BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, MAY 28, 2007, MEMORIAL DAY   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
JUST A TRACE OF RAIN THIS MORNING
MORE THAN A WEEK OF DRY WEATHER CONTINUES
 
A period of light rain this morning was barely enough to 
wet the ground so just a trace of rainfall was recorded. 
Clearing by noon brought rapidly rising temperatures 
heading toward 80 degrees.
 
Today will become the 8th consecutive day with no measurable
rainfall following six consecutive days with rainfall 
from May 15-20.   
 
Today's observations:
 
7 A.M.   
Weather: Overcast high clouds  
Temperature: 64F, Dew point: 59F, Wind: SSW at 11 kts 
Sea-level pressure: 30.08 inches Hg, rising  
Visibility: 8 miles, thin fog/hazy     
6-hour min temp. 58 deg.   
BHO SA 1155 140 SCT E200 BKN 250 OVC 8 186/64/59/2011/008/ 
DENSE CI HAZY/ 8/042 53007 10064 20059 
    
10 A.M. 
Weather: Overcast, very light rain 
Temperature: 67F, Dew point: 61F, Wind: WSW at 09 kts
Sea-level pressure: 30.08 inches Hg, steady
Visibility: 9 miles, hazy   
BHO SA 1455 E95 OVC 9R- 186/67/61/2409/008/ HAZY PCPN VRY LGT/
8/07/ 53000 MANUAL 6000/ 
 
1 P.M. 
Weather: Scattered cumulus, thin broken cirrus  
Temperature: 80F, Dew point: 59F, Wind: SW at 10G22 kts
Wind: direction variability SSW-W
Sea-level pressure: 30.08 inches Hg, steady
Visibility: 12 miles, hazy     
BHO SA 1755 55 SCT 220 SCT 250 –BKN 300 –BKN 12 167/80/59/2310G22/002/
FEW MDT CU HAZY WND 20V27/ 8/202 58019 10081 20064
 
WEATHER SUMMARY FOR SUNDAY, MAY 27 
 
TEMPERATURE (DEGREES F)
MAX.....73    NORMAL.....71 
MIN.....58    NORMAL.....50
MEAN....66    NORMAL.....61
DEPARTURE FROM 30-YEAR NORMAL..........+ 5
TOTAL DEPARTURE FOR THE MONTH..........+65 (+2.2 DEGREES/DAY)
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............0  DEPARTURE.........-6
TOTAL HEATING UNITS FOR THE MONTH..........212  DEPARTURE........-38  
TOTAL HEATING UNITS FOR THE SEASON........5828  DEPARTURE.......-448
TOTAL HEATING UNITS LAST SEASON TO DATE...5711  DIFFERENCE......+117 
 

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............22 SSE AT 11:34 P.M. * 
                   AEROVANE.............21 SSE AT 11:34 P.M. *
                   ASOS.................21 S   AT 11:34 P.M. ** 
                   DAVIS................26 S   AT 11:50 P.M.   
FASTEST MILE FOR YESTERDAY..............16 SSE AT 11:34 P.M. *     
MAXIMUM 2-MINUTE ASOS AVERAGE...........17 S   AT 11:09 P.M. **  
MAXIMUM 2-MINUTE DAVIS AVERAGE..........N/A    
AVERAGE WIND SPEED AND DIRECTION........ 8.9 NE
                   ASOS................. 8.8 **  
                   DAVIS.................8.5 ENE [060 deg]
*  last of several occurrences
** NEW ASOS ULTRASONIC WIND SYSTEM INSTALLED 25 MAY
 
 
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..........3.71  DEPARTURE.....+0.42 
                         ASOS..............3.64    
TOTAL PRECIPITATION FOR THE YEAR..........24.13  DEPARTURE.....+2.89
                         ASOS.............23.61    
 
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..............27.6  DEPARTURE.....-32.5  
    
PRELIMINARY CLIMATE SUMMARY FOR MAY 2007......CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
 
AERO: Aerovane recording wind system when significant
TSTM: Thunderstorm day
....: Data not yet available
 
5/1  67/44/56/+4/0/0/624/74      33 NW 
5/2  64/45/55/+3/0.06/0/381/45   36 NW    Aero 33 MPH WNW
5/3  67/42/55/+2/0/0/849/100     38 W     Aero 37 MPH W
5/4  66/44/55/+2/0/0/842/99      39 WNW   Aero 40 MPH WNW 
5/5  65/45/55/+2/0/0/384/45      33 N  
5/6  51/42/47/-7/T/0/514/60      36 N     Aero 33 MPH N 
5/7  68/39/54/0/0/0/798/93       25 S
5/8  77/43/60/+6/0/0/851/99      33 S     Aero 31 MPH S 
5/9  85/54/70/+15/0/0/707/92     30 S 
5/10 85/60/73/+18/0/0/692/80     29 S     Aero 27 MPH S
5/11 74/60/67/+12/0.02/0/355/41  23 S     TSTM A.M.  
5/12 63/47/55/-1/0.02/0/469/54   32 NE    
5/13 65/46/56/0/T/0/775/89       33 WNW   Aero 33 MPH WNW 
5/14 73/43/58/+1/0/0/822/94      30 SSW
5/15 80/50/65/+8/0.01/0/210/24   30 S     TSTM evening   
5/16 66/44/55/-2/0.54/0/527/60   40 NW    TSTM P.M.  
5/17 50/42/46/-11/0.01/0/009/01  28 NE  
5/18 42/39/41/-17/1.93/0/000/00  37 NNE
5/19 51/40/46/-12/0.71/0/000/00  25 NNW
5/20 59/49/54/-4/0.41/0/035/04   30 W     TSTM P.M.  
5/21 63/46/55/-4/0/0/693/78      29 WNW
5/22 71/46/59/0/0/0/800/90       25 SSE  
5/23 74/47/61/0/0/757/85         30 SSE 
5/24 86/50/68/+8/0/0/.../..      25 WSW
5/25 91/66/79/+19/0/0/.../..     24 W
5/26 85/66/76/+16/0/0/.../..     30 W  
5/27 73/58/66/+5/0/0/.../..      22 SSE
 
5/28 morning low temp. 58 deg; normal now 51 deg. 
     a trace of rain after 7 a.m. this morning    
 
NEW DAILY RECORDS FOR MAY:
 
5/18 Record low maximum temperature, 42; previous 48 in 1895 and 1956.
5/18 Record daily precipitation, 1.93; previous 1.58 inches in 2002.
5/25 Record high maximum temperature, 91; previous 89 in 1981.
5/25 Record high minimum temperature, 66; previous 65 in 1991.
5/26 Record high minimum temperature, 66; previous 63 in 1981.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MAY 28
HIGH 90F IN 1929
LOW 39F IN 1917
PRECIP 2.48 INCHS 1906
PEAK GUST 51e MPH NE IN 1946
 
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
 
TODAY'S REPORT PREPARED By: Robert Skilling