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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JUNE 18, 2018  
ALL TIMES ARE IN EASTERN STANDARD TIME

MODERATE TO STRONG WIND GUST FROM THE SOUTH BRINGS  
HAZY, HOT, AND HUMID CONDITIONS TO GREAT BLUE HILL...

Temperatures continue to be above normal today with a max 
of 83F so far. This is 7 degrees above the daily normal of 
76F. The wind shifted to coming from the south overnight, this  
brought a haze to the area which became thicker as dew points 
increased today. This obscured visibility to 25 miles for most
of the day, with the best visibility early this morning at 35 
miles. 
Compared to the dry air yesterday humidity and dew points have
remained high all day making for poor air quality this afternoon. 
The wind increased today as pressure dropped throughout the day. 
So far today we have had a peak gust of 26 kts (30 MPH) by 
1:00 P.M. Cloud cover also increased with the drop in pressure 
and skies were overcast by 1:00 P.M. 

Today's Observations:

7 A.M.
Weather: Broken altocumulus, broken cirrostratus 
Temperature: 69F; Dew Point: 60F; Wind: SSW at 12G17 kts
Sea-level pressure: 29.98 ins. Hg, falling, then more slowly 
Visibility: 35 miles, distant haze in all directions 
6-hr Max temp: 69F
6-hr Min temp: 64F
24-hr Precip: 0.00 ins.
BHO SA 1155 E180 BKN 250 BKN 35 152/69/60/2112G17/998/ 
DSNT HZ ALQDS/ 8/036 56014 10069 20064

10 A.M.
Weather: Broken cirrostratus 
Temperature: 81F; Dew Point: 66F; Wind: SSW at 14G20 kts
Sea-level pressure: 29.93 ins. Hg, falling, then more slowly 
Visibility: 25 miles, distant haze in all directions 
3-hr Precip: 0.00 ins
BHO SA 1455 E250 BKN 25 137/81/66/2114G20/993/ DSNT HZ ALQDS/ 
8/006 56015 

1 P.M.
Weather: Scattered altocumulus, thin overcast cirrostratus,
break in overcast SSW-W, thin spots in overcast 
Temperature: 82F; Dew Point: 67F; Wind: SSW at 17G24 kts,
Peak wind: 26 kts (30 MPH) SSW at 12:09 P.M.
Sea-level pressure: 29.87 ins. Hg, steady then falling
Visibility: 25 miles, distant haze in all directions
6-hr Max temp: 83F
6-hr Min temp: 68F
6-hr precip: 0.00 ins.
BHO SA 1755 180 SCT E250 –OVC 25 114/82/67/2017G24/987/ BINOVC 
SSW-W THN SPTS IOVC DSNT HZ ALQDS SUN DMLY VSBL PK WND 2026/09/ 
8/036 58023 10083 20068  

SUMMARY FOR SUNDAY, JUNE 17, 2018

TEMPERATURE (DEGREES F)
MAX.....86   NORMAL.....76
MIN.....63   NORMAL.....58
MEAN....75   NORMAL.....67

DEPARTURE FROM 30-YEAR NORMAL.........................+8
TOTAL DEPARTURE FOR THE MONTH........................-19 [-1.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............0   DEPARTURE...........-2
TOTAL HEATING UNITS FOR THE MONTH.............62   DEPARTURE...........+4
TOTAL HEATING UNITS FOR THE SEASON..........5909   DEPARTURE.........-452
TOTAL HEATING UNITS LAST SEASON TO DATE.....5724   DIFFERENCE........+185

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............10   DEPARTURE..........+6
TOTAL COOLING UNITS FOR THE MONTH..............30   DEPARTURE.........-14
TOTAL COOLING UNITS FOR THE SEASON.............92   DEPARTURE.........+24
TOTAL COOLING UNITS LAST SEASON TO DATE.......111   DEPARTURE.........-19

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................23 S   AT 10:36 P.M.
                   AERO.........................22 SSE AT  8:05 P.M. 
                   ASOS.........................25 S   AT 10:36 P.M.
                   DAVIS........................25 M   AT 11:34 P.M.** RMY N/A
FASTEST MILE FOR YESTERDAY......................17 S   AT 10:42 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................17 S   AT 10:43 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE..................18 M   AT 11:37 P.M.**
AVERAGE WIND SPEED AND DIRECTION...............8.1 S
                   ASOS........................8.2
                   DAVIS.......................7.7
**Davis direction malfunctioning 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.14
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.02  DEPARTURE......-1.70
                         ASOS..............1.04  
TOTAL PRECIPITATION FOR THE YEAR..........28.34  DEPARTURE......+3.14
                         ASOS.............29.91

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/.../..         20 SW  AERO 17 SW  RMY 18
6/09 79/58/69/+5/0.00/.../..         22 W   AERO 21 W   RMY 22
6/10 72/56/64/-1/0.00/.../..         20 S   AERO 18 S   RMY 17
6/11 68/51/60/-5/0.00/.../..         21 ENE AERO 20 SSW RMY N/A
6/12 77/49/63/-2/0.00/.../..         37 SW  AERO 37 SW  RMY 39
6/13 74/56/65/0/T/.../..             35 SW  AERO 36 SW  RMY 36
6/14 77/61/69/+3/0.00/.../..         35 W   AERO 36 WNW RMY 37
6/15 68/53/61/-5/0.01/.../..         17 NNW AERO 16 WNW RMY 19
6/16 83/54/69/+3/0.00/.../..         25 NNW AERO 24 NNW RMY 25
6/17 86/63/75/+8/0.00/.../..         23 S   AERO 22 S   RMY N/A

6/18 Low temp since midnight is 64F; normal low is now 58F

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 18
HIGH 93F IN 1929,1994
LOW 39F IN 1920
PRECIP 3.36 INS 1998
PEAK GUST 48e MPH W IN 1943

RECORDS FOR JUNE 19
HIGH 92F IN 1923
LOW 40F IN 1920
PRECIP 3.92 INS 1922
PEAK GUST 66e MPH NW IN 1940

TODAY'S REPORT PREPARED BY: Kaitlin Geagan