Sunday, September 2, 2018
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, SEPTEMBER 2, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME
SOUTHERLY WIND BRINGS SLIGHTLY WARMER AIR TO
GREAT BLUE HILL TODAY…
A VERY WARM AUGUST FINISHES AS SECOND WARMEST ON RECORD…
Temperatures rose today to above normal due to a
shift in wind direction from the north to south.
So far today we reach a maximum high temperature
of 83F, which is 7 degrees above our daily normal
of 76F. Our visibility rose today from 20 miles
at our 7:00 observation to 40 miles at our 1:00
observation as humidity decreased from 73% to
45%. Pressure dropped, causing an increase in
cloud cover as the day progressed. On this day
in 1953, we experienced the highest temperature
ever observed in the month of September at Blue
Hill Observatory, with a max that day of 99F.
With a 24-hour adjusted mean temperature of 73.4 degrees F,
August was the second warmest on record. The average maximum
tied for the eighth warmest, and the average maximum temperature
of 66.3 deg F was the warmest on record by more than a degree F.
BHO Warmest August 24-hour Adjusted Mean Temperature, deg F (1885-2018):
1) 74.1 in 2016
2) 73.4 in 2018
3) 72.6 in 2012
4) 72.5 in 1988
5) 72.4 in 2015
BHO Warmest August Average Maximum Temperature, deg F (1885-2018):
1) 85.1 in 2016
2) 83.2 in 2005
3) 83.1 in 1949
4) 82.6 in 2015
5) 82,5 in 1988
82.5 in 2002
82.5 in 2012
8) 82.4 in 1944
82.4 in 2018
BHO Warmest August Average Minimum Temperature, deg F (1885-2018):
1) 66.3 in 2018
2) 65.0 in 2016
3) 64.9 in 2001
4) 64.6 in 2012
5) 64.4 in 2005
64.4 in 2015
PRELIMINARY STATS FOR AUGUST 2018
TEMPERATURE, Deg. F
Avg. Max. 82.4 [+3.2]
Avg. Min. 66.3 [+4.6]
Mean 74.4 [+4.0]
24-hour corrected mean: 73.4
Max. for month: 94F on 29th
Min. for month: 58F on 31st
COOLING DEGREE DAYS
Total heating units: 297 [+112]
Total for the season: 753 [+216]
Total for last season: 607
PRECIPITATION, Inches
Total: 3.94 [-0.09]
Greatest in 24 hrs: 1.16 on the 4th
WIND, mph
Avg. uncorrected wind speed: 9.6
Avg. corrected wind speed: 10.2
Prevailing wind direction: SW at 13%
Peak gust and direction: 35 NW on 3rd
35 WNW on 22nd
SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes: N/A
Today’s Observations:
7 A.M.
Weather: Few altocumulus N-NNE, few cirrostratus in
all directions
Temperature: 66F; Dew Point: 61F; Wind: SW @04 kts,
Wind: Light
Sea-level pressure: 30.29 ins. Hg, rising, then more rapidly
Visibility: 20 miles, distant haze in all directions
6-hr Max temp: 66F
6-hr Min temp: 61F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 20 257/66/61/2205/029/ FEW AC N-NNE FEW CS
ALQDS DSNT HZ ALQDS WND LGT/ 8/038 51010 10066 20061
10 A.M.
Weather: Scattered altocumulus, scattered cirrostratus
Temperature: 75F; Dew Point: 55F; Wind: S at 06G11 kts,
Wind: Light
Sea-level pressure: 30.29 ins. Hg, rising then falling
Visibility: 40 miles, distant haze in all directions
3-hr Precip: 0.00 ins.
BHO SA 1455 60 SCT 300 SCT 40 259/75/55/1806G11/029/DSNT
HZ ALQDS WND LGT/ 8/038 58002
1 P.M.
Weather: Broken cirrus, few stratocumulus WSW-NW, few
altocumulus standing lenticular NW-N
Temperature: 81F; Dew Point: 58F; Wind: S at 07G13 kts
Sea-level pressure: 30.29 ins. Hg, falling then rising
Visibility: 40 miles, distant haze in all directions
6-hr Max temp: 83F
6-hr Min temp: 66F
6-hr Precip: 0.00 ins.
BHO SA 1755 250 BKN 40 241/81/58/1907G13/029/ FEW DSNT
SC WSW-NW FEW ACSL NW-N DSNT HZ ALQDS/ 8/448 56018 10083
20066
SUMMARY FOR SATURDAY, SEPTEMBER 1, 2018
TEMPERATURE (DEGREES F)
MAX…..75 NORMAL…..76
MIN…..58 NORMAL…..59
MEAN….67 NORMAL…..68
DEPARTURE FROM 30-YEAR NORMAL…………………..-1
TOTAL DEPARTURE FOR THE MONTH…………………..-1 [-1.2 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………2 DEPARTURE……….-2
TOTAL COOLING UNITS FOR THE MONTH……………2 DEPARTURE……….-2
TOTAL COOLING UNITS FOR THE SEASON…………755 DEPARTURE……..+214
TOTAL COOLING UNITS LAST SEASON TO DATE…….607 DEPARTURE……..+148
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY…………………17 NE AT 1:33 P.M.
