Cancun is much warmer than than Dulles. On average, Cancun is 81.1°F while Dulles is 55.3°F, a difference of 25.8°F. Cancun is warmest on average in August, when the average high temperature is 90.0°F, while Dulles is warmest in July, when the average high temperature is 90.0°F. Cancun and Dulles both are coolest in January, when the average low temperature is 67.8°F in Cancun and 23.9°F in Dulles.
Cancun has more precipitation than Dulles. On average, Cancun has 51.2 in. of precipitation while Dulles has 41.5 in., a difference of 9.7 inches.
Use the menu below to compare and chart different weather types for Cancun and Dulles.
Average Dew Point ( �F ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 68.0 | 68.0 | 69.0 | 71.0 | 73.0 | 76.0 | 76.0 | 76.0 | 75.0 | 73.0 | 71.0 | 69.0 | 72.0 |
Dulles | 22.2 | 24.2 | 30.3 | 40.3 | 51.8 | 61.5 | 65.3 | 64.1 | 57.6 | 45.9 | 35.2 | 26.5 | 43.9 |
Average Evening Relative Humidity ( % ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 75.0 | 73.0 | 72.0 | 69.0 | 71.0 | 73.0 | 70.0 | 70.0 | 75.0 | 74.0 | 75.0 | 75.0 | 73.0 |
Dulles | 57.0 | 52.0 | 49.0 | 46.0 | 53.0 | 54.0 | 54.0 | 55.0 | 55.0 | 52.0 | 54.0 | 57.0 | 53.0 |
Average Morning Relative Humidity ( % ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 86.0 | 85.0 | 85.0 | 84.0 | 83.0 | 84.0 | 84.0 | 86.0 | 85.0 | 86.0 | 86.0 | 86.0 | 85.0 |
Dulles | 77.0 | 77.0 | 78.0 | 77.0 | 82.0 | 84.0 | 86.0 | 89.0 | 89.0 | 88.0 | 82.0 | 78.0 | 82.0 |
Average Precipitation ( in ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 4.1 | 2.0 | 1.8 | 1.1 | 3.5 | 5.6 | 2.7 | 3.4 | 7.2 | 11.1 | 5.0 | 3.5 | 51.2 |
Dulles | 2.7 | 2.7 | 3.4 | 3.5 | 4.6 | 4.0 | 3.7 | 3.5 | 3.9 | 3.3 | 3.4 | 3.0 | 41.5 |
Average Number of Rainy Days ( Days ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 9.5 | 5.6 | 5.1 | 3.9 | 6.7 | 11.0 | 8.9 | 9.4 | 13.6 | 16.8 | 11.3 | 10.1 | 111.9 |
Dulles | 10.0 | 9.0 | 10.0 | 10.0 | 12.0 | 10.0 | 11.0 | 10.0 | 9.0 | 8.0 | 9.0 | 10.0 | 117.0 |
Average High Temperature ( �F ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 81.0 | 82.0 | 84.0 | 85.0 | 88.0 | 89.0 | 90.0 | 90.0 | 89.0 | 87.0 | 84.0 | 82.0 | 86.0 |
Dulles | 42.5 | 46.4 | 55.5 | 66.7 | 75.1 | 83.8 | 87.9 | 86.6 | 79.4 | 68.2 | 57.5 | 46.0 | 66.4 |
Average Low Temperature ( �F ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 67.8 | 68.7 | 70.2 | 72.9 | 75.2 | 76.5 | 76.6 | 76.3 | 75.7 | 74.1 | 71.6 | 69.3 | 72.9 |
Dulles | 23.9 | 26.0 | 32.9 | 42.1 | 51.2 | 61.0 | 65.5 | 64.2 | 56.3 | 43.8 | 35.3 | 27.1 | 44.2 |
Average Number of Days Above 90F/32C ( Days ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 1.0 | 3.0 | 10.0 | 17.0 | 24.0 | 25.0 | 17.0 | 7.0 | 1.0 | 105.0 | |||
Dulles | 0.3 | 1.1 | 5.6 | 11.6 | 8.9 | 2.7 | 0.1 | 30.3 |
Average Temperature ( �F ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 75.4 | 77.0 | 78.8 | 81.3 | 83.8 | 84.6 | 85.3 | 85.5 | 84.2 | 81.7 | 78.8 | 76.5 | 81.1 |
