BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, SEPTEMBER 3, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME
 
CLEAR SKY AND VERY HAZY CONDITIONS CONTINUE 
WARM TEMPERATURES WITH MODERATE HUMIDITY TODAY
A LIGHT SEA BREEZE KEEPING US SLIGHTLY COOLER
 
A clear but hazy sky continues again today and
again temperatures are warmer than normal with
moderate humidity.  The high temp. has reached
85 degrees as compared to 89 yesterday, both well
above the normal upper 70's. 
 
Very hazy conditions have been occurring for
several days now and today is no exception with
visibility only 10 to 15 miles through early
in the afternoon.
 
BHO Warmest Augusts, deg F (1885-2015)
 
1) 72.6 in 2012
2) 72.5 in 1988
3) 72.4 in 2015
4) 72.3 in 2005
5) 72.1 in 2002
 
BHO Warmest August Average Maximum Temperature, deg F (1885-2015)
 
1) 83.2 in 2005
2) 83.1 in 1949
3) 82.6 in 2015
4) 82.5 in 1988
   82.5 in 2002
   82.5 in 2012
 
BHO Warmest August Average Minimum Temperature, deg F (1885-2015)
 
1) 64.9 in 2001
2) 64.6 in 2012
3) 64.4 in 2005
   64.4 in 2015
5) 64.3 in 2003
 
BHO Slowest August Wind Speed, mph (1885-2015)
 
1) 9.5 in 1996
   9.5 in 2008
3) 10.0 in 1899
   10.0 in 2009
   10.0 in 2012
   10.0 in 2015

BHO Sunniest Augusts, hours (1886-2015)

1) 303.7 in 1971  (74%)
2) 303.0 in 1969  (73%)
3) 299.1 in 2015  (72%)
4) 298.1 in 1932  (72%)
5) 296.7 in 1970  (72%)


PRELIMINARY STATS FOR AUGUST 2015

TEMPERATURE, Deg. F
Avg. Max. 82.6 [+3.4]
Avg. Min. 64.4 [+2.6]
Mean      73.5 [+3.0]
Corrected mean: 72.4
Max. for month: 92 on 18th
Min. for month: 58 on 8th, 10th, 28th

COOLING DEGREE DAYS
Total cooling units: 272 [+86]  
Total for the season: 537 [+129]
Total for last season: 479

PRECIPITATION, Inches
Total: 2.90 [-1.13]
Greatest in 24 hrs: 1.24, 15th-16th
 
WIND, mph
Avg. uncorrected wind speed: 9.3
Avg. corrected wind speed: 10.0
Prevailing wind direction: WNW @ 15%
Peak gust and direction: 39 W on the 4th [TSTM GUST]

SUNSHINE:
Campbell-Stokes card minutes: 17946 mins. of possible 24780 or 72%
Astronomical total minutes:   18654 mins. of possible 25773 or 72%
Long-term average for August is 58%
 
Today's Observations:
 
7 A.M.
Weather: Thin scattered cirrus, haze aloft
Temperature: 70F; Dew Point: 65F; Wind: NW at 8 kts,
Sea-level pressure: 29.87 ins. Hg, rising slightly
Visibility:  9 miles, hazy
6-hr Max temp: 70F
6-hr Min temp: 66F
24-hr precip: 0.00 ins
BHO SA 1155 250 -SCT 9 116/70/65/3208/987/ HZ ALF HAZY/
8/001 53006 10070 20066
 
10 A.M.
Weather: Clear, no clouds, haze aloft, sea breeze began
past hour
Temperature: 81F; Dew Point 66F; Wind: NNE at 6 kts,
Wind: Light
Sea-level pressure: 29.89 ins. Hg, rising slowly
Visibility: 10 miles, hazy 
BHO SA 1455 CLR 10 121/81/66/0306/989/ SKC  HZ ALF HAZY WND LGT
SEA BREEZE BEGAN PST HR/ 51005
 
1 P.M.
Weather: Clear, few cumulus WNW-N, haze aloft 
Temperature: 84F; Dew Point: 65F; Wind: E at 8 kts,
Wind: Direction variable NNE-E
Sea-level pressure: 29.87 ins. Hg, falling slightly, 
Visibility: 12 miles, hazy
BHO SA 1755 CLR 12 116/84/65/0808/987/ FEW CU WNW-N HZ ALF
HAZY WND 03V10/ 8/100 58005 10085 20070
 
SUMMARY FOR WEDNESDAY, SEPTEMBER 2, 2015
  
TEMPERATURE (DEGREES F)
MAX.....89   NORMAL.....76
MIN.....64   NORMAL.....59
MEAN....77   NORMAL.....68
 
DEPARTURE FROM 30-YEAR NORMAL........................+9
TOTAL DEPARTURE FOR THE MONTH.......................+14  [+6.8 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............12   DEPARTURE..........+8
TOTAL COOLING UNITS FOR THE MONTH..............20   DEPARTURE.........+12
TOTAL COOLING UNITS FOR THE SEASON............686   DEPARTURE........+141
TOTAL COOLING UNITS LAST SEASON TO DATE.......509   DIFFERENCE.......+177

