BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, MAY 24, 2013 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
OVERCAST AND FOGGY WITH REDUCED VISIBILITY AND LIGHT RAIN
 
Today was another cloudy and foggy day, as a frontal system continues to
slowly push through. Humidity has been in the 90s the for most of the day
with dew points in the low 60s. Winds have been out of the south for the
second consecutive day ahead of the front which is expected to bring more
rain with it tonight. Blue Hill received 0.31 inch of rain last night,
which is still considered much needed rainfall after such a dry start to
the month. Brief showers began just before 11:00 EDT but only amounted
to 0.04 inch by 2:00 EDT.
 
Today's observations:
 
7 A.M.
Weather: Obscurement with heavy fog, stratus fractus drifting over and below
the summit, wet surfaces 
Temperature: 63F; Dew Point: 63F; Wind: SE at 12 kts
Sea-level pressure: 29.70 ins. Hg, steady then increasing
Visibility: 1/16 mile, heavy fog, ESE-SSE 1/2 mile
6-hr min. temp: 62F
24-hr precip: 0.31 inch
BHO SA 1155 W3 X 1/16F 057/63/63/1512/970/ STFRA DRFTG OVR AND BLO
SMT WET SFCS VSBY HIER ESE-SSE 1/2/ 8//// 53007 ASOS 60018 MANUAL
600XX ASOS 70031 MANUAL 70031 10063 20062
 
10 A.M.
Weather: Overcast with light rain and fog with stratus fractus drifting below
the summit, hazy
Temperature: 64F; Dew Point: 63F; Wind: S at 9 kts
Sea-level pressure: 29.74 ins., increasing
Visibility: Variable 3-5 miles, light rain, thin fog, and haze NNE-NE 12 miles
3-hourly precip: 0.01 inch
BHO SA 1455 E7 OVC 3V5R-F 072/64/63/1909/974/ STFRA DRFTG BLO SMT HAZY VSBY
HIER NNE-NE 12 R-BUKN CTD/ 8/7// 51015 ASOS 60000 MANUAL 60001
 
1 P.M.
Weather: Broken stratus fractus and overcast altostratus with light rain
and fog, stratus fractus drifting below summit, hazy
Temperature: 66F; Dew Point: 64F; Wind: S at 6 kts
Sea-level pressure: 29.73 ins. Hg, decreasing
Visibility: 10 miles, light rain, thin fog, and haze 
6-hour max temp: 66F
6-hour precip: 0.04 in. 
BHO SA 1755 E9 BKN 100 OVC 10R-F 069/66/64/1806/973/ STFRA DRFTG BLO SMT HAZY
R-BUKN CTD/ 8/77/ 58003 ASOS 60003 MANUAL 60004 10066 20062
 
WEATHER SUMMARY FOR THURSDAY, MAY 23, 2013
 
TEMPERATURE (DEGREES F)
MAX.....74     NORMAL.....68
MIN.....53     NORMAL.....50
MEAN....64     NORMAL.....59
 
DEPARTURE FROM 30-YEAR NORMAL....................+5
TOTAL DEPARTURE FOR THE MONTH...................+54 [+2.1 DEGREES/DAY]
 
HEATING DEGREE DAYS 
TOTAL HEATING UNITS FOR YESTERDAY.............1   DEPARTURE..........-6
TOTAL HEATING UNITS FOR THE MONTH...........159   DEPARTURE.........-63
TOTAL HEATING UNITS FOR THE SEASON.........5681   DEPARTURE........-575
TOTAL HEATING UNITS LAST SEASON TO DATE....4888   DIFFERENCE.......+793
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...............35 S   AT  2:24 P.M. * 
                   AERO....................39 S   AT  2:10 P.M. 
                   ASOS....................40 S   AT  2:10 P.M. 
                   DAVIS...................38 SSW AT  2:13 P.M. RMY: 40
FASTEST MILE FOR YESTERDAY.................30 S   AT  2:15 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE..............31 SSW AT  2:13 P.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE.............31 SSW AT  2:13 P.M. 
AVERAGE WIND SPEED AND DIRECTION.......... 16.6 S
                   ASOS....................16.4
                   DAVIS...................14.6 SSW [196 deg]
*...last of several occurrences
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.31  DEPARTURE...........+0.16
                         ASOS..............0.31
TOTAL PRECIPITATION FOR THE MONTH..........1.57  DEPARTURE...........-1.33                         ASOS..............1.02
TOTAL ASOS PRECIPITATION FOR MONTH.........1.52
TOTAL PRECIPITATION FOR THE YEAR..........17.95  DEPARTURE...........-3.50
                         ASOS..............N/A*
*ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals
                       
