Thursday, August 1, 2013

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, AUGUST 1, 2013
ALL TIMES ARE IN EASTERN STANDARD TIME

JULY 2013 PRELIMINARY STATISTICS: (departures relative to 1981-2010 average)

TEMPERATURE:
Average Max Temp: 83.2F [+2.4F] Average Min Temp: 66.9F [+4.0F] Mean Temp: 75.1F [+3.2F] 24-hr. Corr. Mean Temp: 74.1F [+3.3F] Max Temp: 95F on 19th
Min Temp: 57F on 25th

Total heating degree day units (month): 6 [-3] *NCDC method
Total heating degree day units (season): 6 [-3] *start July 1 (NCDC)
Total cooling degree day units (month): 327 [+105] *NCDC method
Total cooling degree day units (season): 483 [+132] *start Jan 1 (NCDC)

PRECIPITATION:
Total precipitation: 3.09 inches [-0.93 inch] Greatest 24-hr precipitation: 1.03 on 25th/26th

WIND:
Avg wind speed: 9.5 MPH
Avg corrected wind speed: 10.1 MPH
Prevailing wind direction: SW [12%] Peak gust: 38 MPH SSW on 7th
Peak fastest mile: 32 MPH SSW on 7th

SUNSHINE:
Astronomical minutes: 14,428 of a possible 27,729 or 52%

BHO Warmest July’s, deg F (1885-2013)
1) 75.1 in 2010
2) 74.9 in 1952
3) 74.1 in 1994
74.1 in 2013
5) 74.0 in 2011
6) 73.8 in 1999
7) 73.5 in 1949
8) 73.2 in 2012

The average maximum of 83.2 is 13th warmest, but the average minimum
of 66.9 is the WARMEST on record for July and for any month of the year.
The breaks the previous record of 65.9 in 2010 by an entire degree F.
The ranking below is the same for July and for all months of the year,
since the warmest average minimum in any other month is the August record
of 64.9.

BHO Warmest July Average Minimum Temperature, deg F (1885-2013)
1) 66.9 in 2013
2) 65.9 in 2010
3) 65.6 in 1994
4) 65.3 in 2006
5) 65.1 in 2008

BHO Greatest Number of 90-Degree Days per Month, (1885-2013)
1) 14 in July 1952
2) 13 in August 2002
3) 10 in August 1944
10 in July 1949
10 in July 1963
10 in July 2010
10 in July 2013
8) 9 in July 1911
9 in August 1928
10) 8 in August 1949
8 in July 1963
8 in July 1988

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, lenticularis all quadrants,
thin scattered cirrus
Temperature: 69F; Dew Point: 64F; Wind: S at 5 kts,
Sea-level pressure: 30.03 ins. Hg, rising slightly
Visibility: 20 miles, except 15 miles SW-NW, thin fog and hazy
6-hr min. temp: 62F
BHO SA 1155 180 SCT 220 –SCT 250 –SCT 20 170/69/64/1705/003/ ACSL ALQDS
VSBY SW-NW 15 THN F HAZY ALQDS/ 8/041 53001 10067 20062

10 A.M.
Weather: Scattered cumulus, moderate cumulus, scattered altocumulus,
few lenticularis
Temperature: 77F; Dew Point: 61F; Wind: S at 4 kts,
Wind: Light and variable
Sea-level pressure: 30.00 ins. Hg, falling then more rapidly
Visibility: 30 miles, distant haze,
BHO SA 1455 35 SCT 180 SCT 30 158/77/61/1704/000/ CU/MDT CU ALQDS
FEW ACSL DSNT HZ WND L/V/ 8/240 58012

1 P.M.
Weather Scattered cumulus, broken moderate cumulus, broken altocumulus,
altocumulus lenticularis (2 levels), overcast mostly thin cirrus at
22,000 ft.
Temperature: 81F; Dew Point: 62F; Wind: S at 10 kts
Wind: Direction variable SSE to SSW
Sea-level pressure: 29.96 ins. Hg, falling then more slowly
Visibility: 40 miles, distant haze
6-hr max. temp: 81F
BHO SA 1755 42 SCT E55 BKN 130 BKN 220 OVC 40 144/81/62/1810/996/ MDT CU
ALQDS DRK BASES ACSL/FEW ACCG 220 LYR MSTLY THN WND 15V21/ 8/241 56014
10081 20069

WEATHER SUMMARY FOR WEDNESDAY, JULY 31, 2013

TEMPERATURE (DEGREES F)
MAX…..80 NORMAL…..81
MIN…..61 NORMAL…..63
MEAN….71 NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL…………………-1
TOTAL DEPARTURE FOR THE MONTH……………….+113 [+3.4 DEGREES/DAY]

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY…………….16 S AT 9:04 P.M.
AERO…………………15 S AT 9:04 P.M.
ASOS…………………19 S AT 9:04 P.M.
DAVIS………………..15 S AT 9:03 P.M. RMY 16
FASTEST MILE FOR YESTERDAY………………11 SSE AT 8:10 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE……………12 S AT 9:05 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………..11 S AT 9:05 P.M.
AVERAGE WIND SPEED AND DIRECTION………..6.7 WNW
ASOS………………..6.2
DAVIS……………….6.2 W [280 deg.] * last of several occurrences…

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 JULY……………3.09 DEPARTURE…………-0.93
ASOS…………..3.05
TOTAL PRECIPITATION FOR THE YEAR……….35.29 DEPARTURE…………+4.30
ASOS…………..N/A*
*ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals

PRELIMINARY CLIMATE SUMMARY FOR JULY 2013 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust
RMY: RMY = R.M. Young wind gust recording system added 8/9/2011
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized

7/1 82/69/76/+6/0.05/247/27 29 S AERO 31 MPH SSW RMY 32
7/2 82/61/72/+2/T/100/11 23 SSW AERO 23 MPH SSW RMY 25
7/3 87/62/75/+4/T/556/61 28 SW AERO 30 MPH SW RMY 30
7/4 90/71/81/+10/0.00/811/89 25 WSW AERO 26 MPH SW RMY 28
7/5 92/73/83/+12/0.00/874/96 24 W AERO 25 MPH WSW RMY 25
7/6 90/73/82/+11/0.00/836/92 25 WNW AERO 25 MPH WNW RMY 26
7/7 91/72/82/+11/0.21/508/56 38 SSW AERO 43 MPH SSW RMY 44 TSTM
7/8 82/64/73/+1/0.04/617/68 18 NE AERO 20 MPH NE RMY 20 TSTM
7/9 72/63/68/-4/0.01/054/06 14 ENE AERO 14 MPH ENE RMY 14
7/10 84/65/75/+3/T/335/37 32 S AERO 36 MPH S RMY 35
7/11 79/69/74/+2/0.62/009/01 23 W AERO 23 MPH W RMY N/A TSTM
7/12 70/62/66/-6/0.00/162/18 29 NE AERO 29 MPH NE RMY 30
7/13 75/62/69/-3/0.08/009/01 21 ENE AERO 20 MPH ENE RMY N/A
7/14 89/71/80/+8/0.00/477/53 16 W AERO 16 MPH W RMY 16
7/15 91/72/82/+10/0.00/665/74 17 NW AERO 16 MPH NW RMY 18
7/16 91/71/81/+9/0.00/843/94 18 NNW AERO 16 MPH NNW RMY 16
7/17 93/74/84/+12/0.00/841/94 22 SW AERO 23 MPH SW RMY 25
7/18 90/75/83/+11/0.00/724/81 20 S AERO 21 MPH S RMY 22
7/19 95/76/86/+14/0.00/723/81 36 WSW AERO 38 MPH WSW RMY 38
7/20 93/72/82/+10/0.00/570/64 29 W AERO 30 MPH W RMY 31 TSTM
7/21 82/68/75/+3/0.00/568/64 16 NE AERO 16 MPH NE RMY 17
7/22 80/67/74/+2/T/514/58 17 NE AERO 17 MPH NE RMY 19 TSTM
7/23 82/68/75/+3/0.82/159/18 35 WSW AERO 36 MPH WSW RMY 39
7/24 84/64/74/+2/0.00/627/71 23 N AERO 23 MPH N RMY 23
7/25 64/57/61/-11/0.43/000/00 24 NNE AERO 24 MPH NNE RMY 25
7/26 67/59/63/-9/0.70/000/00 23 NNW AERO 23 MPH N RMY 23
7/27 82/60/71/-1/0.00/535/61 22 S AERO 23 MPH S RMY 23
7/28 78/66/72/0/0.03/149/17 16 ENE AERO 16 MPH ENE RMY 15
7/29 81/66/74/+2/0.10/…/.. 20 S AERO 18 MPH S RMY 21 TSTM
7/30 81/61/71/-1/0.00/…/.. 20 WNW AERO 18 MPH WNW RMY 20
7/31 80/61/71/-1/0.00/…/.. 16 S AERO 15 MPH S RMY 16

8/1 morning low temp: 62F; the normal low is now 63F

DAILY RECORDS FOR JULY 2013
7/14 – TIED DAILY RECORD HIGH MINIMUM TEMPERATURE OF 71F;
ties previous record of 71F set in 1997
7/15 – NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 72F;
surpasses previous record of 70F set in 1901, 1934, 1995
7/16 – TIED DAILY RECORD HIGH MINIMUM TEMPERATURE OF 71F;
ties previous record of 71F set in 1901, 1958, 1968
7/17 – TIED DAILY RECORD HIGH MINIMUM TEMPERATURE OF 74F;
ties previous record of 74F set in 1900
7/18 – NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 75F;
surpasses previous record of 73F set in 1900, 1999
7/19 – NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 76F;
surpasses previous record of 72F set in 1949, 1991, 2005

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR AUGUST 1
HIGH 97F IN 1917
LOW 49F IN 1891
PRECIP 3.61 INCHES IN 1927
PEAK GUST 41 MPH NNW IN 1985

RECORDS FOR AUGUST 2
HIGH 101F IN 1975 [STATION RECORD MAXIMUM – Tied with 8/10/1949] LOW 50 IN 1929, 1947
PRECIP 1.59 INCHES IN 1946
PEAK GUST 50 MPH SW IN 2006

TODAY’S REPORT PREPARED BY: Robert Skilling/Marc Douglas/Mark Medlinskas