BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MAY 27, 2015 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
HOT, HUMID, HAZY DAY. DROUGHT CONTINUES. 
 
Another day without rain has deepened the drought
on Great Blue Hill, with only 0.63 inches of rain
falling so far for the month of May. Showers may be
possible late in the evening, with thunderstorms possible
to our north and west; however any precipitation
is sorely needed. Below is a list of the driest
Mays on record:

BHO Driest Mays, inches (1885-2014)

1) 0.50 in 1944
2) 0.62 in 1964
3) 0.89 in 1911
4) 1.11 in 1899
5) 1.20 in 1959


Hazy conditions this morning have continued into the
afternoon. Visibility has been limited considerably
to just 20 miles in all directions due to haze.

By the 1:00 PM EST observation mostly clear but hazy
conditions were present, with some cumulus beginning
to develop from SW-NNE. A maximum of 82F had been
recorded by this time as well.


Today's Observations:
 
7 A.M.
Weather: Scattered altocumulus, broken cirrus,
few cumulus fractus distant SSE-S 
Temperature: 67F; Dew Point: 61F; Wind: S at 11 kts
Sea-level pressure: 30.18 ins. Hg, rising, then falling
Visibility: 20 miles, hazy and thin fog
6-hr Max temp: 67F
6-hr Min temp: 62F
24-hr precip: 0.00 ins.
BHO SA 1155 120 SCT E200 BKN 20 221/67/61/1911/018/ 
FEW CUFRA DSNT SSE-S THN FG ALQDS HAZY/ 8/731 50005 10067 20062
 
10 A.M.
Weather: Broken cirrus, few altocumulus distant NNW-NE
Temperature: 78F; Dew Point: 64F; Wind: S at 13G20 kts
Sea-level pressure: 30.17 ins. Hg, falling, then more quickly
Visibility: 20 miles, hazy
BHO SA 1455 E250 BKN 20 218/78/64/1913G20/017/ 
FEW AC DSNT NNW-NE HAZY/ 8/031 58003

1 P.M.
Weather: Scattered cirrus, few cumulus distant SE and SW-NNE,
few cirrocumulus lenticularis overhead and NW-ENE
Temperature: 82F; Dew Point: 65F; Wind: S at 18G25 kts
Sea-level pressure: 30.14 ins. Hg, falling, then more quickly 
Visibility: 25 miles, hazy
6-Hr Max temp: 82F
6-Hr Min temp: 67F
BHO SA 1755 250 SCT 25 206/82/65/1818G25/014/ 
FEW CU DSNT SE AND SW-NNE FEW CCSL OVHD AND NW-ENE HAZY 
PK WND 2027/10/ 8/101 58012 10082 20067

 
SUMMARY FOR TUESDAY, MAY 26, 2015 
  
TEMPERATURE (DEGREES F)
MAX.....83   NORMAL.....69
MIN.....61   NORMAL.....51
MEAN....72   NORMAL.....60
 
DEPARTURE FROM 30-YEAR NORMAL.......................+12
TOTAL DEPARTURE FOR THE MONTH......................+118 [+4.3 DEGREES/DAY]
 
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............0  DEPARTURE...........-6
TOTAL HEATING UNITS FOR THE MONTH.............130  DEPARTURE.........-111 
TOTAL HEATING UNITS FOR THE SEASON...........6401  DEPARTURE.........+126
TOTAL HEATING UNITS LAST SEASON TO DATE......6337  DIFFERENCE.........+64
 
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............7   DEPARTURE..........+6
TOTAL COOLING UNITS FOR THE MONTH.............27   DEPARTURE.........+12
TOTAL COOLING UNITS FOR THE SEASON............27   DEPARTURE.........+10
TOTAL COOLING UNITS LAST SEASON TO DATE.......13   DIFFERENCE........+14
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..................30  SSW  AT   2:57 A.M.          
                   ASOS.......................31  SSW  AT   2:57 A.M.            
                   DAVIS......................29  SSW  AT   N/A       RMY N/A
FASTEST MILE FOR YESTERDAY....................24  SSW  AT   2:52 A.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE.................24  SSW  AT   3:29 A.M.            
MAXIMUM 2-MINUTE DAVIS AVERAGE................24  SSW  AT   2:53 A.M.     
AVERAGE WIND SPEED AND DIRECTION.............17.1 SSW       
                   ASOS......................17.7     
                   DAVIS.....................16.2 SSW [209 deg.]  
* Last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.00  DEPARTURE.....-0.15
                         ASOS...............0.00
TOTAL PRECIPITATION FOR THE MONTH...........0.63  DEPARTURE.....-2.73 
                         ASOS...............0.63
TOTAL PRECIPITATION FOR THE YEAR...........18.55  DEPARTURE.....-3.23
                         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/+1/0.00/0.0/820/94               31 WNW RMY N/A
5/14 70/44/57/+0/0.00/0.0/848/97               22 NW  RMY 22
5/15 73/51/62/+5/0.00/0.0/491/56               20 WSW RMY 21
5/16 68/53/61/+4/T/0.0/053/06                  23 S   RMY 24
5/17 79/50/65/+8/T/0.0/783/89                  21 NE  RMY N/A
5/18 62/48/55/-3/..../0.0/538/61               25 NE  RMY N/A
5/19 63/50/57/-1/0.36/0.0/000/00               24 S   RMY 26
5/20 66/46/56/-2/0.00/0.0/.../..               32 WNW RMY 37 
5/21 66/43/55/-4/..../0.0/.../..               24 S   RMY 24
5/22 73/49/61/+2/T/0.0/.../..                  32 NW  RMY 36
5/23 64/40/52/-7/0.00/0.0/.../..               28 WNW RMY 32
5/24 81/50/66/+7/0.00/0.0/.../..               28 SSW RMY 31
5/25 80/56/68/+8/0.00/0.0/.../..               29 SSW RMY 31
5/26 83/61/72/+12/0.00/0.0/.../..              30 SSW RMY N/A

5/27 low since midnight is 62F; normal low is now 51F
 
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 27
HIGH 92F IN 1914
LOW 36F IN 1915
PRECIP 1.40 INS IN 1898
PEAK GUST 55 S IN 1956

RECORDS FOR MAY 28
HIGH 90F IN 1929
LOW 39F IN 1917
PRECIP 2.48 INS 1906
PEAK GUST 51e MPH NE IN 1946

TODAY'S REPORT PREPARED BY: Brian Fitzgerald