BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MAY 29, 2013
ALL TIMES ARE IN EASTERN STANDARD TIME
 
RAINFALL AHEAD OF APPROACHING WARM FRONT EARLY MORNING
DOWNPOUR JUST AFTER 6 A.M. EDT ADDS TO 0.32 HOURLY TOTAL
 
A significant amount of rain fell this morning totaling
0.69 inch with 0.32 in one hour from 6 to 7 A.M. EDT
The precipitation occurred in advance of a warm front
expected to arrive later today with possible more showers
and thunderstorms before the warm and humid air moves in.
 
The low stratus clouds were thinning early this afternoon
with temperatures rising through the mid 60's and dew points
rising into the low 60's.
 
With the anticipation of hot temperatures later this week, below are the
current records at Blue Hill:
 
May 30  93F in 1929
May 31  92F in 1944, 1987
June 1  90F in 1937
 
Today's observations:
 
7 A.M.
Weather: Obscurement with heavy fog
Temperature: 57F; Dew Point: 57F; Wind: S at 11 kts.
Sea-level pressure: 30.12 ins. Hg, falling slightly
Visibility: 1/16 variable to 1/8 mile, light rain and fog
6-hr min. temp: 56F
6-hour rainfall: 0.66 inch
24-hour rainfall: 0.66 inch
BHO SA 1155 W3 X 1/16VR-F 199/57/57/1811/012/ STFRA DRFTG OVR SMT
VSBY 1/16V1/8/ 8//// 58002 ASOS 60066 MANUAL 6066/
ASOS 70066 MANUAL 70066 10057 20056
 
10 A.M.
Weather: Partial obscurement, 3/10 with fog, overcast stratus 
Temperature: 59F; Dew Point: 59F; Wind: SSW at 7 kts,
Sea-level pressure: 30.11 ins. Hg, falling slightly
Visibility: 1/4 mile, variable 1/8 to 1/2 mile,
Visibility: Increasing  
BHO SA 1455 –X E3 OVC 1/4VF 196/59/59/2107/011/F3 STFRA DRFTG OVR SMT
VSBY 1/8V1/2/ 8/6// 56003 ASOS 60003 MANUAL 6003/
 
1 P.M.
Weather: Overcast stratus, numerous bright spots in the overcast
Temperature: 65F; Dew Point: 62F; Wind: NW at 3 kts,
Wind: Light 
Sea-level pressure: 30.08 ins. Hg, falling then rising slightly
Visibility: 10 miles, thin fog and hazy  
6-hour max temp: 65F
6-hour precip: 0.03 inch 
BHO SA 1755 E6 OVC 10 186/65/62/3203/008/ NMRS BRGHT SPTS IOVC THN F HZY
WND LGT/ 8/6// 55010 ASOS 60003 MANUAL 6003/ 10065 20057
 
WEATHER SUMMARY FOR TUESDAY, MAY 28, 2013
 
TEMPERATURE (DEGREES F)
MAX.....74     NORMAL.....70
MIN.....55     NORMAL.....51
MEAN....65     NORMAL.....61
 
DEPARTURE FROM 30-YEAR NORMAL....................+4
TOTAL DEPARTURE FOR THE MONTH...................+27 [+0.8 DEGREE/DAY]
 
HEATING DEGREE DAYS 
TOTAL HEATING UNITS FOR YESTERDAY.............0   DEPARTURE..........-6
TOTAL HEATING UNITS FOR THE MONTH...........211   DEPARTURE.........-41
TOTAL HEATING UNITS FOR THE SEASON.........5733   DEPARTURE........-554
TOTAL HEATING UNITS LAST SEASON TO DATE....4888   DIFFERENCE.......+845
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...............20 S   AT 10:54 P.M.
                   AERO....................20 S   AT 10:54 P.M.
                   ASOS....................21 S   AT 10:54 P.M.
                   DAVIS...................20 S   AT 10:54 P.M. RMY: 21
FASTEST MILE FOR YESTERDAY.................13 S   AT 10:53 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..............14 S   AT 11:49 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.............15 S   AT 10:54 P.M.
AVERAGE WIND SPEED AND DIRECTION......... 8.0 S
                   ASOS...................8.2
                   DAVIS..................7.2 ESE [120 deg]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.66  DEPARTURE...........+0.51
                         ASOS..............0.66
TOTAL PRECIPITATION FOR THE MONTH..........3.20  DEPARTURE...........-0.46
TOTAL ASOS PRECIPITATION FOR MONTH.........3.12
TOTAL PRECIPITATION FOR THE YEAR..........19.58  DEPARTURE...........-2.63
                         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/-3/0.04/009/01         27 WNW AERO 25 MPH WNW RMY N/A
5/23 74/53/64/+5/0.09/036/04         35 S   AERO 39 MPH S   RMY 40
5/24 68/49/59/0/0.57/000/00          33 S   AERO 35 MPH S   RMY N/A
5/25 50/39/45/-15/0.59/000/00        32 NW  AERO 35 MPH NW  RMY 32
5/26 58/37/48/-12/0.03/.../..        44 NW  AERO 44 MPH NW  RMY 45
5/27 70/41/56/-4/0.00/.../..         33 WNW AERO 33 MPH WNW RMY 36
5/28 74/55/65/+4/0.00/.../..         20 S   AERO 20 MPH S   RMY 21
 
5/29 morning low temp: 56F; the normal low is now 52F
 
DAILY RECORDS FOR MAY 2013
5/26- TIED DAILY RECORD MINIMUM TEMPERATURE OF 37F;
      record of 37F set in 1972.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MAY 29
HIGH 93F IN 1919
LOW 35F IN 1902
PRECIP 1.63 INS 1990
PEAK GUST 55e MPH NNW IN 1943, WNW IN 1945
 
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
 
TODAY'S REPORT PREPARED BY: Robert Skilling