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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, MAY 19, 2016 
ALL TIMES ARE IN EASTERN STANDARD TIME

LIGHT WINDS, PARTLY CLOUDY SKIES 

Winds were very calm this morning but picked up after the
7:00AM EST observation.  Skies were partly cloudy all day 
with broken altocumulus and few cumulus at lower levels.
Visibility improved from 50 miles to 60 miles by the
10:00AM EST observation and remained at 60 miles.

Temperatures were warmer than normal this morning with a 
minimum of 50F.  They had warmed only to 66F by 1:00PM, just
1F below average.


Today's Observations:

7 A.M. 
Weather: Broken altocumulus
Temperature: 57F; Dew Point: 40F; Wind: Calm
Sea-level pressure: 30.12 ins. Hg, rising, then more slowly 
Visibility: 50 miles
6-hr Max temp: 58F 
6-hr Min temp: 50F
24-hr precip: 0.00 in.
BHO SA 1155 E140 BKN 50 201/57/40/0000/012/ WND LGT AND VRBL/ 
8/080 51009 10058 20050

10 A.M.
Weather: Few cumulus NNW, broken altocumulus
Temperature: 59F; Dew Point: 36F; Wind: estimated NE at 5 kts
Sea-level pressure: 30.12 ins. Hg, rising, then falling
Visibility: 60 miles
BHO SA 1455 E120 BKN 60 200/59/36/E0405/012/ FEW CU NNW WND LGT/ 
8/180 58001

1 P.M.
Weather: Few cumulus SE-N, broken altocumulus
Temperature: 63F; Dew Point: 36F; Wind: estimated ENE at 6 kts
Sea-level pressure: 30.10 ins. Hg, falling, then more slowly
Visibility: 60 miles 
6-hr Max temp: 66F 
6-hr Min temp: 56F
BHO SA 1755 E140 BKN 60 193/63/36/E0606/010/ FEW CU SE-N 
WND LGT AND VRBL/ 8/180 56007 10066 20056

SUMMARY FOR WEDNESDAY, MAY 18, 2016 
  
TEMPERATURE (DEGREES F)
MAX.....64   NORMAL.....67
MIN.....48   NORMAL.....49 
MEAN....56   NORMAL.....58

DEPARTURE FROM 30-YEAR NORMAL..........................-2
TOTAL DEPARTURE FOR THE MONTH.........................-41 [-2.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............9   DEPARTURE..........+1
TOTAL HEATING UNITS FOR THE MONTH.............217   DEPARTURE.........+32
TOTAL HEATING UNITS FOR THE SEASON...........5209   DEPARTURE.......-1011
TOTAL HEATING UNITS LAST SEASON TO DATE......6357   DIFFERENCE......-1148   

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................24  NE AT 3:44 A.M.      
                   ASOS........................25  N  AT 1:39 A.M.   
                   DAVIS.......................22 NNE AT 3:39 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY.....................16  NE AT 3:45 A.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE..................17  NE AT 3:47 A.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE.................16 NNE AT 3:46 A.M.   
AVERAGE WIND SPEED AND DIRECTION...............8.9 ENE
                   ASOS........................9.1
                   DAVIS.......................7.9 ENE [060 Deg.]
 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.13
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.88  DEPARTURE......-0.33
                         ASOS..............1.76
TOTAL PRECIPITATION FOR THE YEAR..........18.82  DEPARTURE......-1.94 
                         ASOS.............18.76

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)  
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........0.0
TOTAL SNOWFALL FOR THE MONTH..............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/-5/0.13/0.0/348/42             28 ENE AERO 29 N   RMY 26
5/7 51/43/47/-8/.../0.0/000/00              25 NE  AERO 25 NE  RMY 23
5/8 60/46/53/-2/.../0.0/276/33              47 W   AERO 53 W   RMY 49         
5/9 65/43/54/-1/0.00/0.0/720/86             40 W   AERO 44 W   RMY 40
5/10 69/40/55/0/0.00/0.0/774/93             22 W   AERO 25 WNW RMY 22
5/11 76/50/63/0.00/0.0/780/93               22 WNW AERO 23 WNW*RMY 22
5/12 75/54/65/0.00/0.0/792/94               23 NNE AERO 25 S   RMY 23
5/13 74/52/63/+7/0.21/0.0/078/09            27 S   AERO 27 S   RMY 26  
5/14 78/54/66/+9/0.00/0.0/.../..            35 SSW*AERO 40 SSW RMY 37
5/15 60/40/51/-6/0.00/0.0/.../..            50 W   AERO 54 W   RMY 49
5/16 58/38/48/-9/0.00/0.0/.../..            45 W*  AERO 51 WNW RMY 49
5/17 69/47/58/+1/0.00/0.0/.../..            32 W   AERO 38 W   RMY 38
5/18 64/48/56/-2/0.00/0.0/.../..            24 NE  AERO 26 NNW RMY N/A

5/19 low temp since midnight is 50F; normal low now 49F

*last of several occurences
     
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 19
HIGH 91F IN 1962
LOW 34F IN 2002
PRECIP 1.54 INCHES IN 1900
PEAK GUST 58 MPH NW IN 1964

RECORDS FOR MAY 20
HIGH 91F IN 1975,1996
LOW 37F IN 1948, 2002
PRECIP 1.65 INCHES IN 1969
PEAK GUST 57 MPH S IN 1963, WNW IN 1982

TODAY'S REPORT PREPARED BY: Cece Borries-Strigle