BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, JULY 9, 2012 ALL TIMES ARE IN EASTERN STANDARD TIME MUCH COOLER AND DRIER WEATHER TODAY LIKELY TO END STREAK OF CONSECUTIVE WARMER THAN NORMAL DAYS... A VERY PLEASANTLY WARM AND VERY DRY DAY TODAY After 11 consecutive warmer than normal days ending with yesterday, it appears today's average temperature will fall on either normal or a degree cooler than normal. Our annual rainfall defecit also continues to grow, as we are once again nearing a rainfall deficit of 10 inches! By week's end, there is a good possibility we will reach that amount as there doesn't appear to be any significant rainfall for this week ahead. After a slightly cooler than normal morning low of 61F, the high temp- erature has reached the low 80's but with dew points in the upper 40's to around 50F the relative humidity is in the very comfortable 30% range and visibility is up to 75 to 80 miles. Today's observations: 7 A.M. Weather: Scattered dense cirrus, cirrus, (3 levels), line of clearing extending WSW-overhead-ENE, sky clearing Temperature: 65F; Dew Point: 54F; Wind: NW at 7 kts, Sea-level pressure: 29.95 in Hg, rising, then more rapidly Visibility: 80 miles, light distant haze 24-hour precip: 0.00 6-hour min. temp: 61F BHO SA 1155 200 SCT 220 SCT E250 BKN 80 142/65/54/3207/995/ ACC DSNT ESE-SSW DNS CI OVHD-E-S SKY CLRG CLRG LINE OVHD XTDNG WSW-ENE CLR SKY W-NE/ 8/082 53016 10066 20061 10 A.M. Weather: Scattered dense cirrus, thin scattered cirrus, few small cumulus forming WSW-NNW, dense cirrus E-S-SW Temperature: 76F; Dew Point: 46F; Wind: NW at 10 kts, Sea-level pressure: 29.95 in Hg, steady Visibility: 80 miles, light distant haze BHO SA 1455 220 SCT 250 亡CT 80 142/76/46/3210/995/ FEW SML CU FRMG DSNT WSW-NNW DNS CI E-S-SW LGT DSNT HZ/ 8/102 55000 1 P.M. Weather: Thin scattered cirrus, small shallow cumulus all quadrants except distant NE-SE, dense cirrus distant ESE-SSW Temperature: 79F; Dew Point 48F; Wind: WNW at 7 kts, Wind: Direction variable WSW-NNW Sea-level pressure: 29.93 in. Hg, falling then more slowly Visibility: 75 miles, light distant haze 6-hour max temp.: 80F BHO SA 1755 250 亡CT 75 136/79/48/2907/993/ SML SHLW CU ALQDS XCPT DSNT NE-SE DNS CI DSNT ESE-SSW WND LGT DSNT HZ WND 24V33 8/102 56006 10080 20065 WEATHER SUMMARY FOR SUNDAY, JULY 8 TEMPERATURE (DEGREES F) MAX.....87 NORMAL.....80 MIN.....66 NORMAL.....63 MEAN....77 NORMAL.....72 DEPARTURE FROM 30-YEAR NORMAL.......................+5 TOTAL DEPARTURE FOR THE MONTH......................+38 [+4.6 DEGREES/DAY] PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............23 W AT 3:20 P.M. AERO..................23 W AT 3:20 P.M. ASOS..................23 NNE AT 10:46 P.M. DAVIS.................22 W AT 3:19 P.M. RMY 25 THE FASTEST MILE FOR YESTERDAY...........14 WNW AT 3:21 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE............17 WNW AT 3:20 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........16 W AT 3:20 P.M. AVERAGE WIND SPEED AND DIRECTION........9.7 WNW ASOS.................9.3 DAVIS................8.9 NW [314 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..........0.38 DEPARTURE...........-0.50 ASOS..............0.36 TOTAL PRECIPITATION FOR THE YEAR..........18.07 DEPARTURE...........-9.78 ASOS.............17.98 PRELIMINARY CLIMATE SUMMARY FOR JULY 2012 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 RMY: RMY = R.M. Young wind gust recording system added 8/9/2011 TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 7/1 89/67/78/+8/0.01/..../.. 33 WSW AERO 32 MPH WSW RMY 34 7/2 84/66/75/+5/T/..../.. 23 W AERO 22 MPH W RMY 23 7/3 85/63/74/+3/0.00/.../.. 23 W AERO 21 MPH W RMY 20 7/4 85/66/76/+5/0.37/.../.. 20 W AERO 20 MPH W RMY 23 7/5 81/68/75/+4/0.00/.../.. 23 NW AERO 23 MPH NW RMY 22 7/6 86/64/75/+4/0.00/.../.. 18 SSW AERO 18 MPH SSW RMY 19 7/7 81/69/75/+4/T/.../.. 23 W AERO 23 MPH W RMY 24 7/8 87/66/77/+5/0.00/.../.. 23 W AERO 23 MPH W RMY 25 7/9 morning low temp: 61F; the normal low is now 63F DAILY RECORDS FOR JULY 2012 None so far. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JULY 9 HIGH 98F IN 1912 LOW 47F IN 1909 PRECIP 3.74 INS IN 1921 WIND 46 MPH NW IN 1992 RECORDS FOR JULY 10 HIGH 99F IN 1911 LOW 46F IN 1890 PRECIP 1.68 INS IN 1933 WIND 75 MPH W IN 1985 TODAY'S REPORT PREPARED BY: Robert Skilling/Patrick Peters If you do not wish to receive this Daily Discussion and Climate Summary from the Blue Hill Observatory, please send an email to sitemaster@bluehill.org.