Dulles | 33.2 | 36.2 | 44.2 | 54.4 | 63.2 | 72.4 | 76.7 | 75.4 | 67.9 | 56.0 | 46.4 | 36.6 | 55.3 |
Highest Recorded Temperature ( �F ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 95.0 | 90.0 | 91.0 | 97.0 | 99.0 | 102.0 | 102.0 | 100.0 | 102.0 | 102.0 | 99.0 | 88.0 | 102.0 |
Dulles | 75.0 | 79.0 | 89.0 | 93.0 | 97.0 | 102.0 | 105.0 | 104.0 | 99.0 | 94.0 | 84.0 | 79.0 | 105.0 |
Lowest Recorded Temperature ( �F ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 55.4 | 53.6 | 49.1 | 57.2 | 64.4 | 68.9 | 69.8 | 69.8 | 66.2 | 59.0 | 53.6 | 53.6 | 49.1 |
Dulles | -18.0 | -14.0 | -1.0 | 17.0 | 28.0 | 36.0 | 41.0 | 38.0 | 30.0 | 15.0 | 9.0 | -4.0 | -18.0 |
Average Length of Day ( Hours ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 11.4 | 11.9 | 12.4 | 13.0 | 13.6 | 13.8 | 13.7 | 13.2 | 12.6 | 12.0 | 11.5 | 11.3 | 12.5 |
Dulles | 10.3 | 11.2 | 12.4 | 13.7 | 14.8 | 15.4 | 15.1 | 14.1 | 12.8 | 11.6 | 10.5 | 10.0 | 12.7 |
Average Number of Days With Fog ( Days ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.5 | |||||||
Dulles | 13.0 | 10.0 | 12.0 | 10.0 | 14.0 | 16.0 | 19.0 | 20.0 | 18.0 | 14.0 | 12.0 | 12.0 | 170.0 |
Average Wind Speed ( mph ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 9.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 9.0 | 9.0 | 9.0 | 9.0 | 9.0 | 9.0 | 9.0 |
Dulles | 7.8 | 8.0 | 8.6 | 8.1 | 7.0 | 6.3 | 5.9 | 5.6 | 6.0 | 6.3 | 7.0 | 7.3 | 7.0 |
Cooling Degree Days ( Days ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 291.4 | 292.4 | 375.1 | 418.5 | 514.6 | 532.5 | 567.3 | 562.7 | 520.5 | 482.1 | 384.0 | 330.2 | 5271.3 |
Dulles | 3.0 | 17.0 | 72.0 | 237.0 | 363.0 | 324.0 | 141.0 | 19.0 | 2.0 | 1178.0 |
Growing Degree Days ( Days ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 756.4 | 716.1 | 840.1 | 868.5 | 979.6 | 982.5 | 1032.3 | 1027.7 | 970.5 | 947.1 | 834.0 | 795.2 | 10750.0 |
Dulles | 9.0 | 9.0 | 53.0 | 181.0 | 410.0 | 672.0 | 828.0 | 787.0 | 536.0 | 218.0 | 64.0 | 14.0 | 3780.0 |
Average Number of Days With Thunderstorms ( Days ) | |||||||||||||
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City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 0.1 | 0.1 | 0.1 | 0.2 | 0.3 | 0.1 | 0.2 | 0.2 | 0.3 | 0.3 | 0.1 | 2.0 | |
Dulles | 1.0 | 2.0 | 4.0 | 6.0 | 6.0 | 5.0 | 2.0 | 1.0 | 1.0 | 28.0 |
Average Daily Solar Radiation - Diffuse ( kWh/m2 ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 1.2 | 1.4 | 1.6 | 1.8 | 2.0 | 2.2 | 2.1 | 2.0 | 1.9 | 1.6 | 1.3 | 1.2 | 1.7 |
Dulles | 0.8 | 1.1 | 1.5 | 2.0 | 2.3 | 2.5 | 2.4 | 2.1 | 1.7 | 1.2 | 0.9 | 0.7 | 1.6 |
Average Daily Solar Radiation - Direct ( kWh/m2 ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 5.7 | 6.6 | 6.9 | 7.3 | 6.9 | 6.0 | 6.7 | 6.6 | 5.9 | 5.8 | 5.8 | 5.4 | 6.3 |
Dulles | 3.1 | 3.7 | 4.1 | 4.4 | 4.7 | 4.8 | 4.9 | 4.6 | 4.6 | 4.6 | 3.5 | 2.9 | 4.2 |
