BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JUNE 18, 2009   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
CLOUDS BUT NO PRECIPITATION THROUGH 2 P.M.
TEMPS. RISE TO MID 60'S
 
A large area of rain to our southwest and west
today has been very slow to move eastward, and
it was drying up as it did so. Connecticut and
central and western Massachusetts have been
getting rain all morning while not a drop has
fallen here into early afternoon. Temperatures
continue on the cool side for mid-June but have
reached the mid-60's as the air slowly becomes
more humid.
 
Today's observations:
 
7 A.M.  
Weather: Overcast altostratus, few lower altocumulus,
high dense cirrus clouds distant NE-SE, ceiling lower
to the southwest thru northwest, virga overhead thru
south thru west thru north sun dimly visible
Temperature: 57F, Dew point: 53F, Wind: SE at 12 kts
Sea-level pressure: 30.13 inches Hg, rising
Visibility: 40 miles, 50 miles northeast thru southeast,
30 miles southwest thru northwest, precipitation to the
the distant southwest thru northwest
6-hour minimum temp: 52F
24-hour rainfall: 0.00
BHO SA 1155 130 SCT E160 OVC 40 204/57/53/1312/013/
FEW LWR AC CIG LWR SW-NW AND HIER/DENS CI NE-SE
VIRGA OVHD-S-W-N HIER CLD VSB DSNT NE-SE SUN DMLY VSB
VSBY SW-NW 30 NE-SE 50 PCPN DSNT SW-NW/ 8/072 53002
10057 20052
 
10 A.M.  
Weather: Scattered stratocumulus, overcast altocumulus
Temperature: 63F, Dew point: 57F, Wind: SE at 13 kts,
Wind: gust to 20 kts past hour 
Sea-level pressure: 30.10 inches Hg, falling
Visibility: 35 miles, light haze  
BHO SA 1455 20 SCT E140 OVC 35 190/63/57/1313/010/
VIRGA/PCPN DSNT SW-NW LGT HZ GST TO 20 KTS PST HR/
8/57/ 58014
 
1 P.M.  
Weather: Scattered cumulus and stratocumulus,
overcast altocumulus, few bright spots in overcast
Temperature: 65F, Dew point: 57F, Wind: SE at 12 kts,
Wind: gust to 22 kts past hour
Sea-level pressure: 30.07 inches Hg, falling
Visibility: 35 miles, northeast to southeast 50 miles,
southwest to northwest 30 miles, distant precipitation
6-hourly max. temp: 65F
BHO SA 1755 24 SCT 36 SCT E100 OVC 35 182/65/57/1412/007/
FEW MDT CU TOPS FEW BRGHT SPTS IOVC PCPN DSNT SW-NW
VSBY NE-SE 50 SW-NW 30 GST TO 22 KTS PST HR/
8/87/ 56008 10065 20057
 
WEATHER SUMMARY FOR WEDNESDAY, JUNE 17
 
TEMPERATURE (DEGREES F)
MAX.....74    NORMAL.....76
MIN.....50    NORMAL.....56
MEAN....62    NORMAL.....66
 
DEPARTURE FROM 30-YEAR NORMAL...........-4
TOTAL DEPARTURE FOR THE MONTH..........-61 [-3.8 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............3  DEPARTURE.......+1
TOTAL HEATING UNITS FOR THE MONTH............79  DEPARTURE......+26
TOTAL HEATING UNITS FOR THE SEASON.........6203  DEPARTURE.....-150
TOTAL HEATING UNITS LAST SEASON TO DATE....5939  DIFFERENCE....+261
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............28 S   AT 4:35 P.M. 
                   AEROVANE..............24 S   AT 4:35 P.M.   
                   ASOS..................25 S   AT 4:35 P.M.     
                   DAVIS.................26 S   AT 4:34 P.M.        
FASTEST MILE FOR YESTERDAY...............19 S   AT 4:35 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE............21 S   AT 4:36 P.M.       
MAXIMUM 2-MINUTE DAVIS AVERAGE...........19 S   AT 4:36 P.M.      
AVERAGE WIND SPEED AND DIRECTION....... 10.1 S 
                   ASOS.................10.4
                   DAVIS................ 9.0 S [190 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  JUNE..............1.16  DEPARTURE....-1.08
                         ASOS..............1.14 
TOTAL PRECIPITATION FOR THE YEAR..........19.66  DEPARTURE....-4.32
                         ASOS.............20.63 
 
PRELIMINARY CLIMATE SUMMARY FOR JUNE 2009 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
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
6/1  69/41/55/-7/0/706/78          29 SSW    AERO 25 MPH SSW
6/2  76/53/65/+3/T/525/58          28 S      AERO 24 MPH S
6/3  69/54/62/0/T/254/28           23 SSW    
6/4  73/53/63/0/0/327/36           22 SSE    
6/5  64/51/58/-5/0.05/000/00       21 NE
6/6  73/51/62/-1/0.01/428/47       25 SSE
6/7  79/56/68/+4/0/583/64          28 W      AERO 24 MPH W
6/8  73/57/65/+1/0/529/58          18 ENE
6/9  59/51/55/-9/0.10/000/00       27 E
6/10 59/52/56/-8/0.00/000/00       21 NE     AERO 18 MPH NE
6/11 57/52/55/-10/0.17/000/00      23 NNE    AERO 21 MPH NE
6/12 70/53/62/-3/0.43/119/13       30 SSE    AERO 29 MPH SSE
6/13 75/59/67/+2/T/796/87          23 NNE
6/14 63/54/59/-6/0.34/101/11       20 E
6/15 60/52/56/-10/0.06/027/03      20 NE
6/16 64/51/58/-8/T/.../..          22 NNE    AERO 19 MPH NNE
6/17 74/50/62/-4/0/.../..          28 S      AERO 24 MPH S
 
6/18 our morning low temp: 52F; the normal low is now 57F
 
NEW DAILY RECORDS FOR JUNE 2009 TO DATE...
None
 
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