Wednesday, September 9, 2020
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, SEPTEMBER 9, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME
OVERCAST WITH LIMITED VISIBILITY, AND
SLIGHTLY ON THE WARMER SIDE….
Today was overcast, with either a smoke layer or haze
limiting visibility to 50 miles at 1 P.M. Could this
be smoke from the wildfires on the west coast? Wind
is coming in from the south, but very light. An average
speed of 5 mph and a max gust of 11 mph have been seen
so far.
We could really use some rainfall as our precipitation
deficit starts to mount. The departure for the year
is getting close to 3 inches again, sitting at -2.95
inches as of this morning.
The high so far today is 79F, 5 degrees above the daily
normal max of 74F. The low since midnight is 62F, which is
5 degrees above the normal low of 57F.
PRELIMINARY STATS FOR AUGUST 2020
TEMPERATURE, Deg. F
Avg. Max. 82.5 [+3.3]
Avg. Min. 64.3 [+2.5]
Mean 73.4 [+2.9]
24-hour corrected mean: 72.3
Max. for month: 94F on the 10th
Min. for month: 54F on the 31st
HEATING DEGREE DAYS
Total heating units: 2 [-14]
Total for the season: 3 [-22]
Total for last season: 12
COOLING DEGREE DAYS
Total cooling units: 270 [+84]
Total for the season: 757 [+220]
Total for last season: 622
PRECIPITATION, Inches
Total: 3.74 [-0.29]
Greatest in 24 hrs: N/A
WIND, mph
Avg. uncorrected wind speed: 10.0 mph
Avg. corrected wind speed: 10.6 mph
Prevailing wind direction: SSW [12%]
Peak gust and direction: 67 SSE on the 4th
SUNSHINE:
Campbell-Stokes card minutes: 15366 minutes of a possible 24780 or 62%
Astronomical total minutes: 15940 minutes of a possible 25709 or 62%
Today’s Observations:
7 A.M.
Weather: Overcast stratus
Temperature: 62F; Dew Point: 61F; Relative Humidity: 95%
Wind: SSW at 4 kts, wind light and variable
Sea-level pressure: 30.30 ins. Hg: rising steadily
Visibility: 3 miles, fog
6-hr Max temp: 65F
6-hr Min temp: 62F
24-hr Precip: 0.00 ins.
BHO SA 1155 8 OVC 3F 262/62/61/2104/030/ WND L/V/ 8/6//
51016 10065 20062
10 A.M.
Weather: Broken altostratus and cirrostratus
Temperature: 73F; Dew Point: 62F; Relative Humidity: 68%
Wind: SSW at 5 kts, wind light
Sea-level pressure: 30.14 ins. Hg: falling then rising
Visibility: 25 miles, thin smoke layer in all directions
3-hr Precip: 0.00 ins.
BHO SA 1455 180 BKN 250 BKN 25 268/73/62/2105/032/ THN K
LYR ALQDS WND LGT/ 8/057 50006
1 P.M.
Weather: Overcast cirrus
Temperature: 78F; Dew Point: 60F; Relative Humidity: 54%
Wind: S at 6 kts, wind light
Sea-level pressure: 30.31 ins. Hg: rising, then falling
Visibility: 50 miles
6-hr Max temp: 79F
6-hr Min temp: 62F
6-hr Precip: 0.00 ins.
BHO SA 1755 250 OVC 50 266/78/60/1706/031/ WND LGT/ 8/007 57002
10079 20062
SUMMARY FOR TUESDAY, SEPTEMBER 8, 2020
TEMPERATURE (DEGREES F)
MAX…..82 NORMAL…..75
MIN…..61 NORMAL…..57
MEAN….72 NORMAL…..66
DEPARTURE FROM 30-YEAR NORMAL……………. +6
TOTAL DEPARTURE FOR THE MONTH……………. +15 [+1.7 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY………… 7 DEPARTURE……+4
TOTAL COOLING UNITS FOR THE MONTH………… 32 DEPARTURE……+5
TOTAL COOLING UNITS FOR THE SEASON………..789 DEPARTURE….+225
TOTAL COOLING UNITS LAST SEASON TO DATE……634 DEPARTURE….+155
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..17 S AT 7:55 P.M.
AERO…………………….16 S AT 8:00 P.M.
ASOS…………………….17 S AT 7:58 P.M.
DAVIS……………………18 S AT 8:03 P.M.
RMY 16 MERLIN 17
FASTEST MILE FOR YESTERDAY………………….12 S AT 7:56 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….13 S AT 8:58 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………13 S AT 8:03 P.M.
