BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, AUGUST 1, 2011 ALL TIMES ARE IN EASTERN STANDARD TIME JULY 2011 FINISHES 4TH WARMEST ON RECORD JULY MINIMUM TEMP. OF 58F TIES WITH 2006 FOR SECOND WARMEST July 2011 finished 4th warmest on record for not only this month but for any month on record at Blue Hill. As a result four out of the top five warmest months on record at Blue Hill have occurred in the past 17 years. In addition, the minimum temperature for July of 58F ties with 2006 for 2nd warmest on record. Below is the listing of our warmest Julys: Warmest July Corrected Mean Temperature (deg F) (also warmest for all months of the year) 1) 75.1 in 2010 2) 74.9 in 1952 3) 74.1 in 1994 4) 74.0 in 2011 5) 73.8 in 1999 6) 73.5 in 1949 JULY 2011 STATS Temp: Deg. F Av. Max. 83.7 Av. Min. 64.6 Mean 74.2 [+2.6] 24-hour corr. mean = 74.0 Highest 99 on 22nd Lowest 58 on 14th Total heating units: 1 [-8] Total cooling units: 292 [+77} Total cooling for season: 443 [+110] Total precip: 2.38 [-1.36] Av. wind speed: 10.0 MPH Prevailing wind direction: SSW 13% Av. wind speed (corr) 10.5 MPH SSW Peak wind gust: 38 MPH WSW on 18th Fastest mile: 29 MPH SSW on 21st Sunshine: N/A More info later this week... Today's observations: 7 A.M. Weather: Scattered altocumulus castellanus and floccus Temperature: 73F, Dew point: 64F; Wind: W at 8 kts Sea-level pressure: 29.91 inches Hg, steady Visibility: 25 miles, hazy 6-hour min. temp: 69F BHO SA 1155 95 SCT 25 127/73/64/2708/991/ ACC/AC FLOCCUS ALQDS HAZY WND GRDLY VEERING/ 8/080 56003 10073 20069 10 A.M. Weather: Clear, small cumulus forming SW-N, few moderate cumulus forming distant WNW, lone altocumulus lenticularis W, few cirrus SW-WNW Temperature: 85F, Dew Point: 65F; Wind: SSW at 5 kts Wind: Light Sea-level pressure: 29.89 inches Hg, falling Visibility: 35 miles, 45 miles WNW, 25 miles NE-SE BHO SA 1455 CLR 35 123/85/65/2105/989/ FEW SML CU FRMG SW-N FEW MDT CU FRMG DSNT WNW LONE ACSL W FEW CI SW-WNW VSBY WNW 45 NE-SE 25 LGT DSNT HZ WND LGT/ 8/241 58004 1 P.M. Weather: Scattered moderate cumulus, scattered dense cirrus, upper parts of cumulonimbi to W and NW, thin broken cirrus Temperature: 90F, Dew Point: 63F; Wind: SSW at 11G18 kts Wind: Direction variable S-W Sea-level pressure: 29.82 inches Hg, falling Visibility: 20 miles, hazy 6-hour max. temp: 91F BHO SA 1755 55 SCT 200 SCT 250 –BKN 20 099/90/63/2111G18/982/ MDT CU ALQDS CBS DSNT W-NW CB TOPS DENSE CI W-NW MOVG E HAZY/ 8/203 58024 10091 20073 WEATHER SUMMARY FOR SUNDAY, JULY 31 TEMPERATURE (DEGREES F) MAX.....87 NORMAL.....81 MIN.....64 NORMAL.....63 MEAN....76 NORMAL.....72 DEPARTURE FROM 30-YEAR NORMAL....................+4 TOTAL DEPARTURE FOR THE MONTH...................+86 [+2.6 DEGREES/DAY] PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..............24 W AT 10:01 A.M. AEROVANE...............28 W AT 10:01 A.M. ASOS...................26 W AT 10:01 A.M. DAVIS..................23 W AT 10:01 A.M. THE FASTEST MILE FOR YESTERDAY............17 W AT 10:02 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE.............20 W AT 10:02 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE............17 WSW AT 10:02 A.M. AVERAGE WIND SPEED AND DIRECTION........10.0 WNW ASOS................. 8.9 DAVIS................ 9.0 W [270 deg] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE.........-0.12 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........2.38 DEPARTURE.........-1.36 ASOS..............2.32 TOTAL PRECIPITATION FOR THE YEAR..........29.69 DEPARTURE.........+0.28 ASOS..............30.18** **ASOS data is in error due to system failure on 1/12-13 PRELIMINARY CLIMATE SUMMARY FOR JULY 2011 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 7/1 78/59/69/-1/0.01/530/58 15 WNW 7/2 80/61/71/+1/0.00/603/66 17 SE 7/3 79/64/72/+2/0.02/018/02 22 S 7/4 86/68/76/+6/0.00/583/64 18 SW 7/5 89/66/78/+7/0.00/784/86 15 S 7/6 88/68/78/+7/T/792/87 30 WNW AERO 35 MPH TSTM 7/7 86/67/77/+6/0.00/481/53 17 WNW 7/8 74/65/70/-1/0.47/027/03 16 ESE TSTM 7/9 81/63/72/+1/0.11/698/77 29 WNW 7/10 83/59/71/0/0.00/860/95 21 SSW 7/11 89/65/77/+5/0.00/814/90 23 S 7/12 90/72/83/+9/0.00/777/86 25 W 7/13 85/61/73/+1/0.73/469/52 21 NE 7/14 70/58/64/-8/0.37/801/89 28 NNE TSTM 7/15 79/59/69/-3/0.00/692/77 17 SSW TSTM 7/16 85/61/73/+1/0.00/834/93 15 SW 7/17 88/67/78/+6/0.00/797/89 30 SSW 7/18 84/70/77/+5/0.02/188/21 38 WSW AERO 43 MPH 7/19 86/69/78/+6/0.00/777/87 18 WNW AERO 24 MPH 7/20 88/69/79/+7/0.00/766/86 29 SSW 7/21 93/68/81/+9/0.00/685/77 37 SSW AERO 43 MPH 7/22 99/76/88/+16/0.00/852/96 28 W AERO 36 MPH 7/23 90/68/79/+7/0.05/469/53 25 WNW TSTM 7/24 80/63/72/-1/0.03/274/31 20 NW AERO 27 MPH 7/25 74/59/67/-6/0.34/123/14 16 ESE 7/26 80/61/71/-1/0.09/237/27 33 S AERO 42 MPH 7/27 82/61/72/0/0.00/824/94 16 WSW 7/28 80/62/71/-1/0.00/.../.. 17 S 7/29 77/63/70/-2/0.14/.../.. 28 S AERO 35 MPH 7/30 86/68/77/+5/0.00/.../.. 25 NW AERO 32 MPH 7/31 87/64/76/+4/0.00/.../.. 24 W AERO 28 MPH 8/1 morning low 69F; normal low is 63F DAILY RECORDS FOR JULY 2011 7/22 - RECORD HIGH MAXIMUM TEMPERATURE OF 99F; ties the previous record of 99F set in 1926 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR AUGUST 1 HIGH 97F IN 1917 LOW 49F IN 1891 PRECIP 3.61 INCHES IN 1927 PEAK GUST 41 MPH NNW IN 1985 RECORDS FOR AUGUST 2 HIGH 101F IN 1975 [STATION RECORD MAXIMUM - Tied with 8/10/1949] LOW 50 IN 1929, 1947 PRECIP 1.59 INCHES IN 1946 PEAK GUST 50 MPH SW IN 2006 TODAY'S REPORT PREPARED BY: Robert Skilling/Patrick Peters