In-depth Data Analysis
Choose a question, pick a place, and explore what the records show.
Similarity Map
Which places have a climate like my city?
Sources, calculations & limitations
Daily observations: NOAA GHCN-Daily. Baseline: NOAA 1991–2020 monthly normals for the same station. Station reports may be missing, delayed, or revised. Quality-flagged observations and missing-presumed-zero values are excluded; trace amounts retain their reported zero numerical value.
Temperature means require at least 90% daily coverage; annual means also require 80% coverage in every month. Rain and snow totals, and threshold bars, require all days. Incomplete threshold counts in the table are observed counts only. No missing day is treated as zero. Analysis uses complete calendar years; snowfall totals here are January–December, not winter seasons.
Trends are ordinary least-squares fits to at least 10 usable annual values spanning 10 calendar years, expressed per decade. R² describes the fit, not statistical significance. These station series are not homogenized for moves, instruments, or land-use changes; a slope alone does not establish a climatic cause. Five-year averages require five consecutive usable years.
Anomalies subtract the corresponding station’s monthly normal in absolute units. Gray cells and markers indicate missing normals or insufficient observations. Heatmap colors saturate at ±5°C for temperature, ±100 mm for precipitation, and ±200 mm for snowfall; each cell exposes its exact value.
Similarity compares 12 monthly normals using weighted root-mean-square differences. Temperature uses highs and lows scaled by 10°F; precipitation by 2 inches; snowfall by 10 inches. The index is 100 ÷ (1 + distance), not a probability. Enabled groups require complete normals. Matches are at least 100 km from your city’s station and 75 km apart; the closest 24 are mapped.
Regional tools sample up to 12 geographically spread catalog stations with complete normals for the selected metric. The station near your chosen city is included when eligible and inside the region. Historical coverage and fitted time spans may differ between stations. Regional medians summarize available sampled station results; they are not spatial averages or exhaustive rankings. The rectangle does not cross the antimeridian. Map boundaries and tiles come from OpenStreetMap.