BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, MAY 23, 2013 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
CLOUDY WARM AND HUMID WITH A.M. SHOWERS
S-SSW WINDS BECOMING GUSTY TO 20 TO 35 MPH
 
The day began with heavy fog here at the summit as
a warm and very humid air mass arrived. This resulted
in considerable condensation as the dew point rose from
53F in the very early hours to 64F by 8 A.M. EDT
A few light rain showers left 0.02 inch by early
this afternoon.
South to south-southwest winds were increasing and
becoming gusty to over 30 MPH early this afternoon
as the temperature rose to a humid 72 degrees. 
 
Today's observations:
 
7 A.M.
Weather: Obscurement with heavy fog 
Temperature: 64F; Dew Point: 64F; Wind: S at 13 kts
Sea-level pressure: 29.90 ins. Hg, about steady
Visibility: 1/16 mile, heavy fog
6-hr min. temp: 54F
24-hr precip: 0.00 inch
BHO SA 1155 W2 X 1/16F 127/64/64/1913/990/ HVY CONDENSATION/
8//// 50002 ASOS 60001 ASOS 70001 10064 20054
 
10 A.M.
Weather: Overcast stratus, bright spots in overcast
Temperature: 67F; Dew Point: 65F; Wind: SSW at 12 kts
Sea-level pressure: 29.92 ins., rising then more slowly
Visibility: 8 miles, thin fog, hazy   
3-hourly precip: trace
BHO SA 1455 E7 OVC 8 132/67/65/2012/992/ BRGHT SPTS IOVC
THN F HAZY/ 8/6// 51005 MANUAL 6000/
 
1 P.M.
Weather: Overcast stratocumulus, bright spots in overcast,
small breaks in overcast 
Temperature: 71F; Dew Point: 67F; Wind: S at 15 kts
Sea-level pressure: 29.90 ins. Hg, falling then more rapidly 
Visibility: 8 miles, except 6 miles NW-E, 9 miles SW,
thin fog and hazy  
6-hour max temp: 72F
6-hour precip: 0.02 in. 
BHO SA 1755 E11 OVC 9 124/71/67/1915/990/ BRGHT SPTS SML BINOVC
HAZY/ 8/5// 58008 ASOS 60001 MANUAL 6002/ 10072 20064
 
WEATHER SUMMARY FOR WEDNESDAY, MAY 22, 2013
 
TEMPERATURE (DEGREES F)
MAX.....66     NORMAL.....68
MIN.....48     NORMAL.....50
MEAN....57     NORMAL.....59
 
DEPARTURE FROM 30-YEAR NORMAL....................-2
TOTAL DEPARTURE FOR THE MONTH...................+49 [+2.0 DEGREES/DAY]
 
HEATING DEGREE DAYS 
TOTAL HEATING UNITS FOR YESTERDAY.............8   DEPARTURE..........+1
TOTAL HEATING UNITS FOR THE MONTH...........158   DEPARTURE.........-57
TOTAL HEATING UNITS FOR THE SEASON.........5680   DEPARTURE........-570
TOTAL HEATING UNITS LAST SEASON TO DATE....4888   DIFFERENCE.......+792
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...............27 WNW AT  3:00 A.M. 
                   AERO....................25 WNW AT  3:00 A.M. 
                   ASOS....................28 WNW AT  3:00 A.M. 
                   DAVIS...................26 WNW AT  3:00 A.M. RMY: N/A
FASTEST MILE FOR YESTERDAY.................19 WNW AT  2:59 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..............18 WNW AT  3:01 A.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE.............19 WNW AT  2:59 A.M. 
AVERAGE WIND SPEED AND DIRECTION......... 7.7
                   ASOS...................6.8
                   DAVIS..................7.5 E [080 deg]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE...........-0.14
                         ASOS..............0.01
TOTAL PRECIPITATION FOR THE MONTH..........1.26  DEPARTURE...........-1.49
TOTAL ASOS PRECIPITATION FOR MONTH.........1.21
TOTAL PRECIPITATION FOR THE YEAR..........17.64  DEPARTURE...........-3.66
                         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 morning low temp: 53F; 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 23
HIGH 92F IN 1964,1992
LOW 38F IN 1976
PRECIP 0.97 INS IN 1979
PEAK GUST 49e MPH W IN 1945
 
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
 
TODAY'S REPORT PREPARED BY: Robert Skilling