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Table 2 Assessment standard of extreme low temperature climate in cold regions

From: Analysis methodology and assessment indices of vulnerability for asphalt pavement in cold regions

Assessment Index Micro Mild Moderate Severe Extreme
Extremely lowest temperature (°C) <− 25 − 25 ~ − 30 −30 ~ − 35 −35 ~ − 40 ≥ − 40
Low temperature duration (d) < 5 5 ~ 10 10 ~ 20 20 ~ 30 ≥30
Daily temperature difference (°C) < 12 12 ~ 16 16 ~ 20 20 ~ 24 ≥24