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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, AUGUST 22, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

HOT, HUMID, AND HAZY DAY

It has been very hot and humid at Great Blue Hill today,
with a maximum temperature of 87F reached so far. This 
is 8F above the average high temperature for August 22nd. 
Dew points have remained in the upper 60s to low 70s, and
as a result visibility has been very poor near 25 miles 
at its best this afternoon. Earlier this morning, fog limited 
visibility to just 2 miles at the 7:00 A.M. EST observation. 
By afternoon, the wind started to pick up, and a peak gust 
of 26 MPH out of the SSW was measured today at 12:53 P.M. 
The pressure has been falling for the past few hours, and 
as a cold front approaches, building cumulus suggest the 
showers and thunderstorms that may occur in the region 
later tonight.


Today's Observations:

7 A.M.
Weather: Sky obscurement due to fog
Temperature: 70F; Dew Point: 68F; Wind: S at 7 kts
Sea-level pressure: 30.03 ins. Hg, steady, then falling
Visibility: 2 miles, fog
6-hr Max temp: 70F
6-hr Min temp: 68F
24-hr precip: 0.00 in.
BHO SA 1155 W3 X 2F 170/70/68/1907/003/ 8//// 58001 10070 
20068

10 A.M.
Weather: Broken stratocumulus
Temperature: 78F; Dew Point: 71F; Wind: SSW at 9 kts
Sea-level pressure: 29.99 ins. Hg, falling unsteadily
Visibility: 15 miles, distant fog in all directions
BHO SA 1455 E12 BKN 15 156/78/71/2009/999/ DSNT FG ALQDS 
8/500 58014

1 P.M. 
Weather: Broken cumulus
Temperature: 86F; Dew Point: 70F; Wind: SSW at 14G23 kts
Sea-level pressure: 29.91 ins. Hg, falling, then more quickly
Visibility: 25 miles, hazy
6-hr Max temp: 87F 
6-hr Min temp: 70F
BHO SA 1755 E32 BKN 25 130/86/70/2014G23/991/ HAZY/ 8/100 
58026 10087 20070


SUMMARY FOR MONDAY, AUGUST 21, 2017
 
TEMPERATURE (DEGREES F)
MAX.....85   NORMAL.....79
MIN.....63   NORMAL.....61
MEAN....74   NORMAL.....70

DEPARTURE FROM 30-YEAR NORMAL.........................+4
TOTAL DEPARTURE FOR THE MONTH........................+25 [+1.0 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............9   DEPARTURE..........+3
TOTAL COOLING UNITS FOR THE MONTH.............156   DEPARTURE.........+18
TOTAL COOLING UNITS FOR THE SEASON............577   DEPARTURE.........+88
TOTAL COOLING UNITS LAST SEASON TO DATE.......703   DEPARTURE........-126

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................18 SW  AT  9:08 P.M.
                   AERO........................20 SW  AT 11:02 P.M.
                   ASOS........................20 SW  AT  9:18 P.M.
                   DAVIS.......................20 SSW AT 12:21 P.M. RMY 20
FASTEST MILE FOR YESTERDAY.....................16 W   AT  3:17 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................15 W   AT  3:18 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................14 W   AT 12:55 A.M.
AVERAGE WIND SPEED AND DIRECTION..............9.9 WSW
                   ASOS......................10.1
                   DAVIS......................8.6 WSW [255 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..........1.40  DEPARTURE......-1.48
                         ASOS..............1.38
TOTAL PRECIPITATION FOR THE YEAR..........36.16  DEPARTURE......+2.29
                         ASOS...............N/A ***
*** ASOS annual total not available due to erroneous readings


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/+4/0.00/762/88               16 ESE*AERO 16 NNW RMY 16
8/2  86/65/76/+4/1.09/372/43               32 W   AERO 36 W   RMY 34 TSTM
8/3  83/65/74/+2/0.00/552/64               22 S   AERO 23 S   RMY 24
8/4  84/66/75/+3/0.00/697/81               26 S   AERO 30 S   RMY 29
8/5  75/63/69/-3/0.10/060/07               23 NW  AERO 28 NW  RMY 29
8/6  76/57/67/-5/0.00/795/93               30 NW  AERO 32 NW  RMY 31
8/7  76/60/68/-4/0.01/597/70               28 SSW AERO 28 SSW RMY 29
8/8  74/60/67/-5/0.02/000/00               17 S   AERO 16 SSE RMY 16
8/9  83/58/71/-1/0.00/.../..               18 S   AERO 18 S   RMY 19 
8/10 86/63/75/+4/T/.../..                  20 S   AERO 18 S   RMY 20
8/11 82/63/73/+2/0.00/.../..               17 S   AERO 16 S   RMY 17
8/12 75/57/66/-5/0.17/.../..               22 SSW*AERO 22 SSW RMY 23
8/13 84/67/76/+5/0.00/.../..               26 WNW AERO 24 WNW RMY 26
8/14 82/67/75/+4/0.00/.../..               14 SSW*AERO 14 S   RMY 15
8/15 79/64/72/+1/T/.../..                  21 S   AERO 21 S   RMY 23
8/16 83/64/74/+3/0.00/.../..               23 NW* AERO 23 NW  RMY 25
8/17 81/58/70/-1/0.00/.../..               15 SSW AERO 14 SSW RMY N/A 
8/18 79/63/71/0/..../.../..                33 S   AERO 35 S   RMY 35
8/19 89/65/77/+7/0.00/.../..               23 WSW AERO 23 WSW RMY 25 
8/20 84/66/75/+5/0.00/.../..               23 NW  AERO 25 NW  RMY 27
8/21 85/63/74/+5/0.00/.../..               18 SW  AERO 20 SW  RMY 20

8/22 Low temp since midnight is 68F; normal low is now 61F


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 22
HIGH 90F IN 1939
LOW 42F IN 1894
PRECIP 2.28 INCHES IN 1935
PEAK GUST 44 MPH SSW IN 1987

RECORDS FOR AUGUST 23
HIGH 88F IN 1918, 1947, 1949, 1996
LOW 45F IN 1923
PRECIP 2.09 INCHES IN 2010
PEAK GUST 60e MPH NW IN 1940

TODAY'S REPORT PREPARED BY: Lizzy Suzedell