Possible Clues:

• Pattern of highs and lows
• Weather conditions cold near capital city, with extremes of temperature
• The atmosphere at 1:51, pal!
• 151 + 1000 + 8, say? That's the spirit
• Meteorological conditions
• Prevailing state
• Conditions affected mail etc
• Atmosphere around capital city cold and extremely tense
• Citrus tree almost devoured by cold weather
• It's hard to deny that it's changed