BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, MAY 14, 2009 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.  
Weather: Overcast cirrus, numerous breaks in overcast
all quadrants, hazy
Temperature: 54F, Dew point: 45F, Wind: SSE at 13G25 kts,
Wind: Peak gust past hour 27 kts SSE at 6:23 A.M.
Wind: Direction variable ESE to SSW
Sea-level pressure: 30.40 inches Hg, falling
Visibility: 30 miles, 40 miles W-NW
6-hour minimum temp: 47F
BHO SA 1155 E220 OVC 30 296/54/45/1513G25/040/
NMRS BINOVC ALQDS HAZY VSBY W-NW 40
PK WND 1527/23 WND 11V21/ 8/004 58003 10054 20047
 
10 A.M.  
Weather: Overcast stratocumulus, light rain
Temperature: 57F, Dew point: 42F, Wind: SSE at 16G29 kts
Wind: Peak gust past hour 33 kts SSE at 8:56 A.M.
Wind: Direction variable ESE to SSW
Sea-level pressure: 30.38 inches Hg, falling
Visibility: 25 miles, hazy
BHO SA 1455 E45 BKN 60 OVC 25R- 289/57/42/1616G29/038/
DSNT VIRGA ALQDS XCPT N-E HAZY PK WND 1533/1356 WND 11V21
RB55 PCPN VRY LGT / 8/5// 55007 MANUAL 6000/
 
1 P.M.  
Weather: Scattered stratocumulus, overcast altostratus,
few stratocumulus lenticularis, light rain
Temperature: 59F, Dew point: 48F, Wind: SSE at 29G38 kts,
Wind: Peak gust past hour 38 kts SSE at 12:53 P.M.
Wind: Direction variable ESE to SSW
Sea-level pressure: 30.30 inches Hg, falling
Visibility: 12 miles
6-hour maximum temp: 62F  
BHO SA 1755 35 SCT E85 OVC 12R- 262/59/48/1629G38/030/
FEW SCSL PK WND 1538/53 WND 12V21 RB05/
8/52/ 58027 MANUAL 6000/ 10062 20053
 
WEATHER SUMMARY FOR WEDNESDAY, MAY 13
 
TEMPERATURE (DEGREES F)
MAX.....70    NORMAL.....66
MIN.....45    NORMAL.....46
MEAN....58    NORMAL.....56
 
DEPARTURE FROM 30-YEAR NORMAL...........+2
TOTAL DEPARTURE FOR THE MONTH..........+36 [+2.6 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............7  DEPARTURE.......-2
TOTAL HEATING UNITS FOR THE MONTH...........107  DEPARTURE......-40
TOTAL HEATING UNITS FOR THE SEASON.........6003  DEPARTURE.....-170
TOTAL HEATING UNITS LAST SEASON TO DATE....5784  DIFFERENCE....+219
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............31 SSE AT  2:32 P.M. 
                   AEROVANE.............29 SSE AT  4:35 P.M. 
                   ASOS.................31 S   AT  5:35 P.M.   
                   DAVIS................29 S   AT  2:00 P.M.  
FASTEST MILE FOR YESTERDAY..............23 S   AT  2:00 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE...........23 SSW AT  2:03 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE..........23 S   AT  2:02 P.M.  
AVERAGE WIND SPEED AND DIRECTION...... 12.0 SSE
                   ASOS................11.6
                   DAVIS...............10.3 S  [188 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..........2.15  DEPARTURE....+0.54
                         ASOS..............2.14 
TOTAL PRECIPITATION FOR THE YEAR..........16.76  DEPARTURE....-2.80
                         ASOS.............17.82 
 
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.....-0.1
TOTAL SNOWFALL FOR THE SEASON..............78.9  DEPARTURE.....18.8 
 
PRELIMINARY CLIMATE SUMMARY FOR MAY 2009 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane recording wind system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
5/1  64/53/59/+7/T/000/00          37 SSW   AERO 37 MPH SSW
5/2  68/52/60/+8/0.05/263/31       32 WNW
5/3  64/48/56/+3/T/068/08          25 S
5/4  64/48/56/+3/0.01/009/01       17 SSW
5/5  52/44/48/-5/0.95/000/00       43 NNE   AERO 40 MPH NNE
5/6  63/43/53/-1/0.40/189/22       24 SSE  
5/7  68/49/59/+5/0.60/009/01       29 S    
5/8  75/52/64/+10/0/690/80         28 S
5/9  71/55/63/+8/0.13/104/12       31 W     TSTM
5/10 65/46/56/+1/0/840/97          53 W     Aero 50 MPH W
5/11 63/41/52/-3/0/781/90          24 WNW
5/12 63/45/54/-2/0/.../..          22 ENE
5/13 70/45/58/+2/0/.../..          31 SSE   AERO 29 MPH SSE
 
5/14 morning low temp: 47F, our normal low temp. 46F
 
NEW DAILY RECORDS FOR MAY 2009...
NONE
 
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 50e MPH SW IN 1976
 
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: Stephanie Radner