BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MAY 23, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
ANOTHER BEAUTIFUL MAY DAY WITH SLIGHTLY WARMER
TEMPERATURES THAN YESTERDAY AND PARTLY SUNNY 
SKIES ALONG WITH MORE MOISTURE IN THE AIR
 
Along with mainly sunny conditions the temperature
is rising just a couple of degrees warmer than 
yesterday and has reached the lower 70's early this 
afternoon along dewpoint temperatures near 50 degrees
so it's not nearly as dry as yesterday's weather.  
Wind are from the south at gentle speeds.
 
Today's observations:
 
7 A.M.   
Weather: Thin broken middle and high clouds 
Temperature: 53F, Dew point: 49F, Wind: S at 07 kts 
Sea-level pressure: 30.47 inches Hg, rising   
Visibility: 15 miles, thin fog    
6- hourly min temp. 47 deg.  
BHO SA 1155 150 SCT 250 –BKN 15 317/53/49/1807/047/ 
STRA DSNT SSE-SSW THN F ALQDS/ 8/631 51012 10053 20047 
   
10 A.M.
Weather: Thin broken altocumulus clouds  
Temperature: 67F, Dew point: 47F, Wind: S at 09 kts
Wind: Direction S variable to SW 
Sea-level pressure: 30.48 inches Hg, steady   
Visibility: 35 miles, NE 30 miles, WNW 45 miles, light haze   
BHO SA 1455 100 –BKN 35 321/67/47/1909/048/ LGT HZ 
VSBY NE 30 WNW 45 WND 17V23/ 8/030 51004
 
1 P.M.
Weather: Scattered cumulus and altocumulus, thin broken altocumulus
Temperature: 72F, Dew point: 47F, Wind: SSW at 11 kts
Wind: direction SSE variable to SW  
Sea-level pressure: 30.44 inches Hg, falling   
Visibility: 40 miles, 45 miles WNW light haze  
BHO SA 1755 50 SCT 100 SCT 120 –BKN 40 309/72/47/2011/044/ 
FEW MDT CU ACSL ALQDS VSBY WNW 45 WND 15V22/
8/240 58012 10073 20053
 
WEATHER SUMMARY FOR TUESDAY, MAY 22 
 
TEMPERATURE (DEGREES F)
MAX.....71    NORMAL.....69 
MIN.....46    NORMAL.....49
MEAN....59    NORMAL.....59
DEPARTURE FROM 30-YEAR NORMAL........... 0
TOTAL DEPARTURE FOR THE MONTH..........+15 (+0.5 DEGREES/DAY)
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY........... 6  DEPARTURE........- 1
TOTAL HEATING UNITS FOR THE MONTH..........208  DEPARTURE........-11  
TOTAL HEATING UNITS FOR THE SEASON........5824  DEPARTURE.......-421
TOTAL HEATING UNITS LAST SEASON TO DATE...5686  DIFFERENCE......+138 
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............25 SSE AT 6:00 P.M.   
                   AEROVANE.............22 SSE AT 6:00 P.M. *
                   ASOS.................23 SSE AT 6:00 P.M.   
                   DAVIS................25 SE  AT 6:15 P.M.  
FASTEST MILE FOR YESTERDAY..............18 SSE AT 6:01 P.M.    
MAXIMUM 2-MINUTE ASOS AVERAGE...........18 SSE AT 6:03 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE..........19 SSE AT 6:01 P.M.   
AVERAGE WIND SPEED AND DIRECTION........ 9.3 NW
                   ASOS..................9.7 
                   DAVIS.................9.1 W [280 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..........3.71  DEPARTURE.....+1.02 
                         ASOS..............3.64    
TOTAL PRECIPITATION FOR THE YEAR..........24.13  DEPARTURE.....+3.39
                         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 morning low temp. 47 deg; normal now 49 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 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