Climate News — anomaly tracker
Where the weather is running hot, cold, or right on baseline. We compare the past 30 days of actual conditions to each city's 30-year climate average — same month, same place. Updated weekly.
🇳🇴 Tromsø, Norway
Running 4.8°C warmer than typical for May. The past 30 days have averaged 11.8°C against a 30-year baseline of 7°C.
See Tromsø climate →🔥 Top 8 running warmest vs typical
❄️ Top 8 running coolest vs typical
🌍 Regional rollup
Average anomaly per world region — quick read on where the broader patterns are running.
How this is built
Every Sunday at 6 AM, our cron job pulls the last 30 days of daily-max temperatures from Open-Meteo's archive for 113 climate-sample cities, averages each to a single number, and compares it to that city's 30-year baseline for whichever calendar month dominates the window. The deltas you see above are pure data.
Single-month windows are noisy — strong signals (≥3°C) flag real anomalies; smaller ones (<1°C) are within typical year-to-year variation. Use this as a trend tracker, not a forecast.