BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA TUESDAY, OCTOBER 12, 2021 ALL TIMES ARE IN EASTERN STANDARD TIME SUNRISE: 0554E SUNSET: 1707E A MIX OF SUN AND CLOUDS WITH WARM AIR AND LIGHT WIND.... We were treated to a not too common complete undercast this morning as dense fog was trapped under an inversion. Blue Hill was high enough to be above this inversion. So while many were waking up to fog, we were experiencing a nice early morning with sunshine here on the summit. We could see only the tops of about 5 skyscrapers in Boston as we looked north, with other hill tops around the region looking like islands among a sea of clouds! It was a really surreal sight! The fog burned off by late morning and then everyone has been able to share in the splendor of the day. Only some high thin cirrus clouds are decorating the sky, thus allowing for abundant sunshine. Temperatures have likewise responded with readings getting to the low-mid 70s for many. With a dew point hovering in the upper 50s to around 60, it does feel a tad sticky, but compared to all the humidity this summer, it's really not bad at all. The wind has been very light today, only averaging around 4mph for the day. The peak gust so far has only been 12 mph! As high pressure slips off the Mid Atlantic coast, the wind has backed from north this morning to south this afternoon. I suspect speeds may pick up a bit for a time this evening. Visibility has been limited today, this morning due to fog, and this afternoon due to haziness. We were able to see 20 miles this morning above the inversion, but has improved to only around 40 miles this afternoon. The high so far today is 73F, 11 degrees above the normal max of 62F. The low since midnight is 54F, 9 degrees above the normal low of 45F. -------------------------------------------------------------- PRELIMINARY STATS FOR SEPTEMBER 2021 TEMPERATURE, Deg. F Avg. Max. 73.2 [+0.5] Avg. Min. 57.4 [+1.8] Mean 65.3 [+1.1] 24-hour corrected mean: 64.8 Max. for month: 82F on the 15th Min. for month: 45F on the 29th HEATING DEGREE DAYS Total heating units: 46 [-54] Total for the season: 74 [-44] Total for last season: 98 COOLING DEGREE DAYS Total cooling units: 62 [-12] Total for the season: 714 [+44] Total for last season: 830 PRECIPITATION, Inches Total: 6.64 [+2.58] Greatest in 24 hrs: 4.00 inches on the 1st/2nd WIND, mph Avg. uncorrected wind speed: 10.5 mph Avg. corrected wind speed: 11.0 mph Prevailing wind direction: NW [11%] Peak gust and direction: 49 ENE on the 2nd SUNSHINE: Campbell-Stokes card minutes: 11490 of a possible 21582, or 53% Astronomical total minutes: 11965 of a possible 22423, or 53% -------------------------------------------------------------- Today's Observations: 7 A.M. Weather: Broken undercast stratus, thin broken cirrus Temperature: 57F; Dew Point: 57F; Relative Humidity: 100% Wind: NNW @ 3 kts, wind light Sea-level pressure: 1021.6 mb; 30.17 in. Hg: rising, then more rapidly Visibility: 20 miles 6-hr Max temp: 57F 6-hr Min temp: 54F 24-hr Precip: 0.00 ins. BHO SA 1155 /// BKN E250 -BKN 