BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JULY 28, 2013
ALL TIMES ARE IN EASTERN STANDARD TIME
 
MOSTLY CLOUDY WITH MORNING FOG AND DRIZZLE
 
It was a third consecutive foggy morning on the summit today, with the
visibility reduced to 1/16 of a mile at times.  It took longer for the fog
to lift this morning, as visibility did not increase much until mid-late
morning.  The sky has been mostly cloudy for the rest of the day with
occasional breaks of sunshine, especially early this afternoon.  Light rain
and drizzle last night and early this morning left only 0.03 inches of rain,
and our monthly total is now just under three inches.
 
The temperature has climbed slowly today due to the limited sunshine, rising
to 77F by early afternoon.  Despite the past three days being below average,
the month continues to run well above average by about 4 degrees per day.
The dew point has also been high, climbing to 70F by afternoon.  The wind has
been very light for most of the morning into early afternoon, averaging only
about 5mph out of the N-E with no gusts over 15 mph so far.
 
BHO Greatest Number of 90-Degree Days per Month, (1885-2013)
1) 14 in July 1952
2) 13 in August 2002
3) 10 in August 1944
   10 in July 1949
   10 in July 1963
   10 in July 2010
   10 in July 2013 (through 7/27)
8)  9 in July 1911
    9 in August 1928
10) 8 in August 1949
    8 in July 1963
    8 in July 1988
 
Today's Observations:
 
7 A.M.
Weather: Sky obscured by dense fog, very light drizzle, stratus drifting
over summit
Temperature: 67F; Dew Point: 67F; Wind: NNE at 8 kts
Sea-level pressure: 30.01 ins. Hg, falling then rising
Visibility: 1/16 mile, dense fog and very light drizzle
24-hr precip: 0.03 inch
6-hr precip (ASOS): 0.03 inch
6-hr min. temp: 66F
BHO SA 1155 W3 X 1/16 L-F 164/67/67/0308/001/ STRA DRFTNG OVR SMT
PCPN VRY LGT/ 8//// 53004 600// ASOS 60003 MANUAL 70003 ASOS 70003 
10067 20066
 
10 A.M.
Weather: Sky partially obscured by fog, overcast stratus, sun occasionally
dimly visible
Temperature: 71F; Dew Point: 68F; Wind: Estimated N at 4 kts,
Wind: Light and variable
Sea-level pressure: 30.03 ins. Hg, rising then falling
Visibility: 2 miles, except 1 mile NNE and 20 miles SW-NW, fog
6-hr precip: Trace
BHO SA 1455 E5 OVC –X 2F 168/71/68/E0104/003/ F2 SUN OCLY DMLY VSB
VSBY NNE 1 SW-NW 20 VSBY INCRSNG WND LGT AND VRB/ 50002 8/6// MANUAL 6000/
 
1 P.M.
Weather: Broken cumulus, broken cirrus and cirrus uncinus, few altocumulus
NE-S, dense cirrus NW-NE, few cirrocumulus
Temperature: 77F; Dew Point: 70F; Wind: ENE at 7 kts
Sea-level pressure: 30.01 ins. Hg, falling then falling more slowly
Visibility: 40 miles, except 25 miles NNW-NE, light distant haze
6-hr precip: Trace
6-hr max. temp: 77F
BHO SA 1755 E20 BKN 250 BKN 40 163/77/70/0707/001/ FEW AC NE-S DNS CI NW-NE
FEW CC VSBY NNW-NE 25 LGT DSNT HZ/ 8/174 56005 6000/ 10077 20067
 
WEATHER SUMMARY FOR SATURDAY, JULY 27, 2013
 
TEMPERATURE (DEGREES F)
MAX.....82     NORMAL.....81
MIN.....60     NORMAL.....63
MEAN....71     NORMAL.....72
 
DEPARTURE FROM 30-YEAR NORMAL.....................-1
TOTAL DEPARTURE FOR THE MONTH....................+112 [+4.0 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY................ 22 S   AT 5:07 P.M.
                   AERO..................... 22 S   AT 5:07 P.M.
                   ASOS..................... 23 S   AT 5:07 P.M.
                   DAVIS.................... 23 S   AT 5:06 P.M. RMY 23
FASTEST MILE FOR YESTERDAY.................. 17 S   AT 5:10 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............... 16 S   AT 7:44 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.............. 16 SSW AT 1:08 P.M.
AVERAGE WIND SPEED AND DIRECTION...........10.0 N
                   ASOS................... 9.4
                   DAVIS...................9.3  SW [216 deg.]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.03   DEPARTURE............-0.12
                         ASOS..............0.03
TOTAL PRECIPITATION FOR THE MONTH..........2.99   DEPARTURE............-0.43
                         ASOS..............2.95
TOTAL PRECIPITATION FOR THE YEAR..........35.19   DEPARTURE............+4.80
                         ASOS..............N/A*
*ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals 
     
