 25
06/09  77/60/69/+5/T/…/..                23 E    AERO 21 E   RMY N/A
06/10  70/58/64/-1/T/0.0/…/..            25 E    AERO 24 E   RMY N/A
06/11  71/64/68/+3/0.62/0.0/…/..         40 S    AERO 40 S   RMY 42
06/12  82/63/73/+8/0.00/…/..             26 W    AERO 25 W   RMY 27
06/13  71/53/62/-3/0.00/…/..             21 WNW  AERO 20 WNW RMY N/A
06/14  67/49/58/-8/0.00/…/..             21 E    AERO 21 ENE RMY 21
06/15  67/53/60/-6/5/0/…/..              21 NE   AERO 16 ENE RMY 20
06/16  73/54/64/-2/0.00/…/..             18 E    AERO 18 E   RMY 18
06/17  78/57/68/+1/0.00/…/..             20 S    AERO 20 S   RMY 20
06/18  86/59/73/+6/0.00/…/..             22 S    AERO 22 SSW RMY 22

06/19 The low since midnight is 66F, the daily normal low is 58F

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 2.62 INS 1945
PEAK GUST 63 MPH NE IN 1967, SSW IN 2010

TODAY’S REPORT PREPARED BY: Andrew Swanson

Category: Daily Discussions

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