20 216/57/57/3303/017/ BRKS IN UNDERCAST E-ESE VSBY 20 ABV INVRSN WND LGT/ 8/601 53009 10057 20054 10 A.M. Weather: Thin broken cirrus, few stratocumulus distant SW-W and distant E-SE Temperature: 62F; Dew Point: 59F; Relative Humidity: 90% Wind: Estimated SW @ 2 kts, wind light and variable Sea-level pressure: 1021.4 mb; 30.16 in Hg; rising then falling Visibility: 40 miles 3-hr Precip: 0.00 ins. BHO SA 1455 E250 -BKN 40 214/62/59/E2302/016/ FEW SC DSNT SW-W AND DSNT E-SE WND L/V/ 8/501 58002 1 P.M. Weather: Thin broken cirrus Temperature: 72F, Dew point: 58F; Relative Humidity: 61% Wind: S @ 4 kts, wind light Sea-level pressure: 1019.7 mb; 30.11 in Hg; falling, then more rapidly Visibility: 40 miles 6-hr Max temp: 73F 6-hr Min temp: 57F 6-hr Precip: 0.00 ins. BHO SA 1755 E250 -BKN 40 197/72/58/1904/011/ WND LGT/ 8/001 58017 10073 20057 SUMMARY FOR MONDAY, OCTOBER 11, 2021 TEMPERATURE (DEGREES F) MAX.......67 NORMAL.....63 MIN.......56 NORMAL.....46 MEAN......62 NORMAL.....54 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL.............. +8 TOTAL DEPARTURE FOR THE MONTH..........................+29 [+2.4 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022) TOTAL HEATING UNITS FOR YESTERDAY................3 DEPARTURE........-8 TOTAL HEATING UNITS FOR THE MONTH...............68 DEPARTURE.......-34 TOTAL HEATING UNITS FOR THE SEASON.............142 DEPARTURE.......-77 TOTAL HEATING UNITS LAST SEASON TO DATE........182 DEPARTURE.......-40 COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021) TOTAL COOLING UNITS FOR YESTERDAY................0 DEPARTURE.........0 TOTAL COOLING UNITS FOR THE MONTH................0 DEPARTURE........-5 TOTAL COOLING UNITS FOR THE SEASON.............714 DEPARTURE.......+39 TOTAL COOLING UNITS LAST SEASON TO DATE........831 DEPARTURE......-117 PEAK WIND GUST (MPH): Official...................20 NE @ 3:31 A.M. AEROVANE (south tower).....21 NE @ 3:23 A.M. VECTOR #2 (south tower)....23 @ 3:31 A.M. DAVIS #2 (south tower).....20 ENE @ 2:56 A.M. ASOS...........OUT OF SERVICE D/T RENOVATIONS VECTOR #1......OUT OF SERVICE D/T RENOVATIONS DAVIS #1.......OUT OF SERVICE D/T RENOVATIONS RMY............OUT OF SERVICE D/T RENOVATIONS MERLIN.........OUT OF SERVICE D/T RENOVATIONS FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL..................14 NE @ 3:24 A.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE..............15 @ 2:56 A.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............15 E @ 2:57 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE.......OUT OF SERVICE D/T RENOVATIONS MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...OUT OF SERVICE D/T RENOVATIONS MAXIMUM 2-MINUTE VECTOR #1 AVERAGE..OUT OF SERVICE D/T RENOVATIONS MAXIMUM 2-MINUTE RMY AVERAGE........OUT OF SERVICE D/T RENOVATIONS AVERAGE WIND SPEED AND DIRECTION: CONTACTING/OFFICIAL........ 8.0 NE [192 total miles] VECTOR #2.................. 8.7 DAVIS #2................... 