Thursday, July 27, 2017
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JULY 27, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME
MOSTLY CLOUDY AND OVERCAST SKIES KEEP TEMPS COOL
The day started with broken altocumulus and overcast
altostratus clouds. A light rain shower passed between
7:50AM and 8:00AM EST. Skies cleared very slightly before
they became overcast again in the afternoon and brought
light rain. Precip. measured 0.02 in. at 1:00PM. Along
with the light rain, distant fog moved in to bring visi-
bility down to 30-40 miles.
Temperatures reached a max. of 72F around 11:00AM and had
fallen to 69F by 1:00PM. The average temp. for the day so
far is 66F which is 6F below normal. Humidity was also on
the rise with the arrival of rain and fog. Dew points were
in the mid-60s in the early afternoon, and humidity jumped
from 68% to 82% from the 10:00AM and 1:00PM observations.
The day felt slightly cooler and not so humid due to gusty
southwest winds.
Today’s Observations:
7 A.M.
Weather: Broken altocumulus, overcast altostratus
Temperature: 62F; Dew Point: 58F; Wind: SSW at 9 kts
Sea-level pressure: 30.05 ins. Hg, falling then rising
Visibility: 50 miles, distant fog in all directions
6-hr Max temp: 62F
6-hr Min temp: 59F
24-hr precip: 0.00 in.
BHO SA 1155 E120 BKN 210 OVC 50 177/62/58/2009/005/ DSNT FG ALQDS/
8/03/ 55004 10062 20059
10 A.M.
Weather: Two layers of broken altocumulus
Temperature: 69F; Dew Point: 58F; Wind: SW at 11G17 kts
Sea-level pressure: 30.01 ins. Hg, falling, then less quickly
Visibility: 60 miles
3-hr precip: Trace
BHO SA 1455 E110 BKN 210 BKN 60 164/69/58/2211G17/001/
8/030 56013 MANUAL 600//
1 P.M.
Weather: Light rain, overcast nimbostratus
Temperature: 69F; Dew Point: 63F; Wind: SW at 9G14 kts
Sea-level pressure: 29.97 ins. Hg, falling then steady
Visibility: 40 miles, except 30 miles W, distant fog in all directions
6-hr Max temp: 72F
6-hr Min temp: 61F
6-hr precip: 0.02 in.
BHO SA 1755 E110 OVC 40R- 148/69/63/2209G14/997/ VSBY W 30 DSNT FG ALQDS/
8/02/ 56016 MANUAL 6002/ ASOS 60002 10072 20061
SUMMARY FOR WEDNESDAY, JULY 26, 2017
TEMPERATURE (DEGREES F)
MAX…..79 NORMAL…..81
MIN…..55 NORMAL…..63
MEAN….67 NORMAL…..72
DEPARTURE FROM 30-YEAR NORMAL…………………….-5
TOTAL DEPARTURE FOR THE MONTH…………………….+8 [+0.1 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………2 DEPARTURE……….-6
TOTAL COOLING UNITS FOR THE MONTH………….202 DEPARTURE………+17
TOTAL COOLING UNITS FOR THE SEASON…………403 DEPARTURE………+89
TOTAL COOLING UNITS LAST SEASON TO DATE…….418 DEPARTURE………-15
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….21 S AT 8:40 P.M.*
AERO……………………22 SSE AT 7:08 P.M.
ASOS……………………22 S AT 8:40 P.M.
DAVIS…………………..20 S AT 8:02 P.M. RMY 23
FASTEST MILE FOR YESTERDAY…………………16 SSE AT 7:34 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………16 S AT 7:35 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..15 SSW AT 11:13 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..7.8 ESE
ASOS…………………..8.3
DAVIS………………….6.3 SSW [214 DEG.]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00 DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.35 DEPARTURE……+0.08
ASOS…………..3.36
TOTAL PRECIPITATION FOR THE YEAR……….34.72 DEPARTURE……+4.48
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/…/.. 26 W AERO 26 W RMY 27
7/22 87/70/79/+7/T/…/.. 20 WNW AERO 20 WNW RMY N/A
7/23 72/61/67/-5/T/…/.. 33 NE AERO 32 NE RMY 33
7/24 62/54/58/-14/1.74/…/.. 38 NE AERO 37 ENE RMY 38
7/25 63/54/59/-13/0.03/…/.. 23 NNE AERO 21 NNE RMY N/A
7/26 79/55/67/-5/0.00/…/.. 21 S* AERO 22 SSE RMY N/A
7/27 Low temp since midnight is 59F; normal low is now 63F
DAILY RECORDS FOR JULY
7/24/17: DAILY RECORD LOW MAXIMUM TEMPERATURE OF 62F,
TIES PREVIOUS RECORD SET IN 1904 AND TIED IN 1964
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR JULY 27
HIGH 95F IN 1949, 1963
LOW 50F IN 1920, 2001
PRE 4.01 INS IN 1979
WIND 47 MPH ENE IN 1984
RECORDS FOR JULY 28
HIGH 97F IN 1931
LOW 49F IN 1903
PRECIP 3.32 INS IN 1911
PEAK GUST 62 MPH SW IN 2006
TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle
