BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA FRIDAY, JULY 24, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME THINNING OVERCAST WITH DECREASING DEW POINTS ATOP GREAT BLUE HILL... A line of early evening thunderstorms rolled through yesterday bringing with it frequent lightning, thunder and tropical downpours. 0.48 inches of rain was measured at the 7AM observation. This was another dose of beneficial rainfall to chip away at this month's (and year's) deficits. It was an overcast morning with dew point temperatures in the upper-60s. As the morning progressed, dew points slipped from the upper-60s to the low/mid-60s by 1 PM. This is a very welcomed reprieve from the muggy and stuffy conditions that dominated this week. Clouds have had a firm grip on the region, but a very gradual thinning pattern has been noted. Splashes of sun have poked through breaks in overcast with the sun becoming more dimly visible by the early afternoon. Winds have remained light out of the northeast for the duration of today achieving a max gust of only 18 MPH. The high so far today is 80 degrees. This is 1 degree below the daily normal high of 81F. The low since midnight is 68F, which is 5 degrees above the daily normal low of 63F Today's Observations: 7 A.M. Weather: Overcast Altostratus/Altocumulus (breaks in overcast overhead) Temperature: 70F; Dew Point: 67F; Relative Humidity: 90% Wind: North at 5 kts (winds light) Sea-level pressure: 30.08 ins. Hg: rising, then more slowly Visibility: 25 miles, thin fog 6-hr Max temp: 72F 6-hr Min temp: 68F 24-hr Precip: 0.48 ins. BHO SA 1155 E120 OVC 25 187/70/67/3505/008/ BINOVC OVHD THN F ALQDS WND LGT/ 8/05/ 51016 70048 10072 20068 10 A.M. Weather: Scattered Altocumulus, (thin) Broken Cirrus, (few cumulus south to north) Temperature: 77F; Dew Point: 63F; Relative Humidity: 63% Wind: ENE at 6 kts (wind light) Sea-level pressure: 30.03 ins. Hg: rising then more rapidly Visibility: 35 miles (hazy) 3-hr Precip: 0.00 ins. BHO SA 1455 120 SCT E230 –BKN 35 171/77/63/0706/003/ FEW CU S-N HAZY WND LGT/ 8/132 53016 1 P.M. Weather: Scattered Cumulus, (thin) Overcast Cirrostratus (breaks in overcast northeast to southeast, sun dimly visible) Temperature: 79F; Dew Point: 64F; Relative Humidity: 61% Wind: NE at 6 kts (wind light) Sea-level pressure: 30.03 ins. Hg: falling, then more rapidly Visibility: 45 miles (hazy) 6-hr Max temp: 80F 6-hr Min temp: 70F 6-hr Precip: 0.00 ins. BHO SA 1755 35 SCT E250 –OVC 45 168/79/64/0506/003/ BINOVC NE-SE SUN DMLY VSBL HAZY WND LGT/ 8/207 58003 10080 20070 SUMMARY FOR THURSDAY, JULY 23, 2020 TEMPERATURE (DEGREES F) MAX.....88   NORMAL.....81 MIN.....68   NORMAL.....63 MEAN....78   NORMAL.....72 DEPARTURE FROM 30-YEAR NORMAL.................. +6 TOTAL DEPARTURE FOR THE MONTH................. +43 [+1.7 DEGREES/DAY] COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY...............13  DEPARTURE....... +5 TOTAL COOLING UNITS FOR THE MONTH..............186  DEPARTURE.......+25 TOTAL COOLING UNITS FOR THE SEASON.............370  DEPARTURE.......+80 TOTAL COOLING UNITS LAST SEASON TO DATE........326  DEPARTURE.......+44 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................31 N   AT 4:04 P.M.                      AERO.........................32 N   AT 3:57 P.M.                    ASOS.........................30 N   AT 4:00 P.M.                    DAVIS........................30 N   AT 3:59 P.M                    RMY 21 MERLIN 31 FASTEST MILE FOR YESTERDAY......................22 NNW AT 4:00 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................21 NNW AT 4:04 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................21 NNW AT 3:59 P.M. AVERAGE WIND SPEED AND DIRECTION...............8.6 SW                               ASOS........................8.8                    DAVIS.......................8.5 SW [223 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M......0.48  DEPARTURE......+0.35                          ASOS................0.49 TOTAL PRECIPITATION FOR THE MONTH............1.71  DEPARTURE......-1.15                          ASOS................1.79 TOTAL PRECIPITATION FOR THE YEAR............29.06  DEPARTURE......-0.77                          ASOS...............29.80 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 07/01  76/63/70/0/0.00/228/25              16 E    AERO 14 E    RMY 14  TSTM 07/02  86/61/74/4/0.00/803/88              30 WSW  AERO 25 WSW  RMY 33 07/03  73/60/67/-4/0.00/091/10             30 NE   AERO 28 NE   RMY 30 07/04  79/60/70/-1/0.00/565/62             16 S    AERO 16 S    RMY 16 07/05  83/63/73/+2/0.54/373/41             24 NW   AERO 30 NW   RMY 26  TSTM 07/06  73/60/67/-4/0.00/.../..             20 ENE  AERO 16 NNE  RMY 18 07/07  78/60/69/-2/0.00/.../..             25 S    AERO 25 S    RMY 26 07/08  83/64/74/+2/0.00/.../..             32 SSW  AERO 32 SSW  RMY 32 07/09  89/70/80/+8/0.00/.../.              24 S    AERO 23 S    RMY 22 07/10  83/70/77/+5/0.05/.../..             30 SSE  AERO 32 SSE  RMY N/A 07/11  85/70/78/+6/0.00/.../..             39 S    AERO 39 S    RMY 38 07/12  86/70/78/+6/0.00/.../..             28 WSW  AERO 28 WSW  RMY 29 07/13  82/69/76/+4/0.23/.../..             30 SSE  AERO 31 SSE  RMY 30  TSTM 07/14  78/63/71/-1/0.00/.../..             26 ENE  AERO 25 ENE  RMY 26   07/15  72/59/66/-6/0.00/.../..             21 NE   AERO 21 NE   RMY N/A 07/16  73/57/65/-7/0.00/.../..             21 E    AERO 21 E    RMY 19 07/17  71/57/64/-8/0.19/.../..             24 SSW  AERO 24 SSW  RMY 25 07/18  89/66/78/+6/0.00/.../..             18 W    AERO 17 W    RMY 19 07/19  92/69/81/+9/0.00/.../..             28 S    AERO 28 S    RMY 26 07/20  91/72/82/+10/T/.../..               25 SSW  AERO 25 SSW  RMY N/A 07/21  88/68/78/+6/0.00/.../..             25 W    AERO 25 W    RMY 24 07/22  80/67/74/+2/.../.../..              16 ENE  AERO M  M    RMY 16 07/23  88/68/78/+6/0.48/.../..             31 N    AERO 32 N    RMY 31 TSTM 07/24 The low since midnight is 68F, the daily normal low is 63F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):   RECORDS FOR JULY 24 HIGH 96F IN 1987 LOW 49F IN 1893,1912 PRECIP 2.27 INS IN 2008 PEAK GUST 46 MPH NE IN 2009 RECORDS FOR JULY 25 HIGH 96F IN 2016 LOW 51F IN 1901,1953 PRECIP 2.25 INS IN 1990 PEAK GUST 88 MPH NW IN 1972 TODAY'S REPORT PREPARED BY: Andrew Swanson