BLUE HILL METEOROLOGICAL OBSERVATORY 
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JUNE 18, 2012 
ALL TIMES ARE IN EASTERN STANDARD TIME

ONE MORE VERY COOL JUNE DAY IN A VERY COOL MONTH
ONLY 3 DAYS JUNE 9-11 AVERAGED ABOVE NORMAL TEMPS. 
JUNE RAINFALL FALLING BELOW NORMAL   

Starting with a low of 50F this morning means the 
day will easily wind up in the minus column 
for daily June temperature.  Only 3 days have 
averaged slightly above normal this month. The 
normal low is now 68 and normal high is 76F.
At best today will average 6 degrees cooler than normal.  
Absence of rainfall for several days now brings the
monthly precipitation departure down below normal. 
 
Today's observations:
 
7 A.M.
Weather: Broken stratocumulus, broken cirrus, cirrus visible distant SW 
Temperature: 57F, Dew Point: 50F; Wind: ESE at 4 kts,
Wind: Light 
Sea-level pressure: 30.17 inches Hg, rising slightly  
Visibility: 25 miles, thin fog and hazy
6-hour min. temp: 50F
BHO SA 1155 E17 BKN 220 BKN 25 217/57/50/1104/017/ CI VSB DSNT SW THN F
AND HAZY ALQDS VSBY SE 35 8/501 53004 10057 20050 
 
10 A.M. 
Weather: Scattered cumulus, few statocumulus distant NE-ESE 
Temperature: 64F, Dew Point: 50F; Wind: S at 6 kts, 
Wind: Light  
Sea-level pressure: 30.17 inches Hg, rising then falling slightly 
Visibility: 45 miles, except 30 miles W-NW 
BHO SA 1455 24 SCT 220 SCT 45 217/64/50/1706/017/ FEW SC DSNT NE-ENE
VSBY W-NW 30 HAZY AND DSNT HZ XCPT LGT HZ NE-S WND LGT/ 8/801 50000 

1 P.M.
Weather: Scattered cumulus fractus, cumulus, stratocumulus with moderate
cumuloform tops distant NE, thin smoke layer aloft extending NNW-E   
Temperature: 67F, Dew Point: 54F; Wind: NE at 9 kts,
Wind: Direction variable N-E  
Sea-level pressure: 30.17 inches Hg, about steady falling
Visibility: 40 miles, 45 miles WNW, distant haze
6-hour max. temp: 68F   
BHO SA 1755 35 SCT 40 216/67/54/0409/017/ FEW MDT SC/MDT CUFRM TOPS
DSNT NE K LYR ALF XTDNG NNW-E VSBY WNW 45 WND 01V09/ 8/800 55001
10068 20057    

WEATHER SUMMARY FOR SUNDAY, JUNE 17

TEMPERATURE (DEGREES F)
MAX.....67    NORMAL.....76
MIN.....50    NORMAL.....58
MEAN....59    NORMAL.....67
 
DEPARTURE FROM 30-YEAR NORMAL.......................-8
TOTAL DEPARTURE FOR THE MONTH......................-70 [-4.3 DEGREES/DAY]

HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY...............6   DEPARTURE..........+4
TOTAL HEATING UNITS FOR THE MONTH..............87   DEPARTURE.........+31
TOTAL HEATING UNITS FOR THE SEASON...........4975   DEPARTURE.......-1378
TOTAL HEATING UNITS LAST SEASON TO DATE......6223   DIFFERENCE......-1248

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY.............21 E   AT  1:40 P.M. 
                   AERO..................17 E   AT  1:41 P.M. 
                   ASOS..................20 E   AT  1:40 P.M. 
                   DAVIS.................18 NE  AT  1:39 P.M. RMY 19
THE FASTEST MILE FOR YESTERDAY...........14 E   AT  8:10 P.M.  
MAXIMUM 2-MINUTE ASOS AVERAGE............14 ESE AT  8:10 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE...........13 E   AT  6:05 P.M. 
AVERAGE WIND SPEED AND DIRECTION........7.3 E
                   ASOS.................6.6
                   DAVIS................6.8 E [080 deg.]

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..........2.55   DEPARTURE...........-0.17
                         ASOS..............2.47
TOTAL PRECIPITATION FOR THE YEAR..........15.79   DEPARTURE...........-9.59
                         ASOS.............15.72

PRELIMINARY CLIMATE SUMMARY FOR JUNE 2012 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust when significant
RMY:  RMY = R.M. Young wind gust recording system added 8/9/2011
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized

6/1  67/53/60/-2/0.00/742/82        28 ENE AERO 28 MPH ENE RMY 29
6/2  63/52/58/-4/0.80/000/00        39 SE  AERO 39 MPH SE  RMY 40
6/3  62/50/56/-6/0.01/082/09        31 N   AERO 28 MPH N   RMY 29
6/4  50/47/49/-14/0.58/000/00       44 NNE AERO 43 MPH NNE RMY 43
6/5  54/47/51/-12/0.23/009/01       23 NNE AERO 18 MPH NNE RMY N/A 
6/6  63/48/56/-7/0.01/310/34        16 ENE AERO 14 MPH ENE RMY 15 
6/7  70/50/60/-4/0.27/328/36        31 NE  AERO 31 MPH NE  RMY 32 TSTM,1/8" HAIL
6/8  76/51/64/0/0.03/502/55         25 WSW AERO 25 MPH WNW RMY 26 TSTM
6/9  76/56/66/+2/T/822/90           25 WNW AERO 24 MPH WNW RMY 24
6/10 78/56/67/+2/0.00/868/95        21 E   AERO 18 MPH E   RMY 18
6/11 76/55/66/+1/0.00/.../..        23 S   AERO 21 MPH S   RMY 22
6/12 73/57/65/0/0.03/.../..         29 S   AERO 29 MPH S   RMY 30 
6/13 63/60/62/-3/0.59/000/00        25 S   AERO 23 MPH S   RMY N/A
6/14 69/58/64/-2/0.00/.../..        32 NNE AERO 29 MPH NE  RMY 31
6/15 68/54/61/-5/0.00/.../..        28 ENE AERO 24 MPH ENE RMY 25
6/16 64/51/58/-8/T/.../..           28 NE  AERO 24 MPH NE  RMY 27
6/17 67/50/59/-8/0.00/.../..        21 E   AERO 17 MPH E   RMY 19 

6/18 morning low temp: 50F; the normal low is now 58F

DAILY RECORDS FOR JUNE 2012
6/4 - NEW DAILY RECORD LOW MAXIMUM TEMP OF 50F;
surpasses the previous record of 51F in 1891.

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: Robert Skilling/Patrick Peters/Peter Volpe/
                            William Wilson 

If you do not wish to receive this Daily Discussion and
Climate Summary from the Blue Hill Observatory, please
send an email to sitemaster@bluehill.org.