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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, AUGUST 5, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

CLOUDY AND COOLER WITH LATE MORNING RAIN SHOWERS

One tenth inch of rain fell during a late morning rain shower today 
at Great Blue Hill. Skies have been overcast for most of the day, 
with a layer of overcast stratocumulus early on. Later in the 
morning and into the afternoon, there was broken and then scattered 
stratus with a now visible layer of overcast altostratus. The cloud 
cover has helped make today's temperatures stay lower. So far, a 
maximum of 74F was reached and the minimum of 67F occurred in the 
early morning. Yesterday's maximum temperature of 84F and minimum 
of 66F made the day's average temperature 3F above normal. The 
cumulative temperature departure for August is now +13 degrees, 
or +2.4 degrees per day.


PRELIMINARY STATS FOR JULY 2017

TEMPERATURE, Deg. F
Avg. Max. 79.8 [-1.0]
Avg. Min. 62.3 [-0.6]
Mean      71.1 [-0.8]
24-hour corrected mean: 70.2
Max. for month: 90F on  19th, 20th, and 21st
Min. for month: 54F on  24th and 25th

HEATING DEGREE DAYS
Total heating units: 24 [+15]
Total for the season: 24 [+15]
Total for last season: 10

COOLING DEGREE DAYS
Total cooling units: 220 [-2]
Total for the season: 421 [+70]
Total for last season: 474

PRECIPITATION, Inches
Total: 3.39 [-0.63]
Greatest in 24 hrs: 1.76 in on 24th-25th

WIND, mph
Avg. uncorrected wind speed: 9.4
Avg. corrected wind speed: 10.0
Prevailing wind direction: W at 13%
Peak gust and direction: 38 NE on 24th  

SUNSHINE:
Campbell-Stokes card minutes: 15,564 minutes of possible 26,268 or 58%
Astronomical total minutes: 16,175 minutes of possible 27,735 or 58%


Today's Observations:

7 A.M.
Weather: Overcast stratocumulus
Temperature: 70F; Dew Point: 66F; Wind: SSE at 8 kts
Sea-level pressure: 29.95 ins. Hg, falling , then less quickly
Visibility: 60 miles, except 30 miles SSW-N
6-hr Max temp: 70F
6-hr Min temp: 67F
24-hr precip: 0.00 in.
BHO SA 1155 E7 OVC 60 141/70/66/1608/995/ VSBY SSW-N 30/ 8/5// 56005 
10070 20067

10 A.M.
Weather: Rain, broken stratus, overcast altostratus
Temperature: 71F; Dew Point: 67F; Wind: SSW at 8 kts
Sea-level pressure: 29.95 ins. Hg, falling, then rising
Visibility: 15 miles, except 5 miles WSW-N
3-hr precip: 0.01 in.
BHO SA 1455 E25 BKN 84 OVC 15R 143/71/67/2008/995/ VSBY WSW-N 5/ 
8/72/ 53002 MANUAL 60001

1 P.M. 
Weather: Few stratus fractus in all directions, scattered stratus, 
overcast altostratus
Temperature: 74F; Dew Point: 67F; Wind: SSE at 12G19 kts
Sea-level pressure: 29.88 ins. Hg, falling, then more quickly
Visibility: 35 miles
6-hr Max temp: 74F 
6-hr Min temp: 69F
6-hr precip: 0.10 in.
BHO SA 1755 24 SCT E84 OVC 35 118/72/67/1612G19/988/ FEW STFRA ALQDS/ 
8/72/ 58025 MANUAL 60010 ASOS 60009 10074 20069


SUMMARY FOR FRIDAY, AUGUST 4, 2017
 
TEMPERATURE (DEGREES F)
MAX.....84   NORMAL.....81
MIN.....66   NORMAL.....63
MEAN....75   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL.........................+3
TOTAL DEPARTURE FOR THE MONTH........................+13 [+2.4 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............10   DEPARTURE..........+3
TOTAL COOLING UNITS FOR THE MONTH..............41   DEPARTURE.........+12
TOTAL COOLING UNITS FOR THE SEASON............462   DEPARTURE.........+82
TOTAL COOLING UNITS LAST SEASON TO DATE.......496   DEPARTURE.........-34

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................26 S   AT 4:08 P.M.
                   AERO........................30 S   AT 4:08 P.M.
                   ASOS........................29 SSW AT 4:08 P.M.
                   DAVIS.......................28 SSW AT 4:08 P.M. RMY 29
FASTEST MILE FOR YESTERDAY.....................22 S   AT 5:04 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................21 S   AT 6:43 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................18 S   AT 5:05 P.M.
AVERAGE WIND SPEED AND DIRECTION.............11.6 S
                   ASOS......................11.5
                   DAVIS......................9.3 S [185 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.15
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.09  DEPARTURE......+0.49
                         ASOS..............1.10
TOTAL PRECIPITATION FOR THE YEAR..........35.85  DEPARTURE......+4.26
                         ASOS...............N/A ***
*** ASOS annual total not available due to erroneous readings


