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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, MAY 30, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

BELOW NORMAL TEMPERATURES AND OVERCAST SKIES CONTINUE

Light rain began yesterday afternoon and continued into 
early yesterday evening.  Precip. measured 0.07 inches
at 7:00AM EST.  May 2017's monthly departure now sits
0.72 in. above normal, and the annual departure is just
shy of 3.00 inches above normal.

Today has been warmer than yesterday, but temps. still
remain below normal values.  The max. by 1:00PM EST was
61F, and the normal max. for today is 70F.  Temps. dropped
to an overnight low of 46F this morning, 6F below normal.
Winds also continue to be very light.  Wind speeds varied
from 2-7 MPH during the observations out of the east through
south.


Today's Observations:

7 A.M.
Weather: Overcast stratus
Temperature: 49F; Dew Point: 48F; Wind: estimated E at 2 kts,
Wind: Light and variable
Sea-level pressure: 30.22 ins. Hg, rising unsteadily
Visibility: 8 miles, distant fog in all directions
6-hr Max temp: 49F
6-hr Min temp: 46F
24-hr precip: 0.07 in.
BHO SA 1155 E3 OVC 8 234/49/48/E1002/022/ DSNT FG ALQDS WND L/V/
8/6// 52014 MANUAL 70007 ASOS 70007 10049 20046

10 A.M.
Weather: Broken stratocumulus, overcast stratus
Temperature: 55F; Dew Point: 50F; Wind: estimated SE at 3 kts,
Wind: Light and variable
Sea-level pressure: 30.22 ins. Hg, falling then rising
Visibility: 40 miles, except 20 miles WSW-NE, distant fog WSW-NE
BHO SA 1455 E4 BKN 23 OVC 40 232/55/50/E1403/022/ VSBY WSW-NE 20
DSNT FG WSW-NE WND L/V/ 8/6// 56002

1 P.M. 
Weather: Broken stratocumulus, overcast stratus
Temperature: 61F; Dew Point: 53F; Wind: S at 6 kts,
Wind speed: Light
Sea-level pressure: 30.19 ins. Hg, falling then rising
Visibility: 60 miles, except 40 miles W-NNE, distant fog W-NNE
6-hr Max temp: 61F
6-hr Min temp: 49F
BHO SA 1755 E7 BKN 22 OVC 60 225/61/53/1706/019/ VSBY W-NNE 40 
DSNT FG W-NNE WND LGT/ 8/6// 56007 10061 20049


SUMMARY FOR MONDAY, MAY 29, 2017
 
TEMPERATURE (DEGREES F)
MAX.....51   NORMAL.....70
MIN.....46   NORMAL.....52
MEAN....49   NORMAL.....61

DEPARTURE FROM 30-YEAR NORMAL........................-12
TOTAL DEPARTURE FOR THE MONTH........................-42 [-1.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............16   DEPARTURE.........+10
TOTAL HEATING UNITS FOR THE MONTH.............314   DEPARTURE.........+56
TOTAL HEATING UNITS FOR THE SEASON...........5647   DEPARTURE........-645
TOTAL HEATING UNITS LAST SEASON TO DATE......5245   DIFFERENCE.......+402

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................21  E  AT 9:38 A.M.
                   AERO........................20 ENE AT 2:15 P.M.*
                   ASOS........................21 ENE AT 2:17 P.M.
                   DAVIS.......................18  NE AT 1:56 P.M. RMY 20
FASTEST MILE FOR YESTERDAY.....................14  E  AT 9:45 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................15 ENE AT 2:03 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................14 ENE AT 9:47 A.M.
AVERAGE WIND SPEED AND DIRECTION..............8.9  E
                   ASOS.......................9.3
                   DAVIS......................7.4 ENE [070 deg.]
*last of multiple occurrances

