Saturday, October 7, 2017
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, OCTOBER 7, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME
ABOVE NORMAL TEMPERATURES AND INCREASING HUMIDITY
Southwesterly flow is keeping temperatures above normal with today
again being nearly 10F warmer than average. The minimum and max-
imum by 1:00PM were 59F and 73F, respectively. Dew points were on
the rise as more humid air entered the area and measured into the
mid 60s in the early afternoon. Hazy conditions kept visibility
at 20-40 miles beginning in the late morning. Skies were nearly
overcast this morning with stratocumulus and altocumulus but cleared
to partly cloudy with altocumulus and cirrus later in the day.
PRELIMINARY STATS FOR SEPTEMBER 2017
TEMPERATURE, Deg. F
Avg. Max. 74.5 [+2.9]
Avg. Min. 57.3 [+2.7]
Mean 65.9 [+2.8]
24-hour corrected mean: 65.1
Max. for month: 86F on 25th and 27th
Min. for month: 44F on 30th
HEATING DEGREE DAYS
Total heating units: 67 [-50]
Total for the season: 93 [-49]
Total for last season: 75
COOLING DEGREE DAYS
Total cooling units: 100 [+40]
Total for the season: 707 [+110]
Total for last season: 894
PRECIPITATION, Inches
Total: 5.50 [+1.44]
Greatest in 24 hrs: 2.33 on the 30th
WIND, mph
Avg. uncorrected wind speed: 10.2
Avg. corrected wind speed: 10.8
Prevailing wind direction: NNE at 13%
Peak gust and direction: 47 NNE on 21st
SUNSHINE:
Campbell-Stokes card minutes: 12,036 minutes of possible 21,582 or 56%
Astronomical total minutes: 12,506 minutes of possible 22,427 or 56%
BHO Warmest September 24-Hour Mean Temperature, deg F (1885-2017):
1) 67.2 in 2015
2) 66.1 in 1961
3) 65.5 in 2005
4) 65.4 in 1999
65.4 in 2010
6) 65.3 in 1930
7) 65.2 in 2016
8) 65.1 in 2017
9) 65.0 in 2002
10) 64.9 in 1983
BHO Lowest September Mean Wind Speed, mph (1885-2017):
1) 10.5 in 2014
2) 10.6 in 2013
3) 10.7 in 2011
10.7 in 2015
5) 10.8 in 2017
6) 10.9 in 1917
10.9 in 2003
Today’s Observations:
7 A.M.
Weather: Broken stratocumulus, broken altocumulus
Temperature: 60F; Dew Point: 56F; Wind: SE at 8 kts
Sea-level pressure: 30.17 ins. Hg, falling then rising
Visibility: 70 miles, except 40 miles SW-ESE, distant fog in all
directions
6-hr Max temp: 62F
6-hr Min temp: 59F
24-hr precip: Trace
BHO SA 1155 E49 BKN 89 BKN 70 217/60/56/1308/017/ VSBY SW-ESE 40
DSNT FG ALQDS/ 8/510 53001 10062 20059
10 A.M.
Weather: Scattered stratocumulus, scattered altocumulus
Temperature: 71F; Dew Point: 61F; Wind: S at 8 kts
Sea-level pressure: 30.18 ins. Hg, rising then falling
Visibility: 30 miles, except 20 miles SSE-SW, distant fog SSE-SW,
distant haze in all directions
BHO SA 1455 34 SCT 84 SCT 30 219/71/61/1808/018/ VSBY SSE-SW 20
DSNT FG SSE-SW DSNT HZ ALQDS/ 8/530 50002
1 P.M.
Weather: Few cumulus in all directions, scattered altocumulus,
broken cirrus
Temperature: 73F; Dew Point: 64F; Wind: S at 8 kts
Sea-level pressure: 30.13 ins. Hg, falling, then more quickly
Visibility: 40 miles, except 20 miles SW-NNE, distant haze in all
directions
6-hr Max temp: 73F
6-hr Min temp: 60F
BHO SA 1755 140 SCT E250 BKN 40 202/73/64/1708/013/ FEW CU ALQDS
VSBY SW-NNE 20 DSNT HZ ALQDS/ 8/131 58017 10073 20060
SUMMARY FOR FRIDAY, OCTOBER 6, 2017
TEMPERATURE (DEGREES F)
MAX…..73 NORMAL…..64
MIN…..57 NORMAL…..47
MEAN….65 NORMAL…..55
DEPARTURE FROM 30-YEAR NORMAL……………………+10
TOTAL DEPARTURE FOR THE MONTH……………………+30 [+4.8 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0 DEPARTURE………..0
TOTAL COOLING UNITS FOR THE MONTH……………5 DEPARTURE……….+3
TOTAL COOLING UNITS FOR THE SEASON…………712 DEPARTURE……..+113
TOTAL COOLING UNITS LAST SEASON TO DATE…….894 DEPARTURE……..-182
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0 DEPARTURE………-10
TOTAL HEATING UNITS FOR THE MONTH…………..28 DEPARTURE………-28
TOTAL HEATING UNITS FOR THE SEASON…………121 DEPARTURE………-77
TOTAL HEATING UNITS LAST SEASON TO DATE…….129 DEPARTURE……….-8
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….15 NW AT 3:23 P.M.
