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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, AUGUST 3, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

EVENING STORMS BRING OVER AN INCH OF PRECIP.

Last evening's thunderstorms brought 1.09 inches of rain
to BHO with 0.60 inches falling between 5:00PM EST and
6:00PM EST according to ASOS.  The peak wind gust of 32 MPH
occurred at 5:06 PM out of the west, and the fastest mile
was 26 MPH at 5:05 PM out of the west.  Temperatures fell
from a max. of 86F before 1:00PM to 66F by 6:00PM.

Conditions are not as favorable for afternoon and evening
thunderstorms today.  No rain has been measured through
1:00PM.  Skies were mostly cloudy with cumulus by the after-
noon, and visibility had improved to 35 miles in all directions.
Humid conditions continue as dew points measured in the high 60s.  
   

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: Sky obscurement due to fog
Temperature: 67F; Dew Point: 66F; Wind: SSW at 6 kts,
Wind speed: Light
Sea-level pressure: 30.15 ins. Hg, rising, then more slowly
Visibility: 1/8 mile
6-hr Max temp: 67F
6-hr Min temp: 65F
24-hr precip: 1.09 in. 
BHO SA 1155 W2 X 1/8F 209/67/66/2006/015/ WND LGT/ 8//// 51010
MANUAL 70109 ASOS 70110 10067 20065

10 A.M.
Weather: Scattered cumulus, scattered cirrus
Temperature: 74F; Dew Point: 69F; Wind: S at 4 kts,
Wind speed: Light
Sea-level pressure: 30.16 ins. Hg, rising, then more slowly
Visibility: 20 miles, hazy
BHO SA 1455 24 SCT 250 SCT 20 215/74/69/1804/016/ HAZY/ 8/101 50006

1 P.M. 
Weather: Scattered cumulus
Temperature: 80F; Dew Point: 67F; Wind: S at 7 kts
Sea-level pressure: 30.13 ins. Hg, falling, then more quickly
Visibility: 35 miles, distant haze in all directions
6-hr Max temp: 81F 
6-hr Min temp: 67F
BHO SA 1755 31 SCT 35 204/80/67/1907/013/ DSNT HZ ALQDS/
8/100 58011 10081 20067


SUMMARY FOR WEDNESDAY, AUGUST 2, 2017
 
TEMPERATURE (DEGREES F)
MAX.....86   NORMAL.....81
MIN.....65   NORMAL.....63
MEAN....76   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL.........................+4
TOTAL DEPARTURE FOR THE MONTH.........................+8 [+3.8 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............11   DEPARTURE..........+4
TOTAL COOLING UNITS FOR THE MONTH..............22   DEPARTURE..........+8
TOTAL COOLING UNITS FOR THE SEASON............443   DEPARTURE.........+78
TOTAL COOLING UNITS LAST SEASON TO DATE.......481   DEPARTURE.........-38

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................32 W AT 5:06 P.M.
                   AERO........................36 W AT 5:05 P.M.
                   ASOS........................35 W AT 5:07 P.M.
                   DAVIS.......................33 W AT 5:05 P.M. RMY 34
FASTEST MILE FOR YESTERDAY.....................26 W AT 5:05 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................26 W AT 5:08 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................25 W AT 5:09 P.M.
AVERAGE WIND SPEED AND DIRECTION..............7.0 SSW
                   ASOS.......................7.2
                   DAVIS......................5.7 SSW [214 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....1.09  DEPARTURE......+0.94
                         ASOS..............1.10
TOTAL PRECIPITATION FOR THE MONTH..........1.09  DEPARTURE......+0.79
                         ASOS..............1.10
TOTAL PRECIPITATION FOR THE YEAR..........35.85  DEPARTURE......+4.56
                         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   RNY 34

8/3  Low temp since midnight is 65F; 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 3
HIGH 96F IN 1930
LOW 50F IN 1976
PRECIP 1.45 INCHES IN 1979
PEAK GUST 52 MPH NW IN 2008 [TSTM]

RECORDS FOR AUGUST 4
HIGH 95F IN 1928
LOW 48F IN 1900
PRECIP 1.68 INS IN 1983
PEAK GUST 48 MPH SW IN 1974

TODAY'S REPORT PREPARED BY: Cecilia Borries-Strigle