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.07  DEPARTURE......-0.07
                         ASOS..............0.07
TOTAL PRECIPITATION FOR THE MONTH..........4.52  DEPARTURE......+0.72
                         ASOS..............4.66
TOTAL PRECIPITATION FOR THE YEAR..........25.33  DEPARTURE......+2.98
                         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/034/04                  21 N   AERO 18 N   RMY 22
5/2  65/42/54/+1/0.26/136/16               41 W   AERO 44 W   RMY 43               
5/3  52/42/53/0/0.00/595/70                37 WNW*AERO 39 WNW RMY 40
5/4  65/40/53/-1/0.00/724/85               23 S   AERO 23 S   RMY 24
5/5  51/44/48/-6/0.73/000/00               28 E   AERO 28 E   RMY N/A
5/6  65/50/58/+4/0.23/094/11               46 SSE AERO 48 SSE RMY 49
5/7  63/47/55/0/T/670/78                   35 S   AERO 38 S   RMY 39
5/8  54/38/46/-9/T/224/26                  29 WSW AERO 29 WSW RMY 32
5/9  53/36/45/-10/T/251/29                 20 ESE AERO 17 ESE RMY 19
5/10 57/42/50/-5/0.00/225/26               17 NNE AERO 16 NW  RMY N/A
5/11 58/45/52/-4/0.00/443/51               23 NE* AERO 23 NE  RMY 23 
5/12 57/41/49/-7/0.01/453/52               21 NE  AERO 20 NE  RMY 19
5/13 57/41/49/-7/0.19/009/01               24 ENE AERO 24 E   RMY N/A
5/14 47/43/45/-12/1.49/000/00              33 NNE AERO 36 N   RMY 36
5/15 58/43/51/-6/0.24/018/02               36 NNW AERO 40 NNW RMY 41
5/16 79/51/65/+8/0.00/870/99               26 WNW AREO 26 WNW RMY 29
5/17 90/60/75/+18/T/775/88                 32 SSE AERO 33 SW* RMY 34
5/18 96/69/83/+25/0.01/830/94              39 WNW AERO 41 WNW RMY 42 TSTM
5/19 89/56/73/+15/T/814/92                 35 W   AERO 33 W   RMY 37
5/20 67/49/58/0/0.00/709/80                23 NE  AERO 22 NE  RMY 21
5/21 66/45/56/-3/0.00/773/87               21 E   AERO 20 S   RMY 21
5/22 53/48/51/-8/..../000/00               22 S   AERO 22 S   RMY 23
5/23 70/51/61/+2/..../366/41               21 NNW AERO 18 NNW RMY 19
5/24 65/53/59/0/0.00/116/13                17 E   AERO 16 E   RMY N/A
5/25 52/49/51/-9/..../000/00               36 E   AERO 38 E   RMY N/A TSTM
5/26 56/46/51/-9/..../.../..               35 N   AERO 37 N   RMY N/A
5/27 67/51/59/6/0.00/.../..                18 SE  AERO 18 SE  RMY 19
5/28 71/51/61/0/T/.../..                   18 SSW*AERO 18 SSW RMY 18
5/29 51/46/49/-12/..../.../..              21 E   AERO 20 ENE*RMY 20

5/30 Low temp since midnight is 46F; normal low is now 52F


DAILY RECORDS FOR MAY

5/17/17: DAILY RECORD MAXIMUM TEMPERATURE OF 90F,
         BREAKS PREVIOUS RECORD OF 88F SET IN 1974
         AND TIED IN 1977

5/17/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 60F,
         TIES PREVIOUS RECORD SET IN 1932

5/18/17: DAILY RECORD MAXIMUM TEMPERATURE OF 96F,
         BREAKS PREVIOUS RECORD OF 88F SET IN 1906
         AND TIED IN 1936 AND 1986;
         BREAKS PREVIOUS MONTHLY RECORD OF 94F SET ON
         MAY 26, 2010

5/18/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 69F,
         BREAKS PREVIOUS RECORD OF 61F SET IN 1943


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

RECORDS FOR MAY 30
HIGH 93F IN 1929
LOW 39F IN 1949,1961
PRECIP 1.47 INS 1948
PEAK GUST 61e MPH NW IN 1945

RECORDS FOR MAY 31
HIGH 92F IN 1944,1987,2013
LOW 35F IN 1961
PRECIP 5.02 INS 1984 (RECORD FOR MAY)
PEAK GUST 54e MPH WNW IN 1945

TODAY'S REPORT PREPARED BY: Cecilia Borries-Strigle