Sunday, September 9, 2018
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, SEPTEMBER 9, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME
EXCELLENT VISIBILITY DAY ON TOP OF GREAT BLUE HILL…
Humidity has stayed relatively low, allowing for 80 mile
visibility to persist from 7:00 A.M. through 1:00 P.M.
today. Temperatures have reached a maximum so far
of 61F, 13 degrees lower than our normal high of 74F.
Today has been windier than the past few days so far, with
frequent gusts over 12 knots all day. Cloudy skies continued
through 1:00 P.M., with a consistent overcast layer.
Today’s Observations:
7 A.M.
Weather: Scattered stratocumulus, overcast cirrostratus
Temperature: 55F; Dew Point: 47F; Wind: N at 8G13 kts
Sea-level pressure: 30.28 ins. Hg, rising, then more slowly
Visibility: 80 miles
6-hr Max temp: 55F
6-hr Min temp: 53F
24-hr Precip: 0.00 ins.
BHO SA 1155 50 SCT E250 OVC 80 254/55/47/0108G13/028/ 8/506
51014 10055 20053
10 A.M.
Weather: Broken altostratus, overcast cirrostratus
Temperature: 59F; Dew Point: 47F; Wind: ENE at 11G18 kts
Sea-level pressure: 30.31 ins. Hg, rising then falling
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E160 BKN 250 OVC 80 265/59/47/0611G18/031/ 8/026
50011
1 P.M.
Weather: Broken stratocumulus, overcast altostratus sun dimly
visible
Temperature: 59F; Dew Point: 45F; Wind: NE at 11G18 kts
Sea-level pressure: 30.32 ins. Hg, rising then steady
Visibility: 80 miles
6-hr Max temp: 61F
6-hr Min temp: 55F
6-hr Precip: 0.00 ins.
BHO SA 1755 E180 BKN 220 OVC 80 269/59/45/0511G18/032/ 8/41/ 51004
10061 20055
SUMMARY FOR SATURDAY, SEPTEMBER 8, 2018
TEMPERATURE (DEGREES F)
MAX…..68 NORMAL…..74
MIN…..54 NORMAL…..57
MEAN….61 NORMAL…..66
DEPARTURE FROM 30-YEAR NORMAL…………………..-5
TOTAL DEPARTURE FOR THE MONTH………………….+49 [+5.9 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0 DEPARTURE……….-3
TOTAL COOLING UNITS FOR THE MONTH…………..69 DEPARTURE………+42
TOTAL COOLING UNITS FOR THE SEASON…………822 DEPARTURE……..+258
TOTAL COOLING UNITS LAST SEASON TO DATE…….621 DEPARTURE……..+201
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY…………………22 NE AT 10:39 A.M.
AERO……………………..18 NE AT 10:27 A.M.
ASOS……………………..22 NE AT 10:10 A.M.
DAVIS…………………….21 NE AT 10:09 A.M. RMY 21
FASTEST MILE FOR YESTERDAY…………………..15 NE AT 12:20 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………..15 NE AT 11:12 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………….15 NE AT 11:12 A.M.
AVERAGE WIND SPEED AND DIRECTION…………….8.2 N
ASOS…………………….8.7
DAVIS……………………8.6 N [1 DEG]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.01 DEPARTURE……-0.11
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.57 DEPARTURE……-0.39
ASOS…………..0.53
TOTAL PRECIPITATION FOR THE YEAR……….38.52 DEPARTURE……+2.72
ASOS………….40.05
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/…/.. 17 NE AERO 15 NE RMY 16
9/2 83/61/72/+4/0.00/…/.. 20 SSW AERO 18 SSW RMY N/A
9/3 92/68/80/+13/0.00/…/.. 24 WSW AERO 22 WSW RMY 25
9/4 88/70/79/+12/0.00/…/.. 17 W AERO 16 W RMY 17
9/5 89/67/78/+11/0.00/…/.. 23 SSW AERO 23 SSW RMY 25
9/6 92/70/81/+14/…./…/.. 29 NNW AERO 29 NNW RMY N/A
9/7 70/63/67/+1/…./…/.. 24 NE AERO 22 NE RMY N/A
9/8 68/54/61/-5/0.00/…/.. 22 NE AERO 18 NE RMY 21
9/9 Low temp since midnight is 53F; normal low is now 57F
DAILY RECORDS FOR SEPTEMBER
09/04/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 70F,
BREAKS PREVIOUS RECORD OF 68F SET IN 1937 AND 1959
09/06/18: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 92F,
TIES PREVIOUS RECORD OF 92F SET IN 1900
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: Samantha Richard
