BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SUNDAY, OCTOBER 11, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME COOLER, BUT PLEASANT DAY WITH INCREASING CLOUDINESS... Plenty of sunshine greeted us through the first half of the day, however this afternoon an increasing amount of high clouds has filtered the sun from time to time. The air has really dried out with the dew point falling to the upper 30s and low 40s. This has afforded excellent visibility for the day of 70-80 miles. A cold front moved through early this morning bringing with it some breezy conditions for a couple of hours in the cold air advection. Gusts of 25-30 mph were common, however winds have diminished and turned east- northeasterly, helping to hold temperatures in the upper 50s to low 60s. The high temperature for the day occurred way back at midnight before the front came through. The high so far today is 64, 12 degrees above the daily normal of 62F. The low since midnight is 53F, which is 8 degrees above the normal low of 45F. PRELIMINARY STATS FOR SEPTEMBER 2020 TEMPERATURE, Deg. F Avg. Max. 73.2 [+1.6] Avg. Min. 54.9 [+0.3] Mean 64.1 [+1.0] 24-hour corrected mean: 63.6 Max. for month: 82F on the 8th Min. for month: 39F on the 22nd HEATING DEGREE DAYS Total heating units: 95 [-22] Total for the season: 98 [-44] Total for last season: 93 COOLING DEGREE DAYS Total cooling units: 73 [+13] Total for the season: 830 [+233] Total for last season: 680 PRECIPITATION, Inches Total: 1.61 [-2.45] Greatest in 24 hrs: 1.02 ins. on 29th-30th WIND, mph Avg. uncorrected wind speed: 10.6 mph Avg. corrected wind speed: 11.1 mph Prevailing wind direction: S [20%] Peak gust and direction: 71 S on the 30th SUNSHINE: Campbell-Stokes card minutes: 12150 minutes of a possible 21582 or 56% Astronomical total minutes: 12593 minutes of a possible 22403 or 56% Today's Observations: 7 A.M. Weather: Thin scattered cirrus, few stratocumulus distant ENE-ESE and distant WSW-NW, few altocumulus/castellanus distant E-SSE Temperature: 53F; Dew Point: 39F; Relative Humidity: 58% Wind: NNW at 15G25 kts, peak wind NNW 28kts at 6:09 A.M. Sea-level pressure: 30.08 ins. Hg: rising, then more rapidly Visibility: 70 miles 6-hr Max temp: 64F 6-hr Min temp: 53F 24-hr Precip: 0.00 ins. BHO SA 1155 250 -SCT 70 187/53/39/3415G25/008/ FEW SC DSNT ENE-ESE AND DSNT WSW-NW FEW AC/ACC DSNT E-SSE PK WND 3428/09/ 8/581 53039 10064 20053 10 A.M. Weather: Thin scattered cirrus, few stratocumulus distant all quadrants Temperature: 60F; Dew Point: 40F; Relative Humidity: 47% Wind: N at 5 kts, wind light and variable Sea-level pressure: 30.17 ins. Hg: rising, then more slowly Visibility: 80 miles 3-hr Precip: 0.00 ins. BHO SA 1455 250 -SCT 80 216/60/40/0105/017/ FEW SC DSNT ALQDS WND L/V/ 8/501 51029 1 P.M. Weather: Broken cirrus, few stratocumulus distant all quadrants Temperature: 58F; Dew Point: 39F; Relative Humidity: 49% Wind: ENE at 8 kts Sea-level pressure: 30.18 ins. Hg: rising, then falling Visibility: 80 miles 6-hr Max temp: 61F 6-hr Min temp: 53F 6-hr Precip: 0.00 ins. BHO SA 1755 E250 BKN 80 221/58/39/0608/018/ FEW SC DSNT ALQDS/ 8/502 50005 10061 20053 SUMMARY FOR SATURDAY, OCTOBER 10, 2020 TEMPERATURE (DEGREES F) MAX.....75 NORMAL.....62 MIN.....52 NORMAL.....45 MEAN....64 NORMAL.....54 DEPARTURE FROM 30-YEAR NORMAL................+10 TOTAL DEPARTURE FOR THE MONTH................+22 [+2.0 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY............. 1 DEPARTURE.....-11 TOTAL HEATING UNITS FOR THE MONTH.............75 DEPARTURE.....-25 TOTAL HEATING UNITS FOR THE SEASON...........173 DEPARTURE.....-70 TOTAL HEATING UNITS LAST SEASON TO DATE......196 DEPARTURE.....-23 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY............. 0 DEPARTURE...... 0 TOTAL COOLING UNITS FOR THE MONTH............. 1 DEPARTURE..... -3 TOTAL COOLING UNITS FOR THE SEASON...........831 DEPARTURE....