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Jamestown vs Porto-Nacional Climate & Distance Between

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  • The distance between Jamestown, Saint Helena and Porto-Nacional, Brazil is approximately 4,666 km or 2,900 mi.
  • To reach Jamestown in this distance one would set out from Porto-Nacional bearing 101.9° or ESE and follow the great circles arc to approach Jamestown bearing 91.6° or E .
  • Jamestown has a subtropical hot desert climate (BWh) whereas Porto-Nacional has a tropical wet and dry/ savanna climate with dry winters (Aw).
  • The annual average temperature is 4.3 °C (7.7°F) cooler.
  • Average monthly temperatures vary by 1.4 °C (2.5°F) more in Jamestown. The continentality subtype is truly hyperoceanic as opposed to extremely hyperoceanic.
  • Total annual precipitation averages 1530.9 mm (60.3 in) less which is equivalent to 1530.9 l/m² (37.57 US gal/ft²) or 15,309,000 l/ha (1,636,634 US gal/ac) less. About 0 as much.
  • The altitude of the sun at midday is overall 2.1° lower in Jamestown than in Porto-Nacional.
  • Relative humidity levels are 2.2% lower.
  • The mean dew point temperature is 4.5°C (8°F) lower.

Climate Comparison Table

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

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
maximum temperature iconAverage Max Temperature °C ( °F) -4 (-8) -6 (-10) -3 (-6) -5 (-9) -9 (-16) -10 (-19) -12 (-21) -12 (-22) -14 (-24) -10 (-18) -9 (-16) -7 (-13) -8 (-15)
average temperature iconAverage Temperature °C ( °F) -2 (-3) -2 (-3) -2 (-3) -2 (-4) -4 (-8) -5 (-8) -5 (-10) -7 (-13) -8 (-14) -7 (-12) -5 (-9) -4 (-7) -4 (-8)
minimum temperature iconAverage Min Temperature °C ( °F) -1 (-1) -2 (-3) -2 (-4) -1 (-2) -2 (-3) -1 (-2) -1 (-2) -2 (-4) -5 (-8) -4 (-8) -4 (-7) -3 (-5) -2 (-4)
rainfall iconAverage Precipitation mm (in) -232 (-9) -257 (-10) -252 (-10) -138 (-5) -20 (-1) +11 (+0) +28 (+1) +3 (+0) -47 (-2) -181 (-7) -219 (-9) -227 (-9) -1531 (-60)
rain days iconNumber of Precipitation Days (% chance of precip. on a day ) -16 ( -52) -16 ( -57) -15 ( -48) -10 ( -33) 0 ( 0) +6 (+20) +8 (+26) +2 (+6) -3 ( -10) -11 ( -35) -17 ( -57) -18 ( -58)   -90 ( -25)
daylight iconAverage Daylight Hours & Minutes/ Day +0h 16' +0h 10' +0h 01' -0h 07' -0h 14' -0h 18' -0h 17' -0h 10' -0h 01' +0h 07' +0h 15' +0h 18'   0h 00'
sun altitude iconSun altitude at solar noon on the 21st day (°) +4.7 -3 -5.1 -5.1 -5.1 -5.2 -5.3 -5.3 -5.2 -2.6 +4.6 +5.2   -2.1
relative humidity iconRelative Humidity (%) -20 -19 -20 -15 +0 +8 +18 +26 +19 -2 -7 -15   -2.3
dewpoint temperature iconAverage Dew Point Temperature °C & (°F) -5.9 (-11) -5.6 (-10) -5.9 (-11) -5.3 (-10) -4.1 (-7) -2.4 (-4) -0.8 (-1) -0.1 (0) -3 (-5) -7 (-13) -6.5 (-12) -7 (-13) -4.5 (-8)

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