BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, MAY 12, 2013
ALL TIMES ARE IN EASTERN STANDARD TIME
 
GLOOMY START TO THE DAY WITH SOME LIGHT RAIN AND DENSE FOG
VISIBILITY WAS DOWN TO ZERO VARIABLE 1/16 AT THE SUMMIT
ONLY VERY SMALL AMOUNTS OF RAINFALL PAST 24 HOURS 
TEMPERATURES CONTINUE ON THE MILD SIDE
GUSTY WINDS ON SATURDAY
 
The morning began with very dense fog and some light
rain and rain showers.  Visibility was variable between
zero and 1/16 of a mile at 8 A.M. EDT.  The total rainfall
for yesterday and early today was only 0.08 inch. 
The mild weather trend continues with Saturday's high of
70 degrees running 5 degrees above the average for the
date and this morning's low of 57 up 10 degrees on the
plus side of normal. 
 
After lower than average winds so far this month winds yesterday
averaged 16 MPH with peak gusts to around 45 MPH making
Saturday our windiest day since April 19th  Winds have
averaged quite light at 8.4 MPH through the first ten days
of May.
 
Today's observations:
 
7 A.M.
Weather: Obscurement with heavy fog, very light rain occurring
Temperature: 57F; Dew Point: 57F; Wind: S at 7 kts
Sea-level pressure: 29.85 ins. Hg, falling then steady
Visibility: zero variable to 1/16 mile in dense fog
24-hour precip: 0.05 inch
6-hour min. temp: 57F
6-hour precip: 0.01 inch
24-hour precip: 0.05 inch
BHO SA 1155 W2 X 0VR-F 044/57/57/1907/966/ VSBY 0V1/16 PCPN VRY LGT/
8//// 55004 ASOS 60001 MANUAL 6001/ ASOS 70004 MANUAL 70005
10059 20057
 
10 A.M.
Weather: Broken variable to overcast stratus, overcast nimbostratus,
light rain shower occurring with fog, bright spots in overcast   
Temperature: 60F; Dew Point: 59F; Wind: SSW at 7 kts,
Sea-level pressure: 29.63 ins. Hg, falling then falling more slowly
Visibility: 5 miles, light rain shower and fog 
3-hour precip: 0.02 in. 
BHO SA 1455 E5V BKN 60 OVC 5RW-F 034/60/59/2107/963/ 5 BKN V OVC 
BRGHT SPTS IOVC RB35/ 8/72/ 56010 MANUAL 6002/ ASOS 60001
 
WEATHER SUMMARY FOR SATURDAY, MAY 11, 2013
 
TEMPERATURE (DEGREES F)
MAX.....70     NORMAL.....65
MIN.....56     NORMAL.....46
MEAN....63     NORMAL.....56
 
DEPARTURE FROM 30-YEAR NORMAL....................+7
TOTAL DEPARTURE FOR THE MONTH...................+32 [+2.7 DEGREE/DAY]
 
HEATING DEGREE DAYS 
TOTAL HEATING UNITS FOR YESTERDAY.............2   DEPARTURE..........-8
TOTAL HEATING UNITS FOR THE MONTH............87   DEPARTURE.........-36
TOTAL HEATING UNITS FOR THE SEASON.........5609   DEPARTURE........-549
TOTAL HEATING UNITS LAST SEASON TO DATE....4856   DIFFERENCE.......+753
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...............43 SSW AT  12:18 P.M.
                   AERO....................44 SSW AT  12:18 P.M.
                   ASOS....................46 SSW AT  12:18 P.M.
                   DAVIS...................46 SSW AT  12:17 P.M. RMY: 46
THE FASTEST MILE FOR YESTERDAY.............33 SSW AT  12:16 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE..............33 SSW AT  12:16 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.............34 SSW AT  12:16 P.M.
AVERAGE WIND SPEED AND DIRECTION.........16.2 S
                   ASOS..................15.8 
                   DAVIS.................15.2 S [190 deg]
*Last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.05  DEPARTURE...........-0.07
                         ASOS..............0.04
TOTAL PRECIPITATION FOR THE MONTH..........0.91  DEPARTURE...........-0.43
                         ASOS..............0.87
TOTAL PRECIPITATION FOR THE YEAR..........17.29  DEPARTURE...........-2.60
                         ASOS..............N/A*
*ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals
                       
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.............0.0
TOTAL SNOWFALL FOR THE SEASON.............99.0   DEPARTURE...........+36.3
 
PRELIMINARY CLIMATE SUMMARY FOR MAY 2013 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust
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  67/45/56/+3/0.00/845/100        18 E   AERO 16 MPH E   RMY 17
5/2  75/43/59/+6/T/669/79            29 NE  AERO 26 MPH NE  RMY 29
5/3  54/42/48/-5/0.00/706/83         24 NE  AERO 25 MPH NE  RMY 28
5/4  55/40/48/-6/0.00/843/99         21 NE  AERO 23 MPH NE  RMY 23  
5/5  58/37/48/-6/0.00/752/88         17 ENE AERO 17 MPH ENE RMY 20
5/6  66/40/53/-1/0.00/.../..         17 S   AERO 18 MPH S   RMY 20
5/7  77/50/64/+9/0.00/.../..         21 S   AERO 23 MPH S   RMY 25
5/8  71/55/63/+8/0.42/.../..         31 SSE AERO 35 MPH SSE RMY 35 TSTM
5/9  66/56/61/+6/0.41/.../..         16 NE  AERO 16 MPH NE  RMY 18 TSTM
5/10 79/54/66/+11/0.00/.../..        18 S   AERO 21 MPH S   RMY N/A
5/11 70/56/63/+7/..../.../..         43 SSW AERO 44 MPH SSW RMY 46
 
5/12 morning low temp: 57F; the normal low is now 47F
 
DAILY RECORDS FOR MAY 2013
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: Robert Skilling