Monday, August 20, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, AUGUST 20, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

ANOTHER DRY, FAIR WEATHER DAY WITH INCREASING VISIBILITY
AND DECREASING CLOUDS THROUGHOUT….

We observed an increase in visibility since this morning,
from 30 miles at 7 A.M. to 70 miles at 1 P.M. Wind remained
moderate and northeasterly throughout the day. We measured
0.01 inches of rain this morning. Temperatures stayed cool,
reaching a maximum so far of 72F. This is 7 degrees below
the daily normal of 79F. The low since midnight is 64F,
2 degrees above the normal minimum of 62F.

Today’s Observations:

7 A.M.
Weather: Overcast stratocumulus
Temperature: 64F; Dew Point: 62F; Wind: NNE at 9G16 kts
Sea-level pressure: 30.17 ins. Hg, rising steadily
Visibility: 30 miles, distant fog in all directions
6-hr Max temp: 64F
6-hr Min temp: 64F
24-hr Precip: 0.01 ins.
BHO SA 1155 E65 OVC 30 216/64/62/0309G16/017/ DSNT FG ALQDS/
8/1// 53019 MANUAL 70001 ASOS 70001 10064 20064

10 A.M.
Weather: Scattered cumulus, broken altocumulus
Temperature: 68F; Dew Point: 61F; Wind: NE at 12G20 kts
Sea-level pressure: 30.18 ins. Hg, falling then rising
Visibility: 30 miles, distant haze in all directions
3-hr Precip: 0.00 ins.
BHO SA 1455 18 SCT E75 BKN 30 221/68/61/0512G20/018/ DSNT HZ ALQDS/
8/160 50005

1 P.M.
Weather: Scattered cumulus, scattered cirrostratus
Temperature: 70F; Dew Point: 60F; Wind: NE at 13G22 kts
Sea-level pressure: 30.16 ins. Hg, falling steadily
Visibility: 70 miles
6-hr Max temp: 72F
6-hr Min temp: 64F
6-hr Precip: 0.00 ins.
BHO SA 1755 70 SCT 200 SCT 70 215/70/60/0513G22/016/ 8/205
56006 10072 20064

SUMMARY FOR SUNDAY, AUGUST 19, 2018

TEMPERATURE (DEGREES F)
MAX…..68   NORMAL…..79
MIN…..62   NORMAL…..62
MEAN….65   NORMAL…..70

DEPARTURE FROM 30-YEAR NORMAL…………………….-5
TOTAL DEPARTURE FOR THE MONTH……………………+83 [+4.2 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0  DEPARTURE……….-4
TOTAL COOLING UNITS FOR THE MONTH………….206  DEPARTURE………+79
TOTAL COOLING UNITS FOR THE SEASON…………661  DEPARTURE……..+183
TOTAL COOLING UNITS LAST SEASON TO DATE…….558  DEPARTURE……..+103

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY…………………30 NE  AT  8:40 A.M.
AERO……………………..30 NE  AT  8:40 A.M.
ASOS……………………..33 ENE AT  8:43 A.M.
DAVIS…………………….32 ENE AT  8:43 A.M. RMY 32
FASTEST MILE FOR YESTERDAY…………………..24 NE  AT  9:10 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………..22 ENE AT  9:16 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………….24 NE  AT  8:44 A.M.
AVERAGE WIND SPEED AND DIRECTION……………13.4 NE
ASOS……………………13.1
DAVIS…………………..13.5 NE [53 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.01  DEPARTURE……-0.12
ASOS…………..0.01
TOTAL PRECIPITATION FOR THE MONTH……….3.56  DEPARTURE……+0.94
ASOS…………..3.53
TOTAL PRECIPITATION FOR THE YEAR……….37.57  DEPARTURE……+4.24
ASOS………….39.11

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  82/66/74/+2/T/199/23           31 S   AERO 30 S   RMY 31
8/2  92/74/83/+11/0.00/761/88       30 SW  AERO 28 SW  RMY 31
8/3  88/74/81/+9/0.19/492/57        35 NW  AERO 32 NW  RMY 35 TSTM
8/4  82/69/76/+4/1.16/301/35        28 SW  AERO 25 SW  RMY 30 TSTM
8/5  89/66/78/+6/0.00/815/95        20 W   AERO 18 W   RMY 19
8/6  92/71/82/+10/0.00/822/96       20 W   AERO 16 WSW RMY N/A
8/7  92/73/83/+11/0.00/682/80       25 S   AERO 23 S   RMY 26
8/8  88/71/80/+8/0.70/…/..        25 SSW AERO 25 SSW RMY N/A TSTM
8/9  86/70/78/+6/0.07/…/..        29 SW  AERO 28 SW  RMY N/A TSTM
8/10 85/66/76/+5/T/…/..           17 NW  AERO 16 NW  RMY N/A
8/11 70/66/68/-3/…./…/..        18 SE  AERO 17 SE  RMY 18
8/12 73/66/70/-1/…./…/..        23 NNE AERO 18 NNE RMY 21
8/13 69/64/67/-4/0.17/…/..        23 ENE AERO 21 ENE RMY 21
8/14 83/69/76/+5/0.00/…/..        25 S   AERO 23 S   RMY 24
8/15 86/68/77/+6/0.00/…/..        20 W   AERO 17 W   RMY 19
8/16 87/70/79/+8/0.00/…/..        20 W   AERO 18 W   RMY 20
8/17 83/67/75/+4/…./…/..        23 SSW AERO 23 SSW RMY N/A
8/18 83/63/73/+2/…./…/..        31 NE  AERO 30 NE  RMY 33 TSTM
8/19 68/62/65/-5/…./…/..        30 NE  AERO 30 NE  RMY 32

8/20 Low temp since midnight is 64F; normal low is now 62F

DAILY RECORDS FOR AUGUST 2018

08/03/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 74F,
BREAKS PREVIOUS RECORD OF 71F SET IN 1928, 1969, AND 1979

08/07/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 73F,
BREAKS PREVIOUS RECORD OF 72F SET IN 1988

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: Benjamin Turner