Saturday, July 28, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JULY 28, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

WARM TEMPERATURES AND HIGH DEW POINTS

Yesterday’s average temperature was 7F above normal for this
time of year, and so far, today’s temperatures have also been
higher than normal. Yesterday’s maximum temperature was 88F.
The temperature dropped down to only 71F overnight, and it has
risen to a maximum of 86F by the 1:00 P.M. EST observation today.
Dew points are continuing to be high in the upper 60s to lower
70s. Visibility has been poor for most of the day due to the
humidity. This morning, thin fog reduced visibility to just 15
miles, but it cleared to 40 miles by the afternoon. Winds have
been lower today out of south and southwest. Yesterday’s peak
gust was 26 MPH out of the south at 1:51 P.M., and so far today
the peak has been 16 MPH out of the southwest at 12:58 P.M.

Today’s Observations:

7 A.M.
Weather: Broken stratocumulus
Temperature: 74F; Dew Point: 71F; Wind: SSW at 4 kts,
Wind speed: Light
Sea-level pressure: 30.03 ins. Hg, rising steadily
Visibility: 15 miles, thin fog
6-hr Max temp: 74F
6-hr Min temp: 72F
24-hr Precip: 0.01 ins.
BHO SA 1155 E005 BKN 15 169/74/71/2004/003/ THN FG
WND LGT/ 8/4// 52012 MANUAL 70001 10074 20072

10 A.M.
Weather: Scattered cumulus, broken cirrus
Temperature: 81F; Dew Point: 68F; Wind: SW at 5 kts,
Wind speed: Light
Sea-level pressure: 30.03 ins. Hg, steady, then rising
Visibility: 30 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 022 SCT E250 30 171/81/68/2205/003/ HAZY
WND LGT/ 8/101 53002

1 P.M.
Weather: Scattered cumulus, broken cirrus
Temperature: 85F; Dew Point: 68F; Wind: SSW at 6 kts,
Wind speed: Light
Sea-level pressure: 29.99 ins. Hg, falling, then more quickly
Visibility: 40 miles, distant haze in all directions
6-hr Max temp: 86F
6-hr Min temp: 74F
6-hr precip: 0.00 ins.
BHO SA 1755 040 SCT E250 40 155/85/68/2106/999/ DSNT HZ ALQDS
WND LGT/ 8/101 58016 10086 20074

SUMMARY FOR FRIDAY, JULY 27, 2018

TEMPERATURE (DEGREES F)
MAX…..88   NORMAL…..81
MIN…..69   NORMAL…..63
MEAN….79   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL…………………….+7
TOTAL DEPARTURE FOR THE MONTH……………………+74 [+2.5 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..14   DEPARTURE……….+8
TOTAL COOLING UNITS FOR THE MONTH………….254   DEPARTURE………+61
TOTAL COOLING UNITS FOR THE SEASON…………413   DEPARTURE………+91
TOTAL COOLING UNITS LAST SEASON TO DATE…….404   DEPARTURE……….+9

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..25 S   AT 1:51 P.M.
AERO…………………….23 SSW AT 2:46 P.M.
ASOS…………………….26 S   AT 2:58 P.M.
DAVIS……………………26 S   AT 2:59 P.M. RMY 26
FASTEST MILE FOR YESTERDAY………………….19 S   AT 4:31 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 S   AT 4:33 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………19 SSW AT 2:59 P.M.
AVERAGE WIND SPEED AND DIRECTION……………9.9 S
ASOS……………………9.8
DAVIS…………………..9.2 SSW [204 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.01  DEPARTURE……-0.13
ASOS…………..0.61
TOTAL PRECIPITATION FOR THE MONTH……….3.84  DEPARTURE……+0.42
ASOS…………..3.85
TOTAL PRECIPITATION FOR THE YEAR……….34.01  DEPARTURE……+3.80
ASOS………….35.58

PRELIMINARY CLIMATE SUMMARY FOR JULY 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

7/01 94/72/83/+13/0.00/667/73       21 ESE AERO 18 ESE RMY 19
7/02 90/68/79/+9/0.00/858/94        21 S   AERO 21 S   RMY 22
7/03 94/69/82/+11/0.00/657/72       20 SSW AERO 18 SW  RMY 19 TSTM
7/04 89/73/81/+10/0.00/884/97       17 NE  AERO 15 NE  RMY 16
7/05 91/73/82/+11/0.00/865/95       29 SSW AERO 28 SSW RMY N/A
7/06 80/59/70/-1/0.56/018/02        37 NNW AERO 38 SW  RMY 40 TSTM
7/07 78/54/66/-5/0.00/900/99        22 N   AERO 18 N   RMY N/A
7/08 83/57/70/-2/0.00/890/98        23 S   AERO 21 S   RMY 22
7/09 88/60/74/+2/0.00/852/94        23 SW  AERO 23 SW  RMY 24
7/10 91/63/77/+5/0.10/751/83        24 W   AERO 22 W   RMY N/A
7/11 73/62/68/-4/0.63/705/78        28 NE  AERO 25 NE  RMY 27 TSTM
7/12 77/56/67/-5/0.00/867/96        16 NW  AERO 15 NW  RMY N/A
7/13 84/61/73/+1/0.00/568/63        23 SSE AERO 23 SSE RMY 24
7/14 80/61/71/-1/0.00/540/60        18 S   AERO 16 S   RMY 19
7/15 84/65/75/+3/T/521/58           16 S   AERO 15 S   RMY 14
7/16 83/67/75/+3/0.00/682/76        23 S   AERO 23 S   RMY 23
7/17 88/67/78/+6/1.34/430/48        31 SW  AERO 30 SW  RMY 32 TSTM
7/18 81/63/72/0/0.02/769/86         21 NW  AERO 22 NW  RMY 23
7/19 80/56/68/-4/0.00/…/..        21 S   AERO 17 SSE RMY 19
7/20 83/62/73/1/0.00/…/..         21 SE  AERO 17 ESE RMY 19
7/21 76/59/68/-4/…./…/..        23 ENE AERO 20 ENE RMY N/A
7/22 76/63/69/-3/…./…/..        29 ESE AERO 28 ESE RMY N/A
7/23 82/71/77/+5/…./…/..        32 S   AERO 30 S   RMY 32
7/24 85/72/79/+7/T/…/..           31 S   AERO 29 S   RMY 29
7/25 82/71/77/+5/…./…/..        35 SSE AERO 32 SSE RMY N/A
7/26 83/69/76/+5/…./…/..        41 SSW AERO 39 SSW RMY N/A TSTM
7/27 88/69/79/+7/…./…/..        25 S   AERO 23 SSW RMY 26

7/28 Low temp since midnight is 72F; normal low is now 63F

DAILY RECORDS FOR JULY 2018

07/01/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 72F,
TIES PREVIOUS RECORD OF 72F SET IN 1968

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

RECORDS FOR JULY 28
HIGH 97F IN 1931
LOW 49F IN 1903
PRECIP 3.32 INS IN 1911
PEAK GUST 62 MPH SW IN 2006

RECORDS FOR JULY 29
HIGH 97F IN 1949
LOW 53F IN 1888,1914
PRECIP 1.53 INS IN 1901
PEAK GUST 40e MPH E IN 1941

TODAY’S REPORT PREPARED BY: Lizzy Suzedell