BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, MAY 12, 2011
ALL TIMES ARE IN EASTERN STANDARD TIME
CONTINUED COOL TEMPERATURES WITH VERY LIGHT DRIZZLE
IN THE EARLY AFTERNOON; SUN MAKES A FEW BRIEF
APPEARANCES THROUGH SMALL BREAKS IN OVERCAST
Temperatures remain a few degrees below normal for
the third straight day as the sun stays hidden
behind overcast skies. Only a few brief breaks in
the overcast occurred during the day today with
just a few minutes of sunshine breaking through.
Very light drizzle was observed briefly early
this afternoon.
Today's observations:
7 A.M.
Weather: Overcast stratocumulus, break in overcast distant
southwest thru northwest
Temperature: 59F, Dew point: 41F; Wind: NNE at 14G19 kts
Sea-level pressure: 30.11 inches Hg, rising
Visibility: 60 miles
24-hour precip: 0.06 in.
6-hour min. temp: 48F
BHO SA 1155 E25 OVC 60 195/59/41/0214G19/011/ BINOVC DSNT SW-NW/
8/5// 51010 MANUAL 70006 ASOS 70006 10050 20048
10 A.M.
Weather: Overcast stratocumulus
Temperature: 50F, Dew point: 43F; Wind: NNE at 13G26 kts,
Wind: Peak wind 26 kts NE at 9:47 AM EST
Wind: Direction variable NNW-E
Sea-level pressure: 30.09 inches Hg, falling
Visibility: 55 miles
BHO SA 1455 E20 OVC 55 190/50/43/0213G26/009/
WND 34V08 PK WND 0526/47/ 8/5// 58005
1 P.M.
Weather: Overcast stratocumulus, light drizzle past hour
Temperature: 54F, Dew point: 46F; Wind: NNE at 11G22 kts,
Wind: Direction variable NW-E
Sea-level pressure: 30.10 inches Hg, rising
Visibility: 50 miles
6-hourly max. temp: 54F
6-hour precip: Trace
BHO SA 1755 E25 OVC 50 192/54/46/0211G22/010/ FEW THN SPTS IOVC
WND 31V90 8/5// 50002 MANUAL 6000/ 10054 20048
WEATHER SUMMARY FOR WEDNESDAY, MAY 11
TEMPERATURE (DEGREES F)
MAX.....59 NORMAL.....65
MIN.....45 NORMAL.....45
MEAN....49 NORMAL.....55
DEPARTURE FROM 30-YEAR NORMAL...................-3
TOTAL DEPARTURE FOR THE MONTH..................+11 [+0.8 DEGREES/DAY]
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............13 DEPARTURE........+3
TOTAL HEATING UNITS FOR THE MONTH...........114 DEPARTURE.......-14
TOTAL HEATING UNITS FOR THE SEASON.........6009 DEPARTURE......-145
TOTAL HEATING UNITS LAST SEASON TO DATE....5557 DIFFERENCE.....+452
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............37 NNE AT 3:13 P.M.*
AEROVANE...............37 NNE AT 4:31 P.M.
ASOS...................36 NNE AT 9:44 P.M.
DAVIS..................38 N AT 2:35 P.M.
THE FASTEST MILE FOR YESTERDAY............23 N AT 3:16 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE.............23 NNE AT 9:44 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE............25 N AT 11:30 A.M.
AVERAGE WIND SPEED AND DIRECTION........14.8 N
ASOS.................13.8
DAVIS................14.6 N [007 DEG]
* last of several occurrences
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M... 0.06 DEPARTURE........-0.04
ASOS..............0.06
TOTAL PRECIPITATION FOR THE MONTH..........1.30 DEPARTURE........-0.05
ASOS..............1.26
TOTAL PRECIPITATION FOR THE YEAR..........19.52 DEPARTURE........+0.22
ASOS..............20.22**
**ASOS data is in error due to system failure on 1/12-13
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.........0.0
TOTAL SNOWFALL FOR THE MONTH................0.0 DEPARTURE........-0.1
TOTAL SNOWFALL FOR THE SEASON..............96.8 DEPARTURE.......+36.7
PRELIMINARY CLIMATE SUMMARY FOR MAY 2011 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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
5/1 55/43/49/-3/0.00/0.0/819/97 30 NE
5/2 73/42/58/+6/0.00/0.0/651/77 24 SSW
5/3 74/51/63/+10/0.00/0.0/441/52 31 SSE
5/4 63/44/54/+1/0.57/0.0/000/00 35 SSE
5/5 58/41/50/-3/0.02/0.0/264/31 47 W
5/6 70/43/57/+3/0.00/0.0/667/78 41 SSE AERO 41 MPH SSE
5/7 71/48/60/+6/0.50/0/0/326/38 29 WNW TSTM
5/8 54/48/51/-3/0.00/0.0/238/27 31 NE
5/9 67/47/57/+2/T/0.0/.../.. 43 N
5/10 53/46/50/-5/.../0.0/.../.. 50 N
5/11 59/45/52/-3/.../0.0/.../.. 37 NNE
5/12 our morning low temp: 48F; the normal low is 46F
DAILY RECORDS FOR MAY 2011
None so far...
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR MAY 12
HIGH 88F IN 2001
LOW 29F IN 1907
PRECIP 1.49 INCHES IN 1968
PEAK GUST 76 MPH S IN 1974
RECORDS FOR MAY 13
HIGH 85F IN 1947
LOW 35F IN 1914, 2005
PRECIP 2.39 INCHES IN 2006
PEAK GUST 49 MPH NNW IN 1965
TODAY'S REPORT PREPARED BY: Stephanie Radner/Caroline Corbett