BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JULY 25, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
MOSTLY SUNNY AND HUMID TODAY...
JULY NOW AMONG TOP TEN WETTEST ON RECORD...
Thin overcast cirrus has filtered the sunshine
for most of the day today.  The temperature has
yet to reach 80 as of early afternoon.  It has
been moderately humid with dew points in the 
low 60s and the wind is generally SW.  There was
only an additional trace of rainfall after 
2 PM EDT on Friday, so the final storm total
for the 7/23-24 rain event was 2.75 inches, and
the monthly total stands at 6.82 inches.  

Wettest July, 1886-2009 (inches)

1. 11.67 in 1938
2. 10.66 in 1988
3. 10.43 in 1921
4.  9.52 in 1915
5.  8.47 in 1889
6.  7.55 in 1916
7.  7.41 in 1898
8.  7.31 in 1989
9.  6.82 in 2009 *
10. 6.66 in 1959

* precipitation through 7:00 AM EDT on July 25

The peak gust for Friday, 7/24 of 46 mph NE at 
3:32 AM EST is a new record for the date, surpassing
the previous record of 43 mph S in 2008. 

Today's observations:

7 A.M.   
Weather: Thin overcast cirrus, few stratocumulus 
distant SE-SE, few stratus fractus, hazy
Temperature: 65F, Dew point: 62F, Wind: SW at 10 kts 
Sea-level pressure: 29.95 inches Hg, rising
Visibility: 35 miles, hazy
24-hour precipitation: 0.22 inches
6-hour minimum temp: 61F
BHO SA 1155 250 –OVC 35 141/65/62/2110/995/ SC DSNT SE-SW 
FEW STFRA HAZY/ 8/501 51014 70022 10065 20061

10 A.M. 
Weather: Scattered cirrus, thin overcast cirrus, few
cumulus SE-NNW, hazy
Temperature: 75F, Dew point: 63F, Wind: SW at 9 kts
Sea-level pressure: 29.97 inches Hg, rising
Visibility: 35 miles, hazy
BHO SA 1455 200 SCT 250 –OVC 35 150/75/63/2109/997/ FEW CU 
SE-NNW HAZY/ 8/101 52009

1 P.M.   
Weather: Thin scattered cirrus, few cumulus all quadrants,
hazy
Temperature: 80F, Dew point: 62F, Wind: SW at 10 kts
Wind: Direction variable SSW to W
Sea-level pressure: 29.96 inches Hg, falling
Visibility: 35 miles, hazy
6-hourly max. temp: 80F
BHO SA 1755 250 –OVC 35 144/80/62/2310/996/ FEW CU ALQDS 
HAZY WND 20V26/ 8/101 58006 10080 20065

WEATHER SUMMARY FOR FRIDAY, JULY 24

TEMPERATURE (DEGREES F)
MAX.....69    NORMAL.....82
MIN.....60    NORMAL.....63 
MEAN....65    NORMAL.....73

DEPARTURE FROM 30-YEAR AVERAGE..........-8
TOTAL DEPARTURE FOR THE MONTH.........-110  [-4.8 DEGREES/DAY]

HEATING DEGREE DATA WILL RESUME IN SEPTEMBER 

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............46 NE  AT  3:32 A.M.
                   AEROVANE..............45 NE  AT  3:32 A.M. 
                   ASOS..................46 ENE AT  2:53 A.M.      
                   DAVIS.................47 NE  AT  2:52 A.M.
FASTEST MILE FOR YESTERDAY...............33 NE  AT  2:51 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............30 ENE AT  3:39 A.M.   
MAXIMUM 2-MINUTE DAVIS AVERAGE...........31 NE  AT  2:54 A.M.
AVERAGE WIND SPEED AND DIRECTION........15.9 NW
                   ASOS.................15.2
                   DAVIS................15.2 N [002 DEG]
* last of several occurrences...

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.22  DEPARTURE....+0.10
                         ASOS..............0.24
TOTAL PRECIPITATION FOR THE MONTH..........6.82  DEPARTURE....+3.92
                         ASOS..............6.96
TOTAL PRECIPITATION FOR THE YEAR..........30.46  DEPARTURE....+1.89
                         ASOS.............31.61 

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/.../..       15 W
7/23 72/60/66/-6/0.68/.../..    35 NE
7/24 69/60/65/-8/2.07/.../..    46 NE    AERO 45 NE

7/25 our morning low temp: 61F; 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 25
HIGH 94F IN 1963,1987
LOW 51F IN 1901,1953
PRECIP 2.25 INCHES IN 1990
PEAK GUST 88 MPH NW IN 1972

RECORDS FOR JULY 26
HIGH 97F IN 1963
LOW 47F IN 1920
PRE 2.05 INS IN 1899
WIND 74e MPH NNW IN 1940

TODAY'S REPORT PREPARED BY: Mike Iacono