AERO……………………14 NW AT 3:45 P.M.
ASOS……………………16 NW AT 3:22 P.M.
DAVIS………………….N/A RMY 15
FASTEST MILE FOR YESTERDAY…………………11 WNW AT 1:59 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………12 NW AT 3:46 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….N/A
AVERAGE WIND SPEED AND DIRECTION…………..6.5 NW
ASOS…………………..7.0
DAVIS………………….N/A
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00 DEPARTURE……-0.15
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.00 DEPARTURE……-0.89
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE YEAR……….41.86 DEPARTURE……+1.89
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings
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
9/1 68/47/58/-10/0.00/749/95 26 WNW AERO 28 WNW RMY 31
9/2 72/46/59/-9/0.00/542/69 18 NNW AERO 18 NNW RMY 21
9/3 63/52/58/-9/0.24/000/00 33 W AERO 33 W RMY 37
9/4 79/55/67/0/0.00/702/90 29 SSW AERO 28 SSW RMY N/A
9/5 84/62/73/+6/0.00/583/75 36 S AERO 32 S RMY 38
9/6 76/59/68/+1/0.49/070/09 28 S AERO 28 S RMY 30 TSTM
9/7 74/58/66/0/0.79/417/54 24*WSW AERO 23 WSW RMY 24
9/8 74/53/64/-2/0.00/577/75 21 WSW AERO 18 WSW RMY 22
9/9 68/51/60/-6/T/620/81 18 ENE AERO 16 ENE RMY 18
9/10 71/51/61/-4/0.00/694/91 18 NW AERO 16 NW RMY N/A
9/11 78/50/64/-1/0.00/692/91 20 NNW AERO 17 NNW RMY 20
9/12 84/58/71/+6/0.00/690/91 22 WSW AERO 18 WSW RMY 23
9/13 84/59/72/+8/T/680/90 18 WSW AERO 15 WSW RMY 20 TSTM
9/14 82/66/74/+10/0.00/233/31 23 SW AERO 23 WSW RMY 25 TSTM
9/15 83/66/75/+11/0.05/300/40 18 WNW AERO 15 WNW RMY 18
9/16 78/65/72/+9/T/261/35 14 E AERO 9 E RMY 12
9/17 79/61/70/+7/T/334/45 15 SSE AERO 14 SSE RMY 15
9/18 67/62/65/+3/0.02/000/00 21 NE AERO 18 NE RMY N/A
9/19 63/61/62/0/0.13/000/00 28 NE* AERO 25 NNE RMY N/A
9/20 68/62/65/+3/0.67/000/00 41 NNE AERO 44 NNE RMY 45
9/21 69/60/65/+4/0.01/242/33 47 NNE AERO 44 NNE RMY 50
9/22 60/54/57/-4/0.56/000/00 40 NNE AERO 38 NNE RMY N/A
9/23 74/59/67/+7/0.21/421/58 29 NNE AERO 29 NNE RMY N/A
9/24 85/63/74/+14/0.00/688/95 16 N AERO 14 N* RMY N/A
9/25 86/66/76/+16/0.00/671/93 15 ESE*AERO 13 ESE RMY 14
9/26 84/66/75/+16/0.00/503/70 15 SW AERO 12 SW* RMY 14
9/27 86/64/75/+16/0.00/551/77 21 S AERO 20 S RMY 22
9/28 75/52/64/+6/0.00/605/85 29 NNW AERO 30 NNW RMY 33
9/29 65/46/56/-2/0.00/681/96 21 NNW AERO 20 NNW RMY N/A
9/30 56/44/50/-8/2.33/000/00 28 NE AERO 25 ENE RMY 27 TSTM
DAILY RECORDS FOR SEPTEMBER
9/1/17: DAILY RECORD LOW MINIMUM TEMPERATURE OF 47F,
TIES PREVIOUS RECORD SET IN 1975
9/27/17: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 86F,
BREAKS PREVIOUS RECORD SET IN 1998 AND TIED IN 2014
PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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
10/1 65/42/54/-3/0.00/…/.. 18 WNW AERO 16 NW RMY N/A
10/2 65/46/56/-1/0.00/…/.. 21 NNW AERO 21 NNW RMY 21
10/3 67/50/59/+3/0.00/…/.. 21 S AERO 21 S RMY N/A
10/4 75/50/63/+7/0.00/…/.. 30 SSW AERO 30 SW RMY 32
10/5 79/60/70/+14/0.00/…/.. 28 SW AERO 26 SW RMY N/A
10/6 73/57/65/+10/T/…/.. 15 NW AERO 14 NW RMY 15
10/7 Low temp since midnight is 59F; normal low is now 46F
DAILY RECORDS FOR OCTOBER
None so far.
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR OCTOBER 7
HIGH 88F IN 1963 (RECORD FOR MONTH)
LOW 30F IN 1904,1986
PRECIP 1.75 INCHES IN 1972
PEAK GUST 54 W IN 2009
RECORDS FOR OCTOBER 8
HIGH 81F IN 1916,1990
LOW 28F IN 1919
PRECIP 2.31 INCHES IN 1891
SNOWFALL TRACE IN 1988, 2001 (EARLIEST DATE)
PEAK GUST 60 MPH NE IN 1996
TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle