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.............99.0   DEPARTURE...........+36.3
 
PRELIMINARY CLIMATE SUMMARY FOR MAY 2013 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust
RMY:  RMY = R.M. Young wind gust recording system added 8/9/2011
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
                             
5/1  67/45/56/+3/0.00/845/100        18 E   AERO 16 MPH E   RMY 17
5/2  75/43/59/+6/T/669/79            29 NE  AERO 26 MPH NE  RMY 29
5/3  54/42/48/-5/0.00/706/83         24 NE  AERO 25 MPH NE  RMY 28
5/4  55/40/48/-6/0.00/843/99         21 NE  AERO 23 MPH NE  RMY 23
5/5  58/37/48/-6/0.00/752/88         17 ENE AERO 17 MPH ENE RMY 20
5/6  66/40/53/-1/0.00/600/70         17 S   AERO 18 MPH S   RMY 20
5/7  77/50/64/+9/0.00/807/94         21 S   AERO 23 MPH S   RMY 25
5/8  71/55/63/+8/0.42/112/13         31 SSE AERO 35 MPH SSE RMY 35 TSTM
5/9  66/56/61/+6/0.41/078/09         16 NE  AERO 16 MPH NE  RMY 18 TSTM
5/10 79/54/67/+12/T/333/63           18 S   AERO 21 MPH S   RMY N/A
5/11 70/56/63/+7/0.06/026/03         43 SSW AERO 44 MPH SSW RMY 46
5/12 71/47/59/+3/0.05/339/39         30 W   AERO 32 MPH W   RMY 32
5/13 60/41/51/-5/0.00/821/94         25 WSW AERO 28 MPH WSW RMY 30
5/14 58/38/48/-9/T/385/44            22 W   AERO 24 MPH W   RMY 25
5/15 65/41/53/-4/0.02/456/52         35 S   AERO 38 MPH S   RMY 40
5/16 80/51/66/+9/0.00/844/96         40 W   AERO 45 MPH W   RMY 42
5/17 69/50/60/+3/0.00/872/99         24 NW  AERO 28 MPH NW  RMY 27
5/18 73/47/60/+2/0.00/689/78         21 SE  AERO 24 MPH SE  RMY 24
5/19 71/50/61/+3/0.11/407/46         21 S   AERO 23 MPH S   RMY 24
5/20 81/54/68/+10/0.01/496/56        21 S   AERO 21 MPH S   RMY N/A
5/21 81/49/65/+6/0.14/506/57         29 NE  AERO 31 MPH NE  RMY 32 TSTM 
5/22 66/48/57/-3/0.04/.../..         27 WNW AERO 25 MPH WNW RMY N/A
5/23 74/53/64/+5/..../.../..         35 S   AERO 39 MPH S   RMY 40
 
5/24 morning low temp: 62F; the normal low is now 50F
 
DAILY RECORDS FOR MAY 2013
None so far.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
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
 
RECORDS FOR MAY 25
HIGH 91F IN 2007
LOW 37F IN 1967
PRECIP 3.73 INS IN 1967
PEAK GUST 83 MPH NE IN 1967 (RECORD FOR MAY)
  
TODAY'S REPORT PREPARED BY: George Tabeek