Sunshine, as with many South Atlantic Islands, is low, at a maximum of just 21.5%. This amounts to around 1,000 hours of sunshine annually. The local topography, however, also contributes significantly to the low insolation. A study published during the early 1960s indicated that sunshine recording instruments remained significantly obscured throughout the year and entirely obscured during June. It was estimated that the theoretical sunshine exposure minus obstructions would be around 14% at Bird Island and 35% at King Edward Pointor, in hourly terms, ranging from around 650 hours in the west to 1,500 hours in the east. This illustrates the effect the Allardyce Range has in breaking up cloud cover.
sunshinE, as wIth manY soUth AtlaNtIc islAnds, is loW, at A MaximUm Of JusT 21.5%. tHis amoUnTS TO arOUnD 1,000 hOUrs of sunShInE aNnually. the lOcal topogRaphY, howeVer, alSo Contributes sigNificaNtlY to tHe low InsOlatioN. a StuDy publIsHEd durIng ThE earlY 1960s indiCaTed ThAT sUnShine recordIng InSTrumEnts ReMaINed significanTLY ObScuRED throUGhOuT tHe year aNd entirely obscUred during junE. it was estImated THat THe THeORetical sUnshIne ExpOsUrE minus obsTRuctioNs WoULd Be aROunD 14% at birD isLaNd and 35% At king edwARD pOIntOr, iN hourLy TerMs, rAnGIng FRoM around 650 hOurs IN thE wEst to 1,500 hours In the EASt. thiS illustRates The effecT the AlLardyCe RAnge hAs IN bReAKinG up ClouD cover.