AVERAGE WIND SPEED AND DIRECTION……………7.4 S
ASOS……………………8.0
DAVIS…………………..7.2 SSW [208 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……….0.22 DEPARTURE….-0.74
ASOS…………..0.24
TOTAL PRECIPITATION FOR THE YEAR……….33.03 DEPARTURE….-2.95
ASOS………….33.82
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
08/01 87/66/77/+5/0.00/866/100 18 S AERO 21 S RMY 19
08/02 85/69/77/+5/0.02/320/37 36 S AERO 37 S RMY 38
08/03 91/75/83/+11/0.00/715/83 36 WSW AERO 38 SW RMY 36
08/04 83/71/77/5/0.21/094/11 67 SSE AERO 71 S RMY 70
08/05 90/68/79/+7/0.00/668/78 28 SW AERO 30 SW RMY 29
08/06 84/65/75/3/0.00/701/82 20 W AERO 17 W RMY 19
08/07 79/65/72/0/T/136/16 16 NE AERO 16 NE RMY N/A
08/08 83/64/74/+2/0.00/612/72 20 S AERO 20 S RMY 19
08/09 90/65/78/+6/0.00/661/78 26 SSW AERO 26 SSW RMY 26
08/10 94/69/82/+11/0.00/727/86 22 W AERO 20 W RMY 20
08/11 92/72/82/+11/0.00/708/84 31 SSW AERO 35 SSW RMY 31 TSTM
08/12 93/74/84/+13/0.00/647/77 22 SSW AERO 22 SW RMY 19
08/13 88/71/80/+9/0.00/528/63 18 ENE AERO 18 NE RMY 18
08/14 82/67/75/+4/0.00/618/74 23 ENE AERO 23 ENE RMY N/A
08/15 67/62/65/-6/T/000/00 33 NNE AERO 32 NNE RMY N/A
08/16 69/62/66/-5/…./000/00 26 ENE AERO 28 ENE RMY 26
08/17 73/59/66/-5/…./339/41 25 NE AERO 24 NE RMY N/A
08/18 84/63/74/+3/…./784/95 23 W AERO 23 W RMY 24
08/19 81/59/70/0/0.03/526/64 26 W AERO 28 W RMY 27
08/20 80/56/68/-2/0.00/804/98 22 W AERO 21 W RMY 22
08/21 88/61/75/+5/0.00/719/88 28 SW AERO 26 SW RMY 28
08/22 85/66/76/+6/0.26/521/64 18 NNE AERO 16 S RMY 16
08/23 89/63/76/+6/2.21/552/68 60 WNW AERO 53 WNW RMY 58 TSTM HAIL
08/24 87/67/77/+7/0.00/493/61 18 S AERO 18 S RMY 19 TSTM
08/25 86/65/76/+7/0.01/492/61 35 NNW AERO 37 NNW RMY 35
08/26 74/56/65/-4/0.00/780/97 29 NW AERO 32 NW RMY N/A
08/27 68/57/63/-6/0.33/008/01 18 SSE AERO 20 SSE RMY 20 TSTM
08/28 80/59/70/+1/0.00/559/70 20 W AERO 20 W RMY N/A
08/29 74/65/70/+1/0.06/000/00 32 W AERO 32 W RMY N/A
08/30 75/57/66/-2/0.00/793/100 36 W AERO 36 W RMY N/A
08/31 75/54/65/-3/0.00/569/72 20 S AERO 20 S RMY 20
DAILY RECORDS FOR AUGUST 2020
8/23/20: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 89F,
BREAKS PREVIOUS RECORD of 88F SET IN 1918, 1947, 1949, 1996
8/23/20: DAILY RECORD PRECIPITATION OF 2.21 INS,
BREAKS PREVIOUS RECORD OF 2.09 INS SET IN 2010
8/23/20: DAILY RECORD PEAK WIND GUST OF 60 MPH,
TIES PREVIOUS RECORD OF 60 MPH SET IN 1940
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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
09/01 76/59/68/0/0.00/…/.. 22 SSE AERO 21 SE RMY 20
09/02 69/59/64/-4/…/…/.. 23 SSE AERO 23 SSE RMY 24
09/03 75/66/71/+4/…/…/.. 22 SSW AERO 21 SSW RMY n/a
09/04 82/62/72/+5/0.00/…/.. 26 WNW AERO 26 WNW RMY 25
09/05 76/55/66/-1/0.00/…/.. 25 W AERO 25 W RMY 24
09/06 78/58/68/+1/0.00/…/.. 24 W AERO 24 W RMY N/A
09/07 79/61/70/+4/0.00/…/.. 27 SSE AERO 30 SSE RMY 28
09/08 82/61/72/+6/0.00/…/.. 17 S AERO 16 S RMY 17
09/09 The low since midnight is 62F, the daily normal low is 57F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR SEPTEMBER 9
HIGH 92F IN 2015
LOW 41F IN 1938
PRECIP 1.97 INCHES IN 1969
PEAK GUST 52 MPH WNW IN 1969, NW IN 1978
RECORDS FOR SEPTEMBER 10
HIGH 90F IN 1931,1989
LOW 41F IN 1956
PRECIP 5.60 INCHES IN 1999 (DAILY RECORD FOR SEPTEMBER)
PEAK GUST 48 MPH NW IN 1972
TODAY’S REPORT PREPARED BY: Benjamin Turner