PRELIMINARY CLIMATE SUMMARY FOR JULY 2013 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  82/69/76/+6/0.05/247/27         29 S   AERO 31 MPH SSW RMY 32
7/2  82/61/72/+2/T/100/11            23 SSW AERO 23 MPH SSW RMY 25
7/3  87/62/75/+4/T/556/61            28 SW  AERO 30 MPH SW  RMY 30
7/4  90/71/81/+10/0.00/811/89        25 WSW AERO 26 MPH SW  RMY 28
7/5  92/73/83/+12/0.00/874/96        24 W   AERO 25 MPH WSW RMY 25
7/6  90/73/82/+11/0.00/836/92        25 WNW AERO 25 MPH WNW RMY 26
7/7  91/72/82/+11/0.21/508/56        38 SSW AERO 43 MPH SSW RMY 44  TSTM
7/8  82/64/73/+1/0.04/617/68         18 NE  AERO 20 MPH NE  RMY 20  TSTM
7/9  72/63/68/-4/0.01/054/06         14 ENE AERO 14 MPH ENE RMY 14
7/10 84/65/75/+3/T/335/37            32 S   AERO 36 MPH S   RMY 35
7/11 79/69/74/+2/0.62/009/01         23 W   AERO 23 MPH W   RMY N/A TSTM
7/12 70/62/66/-6/0.00/162/18         29 NE  AERO 29 MPH NE  RMY 30
7/13 75/62/69/-3/0.08/009/01         21 ENE AERO 20 MPH ENE RMY N/A
7/14 89/71/80/+8/0.00/477/53         16 W   AERO 16 MPH W   RMY 16
7/15 91/72/82/+10/0.00/665/74        17 NW  AERO 16 MPH NW  RMY 18
7/16 91/71/81/+9/0.00/843/94         18 NNW AERO 16 MPH NNW RMY 16
7/17 93/74/84/+12/0.00/841/94        22 SW  AERO 23 MPH SW  RMY 25
7/18 90/75/83/+11/0.00/724/81        20 S   AERO 21 MPH S   RMY 22
7/19 95/76/86/+14/0.00/723/81        36 WSW AERO 38 MPH WSW RMY 38
7/20 93/72/82/+10/0.00/570/64        29 W   AERO 30 MPH W   RMY 31  TSTM
7/21 82/68/75/+3/0.00/568/64         16 NE  AERO 16 MPH NE  RMY 17
7/22 80/67/74/+2/T/514/58            17 NE  AERO 17 MPH NE  RMY 19  TSTM
7/23 82/68/75/+3/0.82/159/18         35 WSW AERO 36 MPH WSW RMY 39
7/24 84/64/74/+2/0.00/.../..         23 N   AERO 23 MPH N   RMY 23
7/25 64/57/61/-11/..../000/00        24 NNE AERO 24 MPH NNE RMY 25
7/26 67/59/63/-9/..../000/00         23 NNW AERO 23 MPH N   RMY 23
7/27 82/60/71/-1/0.00/.../..         22 S   AERO 23 MPH S   RMY 23
 
7/28 morning low temp: 65F; the normal low is now 63F
 
DAILY RECORDS FOR JULY 2013
7/14 - TIED DAILY RECORD HIGH MINIMUM TEMPERATURE OF 71F;
       ties previous record of 71F set in 1997
7/15 - NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 72F;
       surpasses previous record of 70F set in 1901, 1934, 1995
7/16 - TIED DAILY RECORD HIGH MINIMUM TEMPERATURE OF 71F;
       ties previous record of 71F set in 1901, 1958, 1968
7/17 - TIED DAILY RECORD HIGH MINIMUM TEMPERATURE OF 74F;
       ties previous record of 74F set in 1900
7/18 - NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 75F;
       surpasses previous record of 73F set in 1900, 1999
7/19 - NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 76F;
       surpasses previous record of 72F set in 1949, 1991, 2005
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JULY 28
HIGH 97F IN 1931
LOW 49F IN 1903
PRECIP 3.32 INCHES IN 1911
PEAK GUST 62 MPH SW IN 2006
 
RECORDS FOR JULY 29
HIGH 97F IN 1949
LOW 53F IN 1888,1914
PRECIP 1.53 INCHES IN 1901
PEAK GUST 40e MPH E IN 1941
 
TODAY'S REPORT PREPARED BY: Jonathan O'Brien, Matthew Magann, and Peter Volpe