Sunday, July 30, 2017
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JULY 30, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME
HIGH PRESSURE BRINGS WARM, CLEAR DAY
Conditions have drastically changed today with the arrival
of high pressure over the region. Temperatures had reached
a maximum temp. of 75F by 1:00PM compared to yesterday’s
max. temp. of 67F. Skies were clear during the morning
observations with few higher level clouds. Cumulus began
to form in the late morning and became scattered by after-
noon. The clearing conditions also allowed for excellent
visibility today at 70 miles.
Yesterday’s average temperature of only 62F was 10F below
normal and resulted in July’s monthly temperature departure
dipping below zero for the first time this month. As of
midnight, the cumulative temperature departure for July
is 7F below normal, or -0.4 degrees per day.
Today’s Observations:
7 A.M.
Weather: Few altocumulus ESE-SSW and few cirrus ENE-SSE and NW-NNE
Temperature: 62F; Dew Point: 51F; Wind: N at 7 kts
Sea-level pressure: 29.97 ins. Hg, rising, then less quickly
Visibility: 70 miles
6-hr Max temp: 62F
6-hr Min temp: 55F
24-hr precip: 0.00 in.
BHO SA 1155 CLR 70 150/62/51/3507/997/ FEW AC ESE-SSW FEW CI ENE-SSE
AND NW-NNE/ 8/031 51014 10062 20055
10 A.M.
Weather: Few cumulus E-SSW and W-NNE, few cirrus E-S
Temperature: 71F; Dew Point: 52F; Wind: NE at 6 kts,
Wind speed: Light
Sea-level pressure: 30.00 ins. Hg, rising, then less quickly
Visibility: 70 miles
BHO SA 1455 CLR 70 159/71/52/0506/000/ FEW CU E-SSW AND W-NNE
FEW CI E-S WND LGT/ 8/101 51009
1 P.M.
Weather: Scattered cumulus, few cirrus SE-S
Temperature: 75F; Dew Point: 51F; Wind: ENE at 7 kts
Sea-level pressure: 30.02 ins. Hg, falling then rising
Visibility: 70 miles
6-hr Max temp: 75F
6-hr Min temp: 62F
BHO SA 1755 59 SCT 70 166/75/51/0607/002/ FEW CI SE-S/
8/101 53007 10075 20062
SUMMARY FOR SATURDAY, JULY 29, 2017
TEMPERATURE (DEGREES F)
MAX…..97 NORMAL…..81
MIN…..56 NORMAL…..63
MEAN….62 NORMAL…..72
DEPARTURE FROM 30-YEAR NORMAL……………………-10
TOTAL DEPARTURE FOR THE MONTH…………………….-7 [-0.4 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0 DEPARTURE……….-7
TOTAL COOLING UNITS FOR THE MONTH………….211 DEPARTURE……….+3
TOTAL COOLING UNITS FOR THE SEASON…………412 DEPARTURE………+75
TOTAL COOLING UNITS LAST SEASON TO DATE…….460 DEPARTURE………-48
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….30 NNE AT 10:07 A.M.
AERO……………………32 NNE AT 9:17 A.M.
ASOS……………………34 NE AT 9:06 A.M.
DAVIS…………………..31 NNE AT 10:10 A.M. RMY 33
FASTEST MILE FOR YESTERDAY…………………21 NNE AT 9:27 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………23 NNE AT 9:28 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..21 NNE AT 9:28 A.M.
AVERAGE WIND SPEED AND DIRECTION………….14.1 NE
ASOS………………….13.8
DAVIS…………………12.5 NNE [029 DEG.]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00 DEPARTURE……-0.15
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.39 DEPARTURE……-0.32
ASOS…………..3.41
TOTAL PRECIPITATION FOR THE YEAR……….34.76 DEPARTURE……+4.08
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/+7/0.00/835/94 26 W AERO 26 W RMY 27
7/22 87/70/79/+7/T/266/30 20 WNW AERO 20 WNW RMY N/A
7/23 72/61/67/-5/T/681/77 33 NE AERO 32 NE RMY 33
7/24 62/54/58/-14/1.74/000/00 38 NE AERO 37 ENE RMY 38
7/25 63/54/59/-13/0.03/203/23 23 NNE AERO 21 NNE RMY N/A
7/26 79/55/67/-5/0.00/703/80 21 S* AERO 22 SSE RMY N/A
7/27 72/59/66/-6/0.04/…/.. 21 SSW AERO 23 SW RMY 22
7/28 82/64/73/+1/…./…/.. 16 W AERO 17 N RMY N/A
7/29 67/56/62/-10/0.00/…/.. 30 NNE AERO 32 NNE RMY 33
7/30 Low temp since midnight is 55F; 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 30
HIGH 99F IN 1949
LOW 51F IN 1956
PRECIP 1.84 INS IN 1976
PEAK GUST 70e MPH SW 1944
RECORDS FOR JULY 31
HIGH 95F IN 1917
LOW 50F IN 1895,1918
PRECIP 1.34 INS IN 1892
PEAK GUST 43e MPH WNW SW IN 1953, 43 SW IN 1971
TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle
