Wednesday, September 6, 2017
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, SEPTEMBER 6, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME
MORNING THUNDERSTORM PASSES BHO
A fast-moving thunderstorm went through the region just
after the 10:00AM EST observation. Thunder and lightning
occurred for about 50 minutes. A rain shower passed at
noon, and light rain began again before 1:00PM for a total
of 0.05 inches of precip. measured at 1:00PM.
Temperatures quickly fell with the passage of the cold front
at about 12:10PM. The max. for the day reached 75F before
falling to 64F at the 1:00PM ob. Temps. continued to fall
after that reading. Along with decreasing temperatures, wind
direction shifted from SW to NNW with the front passage.
PRELIMINARY STATS FOR AUGUST 2017
TEMPERATURE, Deg. F
Avg. Max. 80.1 [+0.9]
Avg. Min. 61.4 [-0.4]
Mean 70.8 [+0.3]
24-hour corrected mean: 69.7
Max. for month: 89F on 19th
Min. for month: 55F on 26th, 27th, and 31st
COOLING DEGREE DAYS
Total cooling units: 186 [0]
Total for the season: 607 [+70]
Total for last season: 792
HEATING DEGREE DAYS
Total heating units: 2 [-14]
Total for the season: 26 [+2]
Total for last season: 10
PRECIPITATION, Inches
Total: 1.60 [-2.43]
Greatest in 24 hrs: 1.09 on the 2nd
WIND, mph
Avg. uncorrected wind speed: 9.3
Avg. corrected wind speed: 10.0
Prevailing wind direction: S at 18%
Peak gust and direction: 33 S on 18th
SUNSHINE:
Campbell-Stokes card minutes: 16,080 minutes of possible 24,780 or 65%
Astronomical total minutes: 16,694 minutes of possible 25,731 or 65%
Today’s Observations:
7 A.M.
Weather: Fog, overcast stratus
Temperature: 69F; Dew Point: 67F; Wind: S at 10 kts
Sea-level pressure: 29.89 ins. Hg, rising unsteadily
Visibility: 3 1/2 miles
6-hr Max temp: 69F
6-hr Min temp: 67F
24-hr Precip: 0.00 inches
BHO SA 1155 E3 OVC 31/2F 122/69/67/1910/989/ 8/6// 52004 10069 20067
10 A.M.
Weather: Thunderstorm, broken stratus fractus, overcast stratus
Temperature: 73F; Dew Point: 68F; Wind: S at 12G23 kts
Sea-level pressure: 29.91 ins. Hg, steady then rising
Visibility: 10 miles, except 15 miles NNW-E and 8 miles SSW-SSE,
distant fog in all directions
BHO SA 1455 E18 BKN 25 OVC 10TS 127/73/68/1912G23/991/ VSBY NNW-E 15
SSE-SSW 8 DSNT FG ALQDS TSB55/ 8/7// 53005
1 P.M.
Weather: Light rain, broken stratus fractus, overcast nimbostratus,
frontal passage at 12:10PM EST
Temperature: 64F; Dew Point: 60F; Wind: NNW at 9 kts,
Wind Shift: direction shifted from SW to NNW at 12:10PM EST
Sea-level pressure: 29.90 ins. Hg, falling then rising
Visibility: 15 miles, except 10 miles E, distant fog in all directions
6-hr Max temp: 75F
6-hr Min temp: 64F
6-hour Precip: 0.05 inches
BHO SA 1755 E26 BKN 35 OVC 15R- 125/64/60/3309/990/ VSBY E 10 DSNT FG ALQDS
WSHFT 10 FROPA R-B55/ 8/72/ 53003 MANUAL 6005/ ASOS 60005 10075 20064
SUMMARY FOR TUESDAY, SEPTEMBER 5, 2017
TEMPERATURE (DEGREES F)
MAX…..84 NORMAL…..75
MIN…..62 NORMAL…..58
MEAN….73 NORMAL…..67
DEPARTURE FROM 30-YEAR NORMAL…………………….+6
TOTAL DEPARTURE FOR THE MONTH……………………-22 [-4.6 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………8 DEPARTURE……….+5
TOTAL COOLING UNITS FOR THE MONTH…………..10 DEPARTURE……….-8
TOTAL COOLING UNITS FOR THE SEASON…………617 DEPARTURE………+62
TOTAL COOLING UNITS LAST SEASON TO DATE…….797 DEPARTURE……..-180
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0 DEPARTURE……….-2
TOTAL HEATING UNITS FOR THE MONTH…………..20 DEPARTURE………+13
TOTAL HEATING UNITS FOR THE SEASON………….46 DEPARTURE………+14
TOTAL HEATING UNITS LAST SEASON TO DATE……..11 DEPARTURE………+35
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….36 S AT 7:38 P.M.
AERO……………………32 S AT 7:39 P.M.
ASOS……………………40 S AT 7:39 P.M.
