Fort Collins experiences cold winters with temperatures often below freezing, especially in January and February when lows can drop as low as -29°C. Spring arrives in March, bringing mild temperatures that gradually warm up through April and May, with average highs reaching around 28°C by the end of May. Summer is warm but not extremely hot, with highs rarely exceeding 40°C, while autumn brings a slight cooling trend before winter's chill sets back in. Overnight lows can still be quite cold, especially in November and December, but daytime temperatures remain relatively mild. Overall, the temperature fluctuations are moderate, with average annual temperatures ranging from just below freezing to warm summer highs.