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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, JUNE 29, 2018  
ALL TIMES ARE IN EASTERN STANDARD TIME

DRY WEATHER RETURNS WITH BUILDING HEAT

Heavy rain and occasional thunder yesterday resulted in a storm total of
1.29 inches of rain here at Blue Hill from this recent weather system. This
was a welcome rainfall in the face of what has become a sizable rainfall 
deficit over the past couple months. We are now 1.23 inches below normal for 
June precipitation. While thunder was observed, all storms in the area 
yesterday were sub-severe, and the peak wind gust yesterday was only 28mph.

Dry conditions have returned today, and temperatures have risen to their
highest levels since June 18. The high so far today is 85F. This is the 
first in what is forecast to be an extended streak of days with warmer or 
much warmer than normal temperatures in our region. The air was very humid 
this morning thanks to lingering moisture from yesterday, with the dew point 
near 70. By afternoon it was drying out somewhat, with the dew point falling 
back into the mid 60s, still fairly humid. Skies have gone from mostly sunny 
to partly cloudy, with some cumulus clouds developing with the heating of 
the day as well as a few higher clouds passing through.

Today's Observations:

7 A.M.
Weather: Mostly clear, few stratus fractus distant S-SW and NW-NE,
few cirrus distant SE-WSW, thin smoke layer above horizon SE-NW
Temperature: 71F; Dew Point: 69F; Wind: estimated WNW at 5 kts,
Wind: Light
Sea-level pressure: 29.91 ins. Hg, rising, then more slowly
Visibility: 65 miles
6-hr Max temp: 71F
6-hr Min temp: 66F
24-hr Precip: 1.11 ins. 
BHO SA 1155 CLR 65 130/71/69/E3005/991/ FEW STFRA DSNT S-SW AND NW-NE 
FEW CI DSNT SE-WSW THN K LYR ABV HRZN SE-NW WND LGT/ 
8/701 51022 MANUAL 70111 ASOS 70111 10071 20066

10 A.M.
Weather: Mostly clear, few cumulus all quadrants, few cirrus S-NW
Temperature: 79F; Dew Point: 66F; Wind: estimated WNW at 5 kts,
Wind: Light and variable
Sea-level pressure: 29.92 ins. Hg, rising slightly 
Visibility: 60 miles, light distant haze
3-hr Precip: 0.00 ins. 
BHO SA 1455 CLR 60 132/79/66/E3005/992/ FEW CU ALQDS 
FEW CI S-NW LGT DSNT HZ WND L/V/ 8/101 53002 

1 P.M.
Weather: Scattered cumulus (few moderate cumulus SE-W), 
scattered dense cirrus, scattered cirrus
Temperature: 83F; Dew Point: 66F; Wind: W at 7 kts
Sea-level pressure: 29.93 ins. Hg, rising then falling
Visibility: 60 miles, light distant haze
6-hr Max temp: 85F
6-hr Min temp: 71F
6-hr precip: 0.00 ins.
BHO SA 1755 40 SCT 200 SCT 250 SCT 60 135/83/66/2807/993/ 
FEW MDT CU SE-W LGT DSNT HZ/ 8/202 50003 10085 20071

SUMMARY FOR THURSDAY, JUNE 28, 2018

TEMPERATURE (DEGREES F)
MAX.....71   NORMAL.....79
MIN.....63   NORMAL.....61
MEAN....67   NORMAL.....70

DEPARTURE FROM 30-YEAR NORMAL.........................-3
TOTAL DEPARTURE FOR THE MONTH........................-23 [-1.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............0   DEPARTURE...........-1
TOTAL HEATING UNITS FOR THE MONTH.............69   DEPARTURE...........-3
TOTAL HEATING UNITS FOR THE SEASON..........5916   DEPARTURE.........-459
TOTAL HEATING UNITS LAST SEASON TO DATE.....5725   DIFFERENCE........+191

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............2   DEPARTURE..........-3
TOTAL COOLING UNITS FOR THE MONTH..............70   DEPARTURE.........-23
TOTAL COOLING UNITS FOR THE SEASON............132   DEPARTURE.........+15
TOTAL COOLING UNITS LAST SEASON TO DATE.......188   DEPARTURE.........-56