DAVIS…………………..36 SSW AT 7:23 P.M. RMY 38
FASTEST MILE FOR YESTERDAY…………………26 S AT 7:25 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………25 S AT 7:40 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..25 SSW AT 5:40 A.M.
AVERAGE WIND SPEED AND DIRECTION………….18.4 S
ASOS………………….18.7
DAVIS…………………16.1 SSW [198 DEG.]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00 DEPARTURE……-0.12
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.24 DEPARTURE……-0.34
ASOS…………..0.27
TOTAL PRECIPITATION FOR THE YEAR……….36.60 DEPARTURE……+1.00
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings
PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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
8/1 87/65/76/+4/0.00/762/88 16 ESE*AERO 16 NNW RMY 16
8/2 86/65/76/+4/1.09/372/43 32 W AERO 36 W RMY 34 TSTM
8/3 83/65/74/+2/0.00/552/64 22 S AERO 23 S RMY 24
8/4 84/66/75/+3/0.00/697/81 26 S AERO 30 S RMY 29
8/5 75/63/69/-3/0.10/060/07 23 NW AERO 28 NW RMY 29
8/6 76/57/67/-5/0.00/795/93 30 NW AERO 32 NW RMY 31
8/7 76/60/68/-4/0.01/597/70 28 SSW AERO 28 SSW RMY 29
8/8 74/60/67/-5/0.02/000/00 17 S AERO 16 SSE RMY 16
8/9 83/58/71/-1/0.00/831/98 18 S AERO 18 S RMY 19
8/10 86/63/75/+4/T/643/76 20 S AERO 18 S RMY 20
8/11 82/63/73/+2/0.00/666/79 17 S AERO 16 S RMY 17
8/12 75/57/66/-5/0.17/294/35 22 SSW*AERO 22 SSW RMY 23
8/13 84/67/76/+5/0.00/796/95 26 WNW AERO 24 WNW RMY 26
8/14 82/67/75/+4/0.00/359/43 14 SSW*AERO 14 S RMY 15
8/15 79/64/72/+1/T/058/07 21 S AERO 21 S RMY 23
8/16 83/64/74/+3/0.00/731/88 23 NW* AERO 23 NW RMY 25
8/17 81/58/70/-1/0.00/745/90 15 SSW AERO 14 SSW RMY N/A
8/18 79/63/71/0/0.01/025/03 33 S AERO 35 S RMY 35
8/19 89/65/77/+7/0.00/502/61 23 WSW AERO 23 WSW RMY 25
8/20 84/66/75/+5/0.00/804/98 23 NW AERO 25 NW RMY 27
8/21 85/63/74/+5/0.00/687/84 18 SW AERO 20 SW RMY 20
8/22 88/68/78/+8/0.00/481/59 31 S AERO 35 S RMY 34
8/23 83/64/74/+4/0.04/642/79 24 WNW*AERO 25 WNW RMY 27
8/24 80/59/70/0/0.00/778/96 18 WNW*AERO 17 WNW RMY 21
8/25 75/57/66/-3/T/597/74 21 NW AERO 21 NW RMY 23
8/26 75/55/65/-4/0.00/733/91 16 WNW AERO 16 SSE RMY 17
8/27 75/55/65/-4/0.00/770/96 17 ENE*AERO 16 ENE*RMY 18
8/28 74/56/65/-4/0.00/727/91 17 ENE AERO 16 ENE*RMY 18
8/29 68/57/63/-6/0.01/016/02 18 ENE AERO 16 ENE RMY N/A
8/30 72/57/65/-3/0.15/468/59 22 NNE AERO 21 NNE RMY 23
8/31 79/55/67/-1/0.00/506/64 23 NW AERO 24 NW RMY 27
DAILY RECORDS FOR AUGUST
None.
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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
9/1 68/47/58/-10/0.00/…/.. 26 WNW AERO 28 WNW RMY 31
9/2 72/46/59/-9/0.00/…/.. 18 NNW AERO 18 NNW RMY 21
9/3 63/52/58/-9/0.24/…/.. 33 W AERO 33 W RMY 37
9/4 79/55/67/0/0.00/…/.. 29 SSW AERO 28 SSW RMY N/A
9/5 84/62/73/+6/0.00/…/.. 36 S AERO 32 S RMY 38
9/6 Low temp since midnight is 67F; normal low is now 58F
DAILY RECORDS FOR SEPTEMBER
9/1/17: DAILY RECORD LOW MINIMUM TEMPERATURE OF 47F,
TIES PREVIOUS RECORD SET IN 1975
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR SEPTEMBER 6
HIGH 92F IN 1900
LOW 39F IN 1888
PRECIP 3.19 INCHES IN 1890
PEAK GUST 78e MPH SE IN 1979 (TROPICAL STORM DAVID)
RECORDS FOR SEPTEMBER 7
HIGH 92F IN 2007, 2015
LOW 40F IN 1888
PRECIP 2.95 INCHES IN 1891
PEAK GUST 58e MPH W IN 1941
TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle
