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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, MAY 16, 2016 
ALL TIMES ARE IN EASTERN STANDARD TIME

COOL TEMPS, WINDS GUST TO 45MPH BY AFTERNOON

Broken stratocumulus present throughout the morning and early
afternoon helped prevent temperatures from rising above
the mid-50s.  A morning low of 38F and a maximum of 54F by the
1:00PM EST observation makes the day's average temperature 46F,
11F below normal.

Winds were gusty today peaking at 45 MPH (39 kts) from the west
at 1:27PM EST.


Today's Observations:

7 A.M.
Weather: Broken stratocumulus, scattered cirrus 
Temperature: 43F; Dew Point: 26F; Wind: W at 15G26 kts
Peak Wind: 27 kts W at 6:34 A.M. EST
Sea-level pressure: 29.89 ins. Hg, rising then rising more slowly 
Visibility: 70 miles
6-hr Max temp: 43F 
6-hr Min temp: 38F
24-hr precip: 0.00 in.
BHO SA 1155 E44 BKN 250 SCT 70 121/43/26/2615G26/989/ 
PK WND 2627/34/ 8/501 51015 10043 20038

10 A.M.
Weather:  Broken Stratocumulus 
Temperature: 50F; Dew Point: 25F; Wind: WNW AT 29G36 kts
Peak Wind: 36 kts W at 9:55 A.m. EST
Sea-level pressure: 29.87 ins. Hg, rising, then falling 
Visibility: 70 miles
BHO SA 1455 E54 BKN 70 114/50/25/3029G36/987/ PK WND 2836/55/ 
8/500 58007

1 P.M.
Weather: Few cirrus WNW, broken stratocumulus
Temperature: 54F; Dew Point: 26F; Wind: W at 26G38 kts
Peak Wind: 38 kts W at 12:47 P.M. EST
Sea-level pressure: 29.87 ins. Hg, rising, then falling
Visibility: 65 miles 
6-hr Max temp: 54F 
6-hr Min temp: 43F
BHO SA 1455 E54 BKN 65 115/54/26/2726G38/987/ FEW CI WNW 
PK WND 2738/47/ 8/501 50001 10054 20043

SUMMARY FOR SUNDAY, MAY 15, 2016 
  
TEMPERATURE (DEGREES F)
MAX.....60   NORMAL.....66
MIN.....41   NORMAL.....48 
MEAN....51   NORMAL.....57

DEPARTURE FROM 30-YEAR NORMAL..........................-6
TOTAL DEPARTURE FOR THE MONTH.........................-31 [-2.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............14   DEPARTURE..........+5
TOTAL HEATING UNITS FOR THE MONTH.............184   DEPARTURE.........+24
TOTAL HEATING UNITS FOR THE SEASON...........5176   DEPARTURE.......-1019
TOTAL HEATING UNITS LAST SEASON TO DATE......6343   DIFFERENCE......-1137   

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................50  W    AT  7:46 P.M.      
                   ASOS........................49 WNW   AT  7:45 P.M.   
                   DAVIS.......................47  W    AT  7:42 P.M. RMY 49
FASTEST MILE FOR YESTERDAY.....................37  W    AT  7:40 P.M.    
MAXIMUM 2-MINUTE ASOS AVERAGE..................35  W    AT  7:46 P.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE.................31 WNW   AT  7:46 P.M.   
AVERAGE WIND SPEED AND DIRECTION...............21.1 W
                   ASOS........................21.0
                   DAVIS.......................18.1 W [280 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..........1.88  DEPARTURE......+0.05
                         ASOS..............1.76
TOTAL PRECIPITATION FOR THE YEAR..........18.82  DEPARTURE......-1.56 
                         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/.../..             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 76/50/63/0.00/0.0/.../..               22 WNW AERO 23 WNW*RMY 22
5/12 75/54/65/0.00/0.0/.../..               23 NNE AERO 25 S   RMY 23
5/13 74/52/63/+7/0.21/0.0/.../..            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 low temp since midnight is 38F; normal low now 48F

* Last of several occurrences
     
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 16
HIGH 90F IN 1951
LOW 30F IN 1936
PRECIP 2.63 INCHES IN 1954
PEAK GUST 56e MPH NW IN 1952

RECORDS FOR MAY 17
HIGH 88F IN 1974, 1977
LOW 34F IN 1956, 1957
PRECIP 2.07 INS IN 1916
PEAK GUST 52 MPH SW IN 1967, W IN 1974

TODAY'S REPORT PREPARED BY: Cece Borries-Strigle