Average Daily Solar Radiation - Global ( kWh/m2 ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 4.3 | 5.2 | 6.1 | 6.8 | 6.9 | 6.4 | 6.8 | 6.5 | 5.8 | 5.1 | 4.5 | 4.0 | 5.7 |
Dulles | 2.0 | 2.8 | 3.7 | 4.7 | 5.3 | 5.6 | 5.6 | 5.0 | 4.3 | 3.4 | 2.2 | 1.7 | 3.9 |
Average Daily Solar Radiation - Reflected ( kWh/m2 ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 5.2 | 6.0 | 6.4 | 6.6 | 6.3 | 6.4 | 6.7 | 6.2 | 5.9 | 5.7 | 5.4 | 4.8 | 6.0 |
Dulles | 3.1 | 3.7 | 4.3 | 4.7 | 4.9 | 4.9 | 5.0 | 4.8 | 4.7 | 4.5 | 3.4 | 2.9 | 4.3 |
Maximum Daily Solar Radiation - Diffuse ( kWh/m2 ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 1.4 | 1.6 | 1.8 | 2.1 | 2.5 | 2.5 | 2.5 | 2.2 | 2.0 | 1.7 | 1.4 | 1.3 | 1.9 |
Dulles | 0.8 | 1.2 | 1.6 | 2.1 | 2.4 | 2.5 | 2.5 | 2.2 | 1.7 | 1.3 | 0.9 | 0.8 | 1.7 |
Maximum Daily Solar Radiation - Direct ( kWh/m2 ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 6.8 | 7.6 | 7.9 | 8.4 | 8.3 | 7.1 | 8.1 | 7.7 | 7.9 | 6.9 | 7.0 | 6.8 | 7.5 |
Dulles | 3.9 | 5.2 | 5.5 | 5.6 | 6.4 | 6.6 | 5.8 | 5.6 | 6.0 | 6.4 | 4.8 | 3.6 | 5.4 |
Maximum Daily Solar Radiation - Global ( kWh/m2 ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 4.3 | 5.2 | 6.1 | 6.8 | 6.9 | 6.4 | 6.8 | 6.5 | 5.8 | 5.1 | 4.5 | 4.0 | 5.7 |
Dulles | 2.0 | 2.8 | 3.7 | 4.7 | 5.3 | 5.6 | 5.6 | 5.0 | 4.3 | 3.4 | 2.2 | 1.7 | 3.9 |
Maximum Daily Solar Radiation - Reflected ( kWh/m2 ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 5.9 | 6.6 | 6.9 | 7.1 | 6.9 | 7.0 | 7.4 | 6.7 | 6.9 | 6.3 | 6.0 | 5.5 | 6.6 |
Dulles | 3.7 | 4.6 | 5.3 | 5.4 | 5.8 | 5.7 | 5.4 | 5.4 | 5.5 | 5.7 | 4.3 | 3.4 | 5.0 |
Minimum Daily Solar Radiation - Diffuse ( kWh/m2 ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 1.1 | 1.2 | 1.4 | 1.6 | 1.8 | 2.1 | 1.8 | 1.8 | 1.5 | 1.4 | 1.1 | 1.0 | 1.5 |
Dulles | 0.8 | 1.0 | 1.4 | 1.9 | 2.2 | 2.3 | 2.3 | 2.0 | 1.5 | 1.0 | 0.8 | 0.7 | 1.5 |
Minimum Daily Solar Radiation - Direct ( kWh/m2 ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 3.8 | 5.0 | 5.7 | 5.6 | 3.6 | 3.8 | 3.7 | 5.5 | 4.5 | 4.7 | 4.8 | 4.2 | 4.6 |
Dulles | 2.3 | 2.4 | 2.7 | 3.3 | 2.0 | 3.4 | 3.9 | 3.6 | 3.4 | 3.0 | 1.9 | 1.8 | 2.8 |
Minimum Daily Solar Radiation - Global ( kWh/m2 ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 3.5 | 4.5 | 5.5 | 6.0 | 5.0 | 5.1 | 5.0 | 6.0 | 5.1 | 4.6 | 4.1 | 3.5 | 4.8 |
Dulles | 1.7 | 2.2 | 3.0 | 4.0 | 3.5 | 4.7 | 5.0 | 4.4 | 3.7 | 2.7 | 1.6 | 1.3 | 3.2 |
Minimum Daily Solar Radiation - Reflected ( kWh/m2 ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 4.1 | 5.1 | 5.8 | 5.8 | 4.7 | 5.0 | 4.9 | 5.7 | 5.1 | 5.0 | 4.8 | 4.1 | 5.0 |
Dulles | 2.5 | 2.8 | 3.4 | 4.0 | 3.3 | 4.2 | 4.5 | 4.2 | 3.9 | 3.4 | 2.2 | 2.0 | 3.4 |
Average Number of Days Above 80F/26C ( Days ) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
Cancun | 20.0 | 21.0 | 26.0 | 29.0 | 31.0 | 30.0 | 31.0 | 31.0 | 30.0 | 30.0 | 28.0 | 23.0 | 330.0 |
Dulles | 0.8 | 3.8 | 10.1 | 22.3 | 27.9 | 27.1 | 14.1 | 3.1 | 0.3 | 109.6 |