BLUE HILL METEOROLOGICAL OBSERVATORY 
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JULY 31, 2011  
ALL TIMES ARE IN EASTERN STANDARD TIME
 
MOSTLY CLEAR SKIES, WARM TEMPERATURES, AND LOW HUMIDITY AT SUMMIT TODAY
AS JULY 2011 IS ON VERGE OF FINISHING IN TOP 5 WARMEST JULYS (OR ANY MONTH)
ON RECORD AT BLUE HILL
 
High pressure system with northwesterly flow is still in place
continuing to provide mostly clear skies and lower humidity. Winds
continue to increase throughout the course of the day and dew points
have remained in the mid to upper 50s. The high temperature at the summit
is currently 85F with lower elevations seeing temperatures in the mid to
upper 80s. Humidity will be on the rise again tomorrow as a cold front will
make its way through in the afternoon providing a chance of showers and
thunderstorms.
 
July 2011 is on the verge of finishing in the top five warmest Julys
(or any month) on record at Blue Hill. If this is the case, four out of
the top five warmest months on record at Blue Hill will have occurred in
the past 17 years.
 
Below is the listing of our warmest Julys: 
Warmest July Corrected Mean Temperature (deg F)
(also warmest for all months of the year)
1) 75.1 in 2010
2) 74.9 in 1952
3) 74.1 in 1994
4) 73.8 in 1999
5) 73.5 in 1949
 
Today's observations:
 
7 A.M.  
Weather: Clear, few cumulus humilis S, few distant altocumulus/altocumulus
lenticularis SE-SW and N, few cirrus fibratus NNE-NE
Temperature: 69F, Dew point: 59F; Wind: NW at 6 kts
Sea-level pressure: 30.06 inches Hg, rising
Visibility: 60 miles
6-hour min. temp: 64F
BHO SA 1155 CLR 60 180/69/59/3106/006/ FEW SM CU S
FEW DSNT AC/ACSL SE-SW AND N FEW THN CI NNE-NE/ 8/141 52017 10069 20064
 
10 A.M.
Weather: Scattered cumulus congestus/mediocris/humilis/fractus
with cumulus forming all quadrants, thin scattered cirrus W-NNW
Temperature: 80F, Dew Point: 58F;  Wind: W at 11 kts
Wind: Direction variable SW-NW
Sea-level pressure: 30.05 inches Hg, falling
Visibility: 60 miles
BHO SA 1455 35 SCT 250 –SCT 60 176/80/58/2711/005/ CU FRMG ALQDS
WND 23V31/ 8/201 58004
 
1 P.M.
Weather: Scattered cumulus congestus/mediocris/humilis/fractus all
quadrants except NNE-E
Temperature: 85F, Dew Point: 59F;  Wind: NW at 10G14 kts
Wind: Direction variable W-NNW
Sea-level pressure: 30.01 inches Hg, falling
Visibility: 60 miles
6-hour max. temp: 85F
BHO SA 1755 60 SCT 60 164/85/59/3110G14/001/ CU ALQDS XCPT NNE-E
WND 26V34/ 8/200 58012 10085 20069
 
WEATHER SUMMARY FOR SATURDAY, JULY 30
 
TEMPERATURE (DEGREES F)
MAX.....86    NORMAL.....81
MIN.....68    NORMAL.....63
MEAN....77    NORMAL.....72
 
DEPARTURE FROM 30-YEAR NORMAL....................+5
TOTAL DEPARTURE FOR THE MONTH...................+82 [+2.5 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............25 NW  AT 12:14 P.M.
                   AEROVANE...............32 NW  AT 2:38 P.M. *
                   ASOS...................29 NW  AT 2:40 P.M.
                   DAVIS..................31 WNW AT 1:39 P.M.
THE FASTEST MILE FOR YESTERDAY............20 NW  AT 2:40 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE.............21 NW  AT 2:40 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE............23 WNW AT 12:05 P.M.
AVERAGE WIND SPEED AND DIRECTION........12.4 NW
                   ASOS.................12.3
                   DAVIS................13.1 W [280 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..........2.38  DEPARTURE.........-1.24
                         ASOS..............2.32
TOTAL PRECIPITATION FOR THE YEAR..........29.69  DEPARTURE.........+0.40
                        ASOS..............30.18**
**ASOS data is in error due to system failure on 1/12-13
 
PRELIMINARY CLIMATE SUMMARY FOR JULY 2011 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  78/59/69/-1/0.01/530/58         15 WNW 
7/2  80/61/71/+1/0.00/603/66         17 SE
7/3  79/64/72/+2/0.02/018/02         22 S
7/4  86/68/76/+6/0.00/583/64         18 SW
7/5  89/66/78/+7/0.00/784/86         15 S
7/6  88/68/78/+7/T/792/87            30 WNW AERO 35 MPH TSTM
7/7  86/67/77/+6/0.00/481/53         17 WNW
7/8  74/65/70/-1/0.47/027/03         16 ESE TSTM
7/9  81/63/72/+1/0.11/698/77         29 WNW  
7/10 83/59/71/0/0.00/860/95          21 SSW
7/11 89/65/77/+5/0.00/814/90         23 S
7/12 90/72/83/+9/0.00/777/86         25 W
7/13 85/61/73/+1/0.73/469/52         21 NE
7/14 70/58/64/-8/0.37/801/89         28 NNE TSTM 
7/15 79/59/69/-3/0.00/692/77         17 SSW TSTM 
7/16 85/61/73/+1/0.00/834/93         15 SW
7/17 88/67/78/+6/0.00/797/89         30 SSW
7/18 84/70/77/+5/0.02/188/21         38 WSW AERO 43 MPH
7/19 86/69/78/+6/0.00/777/87         18 WNW AERO 24 MPH
7/20 88/69/79/+7/0.00/766/86         29 SSW
7/21 93/68/81/+9/0.00/685/77         37 SSW AERO 43 MPH
7/22 99/76/88/+16/0.00/852/96        28 W   AERO 36 MPH
7/23 90/68/79/+7/0.05/469/53         25 WNW TSTM 
7/24 80/63/72/-1/0.03/274/31         20 NW  AERO 27 MPH
7/25 74/59/67/-6/0.34/123/14         16 ESE
7/26 80/61/71/-1/0.09/237/27         33 S   AERO 42 MPH
7/27 82/61/72/0/0.00/824/94          16 WSW
7/28 80/62/71/-1/0.00/.../..         17 S
7/29 77/63/70/-2/0.14/.../..         28 S AERO 35 MPH
7/30 86/68/77/+5/0.00/.../..         25 NW AERO 32 MPH
 
7/31 morning low 64F; normal low is 63F
 
DAILY RECORDS FOR JULY 2011
7/22 - RECORD HIGH MAXIMUM TEMPERATURE OF 99F;
ties the previous record of 99F set in 1926
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JULY 31
HIGH 95F IN 1917
LOW 50F IN 1895,1918
PRECIP 1.34 INCHES IN 1892
PEAK GUST 43e MPH WNW IN 1953, 43 SW IN 1971
 
RECORDS FOR AUGUST 1
HIGH 97F IN 1917
LOW 49F IN 1891
PRECIP 3.61 INCHES IN 1927
PEAK GUST 41 MPH NNW IN 1985
 
TODAY'S REPORT PREPARED BY: George A. Tabeek