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BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, AUGUST 1, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME
JULY ENDS WARMER, DRIER AND SUNNIER THAN AVERAGE…
SHOWERS AND THUNDERSHOWERS FORMING IN THE AREA TODAY…
The low temperature remained in the upper 60s once
again with moderate humidity and dew points near 60F.
Nearly full sunshine earlier has allowed cumulus to
build into cumulonimbus as of the 1 PM EST observation.
One TRW was seen at that time to the northeast moving
across the north shore with distant cloud to ground
lightning visible in that direction for a short time.
Other storms formed east and south of the summit and
moved offshore. As of 2 PM EST, another line of TRW
is forming inland and moving toward the coast.
PRELIMINARY STATS FOR JULY 2015
TEMPERATURE, Deg. F
Avg. Max. 82.2 [+1.4]
Avg. Min. 63.6 [+0.7]
Mean 72.9 [+1.0]
Corrected mean: 72.4
Max. for month: 92 on 29th
Min. for month: 56 on 16th, 17th
HEATING DEGREE DAYS
Total heating units: 1 [-8]
Total for the season: 1 [-8]
Total for last season: 0
COOLING DEGREE DAYS
Total cooling units: 256 [+34]
Total for the season: 394 [+43]
Total for last season: 337
PRECIPITATION, Inches
Total: 3.09 [-0.93]
Greatest in 24 hrs: 2.03, 9-10th
WIND, mph
Avg. uncorrected wind speed: 9.6
Avg. corrected wind speed: 10.2
Prevailing wind direction: S @ 14%
Peak gust and direction: 35 S on the 7th
SUNSHINE:
Campbell-Stokes card minutes: 16452 / 26682 or 62%
Astronomical total minutes: 17101 / 27760 or 62%
Today’s Observations:
7 A.M.
Weather: Scattered altocumulus, few altocumulus lenticularis
ENE-ESE, few altocumulus castellanus distant E-S and distant
W-WNW, hazy
Temperature: 73F; Dew Point: 59F; Wind: WSW at 10 kts
Sea-level pressure: 29.77 ins. Hg, decreasing then increasing,
same as three hours ago
Visibility: 40 miles, hazy
6-hr Max temp: 72F
6-hr Min temp: 69F
24-hr precip: 0.10 inches
BHO SA 1155 120 SCT 40 082/73/59/2410/977/ FEW ACSL ENE-ESE
FEW ACCAS DSNT E-S AND DSNT W-WNW HAZY/ 8/080 55000 10072
20069
10 A.M.
Weather: Scattered altocumulus, thin scattered cirrus, few
cumulus and cumulus fractus E-S, few altocumulus castellanus
distant W-NW, hazy
Temperature: 82F; Dew Point 60F; Wind: W at 9G15 kts
Sea-level pressure: 29.77 ins. Hg, falling
Visibility: 50 miles, hazy
BHO SA 1455 120 SCT 180 SCT 250 -SCT 50 081/82/60/2609G15/977/
FEW CU/CUFRA E-S FEW ACCAS DSNT W-NW HAZY/ 8/131 58001
1 P.M.
Weather: Scattered cumulus and cumulonimbus, scattered
altocumulus, broken cirrus fibratus radiatus, cumulonimbus
NE moving NW, occasional distant cloud to ground lightning NE,
towering cumulus distant NW moving NE, moderate cumulus
all quadrants, cirrus radiatus W-NNW, rain shower distant NW
and E moving NE, rain shower SSE-S moving NE, hazy
Temperature: 84F; Dew Point: 61F; Wind: W at 13G19 kts
Sea-level pressure: 29.74 ins. Hg, falling, then more rapidly
Visibility: 40 miles, visibility WSW-W 50, NE 25, SSE-S 10
6-hr Max temp: 87F
6-hr Min temp: 73F
BHO SA 1755 55 SCT E100 BKN 300 BKN 40 071/84/61/2713G19/974/
CB NE MVNG NE OCNL DSNT LTG CG NE TCU DSNT NW MVNG NE MDT CU
ALQDS CI RADIATUS W-NNW RW DSNT NE AND E MVNG NE RW SSE-S MVNG
NE VSBY WSW-W 50 NE 25 SSE-S 10 HAZY/ 8/261 58010 10087 20073
SUMMARY FOR FRIDAY, JULY 31, 2015
TEMPERATURE (DEGREES F)
MAX…..87 NORMAL…..81
MIN…..68 NORMAL…..63
MEAN….78 NORMAL…..72
DEPARTURE FROM 30-YEAR NORMAL……………………+6
TOTAL DEPARTURE FOR THE MONTH…………………..+47 [+1.3 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..13 DEPARTURE……….+6
TOTAL COOLING UNITS FOR THE MONTH………….256 DEPARTURE………+34
TOTAL COOLING UNITS FOR THE SEASON…………394 DEPARTURE………+43
TOTAL COOLING UNITS LAST SEASON TO DATE…….337 DIFFERENCE……..+57
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….28 W AT 11:52 A.M.*
ASOS……………………31 W AT 11:16 A.M.
DAVIS…………………..26 SW AT 11:26 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………23 W AT 11:51 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………23 W AT 11:53 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..18 WSW AT 11:24 A.M.
AVERAGE WIND SPEED AND DIRECTION………….12.2 WSW
ASOS………………….12.0
DAVIS………………….8.6 WSW [251 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 THE MONTH………..3.09 DEPARTURE…..-0.93
ASOS……………3.09
TOTAL PRECIPITATION FOR THE YEAR………..27.36 DEPARTURE…..-3.63
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings
PRELIMINARY CLIMATE SUMMARY FOR JULY 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
7/1 80/63/72/+2/0.59/466/51 30 SSE RMY 33 TSTM
7/2 78/60/69/-1/0.00/721/79 23 WNW RMY N/A
7/3 79/58/69/-2/0.00/867/95 17 SSW RMY 17
7/4 74/61/68/-3/T/109/12 16 S RMY N/A
7/5 82/58/70/-1/0.00/865/95 20 WSW RMY 20
7/6 85/64/75/+4/0.00/755/83 20 S RMY 21
7/7 84/65/75/+4/0.02/445/49 35 S RMY 40
7/8 87/68/78/+6/T/372/41 23 NE RMY N/A
7/9 73/61/67/-5/0.08/390/43 24 NE RMY 25
7/10 80/59/70/-2/1.95/535/59 18 W RMY N/A TSTM
7/11 84/61/73/+1/0.00/868/96 21 NW RMY 19
7/12 88/67/78/+6/0.00/813/90 20 W RMY 17
7/13 82/66/74/+2/0.00/424/47 21 E RMY 20
7/14 81/64/73/+1/…./396/44 25 S RMY 27
7/15 84/61/73/+1/…./297/33 24 ENE RMY 26
7/16 72/56/64/-8/0.00/852/95 25 NNE RMY 24
7/17 79/56/68/-4/0.00/708/79 21 S RMY N/A
7/18 76/63/70/-2/0.16/027/03 29 SSW RMY 30 TSTM
7/19 89/68/79/+7/0.01/509/57 25 SSW RMY 27
7/20 90/73/82/+10/0.00/793/89 24 W RMY 26
7/21 87/70/79/+7/T/267/30 24 W RMY 25
7/22 82/64/73/+1/T/727/82 24 WNW RMY 26
7/23 81/62/72/+0/0.00/753/85 22 W RMY 23
7/24 80/60/70/-2/T/663/75 23 N RMY 25
7/25 71/59/65/-7/0.00/265/30 20 ENE RMY N/A
7/26 78/59/69/-3/T/018/02 24 SSE RMY 25 TSTM
7/27 84/67/76/+4/T/378/43 24 S RMY N/A TSTM
7/28 89/68/79/+7/0.00/604/69 18 S RMY N/A
7/29 92/70/81/+9/0.00/830/95 21 W RMY N/A
7/30 89/72/81/+9/0.10/514/59 31 S RMY N/A
7/31 87/68/68/+6/0.00/870/100 28 W RMY N/A
8/1 low since midnight is 69F; normal low is now 63F
DAILY RECORDS FOR JULY 2015
7/10 – RECORD DAILY PRECIPITATION OF 1.95 INCHES,
surpasses previous record of 1.68 in. in 1933
7/20 – RECORD DAILY HIGH MINIMUM TEMPERATURE OF 73F,
ties previous record of 73F in 1977
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 50F IN 1929, 1947
PRECIP 1.59 INCHES IN 1946
PEAK GUST 50 MPH SW IN 2006
TODAY’S REPORT PREPARED BY: Mike Iacono
