Sunday, June 18, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JUNE 18, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

HAZY, HOT, AND HUMID DAY ON TOP OF GREAT BLUE HILL

A brief rain shower passed BHO between 1:00AM and
2:00AM EST, and fog and drizzle lingered until late
morning.  Once the fog cleared, visibility was limited
to just 35 miles due to haze.  Temperatures had warmed
to 81F by 1:00PM, and dew points rose into the low 70s
creating very humid conditions.  Winds offered some minor
relief with gusts up to 35 MPH in the early afternoon.

Today’s Observations:

7 A.M.
Weather: Light drizzle, sky obscured due to fog
Temperature: 67F; Dew Point: 67F; Wind: S at 10 kts
Sea-level pressure: 29.93 ins. Hg, rising then falling
Visibility: 1/8 mile
6-hr Max temp: 67F
6-hr Min temp: 65F
24-hr precip: Trace
BHO SA 1155 W2 X 1/8L-F 137/67/67/1910/993/ PCPN VRY LGT/
8//// 58001 10067 20065

10 A.M.
Weather: Broken stratus
Temperature: 74F; Dew Point: 69F; Wind: SSW at 10G15 kts
Sea-level pressure: 29.93 ins. Hg, rising then falling
Visibility: 35 miles, distant fog in all directions
3-hr precip: Trace
BHO SA 1455 E8 BKN 35 135/74/69/2010G15/993/ DSNT FG ALQDS/
8/600 58002

1 P.M.
Weather: Broken cumulus
Temperature: 80F; Dew Point: 71F; Wind: S at 16G24 kts
Sea-level pressure: 29.88 ins. Hg, falling, then more quickly
Visibility: 35 miles, hazy
6-hr precip: Trace
6-hr Max temp: 81F
6-hr Min temp: 67F
BHO SA 1755 E20 BKN 35 118/80/71/1916G24/988/ HAZY/
8/100 58017 MANUAL 600// 10081 20067

SUMMARY FOR SATURDAY, JUNE 17, 2017

TEMPERATURE (DEGREES F)
MAX…..70   NORMAL…..76
MIN…..58   NORMAL…..58
MEAN….64   NORMAL…..67

DEPARTURE FROM 30-YEAR NORMAL…………………….-3
TOTAL DEPARTURE FOR THE MONTH…………………….+6 [+0.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………1   DEPARTURE……….-1
TOTAL HEATING UNITS FOR THE MONTH…………..62   DEPARTURE……….+4
TOTAL HEATING UNITS FOR THE SEASON………..5724   DEPARTURE……..-637
TOTAL HEATING UNITS LAST SEASON TO DATE……5282   DIFFERENCE…….+442

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE……….-4
TOTAL COOLING UNITS FOR THE MONTH…………..55   DEPARTURE………+11
TOTAL COOLING UNITS FOR THE SEASON…………111   DEPARTURE………+43
TOTAL COOLING UNITS LAST SEASON TO DATE……..84   DEPARTURE………+27

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….18  S  AT 10:16 P.M.
AERO……………………18  S  AT 10:49 P.M.
ASOS……………………20 SSW AT 11:03 P.M.
DAVIS…………………..18  S  AT 10:35 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………13  S  AT 11:51 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………15  S  AT 11:50 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..12  S  AT 11:15 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..5.1 NNE
ASOS…………………..5.8
DAVIS………………….4.0  E [101 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…Trace  DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….5.32  DEPARTURE……+2.60
ASOS…………..5.38
TOTAL PRECIPITATION FOR THE YEAR……….30.66  DEPARTURE……+5.28
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR JUNE 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

6/1  78/55/67/+5/0.06/706/78               39 NW  AERO 39 NW  RMY 41
6/2  70/50/60/-2/T/652/72                  32 WNW AERO 35 WNW RMY 34
6/3  66/47/57/-5/0.01/472/52               23 NW  AERO 25 NW  RMY 24
6/4  71/49/60/-3/0.28/490/54               21 SSE*AERO 21 SW  RMY N/A
6/5  55/49/52/-11/1.20/000/00              32 NE  AERO 35 NE  RMY N/A
6/6  49/45/47/-16/1.36/000/00              40 ENE AERO 43 ENE RMY 43
6/7  65/47/56/-8/0.05/519/57               21 NNE AERO 18 NE* RMY 20
6/8  76/52/64/0/0.00/602/66                21 SSE AERO 21 SSE RMY 18
6/9  78/53/66/+2/0.16/438/48               48 N   AERO 54 N   RMY 52 TSTM
6/10 83/59/71/+6/0.00/722/79               25 SSW AERO 28 SSW RMY 27
6/11 89/64/77/+12/0.00/704/77              29 SW  AERO 32 WSW RMY 30
6/12 94/69/82/+17/0.00/851/93              28 W   AERO 29 W   RMY 28
6/13 92/67/80/+15/0.03/…/..              25 W   AERO 28 WNW RMY 28
6/14 78/56/67/+1/0.02/…/..               20 S   AERO 20 S   RMY 20
6/15 75/54/65/-1/0.00/…/..               25 SSW AERO 29 S   RMY 30
6/16 70/56/63/-3/…./…/..               28 S   AERO 29 S   RMY N/A
6/17 70/58/64/-3/…./000/00               18 S   AERO 18 S   RMY N/A

6/18 Low temp since midnight is 65F; normal low is now 58F

DAILY RECORDS FOR JUNE

6/12/17: DAILY RECORD MAXIMUM TEMPERATURE OF 94F,
BREAKS PREVIOUS RECORD OF 92F SET IN 1973

6/12/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 69F,
TIES PREVIOUS RECORD SET IN 1942

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR JUNE 18
HIGH 93F IN 1929,1994
LOW 39F IN 1920
PRECIP 3.36 INS 1998
PEAK GUST 48e MPH W IN 1943

RECORDS FOR JUNE 19
HIGH 92F IN 1923
LOW 40F IN 1920
PRECIP 3.92 INS 1922
PEAK GUST 66e MPH NW IN 1940

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle