Ключевые слова: 30, air, arctic, atmosphere, blue, celsius, climate, cold, concepts, cool, crystal, danger, december, degree, effect, equipment, fahrenheit, forecast, freeze, freezing, frosty, frozen, graph, growth, ice, indicator, january, low, measure, measurement, measuring, mercury, meteorology, meter, minus, number, scale, snow, snowflake, symbol, temperature, thermometer, tool, warming, weather, white, window, winter, winter landscape,