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Jamestown vs San Juan Climate & Distance Between

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  • The distance between Jamestown, Saint Helena and San Juan, Puerto Rico is approximately 7,624 km or 4,737 mi.
  • To reach Jamestown in this distance one would set out from San Juan bearing 116.2° or ESE and follow the great circles arc to approach Jamestown bearing 117.7° or ESE .
  • Jamestown has a subtropical hot desert climate (BWh) whereas San Juan has a tropical monsoonal climate (Am).
  • The mean temperature is 3.8 °C (6.8°F) cooler.
  • Average monthly temperatures vary by 0.5 °C (0.9°F) more in Jamestown. The continentality subtype is truly hyperoceanic for both.
  • Total annual precipitation averages 1491 mm (58.7 in) less which is equivalent to 1491 l/m² (36.59 US gal/ft²) or 14,910,000 l/ha (1,593,978 US gal/ac) less. About 0 as much.
  • The altitude of the sun at midday is overall 0.5° higher in Jamestown than in San Juan.
  • Relative humidity levels are 6.9% lower.
  • The mean dew point temperature is 5.2°C (9.4°F) lower.

Climate Comparison Table

The table shows values for Jamestown relative to San Juan. You can also view this comparison the other way around from the perspective of San Juan vs Jamestown.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
maximum temperature iconAverage Max Temperature °C ( °F) +0 (0) +-1 (-2) 0 (0) -2 (-4) -6 (-11) -8 (-14) -9 (-16) -9 (-16) -9 (-16) -8 (-14) -7 (-13) -4 (-7) -5 (-9)
average temperature iconAverage Temperature °C ( °F) +1 (+1) +1 (+1) 0 (0) -1 (-2) -4 (-7) -6 (-11) -7 (-13) -7 (-13) -7 (-13) -7 (-13) -5 (-9) -3 (-5) -4 (-7)
minimum temperature iconAverage Min Temperature °C ( °F) +1 (+2) +2 (+4) +2 (+4) 0 (0) -3 (-5) -5 (-9) -6 (-11) -6 (-11) -6 (-11) -5 (-9) -4 (-7) -2 (-4) -3 (-5)
rainfall iconAverage Precipitation mm (in) -111 (-4) -61 (-2) -36 (-1) -84 (-3) -163 (-6) -126 (-5) -126 (-5) -171 (-7) -167 (-7) -146 (-6) -165 (-6) -135 (-5) -1491 (-59)
rain days iconNumber of Precipitation Days (% chance of precip. on a day ) -13 ( -42) -9 ( -32) -6 ( -19) -11 ( -37) -15 ( -48) -12 ( -40) -13 ( -42) -16 ( -52) -16 ( -53) -16 ( -52) -18 ( -60) -18 ( -58)   -163 ( -45)
daylight iconAverage Daylight Hours & Minutes/ Day +1h 48' +1h 07' +0h 12' -0h 46' -1h 36' -2h 01' -1h 50' -1h 07' -0h 10' +0h 48' +1h 37' +2h 01'   0h 00'
sun altitude iconSun altitude at solar noon on the 21st day (°) +33.5 +22.6 +1.8 -21.4 -34.1 -34.3 -33.9 -21.5 +1.4 +23.1 +33.3 +34.4   +0.5
relative humidity iconRelative Humidity (%) -12 -10 -9 -10 -5 -6 -4 -2 -3 -6 -6 -10   -6.9
dewpoint temperature iconAverage Dew Point Temperature °C & (°F) -2.3 (-4) -1.8 (-3) -2.1 (-4) -3.3 (-6) -5 (-9) -7 (-13) -7.6 (-14) -7.2 (-13) -7.4 (-13) -8 (-14) -6.1 (-11) -4.7 (-8) -5.2 (-9)

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