Thursday, September 17, 2015
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, SEPTEMBER 17, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME
RECORD HEAT BUILDS TODAY AS WARM, DRY
STRETCH CONTINUES – DAILY RECORD TIED
AT 1:00 PM EST OBSERVATION
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Yesterday’s maximum temperature of 84F ended up being seven
degrees lower than the daily record for the 16th; however,
as heat built today, the daily record of 86F, set in 1915,
1941 and 1991, was tied by the 1:00 PM EST observation.
Dry conditions have prevailed once more today, with a monthly
precipitation deficit nearing 3/4 of an inch after yesterday.
Additionally, the annual deficit crept close to 5.50 inches
drier than normal.
Today’s Observations:
7 A.M.
Weather: Clear, few cirrus distant N-WSW
Temperature: 66F; Dew Point: 58F; Wind: WSW at 10 kts,
Sea-level pressure: 30.17 ins. Hg, rising, then falling and lower
Visibility: 60 miles, light distant haze, light smoke layer in all
directions
6-hr Max temp: 66F
6-hr Min temp: 64F
24-hr precip: 0.00 in.
BHO SA 1155 CLR 60 217/66/58/2510/017/ FEW CI DSNT N-WSW LGT K LYR
ALQDS LGT DSNT HZ ALQDS/ 8/001 58001 10066 20064
10 A.M.
Weather: Clear, few cirrus distant SE-SW
Temperature: 79F; Dew Point 60F; Wind: estimated W at 5 kts,
Wind Speed: Light
Sea-level pressure: 30.17 ins. Hg, steady, then falling slightly
Visibility: 50 miles, light distant haze
BHO SA 1455 CLR 50 216/79/60/E2705/017/ FEW CI DSNT SE-SW LGT DSNT
HZ ALQDS WND LGT/ 8/001 58001
1 P.M.
Weather: Clear, few cirrus distant ESE-SW
Temperature: 86F; Dew Point: 57F; Wind: SSW at 7 kts
Sea-level pressure: 30.11 ins. Hg, falling, then more quickly
Visibility: 60 miles, light distant haze
6-hr Max: 86F
6-hr Min: 66F
BHO SA 1755 CLR 60 195/86/57/2107/011/ FEW CI DSNT ESE-SW LGT DSNT
HZ ALQDS/ 8/001 58021 10086 20066
SUMMARY FOR WEDNESDAY, SEPTEMBER 16, 2015
TEMPERATURE (DEGREES F)
MAX…..84 NORMAL…..72
MIN…..62 NORMAL…..55
MEAN….73 NORMAL…..63
DEPARTURE FROM 30-YEAR NORMAL…………………..+10
TOTAL DEPARTURE FOR THE MONTH…………………..+88 [+5.3 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………8 DEPARTURE……….+6
TOTAL COOLING UNITS FOR THE MONTH………….104 DEPARTURE………+59
TOTAL COOLING UNITS FOR THE SEASON…………770 DEPARTURE……..+188
TOTAL COOLING UNITS LAST SEASON TO DATE…….565 DIFFERENCE…….+205
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….17 NW AT 1:38 A.M.*
ASOS……………………18 NW AT 1:28 A.M.
DAVIS…………………..17 NW AT 1:38 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY……………….. 14 NW AT 1:14 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………14 NW AT 1:28 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..13 WNW AT 12:10 A.M.
AVERAGE WIND SPEED AND DIRECTION……………7.6 SSW
ASOS……………………8.0
DAVIS…………………..6.8 WNW [290 DEG]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.00 DEPARTURE…..-0.14
ASOS……………0.00
TOTAL PRECIPITATION FOR THE MONTH………..1.35 DEPARTURE…..-0.67
ASOS……………1.33
TOTAL PRECIPITATION FOR THE YEAR………..31.60 DEPARTURE…..-5.43
ASOS…………….N/A ***
*** ASOS annual total not available due to erroneous readings
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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 72/58/65/0/0.00/297/38 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/…./000/00 29 NE RMY N/A
9/11 70/59/65/0/…./084/11 33 NE RMY N/A
9/12 75/58/67/2/…./…/.. 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/…/.. 33 W RMY 35
9/15 82/56/69/+5/0.00/…/.. 23 W RMY N/A
9/16 84/62/73/+10/0.00/…/.. 17 NW RMY N/A
9/17 low since midnight is 64F; normal low is now 54F
DAILY RECORDS FOR SEPTEMBER 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**
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR SEPTEMBER 17
HIGH 86F IN 1915,1941,1991
LOW 38F IN 1959
PRECIP 2.73 INCHES IN 1933
PEAK GUST 60 MPH WNW IN 1999
RECORDS FOR SEPTEMBER 18
HIGH 88F IN 1906
LOW 36F IN 1919
PRECIP 4.25 INCHES IN 1996
PEAK GUST 77e MPH WNW IN 1948
TODAY’S REPORT PREPARED BY: Brian Fitzgerald
