BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JULY 12, 2010 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
JULY DROUGHT CONTINUES AS DOWNPOURS PASS JUST
NORTH AGAIN...TEMP REACHES 90F AGAIN TODAY
 
A thunderstorm with a brief downpour passed just 6 miles
to our north through the Jamaica Plain area of Boston at
12:30 PM EDT today but we did not get any precipitation on
Great Blue Hill, so we continue a long stretch with very
little measurable precipitation, just 0.02 inch so far
in the month of July.
 
The temperature has reached 90F again today, for the 6th
day (not consecutive) so far this month.  Yesterday's high
temperature reached 85.7F. 
 
Today's observations: 
 
7 A.M.
Weather: Clear, few stratocumulus northwest, dark
smoke layer north-northwest thru northeast, hazy
Temperature: 70F, Dew point: 69F; Wind: SSW at 3 kts
Wind: Light
Sea-level pressure: 29.93 inches Hg, rising
Visibility: 8 miles, hazy
6-hour minimum temp: 68F
BHO SA 1155 CLR 8 135/70/69/2103/993/ FEW SC NW
DRK K LYR NNW-NE WND LGT HAZY/ 8/500 51009 10070 20068
 
10 A.M.
Weather: Scattered cumulus, few moderate cumulus tops
forming all quadrants, hazy
Temperature: 85F, Dew point: 68F; Wind: SSW at 6 kts
Sea-level pressure: 29.95 inches Hg, rising  
Visibility: 10 miles, hazy
BHO SA 1455 40 SCT 10 142/85/68/2106/995/
FEW MDT CU FRMG ALQDS HAZY/ 8/200 53007
 
1 P.M.  
Weather: Scattered cumulus, scattered altocumulus,
overcast cirrostratus, few cumulus fractus, moderate
cumulus forming all quadrants, thin spots in overcast, hazy
Temperature: 88F, Dew point: 67F; Wind: SSW at 16G24 kts,
Wind: Direction variable SE-WSW
Sea-level pressure: 29.94 inches Hg, falling
Visibility: 10 miles, hazy
6-hour max. temp: 90F 
BHO SA 1755 55 SCT 10 SCT E220 OVC 10 139/88/67/2016G24/994/
FEW CUFRA MDT CU FRMG ALQDS THN SPTS IOVC ALQDS WND 13V24 HAZY/
8/237 58003 10090 20070
 
WEATHER SUMMARY FOR SUNDAY, JULY 11
 
TEMPERATURE (DEGREES F)
MAX.....86     NORMAL.....81
MIN.....67     NORMAL.....62
MEAN....77     NORMAL.....72
 
DEPARTURE FROM 30-YEAR AVERAGE.................+5
TOTAL DEPARTURE FOR THE MONTH.................+74 [+6.5 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............20 ENE AT  6:37 P.M. *
                   AEROVANE..............18  E  AT  7:21 P.M.
                   ASOS..................21 ENE AT  6:49 P.M. 
                   DAVIS.................20  N  AT  7:28 A.M.  
THE FASTEST MILE FOR YESTERDAY...........15 ENE AT  6:47 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE............15  E  AT  6:50 P.M.   
MAXIMUM 2-MINUTE DAVIS AVERAGE...........15 NE  AT  6:24 P.M. 
AVERAGE WIND SPEED AND DIRECTION........8.0 NNE
                   ASOS.................7.9
                   DAVIS................7.6 NNE [021 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..........0.02  DEPARTURE........-1.32
                         ASOS..............0.01
TOTAL PRECIPITATION FOR THE YEAR..........36.11  DEPARTURE........+9.10
                         ASOS.............35.83 **
** ASOS missing rainfall due to system failure on 6/24-25
 
PRELIMINARY CLIMATE SUMMARY FOR JULY 2010 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/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
 
7/1  74/53/64/-6/0.00/649/71   30 W   AERO 30 MPH W
7/2  80/54/67/-3/0.00/867/95   23 WNW
7/3  85/60/73/+3/0.00/821/90   20 SW
7/4  93/67/80/+10/0.00/492/54  31 W
7/5  94/70/82/+11/0.00/864/97  22 WNW
7/6  99/77/88/+17/0.00/746/82  25 NNW
7/7  91/73/82/+11/0.00/.../..  18 SE
7/8  89/69/79/+8/0.00/.../..   23 S
7/9  90/71/81/+10/0.01/.../..  28 S
7/10 89/68/79/+8/0.01/.../..   30 W    TSTM
7/11 86/67/77/+5/0/.../..      20 ENE  AERO 18 MPH E
 
7/12 morning low temperature was 68F; the normal low is 62F
 
NEW DAILY RECORDS FOR JULY 2010 TO DATE:
7/6 - Maximum temperature of 99 degrees F; surpasses 98F set in 1911.
7/6 - Minimum temperature of 77 degrees F; surpasses 73F set in 2003.
7/7 - Minimum temperature of 73 degrees F; surpasses 72F set in 1908.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JULY 12
HIGH 97F IN 1943
LOW 48F IN 1945
PRECIP 1.43 INS IN 1975
WIND 48e MPH SSW IN 1944
 
RECORDS FOR JULY 13
HIGH 95F IN 1894
LOW 52F IN 1888, 1895, 1939, 1973
PRECIP 3.54 INS IN 1996
WIND 55 MPH SE IN 1996
 
TODAY'S REPORT PREPARED BY: Stephanie Radner