Temperature of Venus
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Venus Surface Temperature: Global Patterns and Extremes
Recent global mapping of Venus’s nightside surface temperature shows that the planet’s surface is extremely hot, with an average temperature of about 698 K (425°C). This temperature does not change much with latitude because only a small fraction of solar energy reaches the surface. However, higher altitude regions are relatively cooler than lower ones, and the main temperature differences across the surface are due to heat transport within the planet’s lithosphere. Overall, surface temperatures can vary by about 230 K across the planet . Other studies confirm that the surface temperature is remarkably high, with values near 730 K (457°C) being well established . Early spectroscopic and radio observations also indicated that the surface temperature exceeds 500°C and is likely between 514 K and 700 K, depending on the region and atmospheric conditions .
Venus Atmospheric Temperature Structure
Lower Atmosphere and Cloud Layers
The lower atmosphere of Venus is characterized by high temperatures and a near-adiabatic temperature gradient, meaning the temperature decreases steadily with altitude. The thick cloud cover reflects most sunlight, but enough solar energy penetrates to the lower atmosphere and is trapped by the dense carbon dioxide, creating a strong greenhouse effect that accounts for the high surface temperatures 78. The temperature near the cloud tops, at altitudes of 64–67 km, is much cooler, with brightness temperatures measured at 233–244 K (about -40°C to -30°C) .
Upper Mesosphere and Thermosphere
In the upper mesosphere and lower thermosphere, temperatures are much lower than at the surface. Measurements from spacecraft and ground-based observations show that at altitudes around 100–150 km, daytime temperatures peak at about 195 K near the subsolar point and decrease with latitude and local time . At around 110 km altitude, temperatures can range from 160 K near the terminator and poles to 250 K at the subsolar point, showing strong dependence on local time and latitude . These upper atmospheric temperatures are stable over time but can experience brief episodes of heating or cooling .
Day-Night and Regional Variations
The difference in temperature between the day and night sides of Venus is small at the surface, due to the planet’s thick atmosphere and high heat capacity, which distribute heat efficiently around the planet . However, in the upper atmosphere, there is a thermal gradient of about 35 K between the subsolar (day) and antisolar (night) points . Surface temperatures are more influenced by altitude and lithospheric processes than by day-night cycles .
Conclusion
Venus is one of the hottest planets in the solar system, with surface temperatures averaging around 698–730 K (425–457°C) and little variation with latitude or time of day. The high temperatures are caused by a dense carbon dioxide atmosphere that traps heat through a powerful greenhouse effect. While the surface remains uniformly hot, the upper atmosphere is much cooler and shows more variation with altitude, latitude, and local time. These findings highlight the extreme and unique thermal environment of Venus.
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