BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MAY 11, 2016 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
LIGHT WINDS, CLEAR SKIES, AND ABOVE NORMAL TEMPS

The high pressure system over the region gave us another day
of clear skies and warming temperatures.  Only a few distant 
cirrostratus clouds were observed south of the observatory
throughout the day.  Winds remained light and from the northwest.

Temperatures were above normal values.  The minimum early this
morning was 50F, 4F above average.  The maximum temp. by the
1:00PM EST observation was 75F, 10F above average.


Today's Observations:

7 A.M.
Weather: Clear, few cirrostratus distant SSE-SW
Temperature: 58F; Dew Point: 35F; Wind: NW at 7 kts
Sea-level pressure: 30.19 ins. Hg, rising, then less quickly
Visibility: 70 miles
6-hr Max temp: 58F 
6-hr Min temp: 50F
24-hr precip: 0.00 in.
BHO SA 1155 CLR 70 222/58/35/3107/019/ FEW CS DSNT SSE-SW/ 
8/005 51008 10058 20050

10 A.M.
Weather: Clear, few cirrostratus distant SSE-SSW
Temperature: 67F; Dew Point: 32F; Wind: NNW at 9 kts
Sea-level pressure: 30.16 ins. Hg, falling, then more quickly
Visibility: 70 miles
BHO SA 1455 CLR 70 215/67/32/3409/016/ FEW CS DSNT SSE-SSW/ 
8/008 58007

1 P.M.
Weather: Clear, few cirrostratus distant SSE-SW
Temperature: 75F; Dew Point: 33F; Wind: WNW at 8 kts
Wind Direction: Variable WSW-NNW
Sea-level pressure: 30.11 ins. Hg, falling, then more quickly
Visibility: 70 miles
6-hr Max temp: 75F 
6-hr Min temp: 58F
BHO SA 1755 CLR 70 198/75/33/2908/011/ FEW CS DSNT SSE-SW 
WND 24V34/ 8/005 58017 10075 20058

SUMMARY FOR TUESDAY, MAY 10, 2016 
  
TEMPERATURE (DEGREES F)
MAX.....69   NORMAL.....65
MIN.....40   NORMAL.....46 
MEAN....55   NORMAL.....55

DEPARTURE FROM 30-YEAR NORMAL...........................0
TOTAL DEPARTURE FOR THE MONTH.........................-57 [-5.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............10   DEPARTURE...........0
TOTAL HEATING UNITS FOR THE MONTH.............166   DEPARTURE.........+53
TOTAL HEATING UNITS FOR THE SEASON...........5158   DEPARTURE........-990
TOTAL HEATING UNITS LAST SEASON TO DATE......6324   DIFFERENCE......-1166   

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................22 W   AT  5:09 A.M.     
                   ASOS........................24 NW  AT  7:57 A.M.  
                   DAVIS.......................21 WNW AT  7:57 A.M.  RMY 22
FASTEST MILE FOR YESTERDAY.....................15 WNW AT  7:57 A.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE..................16 NW  AT  7:57 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................14 WNW AT  7:57 A.M.  
AVERAGE WIND SPEED AND DIRECTION...............10.3 WNW 
                   ASOS........................10.1
                   DAVIS.......................8.9 W [270 Deg.]
 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.12
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.61  DEPARTURE......+0.45
                         ASOS..............1.59
TOTAL PRECIPITATION FOR THE YEAR..........18.61  DEPARTURE......-1.16 
                         ASOS.............18.59

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)  
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........0.0
TOTAL SNOWFALL FOR THE MONTH..............TRACE  DEPARTURE........0.0
TOTAL SNOWFALL FOR THE SEASON..............57.5  DEPARTURE.......-5.7

PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/ AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized

5/1 52/39/46/-7/0.08/T/000/00               21 S   AERO 22 SE  RMY 20
5/2 50/41/46/-7/0.31/0.0/000/00             20 NE  AERO 21 NE  RMY 18
5/3 48/43/46/-7/0.16/0.0/000/00             16 E   AERO 16 E   RMY 17 
5/4 48/41/45/-9/0.53/0.0/000/00             33 NE  AERO 35 NE  RMY 34
5/5 44/41/43/-11/0.30/0.0/000/00            39 NNE AERO 41 NNE RMY 39
5/6 54/43/49/-5/0.13/0.0/.../..             28 ENE AERO 29 N   RMY 26
5/7 51/43/47/-8/.../0.0/.../..              25 NE  AERO 25 NE  RMY 23
5/8 60/46/53/-2/.../0.0/.../..              47 W   AERO 53 W   RMY 49         
5/9 65/43/54/-1/0.00/0.0/.../..             40 W   AERO 44 W   RMY 40
5/10 69/40/55/0/0.00/0.0/.../..             22 W   AERO 25 WNW RMY 22

5/11 low temp since midnight is 50F; normal low now 46F
     
DAILY RECORDS FOR MAY 2016

5/1/16: DAILY RECORD SNOWFALL OF A TRACE,
TIES PREVIOUS RECORDS SET IN 1905, 1917, 1921, and 1995

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated): 

RECORDS FOR MAY 11
HIGH 90F IN 1993
LOW 28F IN 1900
PRE 1.28 INS IN 1957
SNOW 1.0 INS IN 1907 (LATEST MEASURABLE SNOW ON RECORD)
PEAK GUST 75e MPH NW IN 1945

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

TODAY'S REPORT PREPARED BY: Cece Borries-Strigle