BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JULY 11, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME
 
WARM, DRY WEATHER TODAY AFTER RECORD RAINS EARLY YESTERDAY
 
Heat has been building into the region today, with temperatures climbing
into the mid-80s this afternoon after a fairly cool morning low of 61F.
Bright sunshine has accompanied the warmth, with a few cumulus clouds only
enough to dot the Sun from time to time. Winds have been light today, from the
northwest most of the day but with an occasional on-shore component.
 
Contrary to yesterday, it has been a dry day at the summit today.  During the
overnight hours early yesterday morning, heavy rain and thunderstorms brought a
new daily record rainfall for 7/10, with a storm total of 2.03 inches.  A
little of this rain fell late on 7/9, so the exact record will be determined
in the coming days.  Numerous rainfall events in the past several weeks have
nearly erased our yearly precipitation deficit, now just over an inch. 
 
Today's Observations:

7 A.M.
Weather: Clear, altocumulus distant SE-SW, few cirrus NE
Temperature: 68F; Dew Point: 57F; Wind: NNW at 10 kts
Sea-level pressure: 30.06 ins. Hg, rising
Visibility: 50 miles, distant haze
6-hr Max temp: 68F
6-hr Min temp: 61F
24-hr precip: none
BHO SA 1155 CLR 50 178/68/57/3310/006/ AC DSNT SE-SW FEW CI NE DSNT HZ/
8/031 52020 10068 20061
 
10 A.M.
Weather: Clear, altocumulus distant SE-SW, few small cumulus distant
SSE and NW
Temperature: 79F; Dew Point: 58F; Wind: estimated WNW at 4 kts,
Wind: light
Sea-level pressure: 30.07 ins. Hg, rising slightly then steady
Visibility: 45 miles, distant haze
BHO SA 1455 CLR 45 183/79/58/E3004/007/ AC DSNT SE-SW
FEW SML CU DSNT SSE AND NW DSNT HZ WND LGT/ 8/130 51005
 
1 P.M.
Weather: Clear, few cumulus all quadrants, few thin cirrus S-SW
Temperature: 83F; Dew Point: 54F; Wind: NNW at 6 kts
Sea-level pressure: 30.05 ins. Hg, steady then falling slightly
Visibility: 50 miles, distant haze
6-hr Max temp: 84F
6-hr Min temp: 68F
BHO SA 1755 CLR 50 176/83/54/3406/005/ FEW CU ALQDS FEW THN CI S-SW DSNT HZ/
8/101 58007 10084 20068
 
SUMMARY FOR FRIDAY, JULY 10, 2015
  
TEMPERATURE (DEGREES F)
MAX.....80   NORMAL.....81
MIN.....59   NORMAL.....63
MEAN....70   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL........................-2
TOTAL DEPARTURE FOR THE MONTH........................+2 [+0.0 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............5   DEPARTURE..........-2
TOTAL COOLING UNITS FOR THE MONTH..............63   DEPARTURE..........-1
TOTAL COOLING UNITS FOR THE SEASON............201   DEPARTURE..........+8
TOTAL COOLING UNITS LAST SEASON TO DATE.......205   DIFFERENCE.........-4

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...................18  W   AT   3:06 P.M.               
                   ASOS........................18  NW  AT  10:43 P.M.
                   DAVIS.......................17  W   AT   3:06 P.M.  RMY 25
FASTEST MILE FOR YESTERDAY.....................12  NW  AT  10:41 P.M.         
MAXIMUM 2-MINUTE ASOS AVERAGE..................14  NW  AT  11:30 P.M.                
MAXIMUM 2-MINUTE DAVIS AVERAGE.................N/A        
AVERAGE WIND SPEED AND DIRECTION...............6.7 NW
                   ASOS........................7.9
                   DAVIS.......................5.4 NNW [338 deg.]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.00  DEPARTURE.....-0.13
                         ASOS...............0.00
TOTAL PRECIPITATION FOR THE MONTH...........2.64  DEPARTURE.....+1.52
                         ASOS...............2.69
TOTAL PRECIPITATION FOR THE YEAR.......... 26.91  DEPARTURE.....-1.05
                         ASOS...............N/A ***
*** ASOS annual totals not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR JULY CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY GUST
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
7/1  80/63/72/+2/0.59/.../..               30 SSE RMY 33  TSTM
7/2  78/60/69/-1/0.00/.../..               23 WNW RMY N/A
7/3  79/58/69/-2/0.00/.../..               17 SSW RMY 17
7/4  74/61/68/-3/T/.../..                  16 S   RMY N/A
7/5  82/58/70/-1/0.00/.../..               20 WSW RMY 20 
7/6  85/64/75/+4/0.00/.../..               20 S   RMY 21
7/7  84/65/75/+4/0.02/.../..               35 S   RMY 40
7/8  87/68/78/+6/T/.../..                  23 NE  RMY N/A
7/9  73/61/67/-5/..../.../..               24 NE  RMY 25
7/10 80/59/70/-2/..../.../..               18 W   RMY N/A TSTM
 
7/11 low since midnight is 61F; normal low is now 63F

DAILY RECORDS FOR JULY 2015
 
7/10- NEW RECORD DAILY PRECIPITATION PENDING OF X.XX in 2015
surpasses previous record of 1.68 in. in 1933

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JULY 11
HIGH 98F IN 1911
LOW 49F IN 1890
PRECIP 1.87 INS IN 1959
WIND 53 MPH NW IN 1988
 
RECORDS FOR JULY 12
HIGH 97F IN 1943
LOW 48F IN 1945
PRECIP 1.43 INS IN 1975
WIND 48e MPH SSW IN 1944
 
TODAY'S REPORT PREPARED BY: Jonathan O'Brien