Tuesday, June 25, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JUNE 25, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

A MILD MORNING LEADS TO A RAINY AFTERNOON ATOP
GREAT BLUE HILL….

A visibility of 40 miles this morning decreased to 6 miles
throughout the day due to an increasing fog. Rain began
around noontime, leaving 0.05 inches in the gauge by the
1 P.M. observation. Wind was light this morning, but
increased to an average of 15 mph from the southeast.
With mostly cloudy skies and the afternoon rainfall,
temperatures have remained below seasonal averages.
The high so far today is 73F, 5 degrees below the daily
normal of 78F. The low since midnight is 61F, a degree
above the daily normal minimum of 60F.

Today’s Observations:

7 A.M.
Weather: Broken altocumulus and cirrostratus
Temperature: 68F; Dew Point: 62F; Wind: SSE at 5 kts,
Wind: Light
Sea-level pressure: 29.91 ins. Hg, falling then rising
Visibility: 40 miles, smoke layer along the horizon
6-hr Max temp: 68F
6-hr Min temp: 61F
24-hr Precip: 0.00 ins.
BHO SA 1155 E140 BKN 250 BKN 40 130/68/62/1605/991/ K
LYR ALG HRZN WND LGT/ 8/068 50004 10068 20061

10 A.M.
Weather: Overcast altostratus
Temperature: 72F; Dew Point: 66F; Wind: S at 9 kts
Sea-level pressure: 29.92 ins. Hg, rising then falling
Visibility: 30 miles, distant fog
3-hr Precip: 0.00 ins.
BHO SA 1455 E65 OVC 30 133/72/66/1709/992/ DSNT FG ALQDS/
8/02/ 51003

1 P.M.
Weather: Light rain, few stratus fractus, overcast
nimbostratus
Temperature: 69F; Dew Point: 69F; Wind: SSE at 10G19 kts
Sea-level pressure: 29.89 ins. Hg, falling, then more quickly
Visibility: 6 miles, fog
6-hr Max temp: 73F
6-hr Min temp: 68F
6-hr Precip: 0.05 ins.
BHO SA 1755 E65 OVC 6R-F 126/69/69/1610G19/989/ FEW STFA
ALQDS R-CTD/ 8/72/ 6005/ 56007 10073 20068

SUMMARY FOR MONDAY, JUNE 24, 2019

TEMPERATURE (DEGREES F)
MAX…..73   NORMAL…..78
MIN…..61   NORMAL…..60
MEAN….73   NORMAL…..69

DEPARTURE FROM 30-YEAR NORMAL………………….+4
TOTAL DEPARTURE FOR THE MONTH………………….+5 [+0.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE………-1
TOTAL HEATING UNITS FOR THE MONTH…………..33   DEPARTURE……..-36
TOTAL HEATING UNITS FOR THE SEASON………..6252   DEPARTURE…….-119
TOTAL HEATING UNITS LAST SEASON TO DATE……5914   DIFFERENCE……+338

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………8   DEPARTURE………+2
TOTAL COOLING UNITS FOR THE MONTH…………..48   DEPARTURE……..-25
TOTAL COOLING UNITS FOR THE SEASON………….56   DEPARTURE……..-41
TOTAL COOLING UNITS LAST SEASON TO DATE…….125   DEPARTURE……..-69

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..22 NW  AT 12:08 P.M.
AERO…………………….21 WNW AT 11:53 A.M.
ASOS…………………….21 NW  AT 12:08 P.M.
DAVIS……………………21 WSW AT 12:08 P.M. RMY 22
FASTEST MILE FOR YESTERDAY………………….15 WNW AT  5:40 A.M
MAXIMUM 2-MINUTE ASOS AVERAGE……………….15 NW  AT 11:33 A.M
MAXIMUM 2-MINUTE DAVIS AVERAGE………………16 W   AT 11:32 A.M
AVERAGE WIND SPEED AND DIRECTION…………..8.1 WNW
ASOS…………………..8.2
DAVIS………………….8.8 W [268 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.12
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.48  DEPARTURE……-0.14
ASOS…………..3.46
TOTAL PRECIPITATION FOR THE YEAR……….29.27  DEPARTURE……+2.99
ASOS………….29.19

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 71/54/63/+1/0.00/551/61               21 E   AERO 20 E   RMY 18
06/02 75/51/63/+1/…./417/46               23 S   AERO 21 S   RMY N/A
06/03 69/50/60/-2/…./753/83               41 W   AERO 39 W   RMY 43
06/04 70/45/58/-5/0.00/717/79               29 W   AERO 23 W   RMY N/A
06/05 81/57/69/+6/…./527/58               33 SSW AERO 33 SSW RMY N/A
06/06 75/64/70/+6/…./428/47               28 SSW AERO 28 SSW RMY N/A
06/07 80/59/70/+6/0.00/692/76               23 S   AERO 23 S   RMY 22
06/08 78/57/68/+4/0.00/885/97               23 ENE AERO 21 SW  RMY 21
06/09 78/55/67/+3/0.00/840/92               22 S   AERO 21 S   RMY 21
06/10 79/54/67/+2/…./712/78               26 SSE AERO 25 SSE RMY 33
06/11 73/58/66/+1/…./247/27               32 NW  AERO 30 NW  RMY 35
06/12 75/52/64/-1/…./869/95               25 SSW AERO 25 S   RMY 28
06/13 55/49/52/-13/…./…/..              36 NE  AERO 35 NE  RMY 35
06/14 72/50/61/-5/0.00/…/..               38 W   AERO 39 W   RMY 38
06/15 79/54/67/+1/0.00/…/..               38 SSW AERO 41 SSW RMY 40
06/16 70/62/66/0/…./…/..                32 SW  AERO 35 SW  RMY N/A
06/17 74/62/68/+1/…./…/..               12 SSE AERO 18 NW  RMY 17
06/18 71/62/67/0/…./…/..                17*S   AERO 17 S   RMY 16
06/19 74/61/68/+1/…./…/..               16 SSE AERO 20 SSE RMY 19
06/20 69/61/65/-3/…./…/..               26 S   AERO 26 S   RMY 29
06/21 68/58/63/-5/…./…/..               32 NW  AERO 28 NW  RMY 33
06/22 77/56/67/-1/…./…/..               33 NW  AERO 32 NW  RMY 35
06/23 82/59/71/+3/…./…/..               30 NW  AERO 25 WNW RMY 29
06/24 84/61/73/+4/…./…/..               22 NW  AERO 21 NW  RMY 22

06/25 Low temp since midnight is 61F; normal low is 60F

*Estimated

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

RECORDS FOR JUNE 25
HIGH 93F IN 1943,1980, 2005
LOW 47F IN 1903
PRECIP 1.38 INS IN 2012
PEAK GUST 51 MPH W IN 1960

RECORDS FOR JUNE 26
HIGH 96F IN 1952
LOW 45F IN 1986
PRECIP 1.52 INS IN 1945
PEAK GUST 48 MPH N IN 1998

TODAY’S REPORT PREPARED BY: Benjamin Turner