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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JULY 21, 2018 
ALL TIMES ARE IN EASTERN STANDARD TIME

COOLER TEMPERATURES AND RISING DEW POINTS

Today's temperatures have been cooler than yesterday's. The maximum 
temperature reached yesterday was 83F. It was seasonable, and the average 
temperature of 73F was just 1F above normal for this time of year. The 
minimum this morning was only 59F, which is 4F below normal, and the maximum 
so far was only 76F, which is 6F below the maximum temperature reached by 
this time yesterday. The dew point was very low this morning, as it was 
46F at 7:00 A.M. EST, but by 1:00 P.M., it had risen to 58F. Cumulus began to 
increase in the sky, and pressure was falling as the day went on. Rain is 
expected to arrive tomorrow.


Today's Observations:

7 A.M.
Weather: Thin smoke layer along horizon SW-NW, few distant cumulus NE-S, 
scattered cirrus
Temperature: 67F; Dew Point: 46F; Wind: estimated SE at 1 kt,
Wind speed: Light
Sea-level pressure: 30.018 ins. Hg, falling, then rising
Visibility: 70 miles 
6-hr Max temp: 67F
6-hr Min temp: 59F
24-hr Precip: 0.00 ins.
BHO SA 1155 250 SCT 70 220/67/46/E1301/018/ THN K LYR ALG HRZN SW-NW FEW CU 
DSNT NE-S AND WSW-NW WND LGT/ 8/101 53002 10067 20059

10 A.M.
Weather: Scattered cumulus, scattered cirrus
Temperature: 74F; Dew Point: 52F; Wind: E at 6 kts,
Wind speed: Light
Sea-level pressure: 30.19 ins. Hg, rising, then falling
Visibility: 70 miles
3-hr Precip: 0.00 ins. 
BHO SA 1455 029 SCT 250 SCT 70 222/74/55/0806/019/ WND LGT/ 8/101 50002

1 P.M.
Weather: Scattered cumulus, scattered cirrus
Temperature: 76F; Dew Point: 58F; Wind: E at 7 kts
Sea-level pressure: 30.16 ins. Hg, falling, then more quickly
Visibility: 70 miles
6-hr Max temp: 76F
6-hr Min temp: 67F
6-hr precip: 0.00 ins. 
BHO SA 1755 039 SCT 250 SCT 70 214/76/58/1007/016/ 8/101 58008 10076 20067


SUMMARY FOR FRIDAY, JULY 20, 2018 

TEMPERATURE (DEGREES F)
MAX.....83   NORMAL.....81
MIN.....62   NORMAL.....63
MEAN....73   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL.........................+1
TOTAL DEPARTURE FOR THE MONTH........................+53 [+2.5 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............8   DEPARTURE...........0
TOTAL COOLING UNITS FOR THE MONTH.............184   DEPARTURE.........+47
TOTAL COOLING UNITS FOR THE SEASON............343   DEPARTURE.........+77
TOTAL COOLING UNITS LAST SEASON TO DATE.......371   DEPARTURE.........-28

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................21 SE  AT 3:37 P.M.
                   AERO.........................17 ESE AT 3:42 P.M.
                   ASOS.........................29 ESE AT 2:02 P.M.
                   DAVIS........................19 E   AT 2:52 P.M. RMY 19
FASTEST MILE FOR YESTERDAY......................14 ESE AT 3:37 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................14 ESE AT 3:46 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................15 ESE AT 3:37 P.M. 
AVERAGE WIND SPEED AND DIRECTION...............8.3 S
                   ASOS........................9.1
                   DAVIS.......................8.6 S [184 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.13
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........2.65  DEPARTURE......+0.19
                         ASOS..............2.69 
TOTAL PRECIPITATION FOR THE YEAR..........32.82  DEPARTURE......+3.57
                         ASOS.............34.42


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/.../..        16 NW  AERO 15 NW  RMY N/A 
7/13 84/61/73/+1/0.00/.../..        23 SSE AERO 23 SSE RMY 24
7/14 80/61/71/-1/0.00/.../..        18 S   AERO 16 S   RMY 19
7/15 84/65/75/+3/T/.../..           16 S   AERO 15 S   RMY 14 
7/16 83/67/75/+3/0.00/.../..        23 S   AERO 23 S   RMY 23 
7/17 88/67/78/+6/1.34/.../..        31 SW  AERO 30 SW  RMY 32 TSTM 
7/18 81/63/72/0/0.02/.../..         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 Low temp since midnight is 59F; 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 21
HIGH 100F IN 1977 [RECORD FOR MONTH]
LOW 48F IN 1890
PRECIP 2.09 INS IN 1938
PEAK GUST 60e MPH WNW IN 1977

RECORDS FOR JULY 22
HIGH 99F IN 1926, 2011
LOW 52F IN 1890
PRECIP 1.73 INCHES IN 1900 
PEAK GUST 55 MPH IN 1983

TODAY'S REPORT PREPARED BY: Lizzy Suzedell