Arizona, United States of America · population 128,422 · 237 weather stations within 200 km · records 1849 to 2025
Surprise has an average annual daytime high of 29.7°C, based on the 1951 to 1980 baseline. Its warmest month is July, when highs typically reach 40.8°C, and its coldest is January, with overnight lows near 3.9°C.
These figures reflect annual averages, not single-day records. Daily observations are outside this dataset's precision.
Since 1900, Surprise's average temperature has risen by +1.6°C. Compared to the earliest station records that begin in 1849, warming totals +2.1°C.
20-year smoothed annual temperature reconstructed from station anomalies. Dashed line: 1951–1980 baseline.
Daytime highs sit within a comfortable 15°C to 26°C range.
Surprise's average annual daytime high is 29.7°C, based on the 1951 to 1980 baseline period. The warmest month is July, with highs averaging 40.8°C, and the coldest is January, with lows averaging 3.9°C.
July is the warmest month in Surprise, with typical daytime highs of 40.8°C.
2020 is the hottest year on record for Surprise, running +2.0°C above the 1951 to 1980 baseline.
Yes. Since 1900, Surprise has warmed by roughly +1.6°C.
January to December typically offers the most comfortable daytime highs, in the 15°C to 26°C range.
Baseline period 1951 to 1980. Monthly averages are the mean of station observations weighted by proximity. Warming trend is the 20-year smoothed anomaly against that baseline.