BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JUNE 16, 2015 
ALL TIMES ARE IN EASTERN STANDARD TIME

RAIN TAPERS OVERNIGHT, THICK FOG TO START THE DAY

Measurable rain came to an end around midnight this morning,
bringing a storm total of 0.60 inches to the summit. The 
significant rainfall was able to knock back the monthly
deficit to near normal levels; however, the deficit
for the year remains above 3 inches. 

Thick fog this morning reduced visibility at times to
just 1/16 of a mile on the surface, along with just
100 feet of vertical visibility. Temperatures were slow
to rise throughout the morning with fog in place as well,
reaching the 60F degree mark by 9:30 AM EST. Winds have
been remarkably low and completely calm for both the
7:00 AM EST and 10:00 AM EST observations. 

By the 1:00 PM EST observation fog had lifted but plentiful
humidity still existed at 86% and a dew point of 66F. Skies
were overcast with a visibility of 20 miles in most directions
and a maximum temperature of 70F at the observation. 

  
Today's Observations:
 
7 A.M.
Weather: Thick fog
Temperature: 58F; Dew Point: 58F; Wind: CALM
Sea-level pressure: 29.94 ins. Hg, rising then falling and lower
Visibility: 1/8 of a mile, thick fog
6-hr Max temp: 58F
6-hr Min temp: 56F
24-hr precip: 0.37 ins.
BHO SA 1155 W1 X 1/8F 138/58/58/E0000/994/ WND CLM/ 
8//// 58005 ASOS 70041 MANUAL 70037 10058 20056

10 A.M.
Weather: Fog
Temperature: 62F; Dew Point: 62F; Wind: CALM
Sea-level pressure: 29.90 ins. Hg, falling, then more quickly 
Visibility: 1 1/2 miles, partial obscurement of fog  
3-hr precip: none
BHO SA 1455 E3 X- 1 1/2F 126/62/62/E0000/990/ 
WND CLM/ 8//// 58012
 
1 P.M.
Weather: Broken stratocumulus, overcast altostratus
Temperature: 70F; Dew Point: 66F; Wind: estimated SSW at 6 kts
Wind Speed: Light
Sea-level pressure: 29.85 ins. Hg, falling then falling more rapidly 
Visibility: 20 miles, except 15 miles SW-N, thin fog, hazy
6-hr Max temp: 70F
6-hr Min temp: 58F
6-hr precip: none
BHO SA 1755 E12 BKN 50 OVC 20 107/70/66/E2006/985/ 
VSBY SW-N 15 MI THN FG HAZY WND LGT/ 8/51/ 58019 10070 20058


SUMMARY FOR MONDAY, JUNE 15, 2015 
  
TEMPERATURE (DEGREES F)
MAX.....61   NORMAL.....75
MIN.....52   NORMAL.....57
MEAN....57   NORMAL.....66
 
DEPARTURE FROM 30-YEAR NORMAL........................-9
TOTAL DEPARTURE FOR THE MONTH.......................-34 [-2.5 DEGREES/DAY]
 
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............8  DEPARTURE...........+6
TOTAL HEATING UNITS FOR THE MONTH..............86  DEPARTURE..........+32 
TOTAL HEATING UNITS FOR THE SEASON...........6490  DEPARTURE.........+134
TOTAL HEATING UNITS LAST SEASON TO DATE......6421  DIFFERENCE.........+69
 
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............0   DEPARTURE..........-3
TOTAL COOLING UNITS FOR THE MONTH.............41   DEPARTURE..........+4
TOTAL COOLING UNITS FOR THE SEASON............90   DEPARTURE.........+29
TOTAL COOLING UNITS LAST SEASON TO DATE.......41   DIFFERENCE........+49
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..................25  SE   AT   8:03 A.M.                 
                   ASOS.......................25  SE   AT   8:03 A.M.                
                   DAVIS......................26  SE   AT   8:02 A.M. RMY 26
FASTEST MILE FOR YESTERDAY....................18  SE   AT   8:03 A.M.        
MAXIMUM 2-MINUTE ASOS AVERAGE.................20  ESE  AT   3:08 A.M.               
MAXIMUM 2-MINUTE DAVIS AVERAGE................18  SE   AT   8:03 A.M.         
AVERAGE WIND SPEED AND DIRECTION.............11.1 ESE 
                   ASOS......................10.6    
                   DAVIS.....................10.3  SE [126 deg.] 
*last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.37   DEPARTURE....+0.22
                         ASOS...............0.41
TOTAL PRECIPITATION FOR THE MONTH...........2.18   DEPARTURE....-0.25 
                         ASOS...............2.19
TOTAL PRECIPITATION FOR THE YEAR.......... 21.55   DEPARTURE....-3.41                         ASOS...............N/A ***
*** ASOS annual totals not available due to erroneous readings
 
PRELIMINARY CLIMATE SUMMARY FOR JUNE CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY 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

6/1  48/46/47/-15/0.69/000/00              32 NE  RMY 34
6/2  47/44/46/-16/..../000/00              28 NNE RMY 28
6/3  59/44/52/-10/0.00/172/19              16 ESE RMY 16
6/4  63/46/55/-8/0.00/445/49               17 E   RMY 16
6/5  70/49/60/-3/T/500/55                  17 NNE RMY 17
6/6  65/52/59/-4/0.06/382/42               26 ENE RMY 27
6/7  73/49/61/-3/0.00/884/97               28 S   RMY 29
6/8  73/50/62/-2/T/310/34                  41 SSW RMY 48
6/9  76/61/69/+4/0.03/228/25               29 SSW RMY 32  
6/10 82/57/70/+5/0.00/840/92               24 WSW RMY N/A  
6/11 85/61/73/+8/0.00/.../..               29 SSW RMY 32
6/12 86/65/76/+11/..../.../..              26 S   RMY 29 
6/13 83/67/75/+10/T/.../..                 24 N   RMY 27
6/14 75/61/68/+2/0.00/.../..               21 SSE RMY 21
6/15 61/52/57/-9/..../000/00               25 SE  RMY 26

6/16 low since midnight is 56F; normal low is now 57F
 
DAILY RECORDS FOR JUNE 2015
6/1- NEW RECORD LOW MAXIMUM TEMPERATURE OF 48F
surpasses previous record of 51F in 2004
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated): 

RECORDS FOR JUNE 16
HIGH 92F IN 1891, 1967
LOW 44F IN 1926
PRECIP 2.17 INS IN 1931
PEAK GUST 55 MPH W IN 1958

RECORDS FOR JUNE 17
HIGH 93F IN 1894
LOW 44F IN 1920
PRECIP 2.79 INS 2001 (Sub-Tropical storm ALLISON)
PEAK GUST 55e MPH S IN 1977

TODAY'S REPORT PREPARED BY: Brian Fitzgerald