BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY MAY 9, 2010 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
COOL, BLUSTERY CONDITIONS TODAY....
 
After a warm start to the month of May, a cold front moved
through the region yesterday bringing cooler temperatures and
a total of 0.63 inches of rain, including several thunderstorms.
This was the most significant daily rainfall since April 9 when
1.12 inches fell. Additionally, yesterday's mean temperature of
54F equaled the normal, marking the first day at or below normal
this month.
 
Today, temperatures were well below normal and strong westerly
winds brought blustery conditions to the summit. As of 2:00 P.M.
EDT this afternoon, the maximum recorded temperature was 53F
while the peak gust was measured to be 46 MPH from the west-southwest.
According to ASOS, sustained winds have reached 35 MPH from the
west-south west. 
 
Today's observations:
 
7 A.M.
Weather: Scattered stratocumulus, scattered cirrus, few altocumulus
lenticularis SW-NE
Temperature: 41F, Dew point: 27F, Wind: WSW at 16G21 kts
Wind: Peak wind from WSW at 34 kts @ 6:49 a.m.
Wind: Direction variable SSW-NW
Sea-level pressure: 29.67 inches Hg, rising
Visibility: 40 miles  
6-hour minimum temp: 37F
24-hour precipitation: 0.36 inches
BHO 1155 40 SCT 140 SCT 250 SCT 40 046/41/27/2516G21/967/
FEW ACSL SW-NE PK WND 2534/49 WND 20V32 8/541 51020
ASOS 70035 MANUAL 70036 10043 20037
 
10 A.M.
Weather: Scattered cumulus, scattered cirrus,
patches of dense cirrus E-SW
Temperature: 46F, Dew point: 28F, Wind: W at 18G30 kts,
Wind: Peak wind from W at 40 kts @ 9:23 a.m.
Wind: Direction variable SSW-NW
Sea-level pressure: 29.70 inches Hg, rising
Visibility: 65 miles, NW 70 miles
BHO 1455 40 SCT 250 SCT 65 058/46/28/2618G30/970/ VSBY NW 70
PTCHS DENS CI E-SW PK WND 2640/23 WND 21V34 8/101 53012
 
1 P.M.
Weather: Broken stratocumulus, scattered cirrus
Temperature: 52F, Dew point: 29F, Wind: W at 24G31 kts,
Wind: Peak wind from W at 34 kts @ 12:07 p.m.
Wind: Direction variable SW-NNW
Sea-level pressure: 29.74 inches Hg, rising
Visibility: 65 miles, NW 70 miles
6-hourly max. temp: 53F
BHO 1755 50 BKN 250 SCT 70 070/52/29/2724G31/974/ VSBY NW 70
PK WND 2734/07 WND 23V33 8/501 51012 10053 20041
 

WEATHER SUMMARY FOR SATURDAY, MAY 8
 
TEMPERATURE (DEGREES F)
MAX.....63     NORMAL.....64
MIN.....45     NORMAL.....44
MEAN....54     NORMAL.....54
 
DEPARTURE FROM 30-YEAR AVERAGE.................0
TOTAL DEPARTURE FOR THE MONTH................+98 [+12.1 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............11   DEPARTURE.........0
TOTAL HEATING UNITS FOR THE MONTH............17   DEPARTURE.......-80
TOTAL HEATING UNITS FOR THE SEASON.........5499   DEPARTURE......-624
TOTAL HEATING UNITS LAST SEASON TO DATE....5961   DIFFERENCE.....-462
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............39 WSW  AT  11:06 P.M.
                   AEROVANE..............39 WSW  AT  11:05 P.M.
                   ASOS..................39 WSW  AT  11:06 P.M.      
                   DAVIS.................36 WNW  AT   4:28 P.M.         
THE FASTEST MILE FOR YESTERDAY...........28 WSW  AT  11:07 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............28 WSW  AT  11:07 P.M.       
MAXIMUM 2-MINUTE DAVIS AVERAGE...........26 WNW  AT   4:30 P.M.            
AVERAGE WIND SPEED AND DIRECTION........11.6 S
                   ASOS.................10.4
                   DAVIS.................9.9 SW [222 DEG] 
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M... 0.36  DEPARTURE......+0.24
                         ASOS..............0.35
TOTAL PRECIPITATION FOR THE MONTH..........0.76  DEPARTURE......-0.26
                         ASOS..............0.75
TOTAL PRECIPITATION FOR THE YEAR..........31.12  DEPARTURE.....+12.15
                         ASOS.............31.20
 
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..............64.4  DEPARTURE......+4.3
 
PRELIMINARY CLIMATE SUMMARY FOR MAY 2010 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
5/1  81/58/70/+18/0.00/0.0/684/81   29 SE
5/2  87/56/72/+20/0.00/0.0/432/51   29 SSW
5/3  80/62/71/+18/T/0.0/170/20      41 W     AERO 50 MPH W
5/4  81/52/67+14/0.09/0/562/66      51 WNW   AERO 58 MPH WNW TSTM
5/5  78/50/64/+11/0.00/0/845/99     28 S
5/6  76/54/65/+11/T/0/531/62        46 WNW   AERO 48 MPH WNW
5/7  72/47/60/+6/0.00/0/.../..      28 W
5/8  63/45/54/0/0.63/0/.../..       39 WSW   AERO 39 MPH WSW TSTM
 
5/9  our morning low temp: 37F; the normal low is now 45F
 
NEW DAILY RECORDS FOR MAY 2010
5/1 - minimum temp. of 58F equals record high
      minimum for the date set in 2001
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MAY 9
HIGH 93F IN 2000
LOW 31F IN 1947
PRECIP 2.72 INCHES IN 1954
SNOWFALL 5.0 INS IN 1977 (RECORD FOR MAY)
PEAK GUST 70e MPH NE IN 1977
 
RECORDS FOR MAY 10
HIGH 93F IN 1896
LOW 29F IN 1900
PRECIP 1.85 INS IN 1998
SNOW 2.8 INS IN 1977 (7.8 INS TOTAL 5/9-5/10 1977)
PEAK GUST 64 MPH S IN 1990

TODAY'S REPORT PREPARED BY: Eli Melaas