Tuesday, June 30, 2020

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

TUESDAY, JUNE 30, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

UNSETTLED WEATHER CONTINUES….

Clouds have been the theme today with periods of drizzle
and very light rain at times. As a result temperatures
have remained on the cool side for this time of year,
holding in the 60s so far today.

Rainfall from yesterday’s thunderstorm and overnight
drizzle amounted to 1.48″ as measured at 7 A.M. this
morning. Since then only a trace has been measured
through 1 P.M., however light rain started just after
the observation.

The high so far today is 67 degrees, this is 12 degrees
below the daily normal high of 79F. The low since midnight
is 62F, which is 1 degrees above the daily normal low of
61F.

Rainfall for the month is now up to 7.56″, which has now
set a surplus for the month of 3.35″. The yearly deficit
is now erased, going from near -4 inches 2 days ago to
to +0.48″ as of 7 A.M. this morning. Impressive in such
a short time!

Today’s Observations:

7 A.M.
Weather: Sky partially obscured, overcast stratus fractus
Temperature: 63F; Dew Point: 63F; Relative Humidity: 100%
Wind: NNE at 5 kts, wind light
Sea-level pressure: 29.92 ins. Hg: rising, then more slowly
Visibility: 2 miles, fog; visibility 1 mile N, 4 S
6-hr Max temp: 63F
6-hr Min temp: 62F
24-hr Precip: 1.48 ins.
24-hr Frozen:  0.0 ins.
BHO SA 1155 –X E1 OVC 2F 131/63/63/0205/992/ STFRA OCCLY DRFTG
OVR SMT VSBY N 1 S 4 LEUKN WND LGT/ 8/6// 51008 6//// 70148
10063 20062

10 A.M.
Weather: Overcast stratus, light drizzle
Temperature: 64F; Dew Point: 62F; Relative Humidity: 96%
Wind: NE at 4 kts, wind light
Sea-level pressure: 29.94 ins. Hg: rising, then more slowly
Visibility: 15 miles, 4 miles N, 6 E
3-hr Precip: Trace
3-hr Frozen:   0.0 ins.
BHO SA 1455 E1 OVC 15L- 139/64/62/0404/994/ THN F ALQDS
VSBY N 9 E 6 LB40 WND LGT/ 8/6// 51008 6000

1 P.M.
Weather: Broken stratus, overcast stratocumulus, rain showers
NW-NE moving W
Temperature: 66F; Dew Point: 64F; Relative Humidity: 93%
Wind: NE at 4 kts, wind light
Sea-level pressure: 29.93 ins. Hg: rising then falling
Visibility: 20 miles, 4 miles NW-NE
6-hr Max temp: 67F
6-hr Min temp: 63F
6-hr Precip: Trace
6-hr Frozen:   0.0 ins.
BHO SA 1755 E10 BKN 35 OVC 20 135/66/64/0504/993/ RW NW-NE MVNG W
VSBY NW-NE 4 WND LGT/ 8/6// 58004 6000/ 10067 20063

SUMMARY FOR MONDAY, JUNE 29, 2020

TEMPERATURE (DEGREES F)
MAX…..71   NORMAL…..79
MIN…..61   NORMAL…..61
MEAN….66   NORMAL…..70

DEPARTURE FROM 30-YEAR NORMAL…………….. -4
TOTAL DEPARTURE FOR THE MONTH……………..+83 [+2.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE……. -1
TOTAL HEATING UNITS FOR THE MONTH……………40  DEPARTURE…….-33
TOTAL HEATING UNITS FOR THE SEASON…………5852  DEPARTURE……-523
TOTAL HEATING UNITS LAST SEASON TO DATE…….6254  DEPARTURE……-402

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………. 1  DEPARTURE……. -5
TOTAL COOLING UNITS FOR THE MONTH……………152  DEPARTURE…….+53
TOTAL COOLING UNITS FOR THE SEASON…………..184  DEPARTURE…….+61
TOTAL COOLING UNITS LAST SEASON TO DATE……….87  DEPARTURE…….+95

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..18 NE  AT 10:22 A.M.
AERO…………………….18 NE  AT 10:17 A.M.
ASOS…………………….19 ENE AT  1:06 P.M.
DAVIS……………………19 E   AT  1:05 P.M RMY 18
FASTEST MILE FOR YESTERDAY………………….13 NE  AT 10:26 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….14 ENE AT  1:06 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………14 E   AT  1:06 P.M.
AVERAGE WIND SPEED AND DIRECTION……………6.3 ENE
ASOS………………….. 6.6
DAVIS…………………. 6.6 ENE [060 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….1.48  DEPARTURE……+1.37
ASOS…………..1.49
TOTAL PRECIPITATION FOR THE MONTH……….7.56  DEPARTURE……+3.35
ASOS…………..7.70
TOTAL PRECIPITATION FOR THE YEAR……….27.35  DEPARTURE……+0.48
ASOS………….28.01

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/0.0/…/..            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/+8/0.00/0.0/…/..         26 W    AERO 25 W   RMY 27
06/13  71/53/62/-3/0.00/0.0/…/..         21 WNW  AERO 20 WNW RMY N/A
06/14  67/49/58/-8/0.00/0.0/…/..         21 E    AERO 21 ENE RMY 21
06/15  67/53/60/-6/5/0/0.0/…/..          21 NE   AERO 16 ENE RMY 20
06/16  73/54/64/-2/0.00/0.0/…/..         18 E    AERO 18 E   RMY 18
06/17  78/57/68/+1/0.00/0.0/…/..         20 S    AERO 20 S   RMY 20
06/18  86/59/73/+6/0.00/0.0/…/..         22 S    AERO 22 SSW RMY 22
06/19  86/66/76/+9/0.00/0.0/…/..         22 S    AERO 22 S   RMY 21
06/20  90/65/78/+10/0.00/0.0/…/..        22 S    AERO 21 S   RMY 21
06/21  90/66/78/+10/0.83/0.0/…/..        33 ESE  AERO 35 ESE RMY 33  TSTM
06/22  77/65/71/+3/0.00/0.0/…/..         15 E    AERO 17 S   RMY 14
06/23  85/65/75/+7/0.00/0.0/…/..         27 S    AERO 24 S   RMY 26
06/24  84/66/75/+6/0.00/0.0/…/..         25 S    AERO 24 S   RMY 25
06/25  84/63/74/+5/0.00/0.0/…/..         29 W    AERO 29 W   RMY 29
06/26  83/65/74/+5/0.02/0.0/…/..         25 S    AERO 25 S   RMY 27
06/27  82/65/74/+5/0.05/0.0/…/..         21 S    AERO 20 S   RMY 20
06/28  84/62/73/+3/3.27/0.0/…/..         35 W    AERO 33 N   RMY 37  TSTM
06/29  71/61/66/-4/…./0.0/…/..         18 NE   AERO 18 NE  RMY 18  TSTM

06/30  The low since midnight is 62F, the daily normal low is 61F

Record rainfall on the 28th of 3.27″. Old record 2.09″ in 1938

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR JUNE 30
HIGH 94F IN 1964
LOW 47F IN 1919
PRECIP 3.04 INS IN 1921
PEAK GUST 51 MPH WNW IN 1957

RECORDS FOR JULY 1
HIGH 98F IN 1964
LOW 44F IN 1988 [RECORD FOR MONTH] PRECIP 4.46 INS IN 1915 [RECORD FOR MONTH] PEAK GUST 52 MPH WNW IN 1974

TODAY’S REPORT PREPARED BY: Matt Douglas