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Boise Breaks 100-Year Temperature Record — Snowless Christmas Likely

Boise made weather history on December 18, shattering a century-old record for the highest temperature on that date. According to the National Weather Service (NWS) in Boise, temperatures peaked at 59 degrees Fahrenheit, narrowly surpassing the previous record of 58 degrees set in 1917.

A Warm December Surprise

This unusual warmth can be attributed to a combination of factors. Breezy southeast winds kept the morning temperatures elevated, while abundant sunshine during the day boosted the mercury even higher. By 2:30 p.m., the NWS had already announced the record-breaking temperature on X, formerly Twitter. However, meteorologist Korri Anderson confirmed to the Idaho Statesman that the day’s peak temperature of 59 degrees was reached just before 4 p.m.

For perspective, the average high temperature for Boise on December 18 is typically around 38 degrees. This makes the 59-degree reading an anomaly, underscoring the unusual weather patterns affecting the region.

What’s Next for Boise Weather?

Anderson noted that temperatures are expected to remain in the low 50s in the coming days, although the wind patterns that contributed to Wednesday’s warmth are unlikely to recur. Unfortunately for snow enthusiasts, the forecast suggests little chance of a white Christmas this year. While precipitation is expected to begin on Saturday and continue through Christmas Day, the temperatures will likely remain too high for snow to accumulate.

A Season Without Snow?

Boise’s warm December is part of a larger trend this winter season. The city has recorded only one-tenth of an inch of measurable snow so far, the latest first snowfall since 1958 when snow finally arrived on December 30. Typically, Boise’s first snowfall occurs around November 22, making this year’s delay particularly notable.

If current weather patterns hold, Boise could be on track to set a new record for the latest measurable snowfall. Anderson also mentioned the possibility of another inversion in the coming week, a phenomenon where cold air gets trapped near the ground under a layer of warmer air. Inversions are common in the Treasure Valley during winter and can lead to prolonged periods of stagnant air and hazy conditions.

A Changing Climate?

This unusual weather raises questions about broader climate trends. While single weather events cannot be directly attributed to climate change, the frequency and intensity of such anomalies align with predictions for a warming planet. Record-breaking warmth during winter months could become more common as global temperatures rise.

What Does This Mean for Residents?

The lack of snow and warm temperatures are already affecting local traditions and activities. Ski resorts in the region may face challenges if the snow doesn’t arrive soon, and holidaymakers hoping for a snowy Christmas could be disappointed. Additionally, prolonged inversions could impact air quality, posing health risks for sensitive groups.

Looking Ahead

While Boise’s warm December is an interesting footnote in the city’s weather history, it’s also a reminder of the unpredictable nature of climate and its impacts on daily life. Whether this season ends up breaking more records remains to be seen, but one thing is clear: Boise’s residents should be prepared for anything as winter continues to unfold.

Stay tuned for updates as we monitor Boise’s weather patterns and potential snowfall in the coming weeks.