BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MAY 9, 2012
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Low clouds and fog developed overnight last night as
warmer more humid arrived. Late yesterday afternoon
gusty south winds reached peak speeds of 40 to 48 MPH
between 4 and 5 P.M. EDT.
Showers which started early yesterday and brought
0.07 inch by early afternoon resumed in the late
and evening into this morning with an additional
0.16 inch measured this morning at 8 A.M. EDT.
More showers and periods of light left another
tenth of an inch by late this morning. The
total rainfall for yesterday and today has so
amounted to a third of an inch.  
 
Today's observations:
 
7 A.M.
Weather: Obscurement with heavy fog, light rain shower occurring,
rain began unknown time, precipitation very light
Temperature: 57F, Dew point: 57F, Wind: SSW at 12 kts,
Sea-level pressure: 29.79 inches Hg, falling
Visibility: 1/4 mile variable, 1/8 to 1/2 miles, except
2 miles briefly to SE and 1 mile S-W
24-hour precip: 0.16 inch
6-hour precip: 0.04 inch
6-hour min. temp: 54F
BHO SA 1155 W3 X 1/4VRW-F 088/57/57/2012/979/ STRA DRFTG OVR SMT
VSBY 1/8V1/2 BRFLY SE 2 S-W 1 RBUKN/ 8//// 55004
MANUAL 6004/ ASOS 6004 MANUAL 70016 ASOS 70016 10057 20054
 
10 A.M.
Weather: Obscurement, heavy fog, light rain occurring      
Temperature: 58F, Dew Point: 58F; Wind: S at 10 kts,
Sea-level pressure: 29.76 inches Hg, falling then more slowly 
Visibility: 1/8 mile, light rain, heavy fog
3-hour precip: 0.11 in.
BHO SA 1455 W3 X 1/8R-F 079/58/58/1910/976/ 8//// 56009 MANUAL 6011/
ASOS 60010
 
1 P.M. 
Weather: Low overcast stratus, fractus drifting over summit 
Temperature: 60F, Dew Point: 59F; Wind: S at 12 kts,
Wind: Direction variable SSE-SSW
Sea-level pressure: 29.72 inches Hg, falling then more rapidly
Visibility: 3 miles, variable 2 TO 4 miles, visibility
increased rapidly past hour
6-hour precip: 0.16
6-hour max. temp. 60F
BHO SA 1755 E3 OVC 3VF 063/60/59/1912/972/ STFRA DRFTG OVR SMT
VSBY INCRSD RPDLY PST HR VSBY 2V4 WND 15V21/ 8/6// 58015
ASOS 60015 MANUAL 6016/ 10060 20057
 
WEATHER SUMMARY FOR TUESDAY, MAY 8
 
TEMPERATURE (DEGREES F)
MAX.....57    NORMAL.....64
MIN.....48    NORMAL.....45
MEAN....53    NORMAL.....55
 
DEPARTURE FROM 30-YEAR NORMAL.......................-2
TOTAL DEPARTURE FOR THE MONTH......................-24 [-3.2 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY..............12   DEPARTURE..........+1
TOTAL HEATING UNITS FOR THE MONTH.............113   DEPARTURE.........+16
TOTAL HEATING UNITS FOR THE SEASON...........4827   DEPARTURE.......-1296
TOTAL HEATING UNITS LAST SEASON TO DATE......5973   DIFFERENCE......-1146
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............40 S   AT  3:33 P.M. *
                   AERO..................45 S   AT  3:31 P.M.
                   ASOS..................45 S   AT  3:31 P.M. 
                   DAVIS.................43 S   AT  3:31 P.M. RMY 46
THE FASTEST MILE FOR YESTERDAY...........31 S   AT  4:07 P.M. *  
MAXIMUM 2-MINUTE ASOS AVERAGE............32 S   AT  3:45 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........31 S   AT  3:45 P.M.
AVERAGE WIND SPEED AND DIRECTION.......17.0 S
                   ASOS................16.4
                   DAVIS...............15.4 S  [180 deg.]
* last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.16   DEPARTURE..........-0.04
                         ASOS..............0.16
TOTAL PRECIPITATION FOR THE MONTH..........1.06   DEPARTURE..........+0.07
                         ASOS..............1.03
TOTAL PRECIPITATION FOR THE YEAR..........10.67   DEPARTURE..........-8.87
                         ASOS.............10.76
     
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..............24.2    DEPARTURE.........-35.9
 
PRELIMINARY CLIMATE SUMMARY FOR MAY 2012 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
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
 
5/1  47/42/45/-8/0.65/0.0/000/00    33 SE  AERO 36 MPH SE  RMY 37
5/2  50/43/47/-6/0.05/0.0/000/00    16 ENE AERO 16 MPH ENE RMY 17
5/3  51/44/48/-5/0.08/0.0/000/00    14 SSE AERO 16 MPH SSE RMY N/A
5/4  56/47/52/-2/0.01/0.0/000/00    21 SSW AERO 25 MPH SSW RMY 23
5/5  57/46/52/-2/0.04/0.0/034/04    14 NE  AERO 15 MPH NE  RMY 15
5/6  58/45/52/-2/0.00/0.0/532/62    21 ENE AERO 21 MPH ENE RMY 21
5/7  67/48/58/+3/0.00/0.0/.../..    23 S   AERO 25 MPH S   RMY 25
5/8  57/48/53/-2/..../0.0/000/00    40 S   AERO 46 MPH S   RMY 46
 
5/9  morning low temp: 54F; the normal low is now 46F
 
DAILY RECORDS FOR MAY 2012
None so far.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MAY 9
HIGH 93F IN 2000
LOW 31F IN 1947
PRECIP 2.72 INCHES IN 1954
SNOWFALL 5.0 INS IN 1977 (RECORD FOR MAY)
PEAK GUST 70e MPH NE IN 1977
 
RECORDS FOR MAY 10
HIGH 93F IN 1896
LOW 29F IN 1900
PRE 1.85 INS IN 1998
SNOW 2.8 INS 1977 (7.8 INS TOTAL 5/9-5/10 1977)
PEAK GUST 64 MPH S IN 1990
 
TODAY'S REPORT PREPARED BY: Robert Skilling