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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JULY 21, 2012  
ALL TIMES ARE IN EASTERN STANDARD TIME

SUNNY AND WARM WITH MUCH DRIER CONDITIONS TODAY...

The only clouds today have been cirrus along the southern horizon
associated with a stationary front offshore to the south and a
few cumulus clouds. The sky has been mostly sunny all day with
dew point temperature in the much more comfortable range in the
low 50s. The dew point even dropped into the upper 40s for a time
this morning. Today's low temperature of 58 was the lowest
minimum since 55 on June 27th, and Friday's high of 70 was the
coolest maximum temperature since 68 on June 18th. The wind has
remained very light today out of the northeast through east with
a peak gust so far of only 17 mph NE at 1:10 PM EDT. 


Today's observations:
 
7 A.M. 
Weather: Scattered cirrus, few cumulus distant ESE-S, few
altocumulus NW, smoke layer along horizon S-N
Temperature: 65F; Dew Point: 58F; Relative Humidity: 77%
Wind: NE at 6 kts    
Sea-level pressure: 30.11 ins. Hg, steady then increasing  
Visibility: 65 miles 
6-hour min. temp: 58F 
BHO SA 1155 250 SCT 65 196/65/58/0506/011/ FEW CU DSNT ESE-S FEW AC 
NW K LYR ALG HRZN S-N WND LGT/ 8/131 53007 10065 20058

10 A.M. 
Weather: Scattered cirrus, few cumulus E-N, thin smoke layer
along horizon NE
Temperature: 72F; Dew Point: 48F; Relative Humidity: 42%
Wind: NE at 6 kts  
Sea-level pressure: 30.11 ins. Hg, increasing slightly 
Visibility: 75 miles
BHO SA 1455 250 SCT 75 197/72/48/0506/011/ FEW CU E-N THN K LYR ALG 
HRZN NE WND LGT AND VRB/ 8/101 53001
 
1 P.M.
Weather: Scattered cumulus, scattered cirrus, few lower dense
cirrus SE-S
Temperature: 76F; Dew Point: 54F; Relative Humidity: 46% 
Wind: ENE at 7 kts
Sea-level pressure: 30.11 ins. Hg, steady  
Visibility: 75 miles
6-hour max temp: 76F
BHO SA 1755 40 SCT 250 SCT 75 197/76/54/0607/011/ FEW LWR DNS CI 
SE-S WND 03V09/ 8/101 50000 10076 20065

WEATHER SUMMARY FOR FRIDAY, JULY 20

TEMPERATURE (DEGREES F)
MAX.....70    NORMAL.....81
MIN.....61    NORMAL.....63
MEAN....66    NORMAL.....72
 
DEPARTURE FROM 30-YEAR NORMAL.......................-6
TOTAL DEPARTURE FOR THE MONTH......................+89 [+4.3 DEGREES/DAY]

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY.............18 E   AT  9:04 A.M. *
                   AERO..................18 E   AT  7:28 A.M. *
                   ASOS..................20 ENE AT  7:23 A.M.
                   DAVIS.................18 NE  AT  7:23 A.M. RMY 19
THE FASTEST MILE FOR YESTERDAY...........12 E   AT  7:25 A.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE............13 ENE AT  7:23 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........12 ENE AT  7:24 A.M.
AVERAGE WIND SPEED AND DIRECTION........8.3 E
                   ASOS.................7.6
                   DAVIS................6.5 E [080 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 THE MONTH..........1.83   DEPARTURE...........-0.63
                         ASOS..............1.84
TOTAL PRECIPITATION FOR THE YEAR..........19.52   DEPARTURE...........-9.91
                         ASOS.............19.46

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 morning low temp: 58F; 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 21
HIGH 100F IN 1977 [RECORD FOR MONTH]
LOW 48F IN 1890
PRECIP 2.09 INCHES IN 1938
PEAK GUST 60e MPH WNW IN 1977

RECORDS FOR JULY 22
HIGH 99F IN 1926, 2011
LOW 52F IN 1890
PRECIP 1.73 INCHES IN 1900 
PEAK GUST 55 MPH IN 1983

TODAY'S REPORT PREPARED BY: Mike Iacono, William Wilson, Joey McNamara