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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JUNE 29, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

THUNDERSTORMS THIS MORNING BRING PERIODS OF SHOWERS...
MOSTLY CLOUDY AND VERY MUGGY TODAY WITH MORE 
THUNDERSTORMS BUILDING THIS AFTERNOON...

Thunderstorms began moving through the area before sunrise 
this morning. A thunderstorm was in progress during the 
7 AM EST observation with the heaviest rain and cloud to
ground lightning passing just north and east of the summit. 
After the early morning showers ended before 8 AM EST, the 
sky remained mostly cloudy with middle level clouds during 
the rest of the morning. At 2:30 PM EST, towering cumulus were
visible to the west through northwest as another round of
thunderstorms were forming and moving east. Distant lightning
and thunder were observed through the next hour as thunderstorms
passed south and north of the Observatory, but there was no 
additional rainfall through 4 PM EST. The wind has been 
generally light today with a peak gust to 21 mph NW at
05:53 AM during the morning thunderstorms. The visibility
has been low all day near 30 miles due to the muggy air with
the dew point near 70F and haze in all directions. The high 
so far today is 80F, which is one degree above the daily 
normal of 79F. The low since midnight is 66F, five degrees 
above the daily normal minimum of 61F.   

After a cloudy and cool spring, the first ripe blueberries 
were observed in the enclosure yesterday June 28th, which was 
seven days later than the long term average date of June 21st. 
This was the latest date on which the first ripe blueberries
were observed in the instrument enclosure since June 29th, 1982.

Today's Observations:

7 A.M.
Weather: Thunderstorm with light rain, scattered cumulus
and cumulonimbus, broken stratocumulus, broken altocumulus, 
overcast altostratus, few lower cumulus, patchy ground fog
all quadrants, thunderstorm northeast moving ESE, lightning
in cloud and cloud to ground
Temperature: 66F; Dew Point: 65F; Wind: NE at 7 kts
Sea-level pressure: 30.03 ins. Hg, rising then falling now lower
Visibility: 12 miles, visibility NE 2 miles, SW-NW 15 miles
6-hr Max temp: 72F
6-hr Min temp: 66F
24-hr Precip: 0.28 ins.
BHO SA 1155 40 SCT E55 BKN 70 BKN 100 OVC 12TR- 171/66/65/
0507/003/ FEW LWR CU PTCHY GF ALQDS CB VCNTY STN TS NE 
MVNG ESE LTGICCG VSBY NE 2 SW-NW 15/ 8/22/ 58001 6028/ 
70028 10072 20066

10 A.M.
Weather: Broken altocumulus, overcast altostratus few
stratocumulus, hazy
Temperature: 72F; Dew Point: 67F; Wind: S at 7 kts
Sea-level pressure: 29.99 ins. Hg, falling then more quickly
Visibility: 30 miles, hazy
3-hr Precip: 0.01 ins.
BHO SA 1455 E75 BKN 130 OVC 30 157/72/67/1907/999/ FEW SC 
HAZY/ 8/52/ 58014 6001/

1 P.M.
Weather: Broken altocumulus, overcast altostratus few
moderate cumulus distant NW, few lower altocumulus, 
few breaks in overcast distant WNW-NNW, hazy
Temperature: 78F; Dew Point: 70F; Wind: WSW at 7 kts
Sea-level pressure: 29.92 ins. Hg, falling then more slowly
Visibility: 30 miles
6-hr Max temp: 80F
6-hr Min temp: 66F
6-hr Precip: 0.01 ins. 
BHO SA 1755 E130 BKN 160 OVC 30 133/78/70/2507/992/ FEW MDT 
CU DSNT NW FEW LWR AC FEW BINOVC DSNT WNW-NNW HAZY/ 8/27/ 
56024 6001/ 10080 20066


SUMMARY FOR FRIDAY, JUNE 28, 2019 

TEMPERATURE (DEGREES F)
MAX.....88   NORMAL.....79
MIN.....64   NORMAL.....61
MEAN....75   NORMAL.....70

DEPARTURE FROM 30-YEAR NORMAL......................+5  
TOTAL DEPARTURE FOR THE MONTH.....................+10 [+0.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............0   DEPARTURE.........-1
TOTAL HEATING UNITS FOR THE MONTH..............36   DEPARTURE........-36
TOTAL HEATING UNITS FOR THE SEASON...........6255   DEPARTURE.......-120
TOTAL HEATING UNITS LAST SEASON TO DATE......5916   DIFFERENCE......+339

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............10   DEPARTURE.........+5
TOTAL COOLING UNITS FOR THE MONTH..............70   DEPARTURE........-23
TOTAL COOLING UNITS FOR THE SEASON.............78   DEPARTURE........-39
TOTAL COOLING UNITS LAST SEASON TO DATE.......132   DEPARTURE........-54

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................16 SW  AT 11:25 P.M. *
                   AERO.........................18 SW  AT 10:06 P.M. *
                   ASOS.........................17 WSW AT 23:16 P.M.
                   DAVIS........................17 SW  AT 11:15 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY......................13 SW  AT 11:18 P.M
MAXIMUM 2-MINUTE ASOS AVERAGE...................13 WSW AT 11:18 P.M
MAXIMUM 2-MINUTE DAVIS AVERAGE..................13 SW AT 11:17 P.M
AVERAGE WIND SPEED AND DIRECTION...............8.0 WNW
                   ASOS.......................6.9
                   DAVIS......................6.9 SE [118 deg.]
* Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.28  DEPARTURE......+0.18
                         ASOS..............0.28
TOTAL PRECIPITATION FOR THE MONTH..........3.94  DEPARTURE......-0.14
                         ASOS..............3.91
TOTAL PRECIPITATION FOR THE YEAR..........29.73  DEPARTURE......+2.99
                         ASOS.............29.64

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/+3/0.00/840/93               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/..../000/00              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 73/61/67/-2/0.18/.../..               35 S   AERO 37 S   RMY 37
06/26 77/64/71/+2/0.00/.../..               12 ENE AERO 18 SE  RMY N/A
06/27 81/57/69/0/0.00/.../..                21 NE  AERO 18 NE  RMY N/A
06/28 88/64/75/+5/.../.../..                16 SW  AERO 18 SW  RMY N/A

06/29 Low temp since midnight is 66F; normal low is 61F

*Estimated

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

RECORDS FOR JUNE 29
HIGH 93F IN 1933
LOW 42F IN 1919
PRECIP 1.60 INS IN 1889
PEAK GUST 49 MPH S IN 1957

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

TODAY'S REPORT PREPARED BY: Mike Iacono