Saturday, July 23, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JULY 23, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

HOT, DRY WEATHER BRINGS HOTTEST TEMPERATURES OF YEAR
TEMPS.RISE INTO MID-90’S (96.0F)(96) AT 4:38 P.M.EDT
BRIEF EVENING THUNDERSTORM LEAVES ONLY 0.09 RAIN

Temperatures continued to rise past mid-afternoon reaching
96.0 degrees at 4:38 P.M. EDT for the hottest so far this
year. It was also the 4th 90-degree day of the month and
the summer to date.
A brief thunderstorm left only 0.09 in. of rain last evening .

Today’s Observations:

7 A.M.
Weather: Sky clear, [SKC] Temperature: 76F; Dew Point: 67F; Wind: W at 6 kts
Sea-level pressure: 29.78 ins. Hg, rising then more slowly
Visibility: 20 miles, hazy
6-hr Max temp: 76F
6-hr Min temp: 70F
24-hr precip: 0.09 in. [TSTM] BHO SA 1155 CLR 20 085/76/67/2606/978/ SKC HAZY/ 51006
MANUAL 70009 ASOS 70008 10076 20070

10 A.M.
Weather: Clear, cumulus forming
Temperature: 87F; Dew Point: 64F; Wind: SW at 11 kts
Sea-level pressure: 29.76 ins. Hg, falling slowly
Visibility: 30 miles, hazy
BHO SA 1455 CLR 30 079/87/64/2611/976/ CUFRA FRMG OVHD-E SML
CU FRMG DSNT S-W-N HZY GST TO 20 KTS PST HR WND 23V29/
8/100 57006

1 P.M.
Weather: Scattered cumulus, moderate cumulus
Temperature: 91F; Dew Point: 59F; Wind: W at 12 kts,
Wind: Gust to 19 kts past hour
Wind: Direction variable SW-WNW
Sea-level pressure: 29.75 ins. Hg, falling then falling more rapidly
Visibility: 35 miles, except 45 miles WNW, hazy
6-hr Max temp: 93F
6-hr Min temp: 76F
BHO SA 1755 65 SCT 35 075/91/59/2612/975/ MDT CU ALQDS VSBY WNW 45
WND GUST 19 KTS PST HR WND 22V30/ 8/200 58004 10093 20076

SUMMARY FOR FRIDAY, JULY 22, 2016

TEMPERATURE (DEGREES F)
MAX…..96   NORMAL…..81
MIN…..70   NORMAL…..63
MEAN….83   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL……………………+11
TOTAL DEPARTURE FOR THE MONTH……………………+40 [+1.6 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..18   DEPARTURE………+10
TOTAL COOLING UNITS FOR THE MONTH………….195   DEPARTURE………+42
TOTAL COOLING UNITS FOR THE SEASON…………352   DEPARTURE………+70
TOTAL COOLING UNITS LAST SEASON TO DATE…….307   DIFFERENCE……..+45

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….33  SW   AT  12:14 P.M.
AEROVANE………………..33  SW   AT  12:14 P.M.
ASOS……………………35  SW   AT  12:14 P.M.
DAVIS…………………..33  SSW  AT  12:12 P.M. RMY 35
FASTEST MILE FOR YESTERDAY…………………23  SW   AT  12:11 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………24  SW   AT  12:11 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..23  SSW  AT  12:11 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..16.3 SSW
ASOS…………………..15.7
DAVIS………………….14.7 SW [220 Deg.] *Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.09  DEPARTURE……-0.04
ASOS…………..0.08
TOTAL PRECIPITATION FOR THE MONTH……….0.79  DEPARTURE……-1.93
ASOS…………..0.74
TOTAL PRECIPITATION FOR THE YEAR……….22.48  DEPARTURE……-7.21
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 83/59/71/-1/0.00/…/..                 23 NW  AERO 23 NW* RMY 24
7/21 89/63/76/+4/0.00/…/..                 28 W   AERO 26 W   RMY N/A
7/22 96/70/83/+11/0.09/…/..                33 SW  AERO 35 SW  RMY 35 TSTM

7/23 Low temp since midnight is 70F; 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 23
HIGH 99F IN 1952
LOW 51F IN 1923,1977
PRECIP 1.82 INS IN 1953
PEAK GUST 54e MPH S IN 1946

RECORDS FOR JULY 24
HIGH 96F IN 1987
LOW 49F IN 1893,1912
PRECIP 2.27 INS IN 2008
PEAK GUST 46 MPH NE IN 2009

TODAY’S REPORT PREPARED BY: Robert Skilling