BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, MAY 23, 2010 
ALL TIMES ARE IN EASTERN STANDARD TIME 
 
PARTLY SUNNY, HAZY AND CALM CONDITIONS TODAY....
 
A heavy layer of fog covered most of the summit early this
morning before giving way to partly sunny skies.
Temperatures climbed into the lower 70s by 2:00 PM EDT
this afternoon while dewpoints in the upper 50s
created hazy conditions. Winds have been light and
variable, averaging only 7 MPH for the day. 
 
Today's observations:
 
7 A.M.
Weather: Partial obscurement with heavy fog,
stratus drifting over summit, few stratocumulus
south through west
Temperature: 58F, Dew point: 56F, Wind: ENE at 3 kts
Wind: Gradually backing
Wind: Light and variable
Sea-level pressure: 30.33 inches Hg, rising
Visibility: 1/8 mile, fog, 5 miles to the southwest
6-hour precipitation: Trace
6-hour minimum temp: 55F 
BHO SA 1155 –X E2 OVC 1/8F 270/58/56/0703/033/ F8 STRA DRFTG 
OVR SMT FEW SC S-W VSBY SW 5 WND GRDLY BACKING PST HR WND LGT
AND VRB/ 8/6// 53016 MANUAL 6000/ 10058 20055
 
10 A.M.
Weather: Broken stratocumulus, few stratus fractus,
sun dimly visible, thin layer of fog distant north
through northeast
Temperature: 67F, Dew point: 60F, Wind: NNW at 1 kt
Wind: Light and variable
Sea-level pressure: 30.33 inches Hg, rising
Visibility: 25 miles, hazy
BHO SA 1455 E10 BKN 25 271/67/60/E3401/033/ FEW
STFRA SUN DMLY VSB THN LYR F DSNT N-NE HAZY WND
LGT AND VRB/ 8/600 53001
 
1 P.M.
Weather: Broken stratocumulus, broken cirrostratus
fibratus, moderate cumulus forming west-northwest
Temperature: 72F, Dew point: 60F, Wind: SSE at 5 kts
Wind: Light and variable
Sea-level pressure: 30.31 inches Hg, falling
Visibility: 20 miles, hazy
6-hourly max. temp: 73F
BHO SA 1755 E20 BKN 250 BKN 20 265/72/60/1505/031/ MDT CU 
FRMG WNW HAZY WND LGT AND VRB/ 8/201 58006 10073 20058
 
WEATHER SUMMARY FOR SATURDAY, MAY 22
 
TEMPERATURE (DEGREES F)
MAX.....76     NORMAL.....69
MIN.....52     NORMAL.....49
MEAN....64     NORMAL.....59
 
DEPARTURE FROM 30-YEAR AVERAGE................+5
TOTAL DEPARTURE FOR THE MONTH................+75 [+3.2 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............1   DEPARTURE........-6
TOTAL HEATING UNITS FOR THE MONTH...........153   DEPARTURE.......-66
TOTAL HEATING UNITS FOR THE SEASON.........5635   DEPARTURE......-610
TOTAL HEATING UNITS LAST SEASON TO DATE....6053   DIFFERENCE.....-418
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............23 SSE AT  5:03 P.M.
                   AEROVANE..............27 SSE AT  4:03 P.M.
                   ASOS..................24 SSE AT  8:55 P.M.
                   DAVIS.................23 SSE AT  5:03 P.M.
THE FASTEST MILE FOR YESTERDAY...........18 SSE AT  5:05 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE............18 SSE AT  5:10 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........16  SE AT  8:17 P.M.
AVERAGE WIND SPEED AND DIRECTION.......10.8  SE
                   ASOS.................9.9
                   DAVIS................9.2  SE [140 DEG]
* last of several occurrences
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...trace  DEPARTURE......-0.12
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........2.48  DEPARTURE......-0.22
                         ASOS..............2.46
TOTAL PRECIPITATION FOR THE YEAR..........32.84  DEPARTURE.....+12.19
                         ASOS.............32.91
 
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/+18/0.00/0/684/81     29 SE
5/2  87/56/72/+20/0.00/0/432/51     29 SSW
5/3  80/62/71/+18/0.04/0/170/20     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/+6/0.00/0/798/93      28 W
5/8  63/45/54/0/0.63/0/034/04       39 WSW   AERO 39 MPH WSW TSTM
5/9  53/37/45/-10/0.00/0/717/83     46 W     AERO 50 MPH W
5/10 57/35/46/-9/0.00/0/831/96      31 WNW   AERO 35 MPH WNW
5/11 57/34/46/-9/0.00/0/625/72      22 SSE  
5/12 50/41/46/-10/T/0/000/00        22 S
5/13 66/40/53/-3/0.00/0/776/89      24 WNW
5/14 71/48/60/+3/0.07/0/280/32      22 SW    TSTM
5/15 70/54/62/+5/T/0/832/95         37 WNW   AERO 40 MPH WNW
5/16 72/48/60/+3/0.00/0/889/99      30 WNW   AERO 35 MPH WNW
5/17 75/51/63/+6/0.00/0/739/84      20 SSE
5/18 63/45/54/-4/.../0/009/01       35 NE    AERO 37 MPH NE
5/19 52/45/49/-9/.../0/000/00       42 NE    AERO 45 MPH NE
5/20 80/50/65/+7/.../0/753/85       23 WSW
5/21 68/54/61/+2/0.00/0/.../..      24 NE
5/22 76/52/64/+5/0.00/0/.../..      23 SSE  
 
5/23 morning low temp: 55F; the normal low is 49F
 
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 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: Eli Melaas