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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, MAY 8, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

COOL DAY WITH EARLY MORNING RAIN SHOWER

Light drizzle turned to light rain around 6:00AM EST
this morning and lasted for about an hour.  Distant
showers were observed throughout the day, but no other
precip. fell at BHO by 1:00PM.  Temperatures have
remained cooler than average.  A low of 39F occurred
early this morning, and the max. by 1:00PM was only 54F.
The average temperature for today is 55F.  Conditions
were favorable for very clear visibility today, remaining
at 80 miles during each observation.


Today's Observations:

7 A.M.
Weather: Few cumulus in all directions, broken stratocumulus
Temperature: 44F; Dew Point: 35F; Wind: W at 13G20 kts
Sea-level pressure: 29.76 ins. Hg, rising unsteadily
Visibility: 80 miles
6-hr Max temp: 45F
6-hr Min temp: 39F
24-hr precip: Trace
BHO SA 1155 E54 BKN 80 077/44/35/2613G20/976/ FEW CU ALQDS/
8/500 52025 10045 20039

10 A.M.
Weather: Broken stratocumulus, distant showers WNW
Temperature: 50F; Dew Point: 30F; Wind: WSW at 14G23 kts
Sea-level pressure: 29.78 ins. Hg, steady then rising
Visibility: 80 miles
BHO SA 1455 E40 BKN 80 083/50/30/2514G23/978/ DSNT SHWRS 
WNW 8/500 53006

1 P.M.
Weather: Broken stratocumulus, distant showers WSW
Temperature: 50F; Dew Point: 31F; Wind: WSW at 11G20 kts
Sea-level pressure: 29.78 ins. Hg, falling then rising
Visibility: 80 miles
6-hr Max temp: 54F
6-hr Min temp: 43F
BHO SA 1755 E49 BKN 80 084/50/31/2411G20/978/
VSBY WSW 40 DSNT SHWRS WSW/ 8/500 53001 10054 20043


SUMMARY FOR SUNDAY, MAY 7, 2017
 
TEMPERATURE (DEGREES F)
MAX.....63   NORMAL.....64
MIN.....47   NORMAL.....45
MEAN....55   NORMAL.....55

DEPARTURE FROM 30-YEAR NORMAL..........................0
TOTAL DEPARTURE FOR THE MONTH.........................-8 [-1.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............10   DEPARTURE..........-1
TOTAL HEATING UNITS FOR THE MONTH..............87   DEPARTURE..........+5
TOTAL HEATING UNITS FOR THE SEASON...........5420   DEPARTURE........-697
TOTAL HEATING UNITS LAST SEASON TO DATE......5125   DIFFERENCE.......+295

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................35 S  AT 3:31 P.M.
                   AERO........................38 S  AT 3:30 P.M.
                   ASOS........................38 S  AT 3:54 P.M.
                   DAVIS.......................37 SW AT 3:28 P.M. RMY 39
FASTEST MILE FOR YESTERDAY.....................28 S  AT 3:31 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................29 S  AT 3:32 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................27 SW AT 3:17 P.M.
AVERAGE WIND SPEED AND DIRECTION.............17.0 S
                   ASOS......................17.1
                   DAVIS.....................14.2 SSW [210 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...TRACE  DEPARTURE......-0.13
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.22  DEPARTURE......+0.35
                         ASOS..............1.27
TOTAL PRECIPITATION FOR THE YEAR..........22.03  DEPARTURE......+2.61
                         ASOS...............N/A ***
*** ASOS annual total not available due to erroneous readings


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
M:    Missing data

5/1  50/43/47/-6/T/.../..                  21 N   AERO 18 N   RMY 22
5/2  65/42/54/+1/0.26/.../..               41 W   AERO 44 W   RMY 43               
5/3  52/42/53/0/0.00/.../..                37 WNW*AERO 39 WNW RMY 40
5/4  65/40/53/-1/..../.../..               23 S   AERO 23 S   RMY 24
5/5  51/44/48/-6/..../.../..               28 E   AERO 28 E   RMY N/A
5/6  65/50/58/+4/..../.../..               46 SSE AERO 48 SSE RMY 49
5/7  63/47/55/0/..../.../..                35 S   AERO 38 S   RMY 39

5/8  Low temp since midnight is 39F; normal low is now 45F

DAILY RECORDS FOR MAY

None so far.

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

RECORDS FOR MAY 8
HIGH 89F IN 2000
LOW 29F IN 1956
PRECIP 1.48 INCHES IN 1886
SNOWFALL TRACE IN 1898, 1947
PEAK GUST 68e MPH NNW IN 1943

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

TODAY'S REPORT PREPARED BY: Cecilia Borries-Strigle, Nicholas Rousseau