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................28 S  AT 3:43 A.M.
                   AERO.........................26 S  AT 3:43 A.M.
                   ASOS.........................29 S  AT 3:44 A.M.
                   DAVIS........................29 M  AT 3:43 A.M.** RMY N/A
FASTEST MILE FOR YESTERDAY......................21 S  AT 3:43 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................21 S  AT 5:51 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................21 M  AT 3:44 A.M.**
AVERAGE WIND SPEED AND DIRECTION..............13.0 S
                   ASOS.......................13.1
                   DAVIS......................12.9
**Davis direction malfunctioning 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....1.11  DEPARTURE......+1.01
                         ASOS..............1.11
TOTAL PRECIPITATION FOR THE MONTH..........2.85  DEPARTURE......-1.23
                         ASOS..............2.86  
TOTAL PRECIPITATION FOR THE YEAR..........30.17  DEPARTURE......+3.61
                         ASOS.............31.73

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

6/01 78/62/70/+8/T/009/01            21 S   AERO 21 S   RMY N/A
6/02 79/54/67/+5/T/353/39            26 ENE AERO 25 ENE RMY 27
6/03 59/45/52/-10/0.00/816/90        28 ENE AERO 25 ENE RMY N/A  
6/04 52/45/49/-14/0.82/000/00        29 ENE AERO 26 ENE RMY 29
6/05 64/47/56/-7/0.19/173/19         24 N   AERO 21 N   RMY 23  TSTM  
6/06 66/50/58/-5/0.00/373/41         23 S   AERO 21 S   RMY 22
6/07 69/50/60/-4/0.00/282/31         25 S   AERO 25 S   RMY 27 
6/08 79/52/66/+2/0.00/684/75         20 SW  AERO 17 SW  RMY 18
6/09 79/58/69/+5/0.00/767/84         22 W   AERO 21 W   RMY 22
6/10 72/56/64/-1/0.00/593/65         20 S   AERO 18 S   RMY 17
6/11 68/51/60/-5/0.00/594/65         21 ENE AERO 20 SSW RMY N/A
6/12 77/49/63/-2/0.00/814/89         37 SW  AERO 37 SW  RMY 39
6/13 74/56/65/0/T/284/31             35 SW  AERO 36 SW  RMY 36
6/14 77/61/69/+3/0.00/495/54         35 W   AERO 36 WNW RMY 37
6/15 68/53/61/-5/0.01/266/29         17 NNW AERO 16 WNW RMY 19
6/16 83/54/69/+3/0.00/761/83         25 NNW AERO 24 NNW RMY 25
6/17 86/63/75/+8/0.00/807/88         23 S   AERO 22 S   RMY N/A
6/18 86/64/75/+8/0.10/284/31         37 SSW AERO 37 SSW RMY 40  TSTM
6/19 81/64/73/+6/0.01/789/86         31 WSW AERO 32 WSW RMY 32 
6/20 81/58/70/+2/0.00/459/50         22 W   AERO 21 W   RMY 23 
6/21 81/62/72/+4/0.00/706/77         22 E   AERO 18 E   RMY 21 
6/22 75/56/66/-2/0.00/.../..         24 ESE AERO 22 ESE RMY 24
6/23 65/55/60/-8/0.03/.../..         22 ENE AERO 21 NE  RMY 22 
6/24 78/56/67/-2/..../.../..         21 SSW AERO 20 SSW RMY N/A 
6/25 70/56/63/-6/..../.../..         30 N   AERO 29 N   RMY 31  TSTM
6/26 79/53/66/-3/0.00/.../..         24 SSW AERO 24 SSW RMY 25
6/27 78/59/69/0/..../.../..          26 S   AERO 28 S   RMY N/A
6/28 71/63/67/-3/..../000/00         28 S   AERO 26 S   RMY N/A TSTM 

6/29 Low temp since midnight is 66F; normal low is now 61F

DAILY RECORDS FOR JUNE 2018

None so far.

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 191 9
PRECIP 3.04 INS IN 1921
PEAK GUST 51 MPH WNW IN 1957

TODAY'S REPORT PREPARED BY: Jonathan O'Brien