+230 TOTAL COOLING UNITS LAST SEASON TO DATE......682 DEPARTURE....+149 PEAK WIND GUST FOR YESTERDAY (MPH) 420C/Official...............40 SSW AT 1:11 P.M. AEROVANE....................40 SSW AT 3:26 P.M. ASOS........................38 SSW AT 1:51 P.M. DAVIS #1....................42 SSW AT 1:11 P.M. DAVIS #2....................39 SSW AT 11:49 A.M. RMY 38 MERLIN 39 FASTEST MILE FOR YESTERDAY.....................30 SSW AT 12:22 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE..................29 SSW AT 11:50 A.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE..............29 SSW AT 11:50 A.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE..............30 SSW AT 11:50 A.M. AVERAGE WIND SPEED AND DIRECTION.............20.3 SSW (488 total miles) ASOS......................19.7 DAVIS.....................19.4 SW [226 deg.] 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..........0.16 DEPARTURE....-1.33 ASOS..............0.12 TOTAL PRECIPITATION FOR THE YEAR..........34.58 DEPARTURE....-5.99 ASOS.............35.33 PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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 09/01 76/59/68/0/0.00/698/88 22 SSE AERO 21 SE RMY 20 09/02 69/59/64/-4/0.18/102/13 23 SSE AERO 23 SSE RMY 24 09/03 75/66/71/+4/0.04/000/00 22 SSW AERO 21 SSW RMY N/A 09/04 82/62/72/+5/0.00/763/98 26 WNW AERO 26 WNW RMY 25 09/05 76/55/66/-1/0.00/760/98 25 W AERO 25 W RMY 24 09/06 78/58/68/+1/0.00/356/46 24 W AERO 24 W RMY N/A 09/07 79/61/70/+4/0.00/632/82 27 SSE AERO 30 SSE RMY 28 09/08 82/61/72/+6/0.00/545/71 17 S AERO 16 S RMY 17 09/09 80/62/71/+5/0.00/214/28 16 S AERO 15 S RMY 16 09/10 81/69/75/+10/0.28/015/02 21 SSW AERO 21 SSW RMY N/A 09/11 72/55/64/-1/0.01/152/20 25 N AERO 25 N RMY N/A 09/12 68/51/60/-5/0.00/666/88 21 ENE AERO 21 ENE RMY 21 09/13 74/53/64/0/0.00/611/81 26 SSW AERO 26 SSW RMY 26 09/14 74/50/62/-2/0.00/511/68 29 NNW AERO 33 NNW RMY 30 09/15 64/44/54/-10/0.00/583/78 18 S AERO 18 S RMY N/A 09/16 72/49/61/-2/0.00/603/81 31 SSW AERO 31 SSW RMY 31 09/17 76/57/67/+4/0.00/453/61 26 WSW AERO 28 W RMY N/A 09/18 64/48/56/-6/0.00/163/22 28 NE AERO 30 NNW RMY N/A 09/19 59/42/51/-11/0.00/722/98 23 N AERO 23 N RMY N/A 09/20 58/40/49/-13/0.00/602/82 25 NE AERO 25 NE RMY 27 09/21 61/41/51/-10/0.00/694/95 29 NE AERO 27 NE RMY 29 09/22 63/39/51/-10/0.00/022/03 28 NNW AERO 30 NNW RMY 29 09/23 78/50/64/+4/0.00/617/85 31 NW AERO 32 WNW RMY 32 09/24 76/57/67/+7/0.00/347/48 20 SW AERO 18 WSW RMY 19 09/25 77/57/67/+7/0.00/655/91 18 ENE AERO 18 WSW RMY N/A 09/26 77/57/67/+8/0.00/516/72 21 S AERO 21 S RMY 21 09/27 79/64/72/+13/0.01/121/17 24 S AERO 25 S RMY 24 09/28 78/64/71/+13/0.07/199/28 24 SSE AERO 24 S RMY 25 09/29 76/62/69/+11/0.01/234/33 30 S AERO 30 S RMY N/A 09/30 72/56/64/+6/1.01/395/56 71 S AERO 88 S RMY N/A PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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 10/01 75/56/66/+9/0.00/.../.. 28 SW AERO 28 SW RMY N/A 10/02 63/49/56/-1/0.02/.../.. 20 NW AERO 21 NW RMY 20 10/03 65/45/55/-1/0.00/.../.. 19 WNW AERO 19 WNW RMY 19 10/04 65/45/55/-1/0.00/.../.. 17 ESE AERO 18 ESE RMY 18 10/05 62/52/57/+1/0.00/.../.. 17 ENE AERO 17 ENE RMY N/A 10/06 69/51/60/+5/0.00/.../.. 28 S AERO 28 S RMY 29 10/07 73/50/62/+7/0.14/.../.. 76 W AERO 74 W RMY 70 TSTM 10/08 61/42/52/-2/0.00/.../.. 41 W AERO 41 W RMY N/A 10/09 60/37/49/-5/0.00/.../.. 25 SSW AERO 28 SSW RMY N/A 10/10 75/52/64/+10/0.00/.../.. 40 SSW AERO 40 SSW RMY 38 10/11 The low since midnight is 53F, the daily normal low is 45F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR OCTOBER 11 HIGH 80F IN 1919,1949 LOW 28F IN 1993 PRECIP 0.96 INCHES IN 1903 SNOWFALL (NONE) PEAK GUST 66e MPH WNW IN 1941 RECORDS FOR OCTOBER 12 HIGH 87F IN 1954 LOW 31F IN 1906 PRECIP 1.53 INCHES IN 1948 SNOWFALL TRACE IN 1941 PEAK GUST 55 MPH NW IN 1963 TODAY'S REPORT PREPARED BY: Matt Douglas