BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JULY 28, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
LAST DAYS OF JULY TO BRING SUMMER HEAT AND HUMIDITY
AND A SCATTERING OF SHOWERS AND THUNDERSTORMS
 
For the first time this summer we will have finally
put together three consecutive days of above
normal temperatures with today's average expected
to be well up in the 70's.  Yesterday morning's low
of 70F was the warmest morning minimum so far and
the low of 69F by midnight was the our warmest min-
imum of the summer and year to date.  The whole
month of June's high minimum was only 62F!   
The early afternoon maximum temperature had reached
85F today, just one degree short of the high for
the month to date.  The air is little less humid
with a dew point in the lower 60's. 
 
Today's observations:
 
7 A.M.  
Weather: Scattered lower cirrus, thin broken and thin overcast
higher cirrus 
Temperature: 70F, Dew point: 68F, Wind: SSW at 6 kts,
Sea-level pressure: 29.99 inches Hg, rising
Visibility: 5 miles in thin fog
24-hour precipitation: 0.00 inches
6-hour minimum temp: 67F
BHO SA 1155 220 SCT 250 –BKN 300 –OVC 5F 154/70/68/2006/999/
STRA DSSPTD BINOVC VSBY INCRSNG/ 8/001 51010 10070 20067 
 
10 A.M.
Weather: Thin broken cirrus, few lower cirrus, small cumulus
forming distant west 
Temperature: 79F, Dew point: 63F, Wind: SW at 5 kts
Sea-level pressure: 29.98 inches Hg, falling
Visibility: 25 miles, light haze
BHO SA 1455 250 –BKN 25 153/79/63/2205/998/
FEW SML CU FRMG DSNT W FEW LWR CI LGT HZ/
8/101 58001 
 
1 P.M.  
Weather: Scattered cumulus, modt. cumulus, scattered cirrus
Temperature: 84F, Dew point: 62F, Wind: S at 9 kts,
Wind: direction variability SSE tO SW 
Sea-level pressure: 29.96 inches Hg, falling
Visibility: 35 miles, NE-SE 25 miles, light haze
6-hourly max. temp: 85F
BHO SA 1755 55 SCT 250 SCT 35 144/84/62/1909/996/
MDT CU ALQDS VSBY NE-SE 25 LGT HZ ALQDS WND 16V23/
8/201 58009 10085 20070
 
WEATHER SUMMARY FOR MONDAY, JULY 27
 
TEMPERATURE (DEGREES F)
MAX.....83    NORMAL.....82
MIN.....69    NORMAL.....63
MEAN....76    NORMAL.....72
 
DEPARTURE FROM 30-YEAR AVERAGE..........+4
TOTAL DEPARTURE FOR THE MONTH.........-104  [-4.1 DEGREES/DAY]
 
HEATING DEGREE DATA WILL RESUME IN SEPTEMBER
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............30 S    AT   3:18 P.M. * 
                   AEROVANE..............30 SSW  AT   4:28 P.M. * 
                   ASOS..................30 SSE  AT   2:47 P.M.       
                   DAVIS.................32 SSW  AT   4:28 P.M. 
FASTEST MILE FOR YESTERDAY...............23 S    AT   4:43 P.M. *  
MAXIMUM 2-MINUTE ASOS AVERAGE............23 S    AT   4:30 P.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE...........24 SSW  AT   4:30 P.M.   
AVERAGE WIND SPEED AND DIRECTION.......12.9 S
                   ASOS................12.3
                   DAVIS...............12.1 S [180 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..........6.87  DEPARTURE....+3.61
                         ASOS..............7.01
TOTAL PRECIPITATION FOR THE YEAR..........30.51  DEPARTURE....+1.58
                         ASOS.............31.66
 
PRELIMINARY CLIMATE SUMMARY FOR JULY 2009 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  62/57/60/-10/0.51/000/00   25 NNE   TSTM
7/2  66/56/61/-9/1.00/000/00    29 SSW   TSTM
7/3  75/58/67/-3/T/283/31       23 WSW
7/4  77/59/68/-2/0/838/92       43 W      
7/5  78/54/66/-5/0/856/94       33 W     
7/6  79/60/70/-1/0/883/97       20 SSE
7/7  66/58/62/-9/0.73/027/03    28 SE    TSTM
7/8  67/56/62/-9/0.23/091/10    27 NNE   TSTM
7/9  66/55/61/-10/0/689/76      23 NE
7/10 76/54/65/-6/0/896/99       21 SW
7/11 77/56/67/-5/0.29/686/76    36 S
7/12 78/60/69/-3/0.33/650/72    30 SSW   TSTM
7/13 76/55/66/-6/0/802/89       32 SW 
7/14 75/56/66/-6/0/567/63       25 WNW
7/15 79/55/67/-5/0/826/92       30 WSW
7/16 77/62/70/-2/T/161/18       30 S
7/17 86/65/76/+4/0.01/582/65    24 ESE
7/18 84/66/75/+3/0.35/447/50    25 SSW   TSTM
7/19 80/62/71/-1/0/865/97       27 WSW
7/20 80/64/72/0/0/481/54        16 E
7/21 66/61/64/-8/0.62/000/00    29 NNE
7/22 77/61/69/-3/T/160/18       15 W
7/23 72/60/66/-6/0.68/195/22*   35 NE
7/24 69/60/65/-8/2.07/088/10*   46 NE    AERO 45 NE
7/25 83/61/72/-1/0/.../..       30 SSE
7/26 82/68/75/+3/0.05/.../..    32 S     
7/27 83/69/76/+4/0/588/67       30 S     TSTM (no rain)
 
7/28 our morning low temp: 67F; the normal low is now 63F
 
* sunshine minutes and percent changed:
  was 202 mins. and 23% on 23rd and 97 mins. and 11% on 24th 
 
NEW DAILY RECORDS FOR JULY 2009 TO DATE...
7/24: New record peak gust 46 MPH NE at 3:32 A.M.
      surpasses previous record of 43 MPH S IN 2008
 
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