Sunday, August 20, 2017
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, AUGUST 20, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME
ANOTHER DRY AND HOT AUGUST DAY
Yesterday’s maximum temperature was 89F which is 10 degrees above our
normal of 79F. Our high temperature so far today is 83F by 1:00 P.M.,
which is slightly above normal as well. Winds coming from the west/northwest
have been moderate and increasing all day. Air has been warm and dry with dew
points dropping since yesterday afternoon. With the lowering of dew points
we are also seeing lower humidity than yesterday morning’s 100%. It has
decreased down to 42% by 1:00 P.M. today. The morning was cloudless with
a few distant cumulus. Cloud cover increased to broken stratocumulus
throughout the afternoon and visibility remained consistent all day
at 70 miles.
Today’s Observations:
7 A.M.
Weather: Sky clear, few distant cumulus ENE-E amd W-WSW
Temperature: 70F; Dew Point: 61F; Wind: WNW at 9 kts
Sea-level pressure: 29.95 ins. Hg, rising, unsteadily
Visibility: 70 miles
6-hr Max temp: 72F
6-hr Min temp: 66F
24-hr precip: 0.00 in.
BHO SA 1155 CLR 70 142/70/61/2909/995/ FEW DSNT CU ENE-E AND W-WSW/
8/100 52022 10072 20066
10 A.M.
Weather: Sky clear, few distant cumulus WSW-N
Temperature: 79F; Dew Point: 60F; Wind: WNW at 11 kts
Sea-level pressure: 29.96 ins. Hg, rising, then less quickly
Visibility: 70 miles
BHO SA 1455 CLR 70 147/79/60/2911/996/ FEW DSNT CU WSW-N/ 8/100 53005
1 P.M.
Weather: Broken stratocumulus
Temperature: 82F; Dew Point: 57F; Wind: WNW at 12G18 kts
Sea-level pressure: 29.99 ins. Hg, rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 83F
6-hr Min temp: 70F
BHO SA 1755 E50 70 157/82/57/2912G18/999/ 8/100 53010 10083 20070
SUMMARY FOR SATURDAY, AUGUST 19, 2017
TEMPERATURE (DEGREES F)
MAX…..89 NORMAL…..79
MIN…..65 NORMAL…..62
MEAN….77 NORMAL…..70
DEPARTURE FROM 30-YEAR NORMAL…………………….+7
TOTAL DEPARTURE FOR THE MONTH……………………+16 [+0.6 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..12 DEPARTURE……….+1
TOTAL COOLING UNITS FOR THE MONTH………….137 DEPARTURE………+10
TOTAL COOLING UNITS FOR THE SEASON…………558 DEPARTURE………+80
TOTAL COOLING UNITS LAST SEASON TO DATE…….682 DEPARTURE……..-124
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….23 WSW AT 4:26 P.M.
AERO……………………23 WSW AT 4:23 P.M.
ASOS……………………25 W AT 4:25 P.M.
DAVIS…………………..23 W AT 3:00 P.M. RMY 25
FASTEST MILE FOR YESTERDAY…………………18 WSW AT 4:25 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………18 W AT 4:26 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..18 W AT 4:26 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..8.3 WSW
ASOS…………………..8.4
DAVIS………………….6.7 WSW [250 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……-1.22
ASOS…………..1.38
TOTAL PRECIPITATION FOR THE YEAR……….36.16 DEPARTURE……+2.55
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 Low temp since midnight is 66F; normal low is now 62F
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 20
HIGH 93F IN 1937
LOW 48F IN 1896, 1905, 1949
PRECIP 2.71 INCHES IN 1970
PEAK GUST 47 MPH W IN 1983
RECORDS FOR AUGUST 21
HIGH 92F IN 1937, 1995
LOW 47F IN 1982
PRECIP 2.84 INCHES IN 1888
PEAK GUST 54 MPH WSW IN 2004
TODAY’S REPORT PREPARED BY: Kaitlin Geagan
