BLUE HILL METEOROLOGICAL OBSERVATORY 
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JUNE 29, 2011
ALL TIMES ARE IN EASTERN STANDARD TIME
 
WARM, BUT DECREASING HUMIDITY TODAY AFTER
FRONTAL PASSAGE EARLIER TODAY...WEST WINDS
ARE IMPORTING A MUCH DRIER AIR MASS
 
The warming trend that began a few days ago has continued today.
Temperatures are running a few degrees above average, with a morning
low of 66F and an afternoon high of 80F through 2PM EDT.
The passage of a cold front earlier today has brought the beginning
of a change in air mass and much less humid conditions. Dew points
were falling through the 60's by this afternoon.
 
A brief and light shower early today left only a trace of
rainfall. It was all that was left of a line showers and
thunderstorms which moved eastward out of New York state
last evening.  
 
Today's observations:
 
7 A.M.  
Weather: Low overcast stratus, thin fog 
Temperature: 69F, Dew point: 68F; Wind: SSW at 7 kts,
Sea-level pressure: 29.97 inches Hg, rising then falling
Visibility: 3 miles, thin fog 
6-hour min. temp: 66F
6-hour precip: trace
24-hour precip: trace 
BHO SA 1155 E8 OVC 3F 099/69/68/2007/982/ 8/6//
55004 MANUAL 6000/ 10069 20066
 
10 A.M.
Weather: Scattered cumulus, few moderate, scattered dense
cirrus, broken cirrus
Temperature: 77F, Dew point: 66F; Wind: W at 5 kts,
Wind: Light
Sea-level pressure: 29.83 inches Hg, falling
Visibility: 20 miles, hazy
BHO SA 1455 22 SCT 220 SCT E250 BKN 25 101/77/66/2805/983/
FEW MDT CU PTCHS DNS CI FEW CC HAZY WND LGT/
8/202 50002
 
1 P.M.
Weather: Scattered cumulus and moderate cumulus, scattered dense cirrus,
thin broken cirrus
Temperature: 80F, Dew point: 63F; Wind: W at 10 kts,
Wind: Direction variable SW-WNW
Sea-level pressure: 29.81 inches Hg, falling
Visibility: 35 miles, 45 miles WNW, light distant haze
6-hour max temp: 80F 
BHO SA 1755 38 SCT 220 SCT 250 –BKN 35 095/80/63/2610/981/
MDT CU ALQDS PTCHS DNS CI WND 23V29/
8/202 58006 10080 20069
 
WEATHER SUMMARY FOR TUESDAY, JUNE 28
 
TEMPERATURE (DEGREES F)
MAX.....82    NORMAL.....78
MIN.....64    NORMAL.....59
MEAN....73    NORMAL.....69
 
DEPARTURE FROM 30-YEAR NORMAL....................+4
TOTAL DEPARTURE FOR THE MONTH...................-16 [-0.8 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............0    DEPARTURE.........-1
TOTAL HEATING UNITS FOR THE MONTH............86    DEPARTURE........+14
TOTAL HEATING UNITS FOR THE SEASON.........6239    DEPARTURE.......-130
TOTAL HEATING UNITS LAST SEASON TO DATE....5678    DIFFERENCE......+561
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............20 S   AT  6:45 P.M.
                   AEROVANE...............22 S   AT  6:45 P.M.
                   ASOS...................21 S   AT  7:28 P.M. 
                   DAVIS..................17 SE  AT  6:43 P.M. 
THE FASTEST MILE FOR YESTERDAY............16 S   AT  6:50 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE.............15 S   AT  8:15 P.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE............13 SSE AT  6:49 P.M. 
AVERAGE WIND SPEED AND DIRECTION.........6.8 SSE
                   ASOS..................6.9
                   DAVIS.................6.2 S [168 deg]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....trace DEPARTURE........-0.13
                         ASOS..............0.00  
TOTAL PRECIPITATION FOR THE MONTH..........5.12  DEPARTURE........+1.45
                         ASOS..............5.04
TOTAL PRECIPITATION FOR THE YEAR..........27.31  DEPARTURE........+1.90
                        ASOS..............27.86**
**ASOS data is in error due to system failure on 1/12-13
 
PRELIMINARY CLIMATE SUMMARY FOR JUNE 2011 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  80/60/70/+8/0.64/425/47         39 S    AERO 44 MPH S TSTM
6/2  72/52/62/0/0.00/697/77          50 WSW  AERO 54 MPH WSW
6/3  69/48/59/-3/0.00/870/96         36 W    AERO 39 MPH WNW
6/4  64/46/55/-8/0.00/881/97         27 NE  
6/5  70/46/58/-5/0.00/854/94         20 N
6/6  75/54/65/+2/0.00/801/88         17 SSE
6/7  85/59/72/+8/0.00/865/95         22 NW
6/8  90/64/77/+13/0.00/756/83        32 SW   TSTM (no rain)
6/9  88/65/77/+13/0.84/347/38        57 W    AERO 60 MPH W TSTM
6/10 74/60/67/+3/0.00/694/76         21 W
6/11 60/50/55/-10/0.83/000/00        28 ENE  AERO 30 MPH ENE
6/12 55/50/53/-12/0.56/000/00        29 N
6/13 64/51/58/-7/0.08/220/24         17 NNE
6/14 56/51/54/-11/0.04/000/00        28 NNW
6/15 70/51/61/-5/T/815/89            27 N
6/16 86/55/71/+5/0.00/870/95         24 SW
6/17 71/62/67/+1/0.12/174/19         41 S    AERO 43 MPH S
6/18 82/60/71/+5/0.00/633/69         22 WSW
6/19 76/59/68/+1/0.00/871/95         24 NW
6/20 79/58/69/+2/0.00/816/89         17 WSW
6/21 80/60/70/+3/0.00/770/84         21 SE
6/22 70/62/66/-1/1.42/000/00         28 E
6/23 62/57/60/-8/0.21/000/00         33 ENE  AERO 36 MPH ENE
6/24 60/56/58/-10/0.08/000/00        28 NE
6/25 68/54/61/-7/0.30/.../..         18 NNW  TSTM *
6/26 78/59/69/+1/0.00/.../..         17 SSW
6/27 80/61/71/+2/0.00/.../..         17 NE
6/28 82/64/73/+4/0.00/.../..         20 S
 
6/29 our overnight low temp: 66F; the normal low 59F
 
* Thunderstorm day added....
 
DAILY RECORDS FOR JUNE 2011
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 1919
PRECIP 3.04 INS IN 1921
PEAK GUST 51 MPH WNW IN 1957
 
TODAY'S REPORT PREPARED BY: Robert Skilling/Erin Abbott