BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JULY 27, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
WARM AND HUMID WEATHER PATTERN IN PLACE
TEMPERATURES HEADED ABOVE NORMAL
SHOWERS BRING ONLY 0.05 RAIN OVER WEEKEND
 
After a much delayed start, typical very warm
and humid summer weather is here at last.
The new weather pattern is expected to con-
tinue all week with temperatures reaching
the 80's by day and 66 to 72 degrees during
the overnights.
Yesterday's average temperature of 75F was
only the third day this month of July during
which we've recorded an above normal mean
temperature. The month continues to average
4.4 degrees cooler than normal. 
A thunderstorm occurred very early this morning
but without any rain.  Early Sunday morning a
period of light showers left only 0.05 inch
of rain however the month has a total of nearly 
7 inches and ranks in the top ten wettest Julys.  
 
Today's observations:
 
7 A.M.  
Weather: Overcast stratus
Temperature: 72F, Dew point: 70F, Wind: S at 9 kts,
Wind: direction variable SE to SSW 
Sea-level pressure: 29.96 inches Hg, rising
Visibility: 6 miles
24-hour precipitation: 0.00 inches
6-hour minimum temp: 70F
BHO SA 1155 E4 OVC 6F 145/72/70/1709/996/
HIER CLD OCNL VSB/ 8/6// 53010 10072 20070
 
10 A.M.
Weather: Scattered stratocumulus, few moderate tops,
scattered altocumulus, scattered cirrus  
Temperature: 80F, Dew point: 69F, Wind: S at 11G18 kts
Sea-level pressure: 29.95 inches Hg, falling
Visibility: 15 miles, 20 miles WNW hazy
BHO SA 1455 20 SCT 150 SCT 250 SCT 15 141/80/69/1812G18/995/
SC FEW MDT TOPS VSBY WNW 20 HAZY ALQDS/ 8/531 58004
 
1 P.M.  
Weather: Scattered cumulus, moderate cumulus and
a few towering cumulus 
Temperature: 82, Dew point: 66F, Wind: S at 16G23 kts,
Wind: direction variability SSE tO SSW 
Sea-level pressure: 29.94 inches Hg, falling
Visibility: 25 miles, hazy
6-hourly max. temp: 83F
BHO SA 1755 38 SCT 250 SCT 300 –BKN 25 139/82/66/1816G23/994/
MDT CU FEW TCU HAZY WND 15V21/ 8/201 58002 10083 20072 
 
WEATHER SUMMARY FOR SUNDAY, JULY 26
 
TEMPERATURE (DEGREES F)
MAX.....82    NORMAL.....82
MIN.....68    NORMAL.....63
MEAN....75    NORMAL.....72
 
DEPARTURE FROM 30-YEAR AVERAGE..........+3
TOTAL DEPARTURE FOR THE MONTH.........-108  [-4.4 DEGREES/DAY]
 
HEATING DEGREE DATA WILL RESUME IN SEPTEMBER
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............32 S    AT  12:48 P.M.
                   AEROVANE..............32 S    AT  12:48 P.M. 
                   ASOS..................32 S    AT  12:48 P.M.      
                   DAVIS.................32 SSW  AT  12:18 P.M.
FASTEST MILE FOR YESTERDAY...............24 S    AT  12:23 P.M.  
MAXIMUM 2-MINUTE ASOS AVERAGE............24 S    AT  12:49 P.M.   
MAXIMUM 2-MINUTE DAVIS AVERAGE...........24 S    AT  12:23 P.M. 
AVERAGE WIND SPEED AND DIRECTION.......15.4 S
                   ASOS................14.7
                   DAVIS...............13.1 S [170 DEG]
 
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....+3.73
                         ASOS..............7.01
TOTAL PRECIPITATION FOR THE YEAR..........30.51  DEPARTURE....+1.70
                         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/-6/0.68/204/23    35 NE
7/24 69/60/65/-8/2.07/097/11    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 our morning low temp: 70F; the normal low is now 63F
 
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 27
HIGH 95F IN 1949, 1963
LOW 50F IN 1920, 2001
PRE 4.01 INS IN 1979
WIND 47 MPH ENE IN 1984
 
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
 
TODAY'S REPORT PREPARED BY: Robert Skilling