BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JULY 28, 2010 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
TEMPERATURES RISE TO HIGH 80'S AGAIN TODAY
THE AIR MASS HAS BECOME ONLY SLIGHTLY
MORE HUMID WITH DEW POINTS NEAR 60 TODAY  
 
Like yesterday our high temperature has reached
89F as of 2 p.m. EDT and four out of the past
five days have had highs of 89 degrees so we
just cannot seem to reach 90F to add another
day to the total of 10 days for month. If we
did reach 90 degrees later this afternoon we
would have 11 days for the month breaking the
current 3-way tie for 2nd place. Five days 
this month prior to today have had highs of 
89 degrees.
 
Greatest monthly number of 90-degree days, July
1) 14 in 1952
2) 10 in 1949
   10 in 1963
   10 in 2010 (through the 27th)
5)  9 in 1911 
6)  8 in 1983
    8 in 1988
 
Greatest monthly number of 90-degree days, all months
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 (through the 27th)
7)  9 in July, 1911
    9 in August, 1928
 
Warmest average maximum temperature (July 1st-27th)
 
1) 87.1 in 1952
2) 86.8 in 2010
3) 85.9 in 1911
4) 85.0 in 1994
5) 84.7 in 1955
6) 84.3 in 1949
   84.3 in 1983
 
Warmest average minimum temperature (July 1st-27th)
 
1) 66.5 in 2010
2) 65.6 in 1955
3) 65.1 in 1994
   65.1 in 2006
   65.1 in 2008
6) 64.7 in 1911
7) 64.4 in 1999
 
Today's observations: 
 
7 A.M.
Weather: Clear, altocumulus floccus/ few castellanus all quadrants,
few thin cirrus
Temperature: 73F, Dew point: 60F; Wind: SSW at 7 kts,
Sea-level pressure: 30.05 inches Hg, steady
Visibility: 30 miles, except 45 miles WNW, light haze
6-hour minimum temp: 67F
BHO SA 1155 CLR 30 176/73/60/2107/005/ AC/FEW ACC ALQDS FEW THN CI
VSBY WNW 45 LGT HZ ALQDS/ 8/081 50001 10073 20067
 
10 A.M.
Weather: Scattered cumulus, scattered cirrus, cumulus
forming all quadrants, cirrus distant SW-W 
Temperature: 85F, Dew point: 58F; Wind: SW at 11G22 kts,
Wind: Direction variability S thru W
Sea-level pressure: 30.01 inches Hg, falling
Visibility: 35 miles, distant haze
BHO SA 1455 50 SCT 250 SCT 35 164/85/58/2211G22/001/
CU FRMG ALQDS CI DSNT SW-W DSNT HZ WND 19V27/ 8/101 58012
 
1 P.M.
Weather: Scattered cumulus and moderate cumulus,
thin scattered cirrus
Temperature: 87F, Dew point: 60F; Wind: SSW at 19G25 kts,
Wind: Peak wind gust 27 kts from south at 12:33 p.m.  
Wind: Variable S-WSW 
Sea-level pressure: 29.98 inches Hg, falling
Visibility: 20 miles, 25 miles west-northwest,
hazy, haze increasing 
6-hour maximum temp: 89F
BHO SA 1755 65 SCT 300 –SCT 20 154/87/60/2019G25/998/ CU/MDT CU 
VSBY WNW 25 HAZY ALQDS HZ INCRSNG PK WND 1927/33/ WND 17V24/ 8/201
58010 10089 20073
 
WEATHER SUMMARY FOR TUESDAY, JULY 27
 
TEMPERATURE (DEGREES F)
MAX.....89     NORMAL.....82
MIN.....62     NORMAL.....63
MEAN....76     NORMAL.....72
 
DEPARTURE FROM 30-YEAR AVERAGE.................+4
TOTAL DEPARTURE FOR THE MONTH................+143 [+5.1 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............22 WNW AT  1:06 P.M. 
                   AEROVANE..............24 WNW AT 11:08 A.M.  
                   ASOS..................22 W   AT  3:51 P.M.  
                   DAVIS.................24 WNW AT 10:41 A.M.    
THE FASTEST MILE FOR YESTERDAY...........16 NW  AT  1:05 P.M  *  
MAXIMUM 2-MINUTE ASOS AVERAGE............16 WSW AT  3:31 P.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE.......... 18 W   AT 11:10 A.M. 
AVERAGE WIND SPEED AND DIRECTION.......10.6 W
                   ASOS................10.5
                   DAVIS...............10.3 W [265 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..........1.17  DEPARTURE........-2.09
                         ASOS..............1.13
TOTAL PRECIPITATION FOR THE YEAR..........37.26  DEPARTURE........+8.33
                         ASOS.............36.95 **
** 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/+11/0.00/772/85  18 SE
7/8  89/69/79/+8/0.00/835/92   23 S
7/9  90/71/81/+10/0.01/770/85  28 S
7/10 89/68/79/+8/0.01/371/41   30 W    TSTM
7/11 86/67/77/+5/T/750/83      20 ENE 
7/12 90/68/79/+7/0.00/677/75   32 SSW  AERO 33 MPH SSW
7/13 91/71/81/+9/0.05/423/47   25 S  
7/14 77/65/71/-1/0.33/000/00   21 NE
7/15 78/64/71/-1/T/449/50      18 ENE
7/16 90/65/78/+6/0.08/629/70   30 W    AERO 33 MPH WNW TSTM
7/17 91/71/81/+9/0.00/780/87   25 SW
7/18 90/71/81/+9/0.00/742/83   32 W
7/19 86/69/78/+6/0.04/482/54   30 S    AERO 35 MPH S
7/20 80/68/74/+2/0.00/330/37   16 S
7/21 88/68/78/+6/T/382/43      31 S    AERO 35 MPH S
7/22 84/66/75/+3/0.00/683/77   32 WNW  AERO 37 MPH WNW
7/23 79/65/72/0/0.62/000/00    25 SW
7/24 89/67/78/+5/0.03/362/41   21 WSW  TSTM
7/25 89/66/78/+5/T/458/52      30 WNW
7/26 83/60/72/0/0.00/879/100   36 WNW  AERO 38 MPH WNW
7/27 89/62/76/+4/0.00/877/100  22 WNW  
 
7/28 our morning low temp: 67F; the normal low is now 63F
 
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 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: Robert Skilling