BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, MAY 14, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME
 
SUNNY, SEASONABLE AND VERY DRY WITH LIGHT WINDS
 
A beautiful clear, sunny and seasonable mid-May day today
with temperatures rising from 44F to near 70F early this
afternoon.  The air is very dry with dew points dropping
to the low 20's and relative humidity in the high teens
by early this afternoon.
  
Today's Observations:
 
7 A.M.
Weather: CLR [SKC] 
Temperature: 52F; Dew Point: 33F; Wind: NNW at 8 kts
Sea-level pressure: 30.35 ins. Hg, rising then more rapidly
Visibility: 60 miles, distant haze
6-hr Max temp: 52F
6-hr Min temp: 44F
24-hr precip: none
BHO SA 1155 CLR 60 277/52/33/3408/035/ SKC LGT DSNT HZ/
53021 10052 20044
 
10 A.M.
Weather: Clear, few small cumulus forming SSE-S  
Temperature: 61F; Dew Point: 29F; Wind: estimated WSW at 3 kts
Wind Speed: Light
Sea-level pressure: 30.35 ins. Hg, about steady 
Visibility: 60 miles, distant haze
BHO SA 1455 CLR 60 278/61/29/E2503/035/ FEW SML CU FRMG
SSE-S WND L/V/ 8/100 50001
 
1 P.M.
Weather: Clear, few small cumulus SSE-S 
Temperature: 67F; Dew Point: 24F; Wind: estimated from WNW at 3 kts,
Wind: Light and variable 
Sea-level pressure: 30.32 ins. Hg, falling, then more quickly  
Visibility:  60 miles
6-Hr Max temp: 69F
6-Hr Min temp: 52F
BHO SA 1755 CLR 60 267/67/24/E2903/032/ FEW SML CU DSNT SSE-S
WND L/V/ 8/100 58011 10069 20052
 
 
SUMMARY FOR WEDNESDAY, MAY 13, 2015
  
TEMPERATURE (DEGREES F)
MAX.....67   NORMAL.....66
MIN.....47   NORMAL.....47
MEAN....57   NORMAL.....56
 
DEPARTURE FROM 30-YEAR NORMAL.......................+1
TOTAL DEPARTURE FOR THE MONTH......................+91 [+6.8 DEGREES/DAY]
 
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............8  DEPARTURE...........-1
TOTAL HEATING UNITS FOR THE MONTH..............61  DEPARTURE..........-81   
TOTAL HEATING UNITS FOR THE SEASON...........6332  DEPARTURE.........+155
TOTAL HEATING UNITS LAST SEASON TO DATE......6272  DIFFERENCE.........+60
 
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............0   DEPARTURE...........0
TOTAL COOLING UNITS FOR THE MONTH.............16   DEPARTURE.........+12
TOTAL COOLING UNITS FOR THE SEASON............16   DEPARTURE.........+10
TOTAL COOLING UNITS LAST SEASON TO DATE........9   DIFFERENCE.........+7
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..................31 WNW   AT   1:33 A.M.       
                   ASOS.......................36 WNW   AT   1:33 A.M.          
                   DAVIS......................35 WNW   AT   1:33 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY....................26 WNW   AT  11:48 A.M.
WNWIMUM 2-MINUTE ASOS AVERAGE.................25 NW    AT  12:06 P.M.          
MAXIMUM 2-MINUTE DAVIS AVERAGE................24 WNW   AT  11:48 A.M.    
AVERAGE WIND SPEED AND DIRECTION.............15.0 WNW         
                   ASOS......................14.0     
                   DAVIS.....................12.8 NW [310 deg.]  
* Last of several occurrences...

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...........0.27  DEPARTURE.....-1.32 
                         ASOS...............0.26
TOTAL PRECIPITATION FOR THE YEAR...........18.19  DEPARTURE.....-1.82
                         ASOS................N/A ***
*** ASOS annual totals not available due to erroneous readings
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M...........0.0  DEPARTURE......0.0
TOTAL SNOWFALL FOR THE MONTH.................0.0  DEPARTURE......0.0 
TOTAL SNOWFALL FOR THE SEASON..............150.8  DEPARTURE....+88.1
 
PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY 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  52/37/45/-8/0.00/0.0/354/42               21 NE  RMY 20
5/2  63/35/49/-4/0.00/0.0/668/79               20 S   RMY 20 
5/3  74/44/59/+6/0.00/0.0/509/60               22 S   RMY 22
5/4  83/47/65/+11/0.00/0.0/783/92              39 SSW RMY 45
5/5  77/56/67/+13/0.03/0.0/222/26              29 SW  RMY N/A
5/6  74/54/64/+10/0.00/0.0/574/67              24 SSW RMY 25
5/7  84/52/68/+13/0.00/0.0/824/96              29 S   RMY 32
5/8  74/44/59/+4/0.00/0.0/809/94               27 NNE RMY 26
5/9  77/44/61/+6/0.00/0.0/509/59               30 S   RMY 32
5/10 88/60/74/+19/0.00/0.0/692/80              28 SSW RMY 30
5/11 84/48/66/+10/0.00/0.0/529/61              30 NE  RMY 31
5/12 84/47/66/+10/0.24/0.0/287/33              33 WNW RMY 37 
5/13 67/47/57/+1/0.00/0.0/.../..               31 WNW RMY N/A
 
5/14 low since midnight is 44F; normal low now 47F
 
DAILY RECORDS FOR MAY 2015
 
NONE SO FAR
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated): 
 
RECORDS FOR MAY 14
HIGH 85F IN 1961
LOW 33F IN 1895
PRECIP 1.93 INCHES IN 2006
PEAK GUST 53 MPH S IN 2009
 
RECORDS FOR MAY 15
HIGH 93F IN 1900
LOW 36F IN 1947,1985
PRECIP 1.63 INCHES IN 1978
PEAK GUST 53e MPH NE IN 1978, W 2002
 
TODAY'S REPORT PREPARED BY: Robert Skilling