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...................20   SW   AT    1:01 P.M.      
                   ASOS........................21   SW   AT    1:01 P.M.     
                   DAVIS.......................20  WSW   AT   12:59 P.M. RMY 21
FASTEST MILE FOR YESTERDAY.....................15   SW   AT    1:02 P.M.     
MAXIMUM 2-MINUTE ASOS AVERAGE..................16   SW   AT    1:04 P.M.        
MAXIMUM 2-MINUTE DAVIS AVERAGE.................16   SW   AT    1:03 P.M.      
AVERAGE WIND SPEED AND DIRECTION...............9.2 WSW 
                   ASOS.......................10.0
                   DAVIS...................... 8.6 WSW [240 deg.]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.00  DEPARTURE.....-0.11
                         ASOS...............0.00
TOTAL PRECIPITATION FOR THE MONTH...........0.00  DEPARTURE.....-0.22
                          ASOS..............0.00
TOTAL PRECIPITATION FOR THE YEAR...........30.26  DEPARTURE.....-4.98
                        ASOS...............N/A ***
*** ASOS annual total not available due to erroneous readings
 
PRELIMINARY CLIMATE SUMMARY FOR AUGUST & SEPTEMBER 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
 
8/1  88/68/78/+6/0.06/729/84               28 WNW RMY N/A
8/2  86/62/74/+2/0.00/865/100              24 SW  RMY N/A
8/3  89/68/79/+7/0.00/690/80               31 S   RMY N/A 
8/4  86/66/76/+4/0.31/422/49               45 W   RMY 50  TSTM 
8/5  84/64/74/+2/0.00/765/89               28 WNW RMY 27
8/6  80/59/70/-2/0.00/685/80               22 W   RMY 21
8/7  78/61/70/-2/0.00/845/99               20 ESE RMY 18
8/8  77/58/68/-4/0.00/741/87               18 E   RMY N/A
8/9  72/59/66/-6/T/458/54                  27 NNE RMY 26  
8/10 84/58/71/0/0.00/830/98                28 S   RMY N/A
8/11 70/63/67/-4/0.52/000/00               32 SSE RMY 35
8/12 83/65/74/+3/0.00/766/91               22 W   RMY 20
8/13 83/62/73/+2/0.00/832/99               18 WNW RMY 18
8/14 86/63/75/+4/0.00/837/100              21 S   RMY 23
8/15 91/66/79/+8/1.24/534/64               38 W   RMY 41  TSTM
8/16 87/65/76/+5/T/774/93                  16 W   RMY N/A TSTM
8/17 90/70/80/+9/0.00/805/97               17 W   RMY 18
8/18 92/70/91/+10/0.27/546/66              31 W   RMY 32  TSTM
8/19 87/69/78/+8/0.00/775/94               23 S   RMY 24
8/20 85/70/78/+8/0.00/723/88               22 ESE RMY 22
8/21 82/69/76/+6/0.31/98/12                21 S   RMY 23
8/22 73/66/70/0/T/98/12                    18 ENE RMY 16
8/23 70/66/68/-2/0.18/000/00               20 ENE RMY 18
8/24 78/67/73/+3/0.01/122/15               18 SSW RMY 19
8/25 85/68/77/+8/0.00/526/65               22 S   RMY 22
8/26 82/64/73/+4/0.00/629/78               21 NW  RMY 22
8/27 79/59/69/+0/0.00/.../..               22 W   RMY 23
8/28 80/58/69/+0/0.00/753/94               15 NW  RMY 15
8/29 81/60/70/+2/0.00/734/92               21 WSW RMY 21
8/30 86/65/76/+8/0.00/588/74               23 W   RMY 23
8/31 87/68/78/+10/0.00/705/89              26 W   RMY 28
 
9/1  81/65/73/+5/0.00/.../..               20 SSW RMY 20
9/2  89/64/77/+9/0.00/.../..               20 SW  RMY 21 
 
9/3  low since midnight is 66F; normal low is now 59F
 
DAILY RECORDS FOR AUGUST 2015
None so far.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR SEPTEMBER 3
HIGH 95F IN 1929
LOW 43F IN 1983
PRECIP 3.82 INCHES IN 1972 (TROPICAL STORM CARRIE)
PEAK GUST 58 MPH NNE IN 1972 (TROPICAL STORM CARRIE)
 
RECORDS FOR SEPTEMBER 4
HIGH 90F IN 1953, 1973
LOW 46F IN 1987
PRECIP 3.22 INCHES IN 1922
PEAK GUST 47 MPH SE IN 1966
 
TODAY'S REPORT PREPARED BY: Robert Skilling