BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA   DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, JUNE 24, 2007   ALL TIMES ARE IN EASTERN STANDARD TIME   CLEAR SKY AND SPECTACULAR VISIBILITY TODAY WARMER AND CONTINUED VERY DRY AIR   Visibility is a spectacular 80 to 90 miles plus from the summit today with bright blue sky dotted with only a few small cumulus late this morning and some distant cirrus. The visibility from the summit of Mt. Washington is 100 miles.   Winds have diminished from what we had yesterday and peak speeds are generally under 20 MPH.   Temperatures have already reached 70 degrees late this morning as compared to a high of only 68 degrees yesterday and the dewpoints continue very low down in the 40's.   Today's observations:   7 A.M.   Weather: Clear, few cirrus distant NE-E and S  Temperature: 60F, Dew point: 45F, Wind: W at 08 kts Sea-level pressure: 30.02 inches Hg, rising Visibility: 80 miles 6-hour min temp. 52F   24-hour precip: 0.00 in. BHO SA 1155 CLR 80 166/60/45/2808/002/ FEW CI DSNT NE-E AND S/ 8/001 53018 10060 20052          10 A.M. Weather: Clear, few small cumulus forming, few cirrus (SW-WNW) Temperature: 69F, Dew point: 44F, Wind: W at 11 kts Wind: Variability WSW-NW  Sea-level pressure: 30.03 inches Hg, falling Visibility: 90 miles    BHO SA 1455 CLR 90 170/69/44/2811/003/ FEW CUFRA/SML CU FRMG ALQDS FEW CI DSNT SW-WNW WND 24V31/ 8/101 50004    WEATHER SUMMARY FOR SATURDAY, JUNE 23   TEMPERATURE (DEGREES F) MAX.....68    NORMAL.....77 MIN.....50    NORMAL.....58 MEAN....59    NORMAL.....68 DEPARTURE FROM 30-YEAR NORMAL............ -9 TOTAL DEPARTURE FOR THE MONTH............-19 (-1.0 DEGREES/DAY)   HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............6  DEPARTURE........+ 5 TOTAL HEATING UNITS FOR THE MONTH...........79  DEPARTURE........+12   TOTAL HEATING UNITS FOR THE SEASON........5910  DEPARTURE.......-454 TOTAL HEATING UNITS LAST SEASON TO DATE...5790  DIFFERENCE......+120   PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............33 W AT 11:49 A.M.                       AEROVANE.............34 W AT 11:49 A.M.                     ASOS.................N/A  #                    DAVIS................33 W AT 9:35  A.M.       FASTEST MILE FOR YESTERDAY..............24 WNW AT 11:49 A.M.      MAXIMUM 2-MINUTE ASOS AVERAGE...........N/A  # MAXIMUM 2-MINUTE DAVIS AVERAGE..........25 W   AT 11:50 A.M.         AVERAGE WIND SPEED AND DIRECTION........13.4 WNW                       ASOS.................N/A  #                    DAVIS................13.8 W [280 deg]    # ASOS WINDS SWITCHED OFF BY NWS 6/6, IT IS NOT KNOWN WHEN THAT DATA WILL RESUME   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..........2.64  DEPARTURE.....-0.39                          ASOS..............2.60    TOTAL PRECIPITATION FOR THE YEAR..........26.80  DEPARTURE.....+2.03                          ASOS.............26.24      PRELIMINARY CLIMATE SUMMARY FOR JUNE 2007......CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST   AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available   6/1  87/56/72/+10/0.12/660/73       45 NNW  Aero 44 MPH TSTM AM/PM 6/2  87/64/76/+14/0.01/290/32       23 SSE  TSTM PM    6/3  68/50/59/-3/0.14/000/000       24 NNE  TSTM AM (no rain) 6/4  63/50/57/-6/1.52/000/00        35 NE   TSTM 10:15-10:50 A.M. 6/5  78/57/68/+5/0.01/455/50        38 S   6/6  70/49/60/-3/0/637/70           35 W   6/7  69/44/57/-7/0/528/58           23 W 6/8  78/58/68/+4/0/748/82           20 WSW 6/9  63/54/59/-5/0.02/000/00        18 ENE 6/10 70/50/60/-4/0/831/91           22 ENE  6/11 77/62/70/+5/0.04/594/65        29 NE    6/12 70/56/63/-2/0.09/192/21        29 NNE 6/13 56/50/53/-12/0.01/000/00       42 NNE   Aero 40 MPH NNE 6/14 59/49/54/-11/0/036/04          34 NNE   6/15 69/46/58/-8/0/769/84           21 NNE 6/16 80/55/68/+2/0/577/63           25 SW   6/17 85/58/72/+6/T/632/69           31 W   6/18 79/60/70/+4/0/880/96           23 NW 6/19 84/62/73/+6/0/578/63           25 SSW 6/20 74/60/67/0/0.38/147/16*        25 W 6/21 77/56/67/0/0.23/823/90         30 WSW 6/22 71/54/63/-4/0.06/.../..        37 NW   TSTM 1:15-1:30 P.M. 6/23 68/50/59/-9/0/.../..                     6/24 morning low temp. 52 deg; normal now 58 deg.       * sunshine minutes and percent corrected from zero   to 147 and 16% on 20th   NEW DAILY RECORDS FOR JUNE:    6/4 - NEW RECORD DAILY RAINFALL OF 1.52 INS; THE PREVIOUS       RECORD WAS 1.29 INS. IN 1898.   DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):   RECORDS FOR JUNE 24 HIGH 91F IN 1914,1976 LOW 40F IN 1932 PRECIP 2.80 INCHES IN 1929 PEAK GUST 46 MPH S IN 1985   RECORDS FOR JUNE 25 HIGH 93F IN 1943,1980, 2005 LOW 47F IN 1903 PRECIP 1.10 INS IN 2006 PEAK GUST 51 MPH W IN 1960   TODAY'S REPORT PREPARED By: Robert Skilling