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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, MAY 23, 2016 
ALL TIMES ARE IN EASTERN STANDARD TIME

BEAUTIFUL SUNNY, MILD AND DRY WEATHER TODAY
WINDS TURN TO A SEA-BREEZE BUT TEMPS. STILL RISE TO 70'S
DEW POINTS FALL TO 40'S 

A sunny sky with just a few cumulus clouds and some 
high cirrus to decorate today's sky. Temperatures were 
very pleasant rising from a low of 51F this morning to 
the low 70's by noontime along with very dry air as the 
dew point drops to 40's and relative humidity falls into 
30% range.  

Today's Observations:

7 A.M. 
Weather: Few cirrostratus ESE-SW, scattered cirrus  
Temperature: 59F; Dew Point: 47F; Wind: estimated NW at 5 kts,
Wind: Light and variable
Sea-level pressure: 29.93 ins. Hg, rising slightly  
Visibility: 40 miles, except 50 miles ENE-SE, distant haze
6-hr Max temp: 59F 
6-hr Min temp: 51F
24-hr precip: Trace
BHO SA 1155 250 SCT 40 135/59/47/E3205/993/ FEW CS ESE-SW 
VSBY ENE-SE 50 WND LGT/ 8/001 53005 10059 20051 

10 A.M.
Weather: Scattered cirrus, few cumulus fractus/cumulus
forming SW-N, lower dense cirrus layer distant ESE-SSW  
Temperature: 70F; Dew Point: 48F; Wind: estimated N at 6 kts,
Wind: Light and variable  
Sea-level pressure: 29.94 ins. Hg, rising then falling
slightly but higher than 3 hours ago   
Visibility: 50 miles, distant haze 
BHO SA 1455 250 SCT 50 137/70/48/E3606/994/ FEW SML CUFRA/CU 
FRMG SW-N LWR DNS CI LYR XTDNG DSNT ESE-SSW DSNT HZ WND L/V/ 
8/101 50002  

1 P.M.
Weather: Few cumulus S-NNW, few cirrostratus NNW-S, scattered cirrus
Temperature: 73F; Dew Point: 46F; Wind: ENE at 13G18 kts
Sea-level pressure: 29.91 ins. Hg, falling, then more slowly
Visibility: 40 miles, distant haze
6-hr Max temp: 74F
6-hr Min temp: 59F
BHO SA 1755 250 SCT 40 130/73/46/0713G18/991/ FEW CU S-NNW FEW 
CS NNW-S DSNT HZ/ 8/101 56007 10074 20059


SUMMARY FOR SUNDAY, MAY 22, 2016 
  
TEMPERATURE (DEGREES F)
MAX.....64   NORMAL.....68
MIN.....53   NORMAL.....50 
MEAN....59   NORMAL.....59

DEPARTURE FROM 30-YEAR NORMAL...........................0
TOTAL DEPARTURE FOR THE MONTH.........................-34 [-1.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............6   DEPARTURE..........-1
TOTAL HEATING UNITS FOR THE MONTH.............236   DEPARTURE.........+21
TOTAL HEATING UNITS FOR THE SEASON...........5228   DEPARTURE.......-1022
TOTAL HEATING UNITS LAST SEASON TO DATE......6388   DIFFERENCE......-1160   

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................26 ENE AT 12:59 P.M.        
                   ASOS........................29 ENE AT  1:00 P.M.    
                   DAVIS.......................25 ENE AT  1:00 P.M. RMY 26
FASTEST MILE FOR YESTERDAY.....................18 ENE AT  1:22 P.M.                      
MAXIMUM 2-MINUTE ASOS AVERAGE..................17 ENE AT  1:37 P.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE.................16 NE  AT  1:04 P.M.      
AVERAGE WIND SPEED AND DIRECTION..............7.6 NE
                   ASOS.......................8.2  
                   DAVIS......................6.9 NE [040 Deg.]
* Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...TRACE  DEPARTURE......-0.14
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........2.14  DEPARTURE......-0.61
                         ASOS..............2.02
TOTAL PRECIPITATION FOR THE YEAR..........19.08  DEPARTURE......-2.22 
                         ASOS.............19.02

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/-5/0.13/0.0/360/42             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/.../0.0/284/33              47 W   AERO 53 W   RMY 49         
5/9 65/43/54/-1/0.00/0.0/743/86             40 W   AERO 44 W   RMY 40
5/10 69/40/55/0/0.00/0.0/806/93             22 W   AERO 25 WNW RMY 22
5/11 76/50/63/+7/0.00/0.0/808/93            22 WNW AERO 23 WNW*RMY 22
5/12 75/54/65/+9/0.00/0.0/819/94            23 NNE AERO 25 S   RMY 23
5/13 74/52/63/+7/0.21/0.0/079/09            27 S   AERO 27 S   RMY 26  
5/14 78/54/66/+9/0.00/0.0/656/75            35 SSW*AERO 40 SSW RMY 37
5/15 60/41/51/-6/0.00/0.0/588/67            50 W   AERO 54 W   RMY 49
5/16 58/38/48/-9/0.00/0.0/800/91            45 W*  AERO 51 WNW RMY 49
5/17 69/47/58/+1/0.00/0.0/344/39            32 W   AERO 38 W   RMY 38
5/18 64/48/56/-2/0.00/0.0/804/91            24 NE  AERO 26 NNW RMY N/A
5/19 66/49/58/0/0.26/0.0/.../..             23 WNW AERO 26 WNW RMY 25 
5/20 73/46/60/+2/0.00/0.0/.../..            20 SSE AERO 22 SSE RMY 21
5/21 74/53/64/+5/0.00/0.0/.../..            21 S   AERO 23 S   RMY 21    
5/22 64/53/59/0/T/0.0/.../..                26 ENE AERO 29 ENE RMY 26 

5/23 low temp since midnight is 51F; normal low now 50F

* Last of several occurrences
* All sunshine data corrected to astronomical minutes. 
     
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 23
HIGH 92F IN 1964,1992
LOW 38F IN 1976
PRECIP 0.97 INS IN 1979
PEAK GUST 49e MPH W IN 1945

RECORDS FOR MAY 24
HIGH 92F IN 1964
LOW 35F IN 1956
PRECIP 2.13 INS IN 1951
PEAK GUST 54 MPH NNE IN 2005

TODAY'S REPORT PREPARED BY: Robert Skilling/Cece Borries-Strigle