Blue Hill Observatory & Science Center, Great Blue Hill, Milton
Day51,968
On Saturday, May 15, 2027, observers on Great Blue Hill will record day 51,968 of a weather record unbroken since February 1, 1885. Climb up during Climate Week and be there for it.
Climate change is measured, not guessed. On this summit it has been measured every day for 142 years.
That record is one of the longest anywhere and one of the clearest pictures of how New England’s climate is changing. Climb for Climate brings people to the place it is kept, during the week the world talks about climate.
Meet the people who keep the record, see the instruments, and take in the view from the top of the hill.
February 1, 1885First observation on the summit
142 yearsOf daily records, the longest continuous weather record in the Western Hemisphere
635 feetSummit of Great Blue Hill, the highest point in the Blue Hills
At the Blue Hill Ski Area and Trailside Museum lot on Route 138. Check-in opens at 9:15 AM, and you can start your climb any time between 10 AM and 3 PM.
Take the paved Summit Road or the rockier Red Dot Trail. Most people reach the top in 20 to 30 minutes.
See the instruments that have measured the weather here since 1885, and meet the observers who read them.
Activities on weather and climate for all ages, and on a clear day, the view to Boston.
Proceeds bring young people into climate science, especially students who have not had the chance.
Put your company’s name on Climate Week at a National Historic Landmark. Sponsorship levels for 2027 are being set now, and early sponsors help shape the day.
Comfortable walking or hiking shoes and layers. The summit is often cooler and windier than the parking lot. Bring a water bottle.
At the Blue Hill Ski Area and Trailside Museum lot on Route 138 in Milton. Check-in opens at 9:15 AM and stays open through the day. Climb any time between 10 AM and 3 PM.
The climb happens rain or shine. If severe weather is coming, registered climbers will get an email with any changes ahead of time.
The routes are steep, outdoor terrain. If you need accommodations or vehicle access to the summit, email events@bluehill.org before the event.
Yes. When registration opens, you can set a personal goal, share your page, and start or join a team.
Email events@bluehill.org and we will let you know when registration opens.
Monthly Skymail, event announcements, and research summaries.
