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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, MAY 10, 2016 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
HIGH PRESSURE, DRY CONDITIONS, AND WARM TEMPS CONTINUE

Temperatures increased throughout the day reaching a max.
of 67F by 1:00PM, 2F above average.  The overnight low was 40F,
6F below average.

Scattered cirrus clouds at 7:00AM moved in and turned into 
broken cirrostratus by the afternoon.  Visibility remained high 
at 80 miles all day.


Today's Observations:

7 A.M.
Weather: Scattered cirrus
Temperature: 50F; Dew Point: 28F; Wind: WNW at 10 kts
Sea-level pressure: 30.19 ins. Hg, rising, then less quickly
Visibility: 80 miles
6-hr Max temp: 50F 
6-hr Min temp: 41F
24-hr precip: 0.00 in.
BHO SA 1155 250 SCT 80 223/50/28/3010/019/ 8/001 51010 10050 20041

10 A.M.
Weather: Scattered cirrostratus, few cirrus SW-ESE
Temperature: 60F; Dew Point: 31F; Wind: NW at 10G16 kts
Sea-level pressure: 30.20 ins. Hg, rising, then falling
Visibility: 80 miles
BHO SA 1455 250 SCT 80 226/60/31/3110G16/020/ FEW CI SW-ESE/ 
8/005 50003

1 P.M.
Weather: Broken cirrostratus
Temperature: 66F; Dew Point: 36F; Wind: W at 8 kts
Sea-level pressure: 30.18 ins. Hg, falling, then more quickly
Visibility: 80 miles
6-hr Max temp: 67F 
6-hr Min temp: 49F
BHO SA 1755 E250 BKN 80 220/66/36/2708/018/ 8/008 58016 10067 20049

SUMMARY FOR MONDAY, MAY 9, 2016 
  
TEMPERATURE (DEGREES F)
MAX.....65   NORMAL.....64
MIN.....43   NORMAL.....46 
MEAN....54   NORMAL.....55

DEPARTURE FROM 30-YEAR NORMAL..........................-1
TOTAL DEPARTURE FOR THE MONTH.........................-57 [-6.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............11   DEPARTURE..........+1
TOTAL HEATING UNITS FOR THE MONTH.............156   DEPARTURE.........+53
TOTAL HEATING UNITS FOR THE SEASON...........5148   DEPARTURE........-990
TOTAL HEATING UNITS LAST SEASON TO DATE......6324   DIFFERENCE......-1176   

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................40 W   AT  1:16 P.M.     
                   ASOS........................41 W   AT  1:15 P.M.  
                   DAVIS.......................37 WSW AT 12:08 P.M.  RMY 40
FASTEST MILE FOR YESTERDAY.....................30 W   AT  1:15 P.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE..................32 W   AT  1:15 P.M.   
MAXIMUM 2-MINUTE DAVIS AVERAGE.................28 W   AT  1:16 P.M.  
AVERAGE WIND SPEED AND DIRECTION...............16.6 W 
                   ASOS........................15.0
                   DAVIS.......................13.6 W [280 Deg.]
 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.11
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.60  DEPARTURE......+0.51
                         ASOS..............1.59
TOTAL PRECIPITATION FOR THE YEAR..........18.54  DEPARTURE......-1.10 
                         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 low temp since midnight is 40F; 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 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

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

TODAY'S REPORT PREPARED BY: Cece Borries-Strigle