Sign In Become a Member
Donate
Daily Discussions

Friday, August 15, 2025

August 15, 2025

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA FRIDAY, AUGUST 15, 2025 ALL TIMES ARE…

Agreement required — click “Accept & Continue” below to review and accept the Data Use & Privacy Policy

Access to this content requires acceptance of our Data Use & Privacy Policy.

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA FRIDAY, AUGUST 15, 2025 ALL TIMES ARE IN EASTERN STANDARD TIME (EST) SUNRISE: 0452E SUNSET:  1845E SUNSHINE WITH SOME CLOUDS, MUCH COOLER WITH A BRISK ONSHORE WIND…. A thunderstorm rolled through the area last evening along what appears to have been a backdoor cold front. 0.68″ of rain was measured from this storm, the first rainfall of any kind (including a trace) since the 1st of the month! A much cooler and a bit less humid air mass has taken over giving us a rather pleasant day out there today. Varying amounts of cloud cover passed over the area during the morning hours, but have since mostly moved out leaving us with plenty of sunshine early this afternoon. Temperatures have only reached the mid 70s by early this afternoon, which is a welcomed change from the upper 80s and 90s we experienced earlier in the week. Dew point values are a solid 10F degree lower than yesterday as well, which makes the air feel more refreshing despite values still being in the low 60s. The wind has been rather busy today out of mainly a northeasterly direction. The average speed for the day so far is around 12mph. Gusts have been frequently exceeding 20mph, with a peak gust thus far of 29mph, which occurred just before 9:30am this morning. Visibility has been somewhat limited today due to haziness. The view has been generally in the 30-40 miles range all day. The maximum temperature so far today is 75F degrees, which is 6 degrees below the normal high of 81F. The minimum temperature since midnight is 65F degrees, which is 2 degrees above the normal low of 63F. ————————————————————– Today’s Observations: 7 A.M. Weather: Clear, few stratocumulus distant NW-NE-ENE, few altocumulus castellanus all quadrants Temperature: 69F; Dew Point: 62F; Relative Humidity: 76% Wind: NE @ 9G15 kts Sea-level pressure: 1021.9 mb; 30.18 in. Hg: rising, then more slowly Visibility: 30 miles, hazy 6-hr Max temp: 69F 6-hr Min temp: 65F 24-hr Precip:  0.68 inches BHO SA 1155 CLR 30 219/69/62/0409G15/018/ FEW SC DSNT NW-NE-ENE FEW ACC ALQDS HAZY/ 8/580 51025 70068 10069 20065 10 A.M. Weather: Scattered stratocumulus Temperature: 72F; Dew Point: 61F Relative Humidity: 67% Wind: ENE @ 16G21 kts Sea-level pressure: 1023.2 mb; 30.22 in. Hg: rising, then more slowly Visibility: 35 miles, hazy 3-hr Precip: 0.00 inches BHO SA 1455 30 SCT 35 232/72/61/0616G21/022/ HAZY/ 8/500 51013 1 P.M. Weather: Clear, few cumulus distant WSW-NW, few altocumulus NNE-E and SW-WNW Temperature: 74F Dew Point: 60F; Relative Humidity: 62% Wind: ENE @ 9G16 kts Sea-level pressure: 1023.3 mb; 30.22 in. Hg: steady, then rising Visibility: 40 miles, hazy 6-hr Max temp: 75F 6-hr Min temp: 69F 6-hr Precip:  0.00 inches BHO SA 1755 CLR 40 233/74/60/0609G16/022/ FEW CU DSNT WSW-NW FEW AC NNE-E AND SW-WNW HAZY/ 8/250 53001 10075 20069 ————————————————————– SUMMARY FOR THURSDAY, AUGUST 14, 2025 TEMPERATURE (DEGREES F) MAX…….90   NORMAL…..81 MIN…….68   NORMAL…..63 MEAN……79   NORMAL…..72 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+7 TOTAL DEPARTURE FOR THE MONTH……………………….+3 [ 0.0 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026) TOTAL HEATING UNITS FOR YESTERDAY……………..0  DEPARTURE………0 TOTAL HEATING UNITS FOR THE MONTH……………..0  DEPARTURE……..-3 TOTAL HEATING UNITS FOR THE SEASON…………….1  DEPARTURE……..-9 TOTAL HEATING UNITS LAST SEASON TO DATE………..2  DEPARTURE……..