8.6 ENE RMY.................OUT OF SERVICE D/T RENOVATIONS ASOS................OUT OF SERVICE D/T RENOVATIONS VECTOR #1...........OUT OF SERVICE D/T RENOVATIONS DAVIS #1............OUT OF SERVICE D/T RENOVATIONS PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.......0.00 DEPARTURE....-0.18 TOTAL PRECIPITATION FOR THE MONTH.............2.10 DEPARTURE....+0.24 TOTAL PRECIPITATION FOR THE YEAR.............49.08 DEPARTURE....+8.81 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 68/56/62/-7/1.47/000/00 34 NNE AERO 37 NNE RMY N/A 09/02 71/55/63/-6/2.53/322/41 49 ENE AERO 52 ENE RMY N/A 09/03 72/52/62/-6/0.00/735/94 23 NW AERO 23 NW RMY N/A 09/04 76/55/66/-2/0.00/757/97 22 WNW AERO 21 WNW RMY N/A 09/05 72/60/66/-2/0.04/008/01 27 S AERO 29 S RMY N/A 09/06 80/61/71/+3/0.00/557/72 24 WNW AERO 25 WNW RMY N/A 09/07 78/57/68/+1/0.00/732/95 23 WSW AERO 22 WSW RMY N/A 09/08 81/61/71/+4/0.00/646/84 43 S AERO 45 S RMY N/A 09/09 71/64/68/+1/0.90/000/00 33 S AERO 36 S RMY N/A 09/10 74/55/65/-1/0.04/595/78 31 NW AERO 32 WNW RMY N/A 09/11 75/51/63/-3/0.00/730/96 24 SW AERO 24 SW RMY N/A 09/12 79/60/70/+4/0.00/591/78 33 SW AERO 32 SW RMY N/A 09/13 77/62/70/+5/0.06/559/74 22 NW AERO 23 NW RMY N/A 09/14 75/59/67/+2/0.00/444/59 23 S AERO 25 S RMY N/A 09/15 82/65/74/+9/T/539/72 32 SSW AERO 35 SSW RMY N/A 09/16 69/61/65/+1/0.27/037/05 24 ENE AERO 24 ENE RMY N/A TSTM 09/17 66/60/63/-1/0.02/000/00 22 NE AERO 23 NE RMY N/A 09/18 74/62/68/+5/0.04/207/28 17 WNW AERO 18 WNW RMY N/A TSTM 09/19 71/57/64/+1/0.15/619/84 23 NNE AERO 24 NNE RMY N/A 09/20 71/55/63/0/0.00/647/88 20 SE AERO 20 SE RMY N/A 09/21 75/55/65/+3/0.00/490/67 19 SSE AERO 20 SSE RMY N/A 09/22 75/65/70/+8/0.02/153/21 30 S AERO 30 S RMY N/A 09/23 78/65/72/+10/0.08/298/41 36 SSE AERO 37 SSE RMY N/A 09/24 75/62/69/+8/0.02/007/01 43 SSE AERO 45 SSE RMY N/A 09/25 74/59/67/+6/0.02/303/42 14 N AERO 14 NNW RMY N/A 09/26 73/54/64/+4/0.57/510/71 33 WNW AERO 32 WNW RMY N/A 09/27 73/52/63/+3/T/529/74 30 SW AERO 30 SW RMY N/A 09/28 67/52/60/+1/0.40/028/04 27 SSW AERO 25 SSW RMY N/A TSTM 09/29 63/45/54/-5/0.00/568/80 25 NNW AERO 25 NNW RMY N/A 09/30 60/46/53/-6/0.01/354/50 22 NNW AERO 21 NNW 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 64/44/54/-4/0.00/.../.. 20 WNW AERO 20 WNW RMY N/A 10/02 73/47/60/+2/0.00/.../.. 24 WSW AERO 23 WSW RMY N/A 10/03 65/55/60/+3/0.09/.../.. 19 E AERO 19 E RMY N/A 10/04 59/51/55/-2/1.69/.../.. 30 E AERO 30 E RMY N/A 10/05 58/50/54/-3/0.30/.../.. 22 NNE AERO 23 NE RMY N/A 10/06 69/50/60/+4/0.00/.../.. 15 N AERO 16 N RMY N/A 10/07 73/55/64/+8/0.00/.../.. 15 WSW AERO 15 W RMY N/A 10/08 69/55/62/+7/T/.../.. 24 ENE AERO 23 ENE RMY N/A 10/09 62/54/58/+3/0.01/.../.. 23 E AERO 23 E RMY N/A 10/10 62/54/58/+3/T/.../.. 22 E AERO 21 E RMY N/A 10/11 67/56/62/+8/0.01/.../.. 20 NE AERO 21 NE RMY N/A 10/12 The low since midnight is 54F, 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 12 HIGH 87F IN 1954 LOW 31F IN 1906 PRECIP 1.70 INCHES IN 1948 SNOWFALL TRACE IN 1904, 1941 PEAK GUST 55 MPH NW IN 1963 RECORDS FOR OCTOBER 13 HIGH 84F IN 1930,1954 LOW 29F IN 2012 PRECIP 5.87 INCHES IN 1895 SNOWFALL 4.2 INCHES IN 1934 PEAK GUST 46e MPH W IN 1950 TODAY'S REPORT PREPARED BY: Matt Douglas