By James Larson
How Stillwater’s Weather Is Shifting
Stillwater residents have likely noticed subtle yet meaningful changes in our local weather over recent decades. Summer warmth now spans roughly May through mid-September, with daily highs over 70°F during that stretch. Winters, on the other hand, tend to be long and cold—November through early March—with many days staying below freezing.
Rain, Snow, and Cloud Cover
Precipitation patterns are changing too. Rainy days are most frequent from April through October, peaking in June, while February is among the driest months. Snow dominates winter months—especially late fall into early spring—and the snowy period in Stillwater stretches over five to six months.
Broader Environmental Trends Impacting Our Region
Lakes Warming and Ice Cover Shrinking
Lakes in Minnesota—including those near Stillwater—are warming dramatically during July and August. On average, lake surface temperatures have risen by over 3°F in recent decades compared to fifty years ago. Ice cover is disappearing earlier in spring and forming later in fall, shortening the frozen period by approximately 10 to 14 days.
Emerging Pressures from Invasive Species
Warmer winters are aiding some invasive pests and plants that used to struggle in harsher cold. The emerald ash borer—already killing ash trees in many Minnesota communities—survives more winters, while aquatic invasives like Eurasian watermilfoil and zebra mussels threaten lakes and shorelines. State regulations now define many species as “prohibited” or “regulated” to help limit movement and reduce impacts.
What These Changes Mean for Stillwater Residents
The shifts in weather and environment affect more than just what to plant or when to bundle up. Here’s how they touch daily life:
- Higher and warmer lakes can mean more algae blooms, affecting swimming and water quality.
- Earlier ice-out impacts winter recreation, fishing habits, and even some fish breeding cycles.
- Heavier rainfall events pose risks of flooding, especially in places where drainage systems are outdated.
- The changing mix of plants and pests means gardeners, forested areas, and natural areas may see more infestations or different species than in past generations.
Steps We Can Take Locally
While some changes are already underway, there are practical measures locals can support or adopt:
- Promote and plant native species in yards, parks, and restorations—these tend to be more resilient to pests and climate swings.
- When boating or using waterfronts, clean your gear and equipment to help prevent spreading invasive aquatic species.
- Support local infrastructure upgrades—stormwater systems, shoreline restoration, and flood-wise building—that can handle heavier precipitation.
- Stay informed through Minnesota DNR programs and local environmental groups. Volunteering for invasive species monitoring or shoreline cleanups can make a difference.
Understanding these long-term shifts helps us adapt, plan, and maintain the health and beauty of Stillwater’s natural environment. Our climate isn’t just a backdrop—it’s what we live in, every day.