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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, MAY 31, 2016 
ALL TIMES ARE IN EASTERN STANDARD TIME

HUMIDITY DECREASES, TEMPERATURE INCREASES AS HIGH PRESSURE BUILDS

Building high pressure brought dry conditions to the area today.
The morning was muggy with a temperature of 71F, a relative 
humidity of 86%, and mostly cloudy skies.  Temperatures increased
to a max. of 83F by 1:00PM EST, while humidity dropped throughout
the day and skies cleared.  Visibility remained at 40 miles with
distant haze present all day.

No additional precipitation was measured past yesterday's 1:00PM
observation making the twenty-four hour precipitation at 7:00AM 
this morning 0.07 inches.

Today's Observations:

7 A.M. 
Weather: Few altostratus SE-SSW, broken cirrus
Temperature: 71F; Dew Point: 66F; Wind: WSW at 7 kts
Sea-level pressure: 29.94 ins. Hg, steady, then rising
Visibility: 40 miles, distant haze
6-hr Max temp: 71F 
6-hr Min temp: 67F
24-hr precip: 0.07 in.
BHO SA 1155 E250 BKN 40 138/71/66/2407/994/ FEW AS SE-SSW DSNT HZ/ 
8/012 53012 ASOS 70011 MANUAL 70007 10071 20067

10 A.M.
Weather: Few cumulus NE-SW, broken cirrus
Temperature: 78F; Dew Point: 56F; Wind: WNW at 10 kts
Sea-level pressure: 29.93 ins. Hg, falling, then more quickly 
Visibility: 40 miles, distant haze
BHO SA 1455 E250 BKN 40 134/78/56/2910/993/ FEW CU NE-SW DSNT HZ/ 
8/102 58004

1 P.M.
Weather: Few cumulus E-SSW, scattered cirrus
Temperature: 82F; Dew Point: 47F; Wind: W at 14G22 kts
Sea-level pressure: 29.89 ins. Hg, falling, then more slowly 
Visibility: 40 miles, distant haze
6-hr Max temp: 83F
6-hr Min temp: 69F
BHO SA 1755 250 SCT 40 122/82/47/2614G22/989/ FEW CU E-SSW DSNT HZ/ 
8/102 56012 10083 20069

SUMMARY FOR MONDAY, MAY 30, 2016 
  
TEMPERATURE (DEGREES F)
MAX.....71   NORMAL.....70
MIN.....52   NORMAL.....52 
MEAN....62   NORMAL.....61

DEPARTURE FROM 30-YEAR NORMAL..........................+1
TOTAL DEPARTURE FOR THE MONTH.........................+18 [+0.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............3   DEPARTURE..........-2
TOTAL HEATING UNITS FOR THE MONTH.............256   DEPARTURE..........-7
TOTAL HEATING UNITS FOR THE SEASON...........5248   DEPARTURE.......-1050
TOTAL HEATING UNITS LAST SEASON TO DATE......6401   DIFFERENCE......-1153   

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................25 SSW  AT  6:36 P.M.   
                   ASOS........................27 SSW  AT  6:24 P.M.  
                   DAVIS.......................26 SSW  AT  6:33 P.M. RMY 27
FASTEST MILE FOR YESTERDAY.....................19 SSW  AT  6:35 P.M.      
MAXIMUM 2-MINUTE ASOS AVERAGE..................20 SW   AT  6:38 P.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE.................19 SSW  AT  6:35 P.M. 
AVERAGE WIND SPEED AND DIRECTION.............7.9 SSW
                   ASOS......................8.9
                   DAVIS.....................7.4 SSW [200 Deg.]
* Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.07  DEPARTURE......-0.09
                         ASOS..............0.11
TOTAL PRECIPITATION FOR THE MONTH..........3.20  DEPARTURE......-0.76
                         ASOS..............3.02
TOTAL PRECIPITATION FOR THE YEAR..........20.14  DEPARTURE......-2.37
                         ASOS.............20.44

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 74/51/63/+4/T/0.0/.../..               22 ENE AERO 31 ENE RMY N/A            
5/24 56/50/53/-6/.../0.0/.../..             30 ENE AERO 31 ENE RMY 29
5/25 86/51/69/+9/.../0.0/.../..             25 W   AERO 28 W   RMY 25
5/26 86/64/75/+15/0.00/0.0/.../..           21 SE  AERO 23 SE  RMY 21
5/27 81/60/71/+11/0.00/0.0/.../..           26 S   AERO 30 S   RMY 29
5/28 92/63/78/+17/0.00/0.0/.../..           22 SSW AERO 22 SSW RMY N/A 
5/29 72/51/62/+1/.../0.0/.../..             18 NE  AERO 20 NE  RMY 18
5/30 71/52/62/+1/.../0.0/.../..             25 SSW AERO 28 SSW RMY 27

5/31 low temp since midnight is 67F; normal low now 52F

* 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

5/28/16: DAILY RECORD MAXIMUM TEMP. OF 92F, 
         PREVIOUS RECORD OF 90F SET IN 1914   


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

RECORDS FOR MAY 31
HIGH 92F IN 1944,1987
LOW 35F IN 1961
PRECIP 5.02 INS 1984 (RECORD FOR MAY)
PEAK GUST 54e MPH WNW IN 1945

RECORDS FOR JUNE 1
HIGH 90F IN 1937,2013
LOW 36F IN 1945 [Record for month]
PRECIP 2.28 INS IN 1992
PEAK GUST 51e MPH SE IN 1952

TODAY'S REPORT PREPARED BY: Cece Borries-Strigle