Saturday, October 3, 2015
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, OCTOBER 3, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME
COLD AND RAINY THIS MORNING WITH GUSTY NE WINDS…
A cold rain continued much of this morning, before ending
just before mid-day. A total of 0.15 inches was measured
in the six hours ending at 1 PM EST today, and a total of
0.51 has been observed since Thursday evening.
Very cool temperatures have continued for the last few days
with the onshore flow with a high temperature of only 51F
on Friday and 50F so far today. The minimum temperature this
morning was 45F around 11 AM EST. The wind has been gusty
from the NE with a peak gust during the rain this morning
to 36 mph at 10:42 AM EST. This was surpassed with a peak
gust to 37 mph NE at 2:47 PM EST.
The rain and fog earlier today kept the visibility in the
2-e mile range much of the morning, though drier air to the
north began to move in as the rain ended. This increased
the visibility to 35-40 miles and better than 75 miles to
the NW by early afternoon.
September 2015 was the warmest September on record here at Blue
Hill Observatory. It also featured the slowest mean wind speed
on record for September, the warmest September average maximum
temperature and second warmest average minimum temperature.
August-September combined was also the warmest on record.
September was the fifth sunniest on record with 70 percent of
the possible bright sunshine, and August-September combined
was the sunniest on record with 72 percent sunshine for those
two months.
Details below:
BHO Warmest Septembers (NWS mean), deg F (1885-2015):
1) 68.2 in 2015
2) 66.9 in 1961
3) 66.5 in 1930
4) 66.4 in 1999
5) 66.2 in 2002
66.2 in 2005
BHO Warmest September Average Maximum Temperature, deg F (1885-2015):
1) 77.8 in 2015
2) 76.6 in 1930
3) 75.7 in 2007
4) 75.6 in 1959
5) 75.5 in 1961
BHO Warmest September Average Minimum Temperature, deg F (1885-2015):
1) 58.8 in 1988
2) 58.5 in 2015
3) 58.2 in 1961
58.2 in 1999
5) 57.8 in 2005
BHO Warmest Aug-Sep (24-hour adjusted mean), deg F (1885-2015):
1) 69.8 in 2015
2) 68.9 in 2005
3) 68.6 in 2002
4) 68.2 in 2010
5) 67.8 in 1959
BHO Slowest September Mean Wind Speed, mph (1885-2015):
1) 10.3 in 2015
2) 10.5 in 2014
3) 10.6 in 2013
4) 10.7 in 2011
5) 10.9 in 1917
10.9 in 2003
BHO Sunniest Septembers, hours (1885-2015):
1) 267.7 in 1983 [74%] 2) 266.9 in 1941 [74%] 3) 265.9 in 2007 [74%] 4) 255.3 in 1948 [71%] 5) 251.9 in 2015 [70%] 6) 251.0 in 1967 [70%] 7) 246.8 in 1952 [69%] 246.8 in 1978 [69%]
BHO Sunniest Aug-Sep, hours (1885-2015):
1) 555.1 in 2015 [72%] 2) 553.0 in 1941 [72%] 3) 536.0 in 2007 [69%] 4) 527.3 in 2014 [68%] 5) 520.2 in 1932 [67%] 6) 515.3 in 1921 [67%] 7) 514.3 in 1968 [67%]
PRELIMINARY STATS FOR SEPTEMBER 2015
TEMPERATURE, Deg. F
Avg. Max. 77.8 [+6.2]
Avg. Min. 58.5 [+3.9]
Mean 68.2 [+5.1]
Corrected mean: 67.3
Max. for month: 97 on 8th
Min. for month: 46 on 27th
COOLING DEGREE DAYS
Total cooling units: 144 [+84]
Total for the season: 810 [+213]
Total for last season: 587
HEATING DEGREE DAYS
Total heating units: 42 [-75]
Total for the season: 43 [-99]
Total for last season: 101
PRECIPITATION, Inches
Total: 3.88 [-0.18]
Greatest in 24 hrs: 2.53 inches from 9/29-30
WIND, mph
Avg. uncorrected wind speed: 10.1
Avg. corrected wind speed: 10.3
Prevailing wind direction: SSW @ 13%
Peak gust and direction: 47 S on the 30th
SUNSHINE:
Campbell-Stokes card minutes: 15114 mins. of possible 21582 or 70%
Astronomical total minutes: 15766 mins. of possible 22472 or 70%
Today’s Observations:
7 A.M.
Weather: Sky partly obscured in light rain and fog, overcast
stratocumulus and nimbostratus
Temperature: 46F; Dew Point: 46F; Wind: NE at 15G24 kts,
Sea-level pressure: 30.40 ins. Hg, pressure rising, then more quickly
Visibility: 2 miles
6-hr Max temp: 49F
6-hr Min temp: 46F
24-hr precip: 0.31 inches
BHO SA 1155 -X E3 OVC 2R-F 293/46/46/0415G24/040/ F1 PK WND
0426/12/ 8/72/ 53014 60/// 70031 10049 20046
10 A.M.
Weather: Light rain and fog, overcast stratocumulus and nimbostratus
Temperature: 46F; Dew Point 45F; Wind: NE at 17G27 kts,
Peak Wind: 27 knots NE at 9:31 AM EST
Sea-level pressure: 30.43 ins. Hg, rising, then more slowly
Visibility: 3 miles, variable 2-4 miles
3-hr precip: 0.12 inches
BHO SA 1455 E5 OVC 3VR-F 305/46/45/0417G27/043/ VSBY 2V4
PK WND 0427/31/ 8/6// 51012 6012/
1 P.M.
Weather: Overcast stratocumulus
Temperature: 47F; Dew Point: 43F; Wind: NE at 17G26 kts
Peak Wind: 30 knots NE at 11:58 AM EST
Sea-level pressure: 30.42 ins. Hg, decreasing then increasing,
now lower
Visibility: 40 miles, except 25 miles E-SE, 75 miles WNW-NW
6-hr Max: 47F
6-hr Min: 45F
6-hr precip: 0.15 inches
BHO SA 1755 E20 OVC 40 302/47/43/0417G26/042/ VSBY E-SE 25
WNW-NW 75 PK WND 0530/58/ 8/5// 55003 6015/ 10047 20045
SUMMARY FOR FRIDAY, OCTOBER 2, 2015
TEMPERATURE (DEGREES F)
MAX…..51 NORMAL…..65
MIN…..47 NORMAL…..48
MEAN….49 NORMAL…..57
DEPARTURE FROM 30-YEAR NORMAL……………………-8
TOTAL DEPARTURE FOR THE MONTH…………………..-12 [-6.2 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0 DEPARTURE………..0
TOTAL COOLING UNITS FOR THE MONTH……………0 DEPARTURE……….-1
TOTAL COOLING UNITS FOR THE SEASON…………810 DEPARTURE……..+212
TOTAL COOLING UNITS LAST SEASON TO DATE…….587 DIFFERENCE…….+223
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..16 DEPARTURE……….+7
TOTAL HEATING UNITS FOR THE MONTH…………..28 DEPARTURE………+11
TOTAL HEATING UNITS FOR THE SEASON………….71 DEPARTURE………-88
TOTAL HEATING UNITS LAST SEASON TO DATE…….124 DIFFERENCE……..-53
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….40 NE AT 7:16 P.M.
ASOS……………………43 NE AT 7:15 P.M.
DAVIS…………………..42 NE AT 7:15 P.M. RMY 43
FASTEST MILE FOR YESTERDAY……………….. 28 NE AT 9:57 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………26 NE AT 11:37 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..26 NE AT 6:28 P.M.
