Possible Clues:

• Lacking warmth
• Cool
• Lacking warmth or feeling
• Unfriendly country, we hear
• 'You'd be barmy to call it balmy in South America, by the sound of it (6)'
• Cold mountains so?
• Mildly cold
• See how mountainous and not so hot this part of the Americas sounds
• Not a warm part of the Americas, by the sound of it
• Freezing