-1 COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025) TOTAL COOLING UNITS FOR YESTERDAY…………….14  DEPARTURE……..+7 TOTAL COOLING UNITS FOR THE MONTH……………110  DEPARTURE……..+3 TOTAL COOLING UNITS FOR THE SEASON…………..621  DEPARTURE……+128 TOTAL COOLING UNITS LAST SEASON TO DATE………620  DEPARTURE……..+1 PEAK WIND GUST (MPH): Note: Instruments designated #1 = Main Tower, #2 = South Tower, F420C, Contacting, Merlin, and Richards are all on Main Tower. E=Estimated F420C (Official)………..35 NE   @   06:01 P.M. VECTOR #1 (1-Sec)……….34 NE   @   06:00 P.M. VECTOR #2 (1-Sec)……….37 NNE  @   06:00 P.M. DAVIS #1……………….33 NE   @   06:01 P.M. DAVIS #2 ………………31 ENE  @   06:16 P.M. RMY #1 (Instantaneous)…..36 NE   @   06:00 P.M. RMY #2 (Instantaneous)…..42 NNE  @   06:00 P.M. MERLIN…………………32 NE RICHARDS (C5C) (Inst)……32      @   06:03 P.M. FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL………………26 NE   @   06:03 P.M. MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..22      @   06:02 P.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..24      @   06:04 P.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………24 E    @   06:16 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………26 E    @   06:16 P.M. MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..22 E    @   06:16 P.M. MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..24 NNE  @   06:04 P.M. MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………22      @   06:16 P.M. AVERAGE WIND SPEED AND DIRECTION: CONTACTING/OFFICIAL………6.3 SW [152 total miles] VECTOR #1……………….7.1 VECTOR #2……………….7.2 DAVIS #1………………..6.7 SSW DAVIS #2………………..6.8 SSW RMY #1………………….6.9 SW RMY #2………………….7.2 SW RICHARDS (C5C)…………..7.2 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.68 DEPARTURE…..+0.55 TOTAL PRECIPITATION FOR THE MONTH…………..1.12 DEPARTURE…..-0.71 TOTAL PRECIPITATION FOR THE YEAR (2025)…….30.57 DEPARTURE…..-1.96 ————————————————————– PRELIMINARY CLIMATE SUMMARY FOR AUGUST CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST PEAK GUST: F420C (Official) VEC1: Vector #1 1-second gust RMY:  R.M. Young #1 wind gust recording system (Instantaneous) TSTM: Thunderstorm day (thunder heard some time during day) ….: Data not yet available, records not finalized M:    Missing data 8/1   71/57/64/-9/0.44/546/63            28 NE  VEC1 28 NE  RMY 27 8/2   75/54/65/-8/0.00/838/97            18 NNW VEC1 18 NNW RMY 18 8/3   83/59/71/-2/0.00/784/91            21 SSW VEC1 21 SSW RMY 21 8/4   84/61/73/0/0.00/757/88             17 W   VEC1 17 W   RMY 17 8/5   73/62/68/-5/0.00/480/56            28 NE  VEC1 27 NE  RMY 28 8/6   77/61/69/-4/0.00/248/29            17 ENE VEC1 17 ENE RMY 16 8/7   81/61/71/-2/0.00/665/78            18 ESE VEC1 18 ESE RMY 17 8/8   83/61/72/0/0.00/834/98             21 SSW VEC1 21 SSW RMY 21 8/9   83/60/72/0/0.00/814/96             22 S   VEC1 22 SSW RMY 22 8/10  89/61/75/+3/0.00/761/90            22 S   VEC1 22 S   RMY 21 8/11  94/67/81/+9/0.00/792/94            20 W   VEC1 19 W   RMY 19 8/12  93/68/81/+9/0.00/806/96            21 SSW VEC1 21 SSW RMY 21 8/13  88/66/77/+5/0.00/344/41            25 SW  VEC1 25 SW  RMY 25 8/14  90/68/79/+7/0.68/…/..            35 NE  VEC1 34 NE  RMY 36 TSTM 8/15 The low since midnight is 65F, the daily normal low is 63F. ————————————————————– AUGUST DAILY RECORDS TO DATE NONE. ————————————————————– DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR AUGUST 15 HIGH 95F IN 1928 LOW 47F IN 1964 PRECIP 1.89 INCHES IN 2011 PEAK GUST 44e MPH S IN 1941, 44 MPH N IN 2024 RECORDS FOR AUGUST 16 HIGH 95F IN 1944 LOW 50F IN 1927 PRECIP 1.31 INCHES IN 1951 PEAK GUST 45e MPH N IN 1951 TODAY’S REPORT PREPARED BY: MFD
facebookShare on Facebook
TwitterPost on X
FollowFollow us
PinterestSave
←
→
Blue Hill Observatory & Science Center · Legal

