BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, MAY 24, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
CLEAR AND SUNNY WITH INCREASING HAZE TODAY
WARMER TEMPERATURES RISING THROUGH TOWARD THE 80S
THE FEEL OF SUMMER MAY BRING HIGH TEMPERATURES
CLOSE TO THE RECORD HIGH OF 89 DEGREES TOMORROW
 
Today is still another in our series of sunny and 
dry beautiful mid-late May days but with temperatures
rising steadily from a normal morning low of 50 degrees
toward the 80's for this afternoon. Yesterday became the
first above normal day in temperature in the past week
by two degrees, but today will become several degrees 
warmer than average. 
Visibility is decreasing from the 60 to 70 miles
yesterday to 20 to 30 miles in increasing amounts of haze. 
 
Tomorrow the continued warming trend may lead to high 
temperatures getting to at least the upper 80's with a 
possibility we might challenge the record high of 89 
degrees which occurred on May 25, 1981.   
 
Today's observations:
 
7 A.M.   
Weather: High thin scattered cirrus  
Temperature: 57F, Dew point: 50F, Wind: SW at 06 kts 
Sea-level pressure: 30.40 inches Hg, falling   
Visibility: 25 miles, hazy     
6- hourly min temp. 50 deg.  
BHO SA 1155 300 –SCT 25 294/57/49/2206/040/ HAZY/
8/001 50003 10057 20050 
   
10 A.M.
Weather: Clear  
Temperature: 71F, Dew point: 54F, Wind: SSW at 04 kts
Sea-level pressure: 30.37 inches Hg, falling   
Visibility: 25 miles, hazy      
BHO SA 1455 CLR 25 283/71/54/2104/037/ HAZY WND LGT/ 58011
 
1 P.M.
Weather: Clear
Temperature: 82F, Dew point: 56F, Wind: S at 04 kts
Wind: direction light and variable  
Sea-level pressure: 30.29 inches Hg, falling   
Visibility: 20 miles, 25 miles WNW, hazy  
BHO SA 1755 CLR 20 257/82/56/2004/029/ HAZY VSBY WNW 25 
WND LGT/ 57026 10082 20057
 

WEATHER SUMMARY FOR WEDNESDAY, MAY 23 
 
TEMPERATURE (DEGREES F)
MAX.....74    NORMAL.....69 
MIN.....47    NORMAL.....49
MEAN....61    NORMAL.....59
DEPARTURE FROM 30-YEAR NORMAL...........+2
TOTAL DEPARTURE FOR THE MONTH..........+17 (+0.5 DEGREES/DAY)
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY........... 4  DEPARTURE........- 3
TOTAL HEATING UNITS FOR THE MONTH..........212  DEPARTURE........-14  
TOTAL HEATING UNITS FOR THE SEASON........5828  DEPARTURE.......-424
TOTAL HEATING UNITS LAST SEASON TO DATE...5700  DIFFERENCE......+128 
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............30 SSE AT 4:49 P.M. * 
                   AEROVANE.............28 SSE AT 4:49 P.M. 
                   ASOS.................28 S   AT 5:09 P.M.   
                   DAVIS................30 SSE AT 4:50 P.M.  
FASTEST MILE FOR YESTERDAY..............23 S   AT 4:26 P.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE...........23 S   AT 5:09 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE..........20 SSE AT 4:50 P.M.   
AVERAGE WIND SPEED AND DIRECTION........12.8 S 
                   ASOS.................13.8  
                   DAVIS................11.5 S [180]
* 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..........3.71  DEPARTURE.....+0.90 
                         ASOS..............3.64    
TOTAL PRECIPITATION FOR THE YEAR..........24.13  DEPARTURE.....+3.27
                         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 morning low temp. 50 deg; normal now 50 deg.
 
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.
 
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 89F IN 1981
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: Robert Skilling