AERO……………………..15 NE AT 1:34 P.M.
ASOS……………………..17 ENE AT 2:44 P.M.
DAVIS…………………….17 NE AT 1:33 P.M. RMY 16
FASTEST MILE FOR YESTERDAY…………………..12 NE AT 1:30 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………..13 E AT 3:49 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………….13 NE AT 1:34 P.M.
AVERAGE WIND SPEED AND DIRECTION…………….7.2 NE
ASOS…………………….7.8
DAVIS……………………7.4 ENE [78 DEG]
* LAST OF MULTIPLE OCCURRENCES
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00 DEPARTURE……-0.11
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.00 DEPARTURE……-0.11
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE YEAR……….37.95 DEPARTURE……+3.00
ASOS………….39.52
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 82/66/74/+2/T/199/23 31 S AERO 30 S RMY 31
8/2 92/74/83/+11/0.00/761/88 30 SW AERO 28 SW RMY 31
8/3 88/74/81/+9/0.19/492/57 35 NW AERO 32 NW RMY 35 TSTM
8/4 82/69/76/+4/1.16/301/35 28 SW AERO 25 SW RMY 30 TSTM
8/5 89/66/78/+6/0.00/815/95 20 W AERO 18 W RMY 19
8/6 92/71/82/+10/0.00/822/96 20 W AERO 16 WSW RMY N/A
8/7 92/73/83/+11/0.00/682/80 25 S AERO 23 S RMY 26
8/8 88/71/80/+8/0.70/460/54 25 SSW AERO 25 SSW RMY N/A TSTM
8/9 86/70/78/+6/0.07/509/60 29 SW AERO 28 SW RMY N/A TSTM
8/10 85/66/76/+5/0.00/651/77 17 NW AERO 16 NW RMY N/A
8/11 70/66/68/-3/0.34/000/00 18 SE AERO 17 SE RMY 18
8/12 73/66/70/-1/0.39/000/00 23 NNE AERO 18 NNE RMY 21
8/13 69/64/67/-4/0.17/000/00 23 ENE AERO 21 ENE RMY 21
8/14 83/69/76/+5/0.00/502/60 25 S AERO 23 S RMY 24
8/15 86/68/77/+6/0.00/509/61 20 W AERO 17 W RMY 19
8/16 87/70/79/+8/0.00/515/62 20 W AERO 18 W RMY 20
8/17 83/67/75/+4/0.00/531/64 23 SSW AERO 23 SSW RMY N/A
8/18 83/63/73/+2/0.50/165/20 31 NE AERO 30 NE RMY 33 TSTM
8/19 68/62/65/-5/0.03/527/64 30 NE AERO 30 NE RMY 32
8/20 72/61/67/-3/0.00/591/72 28 ENE AERO 25 ENE RMY 27
8/21 69/61/65/-5/T/155/19 20 ESE AERO 17 ESE RMY N/A
8/22 82/62/72/+2/0.38/326/40 35 WNW AERO 35 WNW RMY 35
8/23 76/60/68/-2/0.01/187/23 25 NW AERO 23 NW RMY 27
8/24 82/59/71/+1/0.00/754/93 20 SSE AERO 18 SSE RMY 20
8/25 80/59/70/+1/0.00/735/91 20 S AERO 18 S RMY 20
8/26 81/59/70/+1/0.00/716/89 21 SSW AERO 20 SSW RMY 21
8/27 86/67/77/+8/0.00/706/88 21 WNW AERO 18 WNW RMY 18
8/28 93/72/83/+14/0.00/672/84 25 WSW AERO 25 WSW RMY 28
8/29 94/75/85/+16/0.00/…/.. 25 SW AERO 24 SW RMY 27
8/30 88/67/78/+10/0.00/…/.. 23 ENE AERO 21 ENE RMY N/A
8/31 72/60/66/-3/0.00/…/.. 24 ENE AERO 23 ENE RMY N/A
DAILY RECORDS FOR AUGUST 2018
08/03/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 74F,
BREAKS PREVIOUS RECORD OF 71F SET IN 1928, 1969, AND 1979
08/07/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 73F,
BREAKS PREVIOUS RECORD OF 72F SET IN 1988
08/29/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 75F,
BREAKS PREVIOUS RECORD OF 74F SET IN 1948
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 75/58/67/-1/0.00/…/..
9/2 Low temp since midnight is 61F; normal low is now 59F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR SEPTEMBER 2
HIGH 99F IN 1953 (SEPTEMBER MAXIMUM RECORD)
LOW 44F IN 1909
PRECIP 2.73 INCHES IN 1947
PEAK GUST 55e MPH WNW IN 1944
RECORDS FOR SEPTEMBER 3
HIGH 95F IN 1929
LOW 43F IN 1983
PRECIP 3.82 INCHES IN 1972 (TROPICAL STORM CARRIE)
PEAK GUST 58 MPH NNE IN 1972 (TROPICAL STORM CARRIE)
TODAY’S REPORT PREPARED BY: Samantha Richard/Kaitlin Geagan