Data Use & Privacy Policy

Please read the full Policy before accessing Observatory data · Effective January 1, 2025

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
Part I — Data Use Policy
§ 01

Ownership and Proprietary Rights

All observational records, compiled datasets, metadata, database structures, and related materials provided by the Blue Hill Observatory & Science Center are the exclusive property of the Blue Hill Observatory & Science Center. The Observatory has maintained continuous weather observations at the summit of Great Blue Hill since 1885, and the entirety of that record — its compilation, structure, curation, and organization — constitutes a proprietary database protected under applicable United States law, including copyright law and common law database protections.

All rights not expressly granted in this Policy are reserved by the Observatory. No access to or use of Observatory data shall be construed as a waiver of any rights or as a license to use data beyond the scope expressly stated herein.

§ 02

Governing Law and Jurisdiction

This Policy shall be governed by and construed in accordance with the laws of the Commonwealth of Massachusetts, without regard to its conflict of law provisions. For interactions with international users, this Policy shall apply to the maximum extent permitted by applicable local law.

Any dispute arising from or related to this Policy shall be subject to the exclusive jurisdiction of the state and federal courts located in Norfolk County, Massachusetts. By accessing Observatory data, all users consent to personal jurisdiction in Massachusetts and waive any objection to the venue or inconvenience of such forum.

§ 03

Permitted Uses

Observatory data are made available for the following limited, non-commercial purposes only:

  • Personal study and analysis
  • Educational classroom use
  • Student projects
  • Non-commercial academic research
  • Publication of analyses, figures, models, or conclusions derived from the data, subject to the attribution requirements of Section 4

All other uses require prior written authorization from the Observatory.

§ 04

Attribution Requirement

Any use of Observatory data in any published, presented, or publicly distributed work must include the following verbatim acknowledgment:

“Data provided by the Blue Hill Observatory & Science Center, Milton, Massachusetts. Continuous weather observations since 1885.”

Failure to include proper attribution is a material violation of this Policy.

§ 05

Prohibited Uses

Unless explicitly authorized in writing, Users may not:

  • Resell, license, sublicense, or commercially exploit Observatory data in any form
  • Redistribute the dataset in whole or in part to any third party
  • Publish the dataset for download by third parties
  • Host, mirror, or archive the dataset on any external website, repository, or storage service
  • Upload the dataset to any public or institutional data repository
  • Provide the data through APIs, automated services, or subscription platforms
  • Incorporate the data into any commercial product, software, application, or service
  • Use the data for AI or machine learning systems intended for commercial use or external distribution
  • Use the data to create derivative datasets that enable reconstruction of the underlying observations
§ 06

Commercial Licensing

Organizations seeking to use Observatory data for commercial purposes must obtain a license prior to any such use. Licensing inquiries: data@bluehill.org.

§ 07

Automated Access

Automated scraping, bulk harvesting, or systematic downloading of Observatory data is strictly prohibited without prior written authorization.

§ 08

Enforcement and Remedies

Violation of this Policy may result in immediate revocation of data access, pursuit of legal remedies available under United States law, and referral to applicable authorities. The Observatory reserves all rights to seek injunctive relief, damages, and attorneys’ fees in connection with any unauthorized use of its data.

Part II — Privacy Policy
§ 09–10

Scope & Information Collected

This section governs the collection, use, storage, and disclosure of personal information from visitors to the Blue Hill Observatory website and users of its data services. The Observatory may collect contact information (name, email, organization) when voluntarily submitted, usage data including IP addresses and pages visited, and data download records.

§ 11–12

How We Use Information & Retention

Information is used solely for: responding to inquiries and licensing requests; monitoring and enforcing compliance with this Policy; improving website performance; and communicating Observatory news to opted-in users. The Observatory does not sell, rent, or share personal information with third parties for marketing purposes. Data access records may be retained indefinitely for compliance and enforcement purposes.

§ 13

International Users and Data Transfers

The Observatory is located in the United States. International users acknowledge their information will be processed in the United States under U.S. law. Users requiring specific data processing agreements under non-US law must contact data@bluehill.org before accessing data.

§ 14–16

Cookies, Security & Children’s Privacy

The Observatory website may use cookies for analytics and functionality. By continuing to use the site, users consent to cookie use. The Observatory implements reasonable measures to protect personal information but cannot guarantee absolute security. Observatory data services are not directed at children under 13.

Part III — General Provisions
§ 17–20

Modifications, Severability, Entire Agreement & Contact

The Observatory reserves the right to modify this Policy at any time. Updated versions will be posted at bluehill.org. Continued use of Observatory data following any modification constitutes acceptance of the revised Policy. This Policy constitutes the entire agreement between the User and the Observatory. Questions and licensing inquiries: Blue Hill Observatory & Science Center, Milton, Massachusetts — data@bluehill.org

By accessing, downloading, or using any Blue Hill Observatory data or services, you acknowledge that you have read, understood, and agree to be bound by this Policy.
Effective January 1, 2025 · Blue Hill Observatory & Science Center · Milton, Massachusetts
↓ Scroll to read the full Policy — the agreement checkbox will unlock at the bottom
Main Menu