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The article discusses a study on the sky longwave radiation at Glaciar Zongo in Cordillera Real, Bolivia during the 1999-2000 hydrological year. The temperature and humidity of the atmosphere and the cloud cover are among the factors that influence the sky longwave radiation. The first examination of clear-sky longwave emissivity was conducted at hourly time-steps during daytime. Results showed high clear-sky shortwave transmissivity was due to high altitude and there was minimal variation in air temperature during cloudy periods. The possibility of simulating longwave irradiance at Glaciar Zongo as a function of near-surface air temperature and humidity and of atmospheric transmissivity for solar radiation is highlighted.