The cumulative number of degree-days below 0˚C, calculated by taking the average of the seasonal freezing indices for the three coldest winters in the most recent 30 years of record
The cumulative number of degree-days above 0˚C, calculated by taking the average of the seasonal thawing indices for the three warmest summers in the most recent 30 years of record
The cumulative number of degree-days above 0 degrees Celsius, calculated by taking the average of the seasonal thawing indices for the three warmest summers in the most recent 30 years of record.
A solution to Einstein's field equations of general relativity which contains no ordinary matter (Ω_M = 0) or radiation (Ω_R = 0), is Euclidean (k = 0), but has a cosmological constant (Ω_Λ > 0). The
Universe expands exponentially forever. This solution was the first model expanding of expanding Universe.