Spring is Coming! Climate Central Shares Communications Tools
March 4, 2021
Ready or not, next week brings us the first day of March and the beginning of meteorological spring. In our analysis of 243 cities across the U.S., 120 cities (49%) have recorded an increase in average spring temperatures of 2℉ or more over the past fifty years. Further, 96% of cities (234) reported an increase in the number of above-normal spring days since 1970, with 81% of cities (196) reporting an increase of 5 days or more.
In anticipation of spring—the retreat of snow, blooming of flowers and warming temperatures—we’ve bundled together your favorite seasonal trends. They are:
Spring average temperature trends locally and nationally
Change in the number of spring days with above normal temperatures
We just experienced a spate of winter storms and record-breaking cold air plunging across the middle of the country, precipitating the massive power failure in Texas, as well as the opening of emergency warming centers across states from Virginia to Louisiana. There is evidence to suggest that climate change can influence the tropospheric polar vortex, allowing the polar jet stream to break down and allow arctic air to dip into the lower latitudes. But, ready or not, the beginning of March next week also means the start of meteorological spring.
Long-term temperature trends show that, on average, spring is getting warmer. According to our analysis of 243 cities across the U.S., 120 cities (49%) have recorded an increase of 2℉ or more over the past fifty years. Further, 96% of cities (234) reported an increase in the number of above-normal spring days since 1970, with 81% of cities (196) reporting an increase of 5 days or more.
When is spring blooming near you?
Meteorological spring arrives in a few days, but the signs of spring have their own schedule! Check out the “springcasting” tools at USA National Phenology Network, an organization of citizen scientists, government agencies, non-profit groups and others, who monitor seasonal changes in the natural world. USA-NPN tracks the onset of spring across the country and has historical, real-time, and forecasted phenology maps. These are important tools for forecasting invasive species and pests, allergy outbreaks, and informing agricultural calendars. The Asthma and Allergy Foundation of American (AAFA) just released their annual ‘Allergy Capitals’ report. Read their report to find out how your city ranks
Tools for reporting on phenology in your local area:
“Phenology” is the study of the timing of natural events. In spring, it’s the time that snow begins to melt and flower buds appear. Citizen or volunteer scientists are essential for tracking the seasonal changes in plants and animals, and USA-NPN’s Nature’s Notebook website provides all the tools necessary for locals to start recording their observations.
Displayed trend lines are based on a mathematical linear regression. Climate Central’s local analyses include 246 stations. However, for data summaries based on linear trends, only 243 stations are included due to large data gaps in Tuscaloosa, Hazard and Wheeling.