PRELIMINARY CLIMATE SUMMARY FOR JULY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system 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
M:    Missing data

7/1  85/67/76/+6/T/439/48                  35 S   AERO 37 S   RMY 38
7/2  87/69/78/+8/T/785/86                  25 W*  AERO 28 W*  RMY 27
7/3  85/67/76/+5/0.00/894/98               28 W*  AERO 29 W   RMY 30
7/4  84/62/73/+2/0.00/783/86               17 W   AERO 17 W   RMY 18
7/5  82/62/72/+1/0.00/855/94               20 S   AERO 20 ENE RMY 20
7/6  82/60/71/+0/0.00/664/73               21 SSW AERO 22 SSW RMY 21
7/7  71/60/66/-5/0.63/000/00               28 ENE AERO 28 ENE RMY 27
7/8  84/61/73/+1/0.15/463/51               30 SW* AERO 32 SSW RMY 33  TSTM
7/9  81/60/71/-1/0.00/897/99               26 W   AERO 26 W   RMY 26
7/10 85/63/74/+2/T/751/83                  25 SW  AERO 25 S   RMY 26
7/11 82/66/74/+2/0.25/253/28               24 S   AERO 24 S   RMY N/A
7/12 85/68/77/+5/0.43/325/36               23 NE  AERO 22 NE  RMY 23  TSTM
7/13 68/55/62/-10/0.03/000/00              28 NNE AERO 28 NE  RMY 29
7/14 63/56/60/-12/0.02/000/00              15 E   AERO 14 E   RMY 14
7/15 80/60/70/-2/0.00/296/33               18 S   AERO 16 S   RMY 18
7/16 87/64/76/+4/0.00/852/95               18 SSE AERO 16 E   RMY 17
7/17 84/68/76/+4/0.00/680/76               25 S   AERO 25 S*  RMY 25
7/18 85/68/77/+5/0.07/500/56               23 S   AERO 23 S   RMY 23
7/19 90/70/80/+8/0.00/794/89               22 SW  AERO 22 SW* RMY 22
7/20 90/70/80/+8/0.00/623/70               21 WSW AERO 22 WSW RMY 21
7/21 90/68/79/+7/0.00/844/95               26 W   AERO 26 W   RMY 27
7/22 87/70/79/+7/T/266/30                  20 WNW AERO 20 WNW RMY N/A
7/23 72/61/67/-5/T/681/77                  33 NE  AERO 32 NE  RMY 33
7/24 62/54/58/-14/1.74/000/00              38 NE  AERO 37 ENE RMY 38
7/25 63/54/59/-13/0.03/203/23              23 NNE AERO 21 NNE RMY N/A
7/26 79/55/67/-5/0.00/703/80               21 S*  AERO 22 SSE RMY N/A
7/27 72/59/66/-6/0.04/044/05               21 SSW AERO 23 SW  RMY 22 
7/28 82/64/73/+1/0.00/674/77               16 W   AERO 17 N   RMY N/A
7/29 67/56/62/-10/0.00/166/19              30 NNE AERO 32 NNE RMY 33
7/30 76/55/66/-6/0.00/871/100              18 SSW*AERO 18 SSW RMY 19
7/31 85/60/73/+1/0.00/869/100              18 SSW AERO 20 SSW RMY 20


DAILY RECORDS FOR JULY

7/24/17: DAILY RECORD LOW MAXIMUM TEMPERATURE OF 62F,
         TIES PREVIOUS RECORD SET IN 1904 AND TIED IN 1964


PRELIMINARY CLIMATE SUMMARY FOR AUGUST CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system 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
M:    Missing data

8/1  87/65/76/+4/0.00/.../..               16 ESE*AERO 16 NNW RMY 16
8/2  86/65/76/+4/1.09/.../..               32 W   AERO 36 W   RMY 34 TSTM
8/3  83/65/74/+2/0.00/.../..               22 S   AERO 23 S   RMY 24
8/4  84/66/75/+3/0.00/.../..               26 S   AERO 30 S   RMY 29

8/5  Low temp since midnight is 67F; normal low is now 63F


DAILY RECORDS FOR AUGUST

None so far.


DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):      

RECORDS FOR AUGUST 5
HIGH 98F IN 1955
LOW 48F IN 1929,1972
PRECIP 3.03 INCHES IN 1893
PEAK GUST 60e MPH SW 1977

RECORDS FOR AUGUST 6
HIGH 95F IN 1931
LOW 48F IN 1934
PRECIP 1.47 INCHES IN 1995
PEAK GUST 44e MPH SSW IN 1940

TODAY'S REPORT PREPARED BY: Lizzy Suzedell