BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, MAY 1, 2008  
ALL TIMES ARE IN EASTERN STANDARD TIME UNLESS NOTED
 
Today's observations:
 
8 A.M. EDT
Weather: Clear
Temperature: 41F, Dew point: 25F,  Wind: WNW at 6 kts  
Sea-level pressure: 30.22 inches Hg, rising 
Visibility: 50 miles
6-hour min temp: 35F 
BHO SA 1155 CLR 50 233/41/25/3006/022/ THN K LYR ALQDS/ 51014 
10041 20035
 
11 A.M. EDT
Weather: Clear, few cumulus
Temperature: 53F, Dew point: 21F,  Wind: W at 4 kts
Wind: Light and variable  
Sea-level pressure: 30.19 inches Hg, falling
Visibility: 35 miles, light haze
BHO SA 1455 CLR 35 225/53/21/2804/019/ FEW CU LGT HZ WND L/V/ 
8/100 58004
 
2 P.M. EDT
Weather: Broken stratocumulus
Temperature: 57F, Dew point: 20F,  Wind: W at 8 kts
Wind: Variable direction S-NW  
Sea-level pressure: 30.14 inches Hg, falling
Visibility: 35 miles, light haze
6-hour max. temp: 58F
BHO SA 1755 E75 BKN 35 205/57/20/2708/014/ LGT HZ WND 18V31/ 
8/500 58020 10058 20041
 
WEATHER SUMMARY FOR WEDNESDAY, APRIL 30
 
TEMPERATURE (DEGREES F)
MAX.....54    NORMAL.....61
MIN.....35    NORMAL.....42
MEAN....45    NORMAL.....52
DEPARTURE FROM 30-YEAR NORMAL............-7  
TOTAL DEPARTURE FOR THE MONTH...........+89 [+2.8 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............20  DEPARTURE........+6
TOTAL HEATING UNITS FOR THE MONTH...........474  DEPARTURE.......-88  
TOTAL HEATING UNITS FOR THE SEASON.........5611  DEPARTURE......-415  
TOTAL HEATING UNITS LAST SEASON TO DATE....5616  DIFFERENCE.......-5
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............29 WSW AT  1:59 P.M. 
                   AEROVANE.............28 WSW AT  1:59 P.M. 
                   ASOS.................29 W   AT  1:59 P.M.  
                   DAVIS................31 W   AT  1:59 P.M. 
FASTEST MILE FOR YESTERDAY..............18 WSW AT  2:00 P.M.*   
MAXIMUM 2-MINUTE ASOS AVERAGE...........20 W   AT 12:44 P.M.   
MAXIMUM 2-MINUTE DAVIS AVERAGE..........22 W   AT 12:44 P.M.   
                   AVERAGE............12.0 W 
                   ASOS...............11.3        
                   DAVIS..............12.7 W [275 deg]   
* last of several occurrences.
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00   DEPARTURE......-0.13  
                         ASOS..............0.00
TOTAL PRECIPITATION FOR APRIL..............3.16   DEPARTURE......-1.16
                         ASOS..............3.35 
TOTAL PRECIPITATION FOR THE YEAR..........20.76   DEPARTURE......+2.81
                         ASOS.............23.23 #
# Includes erroneous ASOS precipitation data on 2/13/08.
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M.........0.0    DEPARTURE......-0.1
TOTAL SNOWFALL FOR APRIL...................0.0    DEPARTURE......-3.1
TOTAL SNOWFALL FOR THE SEASON.............66.5    DEPARTURE......+6.4
 
PRELIMINARY CLIMATE SUMMARY FOR APRIL 2008 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane recording wind system when significant
TSTM: Thunderstorm day
....: Data not yet available, records not finalized
 
4/1  59/50/55/+14/0.20/0/000/00    54 S    Aero 58 MPH SSW
4/2  47/31/39/-3/0/0/745/97        52 W    Aero 51 MPH W
4/3  52/27/40/-2/0/0/648/84        37 SSW 
4/4  43/34/39/-3/0.71/0/000/00     35 E
4/5  51/37/44/+1/0.06/0/093/12     21 W
4/6  40/36/38/-5/0.09/0/000/00     36 NE 
4/7  39/34/37/-6/0/0/172/22        35 NE    Aero 36 MPH NE
4/8  47/30/39/-5/0/0/627/80        22 NE
4/9  59/33/47/+3/0/0/150/19        29 S    
4/10 71/44/58/+14/T/0/624/79       34 W
4/11 54/40/47/+2/0.03/096/13       24 SE 
4/12 70/43/57/+12/0.43/0/342/43    40 WNW   Aero 42 WNW
4/13 47/34/41/-4/T/0/104/13        30 NW 
4/14 53/30/42/-4/0/0/625/78        29 NW  
4/15 57/33/45/-1/0/0/803/100       23 SSE 
4/16 64/39/52/+6/0/0/806/100       24 SSE
4/17 64/14/53/+6/0/0/810/100       23 NE
4/18 70/42/56/+9/0/0/723/89        23 NW
4/19 70/46/58/+11/0/0/799/98       22 NE 
4/20 67/42/55/+7/0/0/760/93        25 ESE
4/21 61/41/51/+3/0/0/615/75        17 E
4/22 74/45/60/+11/0/0/789/96       23 S
4/23 83/50/67/+18/0/0/784/95       25 SW 
4/24 72/53/63/+14/0/0/802/97       38 WNW   Aero 39 WNW   
4/25 71/46/59/+9/0/0/557/67        25 E
4/26 55/42/49/-1/T/0/716/86        27 ENE 
4/27 49/40/45/-5/0.02/0/000/00     16 ESE 
4/28 57/39/48/-3/0.67/0/008/01     39 SE    Aero 39 SE
4/29 60/39/50/-1/0.95/0/008/01     44 WNW   Aero 44 WNW
4/30 54/35/45/-7/0/0/.../..        29 WSW
 
5/1 morning low temp. 35F; our normal low is now 42F
 
NEW DAILY RECORDS FOR APRIL 2008
None to date.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MAY 1
HIGH 87F IN 1899
LOW 29F IN 1978
PRECIP 2.53 INCHES IN 1921
SNOWFALL TRACE IN 1905,1917,1921,1995.
PEAK GUST 57 MPH NW IN 1974
 
RECORDS FOR MAY 2
HIGH 92F IN 2001
LOW 29F IN 1903
PRECIP 1.36 INCHES IN 2006
SNOWFALL 1.0 INS IN 1888
PEAK GUST 58 MPH S IN 1983
 
TODAY'S REPORT PREPARED By: Stephanie Radner