Saturday, September 2, 2017
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, SEPTEMBER 2, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME
COOLEST TEMPERATURE OF THE SEASON SO FAR…
The morning low temperature of 46F is the coldest observed
so far this season on the summit, though this did not reach
the record for the date of 44F set in 1909. The low temperature
at nearby Norwood Airport this morning was a chilly 36F. The
low temperature on Friday of 47F tied the record for the date
previously set in 1975.
High clouds have generally been on the increase during the
day today as a storm system including the remains of post-
tropical cyclone Harvey approach the area. With dew points
in the 30s, the visibility has been very high near 75-80
miles all day.
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 heating units: 186 [0]
Total for the season: 607 [+70]
Total for last season: 792
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: Thin scattered cirrus, few lower dense cirrus
all quadrants
Temperature: 52F; Dew Point: 39F; Wind: NW at 10 kts
Sea-level pressure: 30.24 ins. Hg, rising then more slowly
Visibility: 75 miles
6-hr Max temp: 52F
6-hr Min temp: 46F
24-hr Precip: 0.00 inches
BHO SA 1155 180 -SCT 75 239/52/39/3210/024/ FEW LWR DNS
CI ALQDS/ 8/001 51015 10052 20046
10 A.M.
Weather: Scattered cirrostratus and cirrus fibratus, few
higher cirrus overhead, few altocumulus distant SW
Temperature: 64F; Dew Point: 37F; Wind: WNW at 7 kts
Sea-level pressure: 30.24 ins. Hg, rising then, falling
Visibility: 80 miles
BHO SA 1455 170 SCT 80 240/64/37/2907/024/ FEW HIER CI
OVHD FEW AC DSNT SW/ 8/035 50001
1 P.M.
Weather: Scattered cirrostratus, thin broken cirrus and
cirrocumulus
Temperature: 69F; Dew Point: 36F; Wind: WNW at 5 kts
Wind: Light and variable
Sea-level pressure: 30.20 ins. Hg, falling then, more quickly
Visibility: 75 miles
6-hr Max temp: 71F
6-hr Min temp: 52F
BHO SA 1755 170 SCT 200 -BKN 75 228/69/36/3005/020/ CC OVHD
WND LGT AND VRB/ 8/008 58012 10071 20052
SUMMARY FOR FRIDAY, SEPTEMBER 1, 2017
TEMPERATURE (DEGREES F)
MAX…..68 NORMAL…..76
MIN…..47 NORMAL…..59
MEAN….58 NORMAL…..68
DEPARTURE FROM 30-YEAR NORMAL……………………-10
TOTAL DEPARTURE FOR THE MONTH……………………-10 [-10.2 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0 DEPARTURE……….-4
TOTAL COOLING UNITS FOR THE MONTH……………0 DEPARTURE……….-4
TOTAL COOLING UNITS FOR THE SEASON…………607 DEPARTURE………+66
TOTAL COOLING UNITS LAST SEASON TO DATE…….795 DEPARTURE……..-188
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….26 WNW AT 3:59 P.M.
AERO……………………28 WNW AT 3:59 P.M.
ASOS……………………30 WNW AT 1:53 P.M.
DAVIS…………………..28 NW AT 10:57 A.M. RMY 31
FASTEST MILE FOR YESTERDAY…………………21 WNW AT 16:00 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE………………22 W AT 1:22 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..21 W AT 1:22 P.M.
AVERAGE WIND SPEED AND DIRECTION………….12.7 NW
ASOS………………….12.7
DAVIS…………………11.1 NW [313 DEG.]
*Last of several 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……….36.36 DEPARTURE……+1.23
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/…./016/02 18 ENE AERO 16 ENE RMY N/A
8/30 72/57/65/-3/…./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 so far.
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 Low temp since midnight is 46F; normal low is now 59F
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 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: Mike Iacono / Kaitlin Geagan