AVERAGE WIND SPEED AND DIRECTION………….18.1 NE
ASOS………………….16.9
DAVIS…………………15.6 NE [047 DEG]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.31 DEPARTURE…..+0.16
ASOS……………0.30
TOTAL PRECIPITATION FOR THE MONTH………..0.37 DEPARTURE…..+0.06
ASOS……………0.35
TOTAL PRECIPITATION FOR THE YEAR………..34.19 DEPARTURE…..-4.88
ASOS…………….N/A ***
*** ASOS annual total not available due to erroneous readings
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER & OCTOBER CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY 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
9/1 81/65/73/+5/0.00/766/97 20 SSW RMY 20
9/2 89/64/77/+9/0.00/732/93 20 SW RMY 21
9/3 85/66/76/+9/T/612/78 17 E RMY N/A TSTM
9/4 72/58/65/-2/0.00/297/38 31 ENE RMY N/A
9/5 77/55/66/-1/0.00/748/96 14 SW RMY 18
9/6 87/57/72/+5/0.00/753/97 21 SSW RMY 22
9/7 92/63/78/+12/0.00/727/94 23 WSW RMY 24
9/8 97/70/84/+18/0.00/693/90 22 WSW RMY 24
9/9 92/70/81/+15/0.00/683/89 30 SSW RMY 33
9/10 73/62/68/+3/0.32/000/00 29 NE RMY N/A
9/11 70/59/65/0/0.59/084/11 33 NE RMY N/A
9/12 75/58/67/2/…./380/50 18 SSE RMY 25
9/13 66/60/63/-1/…./000/00 25 E RMY N/A
9/14 70/53/62/-2/0.00/550/73 33 W RMY 35
9/15 82/56/69/+5/0.00/736/98 23 W RMY N/A
9/16 84/62/73/+10/0.00/711/95 17 NW RMY N/A
9/17 87/64/76/+13/0.00/723/97 17 SW RMY 16
9/18 86/64/75/+13/0.00/712/96 21 SSW RMY 21
9/19 80/62/71/+9/0.00/480/65 22 S RMY N/A
9/20 74/55/65/+3/T/552/75 24 S RMY N/A
9/21 65/50/58/-3/0.00/646/88 29 ENE RMY 30
9/22 67/55/61/+0/0.00/183/25 21 E RMY 21
9/23 72/50/61/+1/0.00/677/93 15 E RMY N/A
9/24 72/56/64/+4/0.00/696/96 22 E RMY 21
9/25 66/53/60/0/0.00/556/77 21 E RMY 20
9/26 63/49/56/-3/0.00/633/88 25 ENE RMY 25
9/27 71/46/59/+0/0.00/688/96 17 S RMY 18
9/28 81/57/69/+11/0.00/428/60 22 SSW RMY 24
9/29 82/65/74/+16/…./320/45 28 S RMY N/A
9/30 75/53/64/+6/…./000/00 47 S RMY 51 TSTM
10/1 55/51/53/-4/…./…/.. 39 NE RMY N/A
10/2 51/47/49/-8/…./…/.. 40 NE RMY 43
10/3 low since midnight is 45F; normal low is now 48F
DAILY RECORDS FOR SEPTEMBER & OCTOBER 2015
**9/7 DAILY RECORD MAXIMUM TEMPERATURE OF 92F
TIES PREVIOUS RECORD SET IN 2007**
**9/8 DAILY RECORD MAXIMUM TEMPERATURE OF 97F
BREAKS PREVIOUS RECORD OF 93F SET IN 2007**
**9/8 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 70F
BREAKS PREVIOUS RECORD OF 69F SET IN 1999**
**9/9 DAILY RECORD MAXIMUM TEMPERATURE OF 92F
BREAKS PREVIOUS RECORD OF 91F SET IN 2002**
**9/9 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 70F
BREAKS PREVIOUS RECORD OF 69F SET IN 1999**
**9/17 DAILY RECORD MAXIMUM TEMPERATURE OF 87F
BREAKS PREVIOUS RECORD OF 86F SET IN 1915, 1941, AND 1991**
**9/18 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 64F
TIES PREVIOUS RECORD SET IN 1992**
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR OCTOBER 3
HIGH 82F IN 1922
LOW 28F IN 1899
PRECIP 1.76 INCHES IN 1979
PEAK GUST 62 MPH WNW IN 1964
RECORDS FOR OCTOBER 4
HIGH 84F IN 2007
LOW 28F IN 1888
PRECIP 1.87 INCHES IN 2011
PEAK GUST 59 MPH SSW IN 1990
TODAY’S REPORT PREPARED BY: Mike Iacono
