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Wednesday, July 20, 2016

July 20, 2016

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, JULY…

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JULY 20, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

BEAUTIFUL DAY WITH MOSTLY CLEAR SKIES AND LOW DEW POINTS

Dew points dropped to the high 40s today, while yesterday’s wind shift to
the NW brought better visibility in the 70-80 mile range.  Skies were mostly
clear during the morning observations.  Fair weather cumulus began forming
in the early afternoon.  Temperatures were seasonable reaching a peak of 82F
by the 1:00PM observation.  The overnight low of 59F was 4F below the
average of 63F.

Today’s Observations:

7 A.M.
Weather: Scattered cirrus
Temperature: 66F; Dew Point: 52F; Wind: estimated NW at 5 kts,
Wind Speed: Light
Sea-level pressure: 30.22 ins. Hg, rising, then more quickly
Visibility: 80 miles
6-hr Max temp: 66F
6-hr Min temp: 59F
24-hr precip: 0.00 in.
BHO SA 1155 250 SCT 80 232/66/52/E3105/022/ WND LGT/ 8/002 53013 10066 20059

10 A.M.
Weather: Few cumulus in all directions, scattered cirrus
Temperature: 75F; Dew Point: 54F; Wind: WNW at 8 kts
Sea-level pressure: 30.22 ins. Hg, rising, then falling
Visibility: 70 miles
BHO SA 1455 250 SCT 70 232/75/46/2908/022/ FEW CU ALQDS/ 8/102 58000

1 P.M.
Weather: Scattered cumulus
Temperature: 82F; Dew Point: 47F; Wind: W at 8G16 kts
Sea-level pressure: 30.16 ins. Hg, falling, then more slowly
Visibility: 70 miles
6-hr Max temp: 82F
6-hr Min temp: 66F
BHO SA 1755 64 SCT 70 215/82/47/2808G16/016/ 8/100 56017 10082 20066

SUMMARY FOR TUESDAY, JULY 19, 2016

TEMPERATURE (DEGREES F)
MAX…..85   NORMAL…..81
MIN…..63   NORMAL…..63
MEAN….74   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL……………………+2
TOTAL DEPARTURE FOR THE MONTH…………………..+26 [+1.2 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………9   DEPARTURE……….+1
TOTAL COOLING UNITS FOR THE MONTH………….160   DEPARTURE………+30
TOTAL COOLING UNITS FOR THE SEASON…………317   DEPARTURE………+58
TOTAL COOLING UNITS LAST SEASON TO DATE…….268   DIFFERENCE……..+49

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….28 NW   AT  4:36 P.M.
AEROVANE………………..28 NW   AT  4:36 P.M.
ASOS……………………29 NNW  AT  4:37 P.M.
DAVIS…………………..27 WNW  AT  1:54 P.M. RMY 27
FASTEST MILE FOR YESTERDAY…………………19 NW   AT  4:36 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………20 NW   AT  3:50 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..18 WNW  AT  3:50 P.M.
AVERAGE WIND SPEED AND DIRECTION………….11.8 NW
ASOS………………….12.0
DAVIS…………………10.0 WNW [290 Deg.] *Last of several occurrences

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……….0.70  DEPARTURE……-1.63
ASOS…………..0.66
TOTAL PRECIPITATION FOR THE YEAR……….22.39  DEPARTURE……-6.91
ASOS………….22.78

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

7/1  84/67/76/+6/0.20/520/57                 32 S   AERO 35 S   RMY 34 TSTM
7/2  76/61/69/-1/0.00/811/91                 31 W   AERO 34 W   RMY 32
7/3  83/57/70/-1/0.00/766/84                 23 W   AERO 23 W   RMY 23
7/4  87/61/74/+3/0.00/847/93                 28 SSW AERO 28 SSW RMY 28
7/5  80/65/73/+2/0.29/309/34                 16 S   AERO 16 S   RMY N/A
7/6  92/68/80/+9/0.00/864/95                 22 WSW AERO 24 WSW RMY 22
7/7  77/61/69/-2/0.00/409/45                 21 NE  AERO 20 ENE RMY N/A
7/8  67/58/63/-9/0.02/000/00                 25 NE  AERO 25 NE  RMY 26
7/9  64/57/61/-11/0.09/000/00                20 NE  AERO 18 NE  RMY 17
7/10 66/56/61/-11/0.04/000/00                16 NE  AERO 16 NE  RMY 16
7/11 77/56/67/-5/0.00/415/46                 20 NNE AERO 21 NNE RMY 20
7/12 86/60/73/+1/0.00/848/94                 23 S   AERO 23 S   RMY 23
7/13 89/64/77/+5/0.00/874/97                 30 S   AERO 30 S   RMY 33
7/14 84/66/75/+3/0.01/…/..                 38 S   AERO 41 S   RMY 43
7/15 93/71/82/+10/0.00/…/..                23 W   AERO 23 W   RMY 23
7/16 93/69/81/+9/0.00/…/..                 25 WSW AERO 24 WSW RMY 24
7/17 83/72/78/+6/0.00/…/..                 18 ENE AERO 16 ENE RMY 19 TSTM
7/18 93/70/82/+10/0.05/…/..                41 WNW AERO 41 WNW RMY 43 TSTM
7/19 85/62/74/+2/0.00/…/..                 28 NW  AERO 28 NW  RMY 27

7/20 low temp since midnight is 59F; normal low is now 63F

DAILY RECORDS FOR JULY 2016
None so far.

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

RECORDS FOR JULY 20
HIGH 99F IN 1991
LOW 47F IN 1890
PRECIP 1.64 INS IN 1938
WIND 56e MPH SSW IN 1943

RECORDS FOR JULY 21
HIGH 100F IN 1977 [RECORD FOR MONTH] LOW 48F IN 1890
PRECIP 2.09 INS IN 1938
PEAK GUST 60e MPH WNW IN 1977

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle

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Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
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