Saturday, July 29, 2017
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JULY 29, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME
COOLER TEMPERATURES, OVERCAST SKIES, AND GUSTY WINDS
Cooler temperatures returned today, as a maximum of only 65F was reached
by the 1:00 P.M. EST observation. Early this morning, the temperature
went down to a minimum of 62F. Yesterday was the first day with above
normal temperatures since last Saturday (7/22), but the average
temperature for the day was just 1F above normal. The mean temperature
at Blue Hill is now very close to normal for the month of July.
Broken stratus and overcast altostratus were in the sky for most of
the day. Dew points stayed in the low 50s. Visibility has improved since
yesterday to 70 miles in most directions, except for 40 miles in the
northeast to south. Clouds increased and visibility worsened slightly
as the morning went on.
Winds were calm yesterday, but they started to pick up around midnight.
Winds shifted from the west yesterday to the northeast today. A peak gust
of 30 MPH was measured at 10:07 A.M. out of the NNE. A nor’easter passing
by in southern New England is causing the higher winds and lower
visibility to our NE-S, but the Boston area is expected to miss most of
the precipitation.
Today’s Observations:
7 A.M.
Weather: Scattered stratus, overcast altostratus
Temperature: 62F; Dew Point: 53F; Wind: NNE at 12G18 kts
Sea-level pressure: 29.88 ins. Hg, rising, then less quickly
Visibility: 70 miles, except 50 miles NE-S
6-hr Max temp: 65F
6-hr Min temp: 62F
24-hr precip: 0.00 in.
BHO SA 1155 41 SCT E140 OVC 70 118/62/53/0312G18/988/ VSBY NE-S 50/
8/62/ 51007 10065 20062
10 A.M.
Weather: Broken stratus, overcast altostratus
Temperature: 64F; Dew Point: 54F; Wind: NNE at 16G24 kts
Sea-level pressure: 29.88 ins. Hg, rising, then steady
Visibility: 70 miles, except 40 miles NE-S
BHO SA 1455 E32 BKN 140 OVC 70 119/64/54/0316G24/988/ VSBY NE-S 40/
8/62/ 50001
1 P.M.
Weather: Broken stratus, overcast altostratus
Temperature: 64F; Dew Point: 53F; Wind: NE at 14G22 kts
Sea-level pressure: 29.88 ins. Hg, steady, then falling
Visibility: 70 miles, except 40 miles NE-S
6-hr Max temp: 65F
6-hr Min temp: 62F
6-hr precip: 0.00
BHO SA 1755 E36 BKN 140 OVC 70 117/64/53/0414G22/988/ VSBY NE-S 40/
8/62/ 58002 10065 20062
SUMMARY FOR FRIDAY, JULY 28, 2017
TEMPERATURE (DEGREES F)
MAX…..82 NORMAL…..81
MIN…..64 NORMAL…..63
MEAN….73 NORMAL…..72
DEPARTURE FROM 30-YEAR NORMAL…………………….+1
TOTAL DEPARTURE FOR THE MONTH…………………….+3 [-0.1 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………8 DEPARTURE……….+1
TOTAL COOLING UNITS FOR THE MONTH………….211 DEPARTURE………+11
TOTAL COOLING UNITS FOR THE SEASON…………412 DEPARTURE………+83
TOTAL COOLING UNITS LAST SEASON TO DATE…….451 DEPARTURE………-39
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….16 W AT 2:18 A.M.
AERO……………………17 N AT 11:57 P.M.
ASOS……………………17 W AT 3:50 A.M.
DAVIS…………………..17 SW AT 12:00 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………12 W AT 3:20 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………14 W AT 3:52 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..12 N AT 11:59 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..6.7 SW
ASOS…………………..6.6
DAVIS………………….6.9 SW [233 DEG.]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00 DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.39 DEPARTURE……-0.17
ASOS…………..3.41
TOTAL PRECIPITATION FOR THE YEAR……….34.76 DEPARTURE……+4.23
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/…/.. 26 W AERO 26 W RMY 27
7/22 87/70/79/+7/T/…/.. 20 WNW AERO 20 WNW RMY N/A
7/23 72/61/67/-5/T/…/.. 33 NE AERO 32 NE RMY 33
7/24 62/54/58/-14/1.74/…/.. 38 NE AERO 37 ENE RMY 38
7/25 63/54/59/-13/0.03/…/.. 23 NNE AERO 21 NNE RMY N/A
7/26 79/55/67/-5/0.00/…/.. 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 Low temp since midnight is 62F; 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 29
HIGH 97F IN 1949
LOW 53F IN 1888,1914
PRECIP 1.53 INS IN 1901
PEAK GUST 40e MPH E IN 1941
RECORDS FOR JULY 30
HIGH 99F IN 1949
LOW 51F IN 1956
PRECIP 1.84 INS IN 1976
PEAK GUST 70e MPH SW 1944
TODAY’S REPORT PREPARED BY: Lizzy Suzedell
