BLUE HILL METEOROLOGICAL OBSERVATORY 
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JULY 23, 2012  
ALL TIMES ARE IN EASTERN STANDARD TIME

WARM AND HUMID AIR ARRIVES WITH BRIEF SHOWERS EARLY 

Very warm and humid air has returned today and its arrival 
was accompanied by a light shower early this morning 
with just 0.02 inch of rainfall.  Temperatures have 
reached the mid-80's with dew points up to the mid to 
upper 60's early this afternoon. 
 
Today's observations:
 
7 A.M. 
Weather: Overcast altocumulus, altocumulus castellanus, large break
in overcast SE-S, higher dense cirrus visible during past hour
Temperature: 66F; Dew Point: 64F; Relative Humidity: 92%
Wind: S at 8 kts    
Sea-level pressure: 30.08 ins. Hg, falling  
Visibility: 30 miles, except 35 miles south
6-hour precip: 0.02 inch
6-hour min. temp: 63F 
BHO SA 1155 E95 OVC 30 186/66/64/1808/008/ ACC ALQDS LGE BINOVC SE-S
HIER DNS CI VSB PST HR VSBY S 35 DSNT THN F ALQDS F/ 8/082 58005
ASOS 60002 MANUAL 6002/ 1066 20063

10 A.M. 
Weather: Scattered altocumulus, broken altocumulus, altocumulus
castellanus overhead, cumulus forming except overhead through NE-E, 
dark distant WSW, breaks in overcast and thin spots in overcast
overhead-SE-S 
Temperature: 77F; Dew Point: 67F; Relative Humidity: 73%
Wind: S at 10 kts  
Sea-level pressure: 30.03 ins. Hg, falling then more rapidly 
Visibility: 20 miles, except 35 miles south, hazy and 
haze increasing 
BHO SA 1455 80 SCT E130 BKN 250 OVC 20 170/77/67/1910/003/ CUFRA/CU
FRMG XCPT OVHD-NE-E ACC OVHD DRK DSNT WSW BINOVC/THN SPTS IOVC OVHD
AND SE-S SUN DMLY VSB VSBY S 35 HAZY ALQDS HZ INCRSNG/ 8/181 58016
 
1 P.M.
Weather: Scattered altocumulus, [2 levels], scattered dense cirrus,
thin broken cirrus, thin overcast cirrus, cumulus fractus,
cumulus, few moderate cumulus all quadrants    
Temperature: 79F; Dew Point: 68F; Relative Humidity: 69% 
Wind: SSW at 11 kts
Sea-level pressure: 29.98 ins. Hg, falling, then more slowly 
Visibility: 15 miles, except 20 miles WNW, hazy and 
haze increasing   
6-hour max temp: 79F
BHO SA 1755 80 SCT 130 SCT 220 SCT 250 -BKN 300 –OVC 15
153/79/68/2011/998/ CUFRA/CU/FEW MDT CU ALQDS DNS CI ALQDS VSBY WNW
20 HAZY HZ INCRSNG/ 8/272 56017 10079 20066 

WEATHER SUMMARY FOR SUNDAY, JULY 22

TEMPERATURE (DEGREES F)
MAX.....84    NORMAL.....81
MIN.....59    NORMAL.....63
MEAN....72    NORMAL.....72
 
DEPARTURE FROM 30-YEAR NORMAL.......................0
TOTAL DEPARTURE FOR THE MONTH.....................+85 [+3.7 DEGREES/DAY]

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY.............24 S   AT 4:41 P.M.
                   AERO..................21 S   AT 4:39 P.M.
                   ASOS..................25 S   AT 4:42 P.M.
                   DAVIS.................25 S   AT 4:24 P.M. RMY 27
THE FASTEST MILE FOR YESTERDAY...........19 S   AT 4:48 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE............20 S   AT 4:43 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........20 S   AT 4:43 P.M.
AVERAGE WIND SPEED AND DIRECTION........11.4 S
                   ASOS.................11.4
                   DAVIS................10.4 SSW [210 deg]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M... 0.02   DEPARTURE...........-0.11
                         ASOS..............0.02
TOTAL PRECIPITATION FOR THE MONTH..........1.85   DEPARTURE...........-0.87
                         ASOS..............1.86
TOTAL PRECIPITATION FOR THE YEAR..........19.54   DEPARTURE..........-10.15
                         ASOS.............19.48

PRELIMINARY CLIMATE SUMMARY FOR JULY 2012 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust
RMY:  RMY = R.M. Young wind gust recording system added 8/9/2011
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized

7/1  89/67/78/+8/0.01/676/74        33 WSW AERO 32 MPH WSW RMY 34 TSTM
7/2  84/66/75/+5/T/644/71           23 W   AERO 22 MPH W   RMY 23
7/3  85/63/74/+3/0.00/787/86        23 W   AERO 21 MPH W   RMY 20
7/4  85/66/76/+5/0.37/480/53        20 W   AERO 20 MPH W   RMY 23 TSTM
7/5  81/68/75/+4/0.00/729/80        23 NW  AERO 23 MPH NW  RMY 22
7/6  86/64/75/+4/0.00/753/83        18 SSW AERO 18 MPH SSW RMY 19
7/7  81/69/75/+4/T/224/25           23 W   AERO 23 MPH W   RMY 24
7/8  87/66/77/+5/0.00/814/90        23 W   AERO 23 MPH W   RMY 25
7/9  82/61/72/0/0.00/738/85         22 W   AERO 21 MPH W   RMY 23
7/10 83/61/72/0/0.00/852/98         18 W   AERO 18 MPH W   RMY 18
7/11 84/64/74/+2/0.00/768/88        21 W   AERO 21 MPH W   RMY 23
7/12 89/64/77/+5/0.00/875/97        25 SSW AERO 25 MPH SSW RMY 26
7/13 89/66/78/+6/0.00/604/67        28 S   AERO 27 MPH S   RMY 29
7/14 90/69/80/+8/0.00/521/58        24 W   AERO 22 MPH W   RMY 23
7/15 91/68/80/+8/T/539/60           18 SW  AERO 18 MPH SSW RMY 20
7/16 91/70/81/+9/T/771/86           23 NW  AERO 23 MPH NW  RMY 24
7/17 95/71/83/+11/0.00/831/93       33 SSW AERO 33 MPH SSW RMY 35
7/18 91/69/80/+8/1.45/.../..        40 NE  AERO 39 MPH NE  RMY 41 TSTM
7/19 81/63/72/0/0.00/.../..         21 NNW AERO 18 MPH NNW RMY 18
7/20 70/61/66/-6/0.00/.../..        18 E   AERO 18 MPH E   RMY 19
7/21 77/58/68/-4/0.00/.../..        20 ENE AERO 20 MPH SSE RMY 19
7/22 84/59/72/0/0.00/.../..	    24 S   AERO 24 MPH S   RMY 27

7/23 morning low temp: 63F; the normal low is now 63F

DAILY RECORDS FOR JULY 2012
None so far.

DAILY EXTREMES 
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR JULY 23
HIGH 99F IN 1952
LOW 51F IN 1923,1977
PRECIP 1.82 INCHES IN 1953
PEAK GUST 54e MPH S IN 1946

RECORDS FOR JULY 24
HIGH 96F IN 1987
LOW 49F IN 1893,1912
PRECIP 2.27 INCHES IN 2008
PEAK GUST 46 MPH NE IN 2009

TODAY'S REPORT PREPARED BY: Robert Skilling/Patrick Peters
 
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