It is between 70 and 80 degrees Fahrenheit.
According to Table 4, the maximum pavement design temperature increases with the increase in FT-Paraffin content. This trend improves the bitumen performance at high temperatures. Figure 6 is the graph of tan for temperature range 42°C–82°C at the constant frequency of 1.59 Hz. On the other hand, bitumen with low penetration grade or hard bitumen has less low temperature cracking but more rutting resistance [ 1, 2 ]. This alteration can be related to the complex rheological behavior of bitumen at different loading times and temperatures [ 3, 4 ]. Asphalt (Composition) Shingles: The ideal temperature range to install asphalt shingles is between 70 and 80 degrees Fahrenheit. Colder than 70 degrees and the adhesive will not reach the ideal elasticity and will not create a perfect seal.  The temperature range at which asphalt will soften is determined for U.S. purposes by ASTM D-36. The three types of (air blown) asphalt used in roofing shingles soften at ranges from 140° F to 205° F depending on the grade. Comparison of asphalt shingle manufacturing temperatures vs. on-roof exposure temperatures. 1  ASPHALT SHINGLE TEMPERATURES-CONTENTS: what is the range of temperatures to which asphalt roofing products are exposed during manufacture and during service on roofs. 1 ASPHALT SHINGLE TEMPERATURES-CONTENTS: what is the range of temperatures to which asphalt roofing products are exposed during manufacture and during service on roofs. Comparison of asphalt shingle manufacturing temperatures vs. on-roof exposure temperatures. 1  As discussed earlier, FT-Paraffin is added to the base bitumen in amounts of 1, 2, 2.5, 3, and 4 weight percent of base bitumen at 130°C. At this temperature, the mixture is stirred for 20 minutes with a frequency of 300 rpm using high shear Silverson model mixer. On the other hand, bitumen with low penetration grade or hard bitumen has less low temperature cracking but more rutting resistance [ 1, 2 ]. This alteration can be related to the complex rheological behavior of bitumen at different loading times and temperatures [ 3, 4 ]. In pavement design, low temperature is the temperature at which the PAV aged bitumen beam has creep stiffness of 300 MPa minus 10°C, 60 seconds after loading by bending beam rheometer apparatus. The-value of the bitumen beam is more than 0.3 at the time of loading. On the other hand, bitumen with low penetration grade or hard bitumen has less low temperature cracking but more rutting resistance [ 1, 2 ]. This alteration can be related to the complex rheological behavior of bitumen at different loading times and temperatures [ 3, 4 ]. 2.3.1 Equiviscous Temperature (EVT) 1. Equiviscous application temperature should be used to achieve proper interply quantities of hot-applied asphalt in the construction of built-up roof membranes.2.The recommended asphalt EVT range for asphalt should be based on a viscosity of 75 centipoise,plus or minus 25 F.3.  Table 4 shows the effects of FT-Paraffin content on the high service temperature. The high service temperature is a temperature at which the will be larger than 1 kPa (kPa) for unaged bitumen and larger than 2.2 kPa (kPa) for RTFO aged bitumen (ASTM D2872). On the other hand, bitumen with low penetration grade or hard bitumen has less low temperature cracking but more rutting resistance [ 1, 2 ]. This alteration can be related to the complex rheological behavior of bitumen at different loading times and temperatures [ 3, 4 ]. A.3 R&BT TEMPERATURE. The softening point of asphalt binder as measured by AASHTO T53-08 is also known as R&BT. According to literature on the topic, this temperature, measured in Fahrenheit, corresponds to the temperature at which asphalt binder has a viscosity of 13,000 P (1,300 Pas). In this test, a 3.5-oz (100-g) needle is used to penetrate an asphalt sample for 5 s. The amount of penetration, measured in tenths of a millimeter, is the penetration number for the asphalt binder at the particular test temperature.
http://www.hindawi.com/journals/amse/2012/406791/ http://proroofingwisconsin.com/cold-weather-roofing.html http://inspectapedia.com/roof/Asphalt_Shingle_Temperatures.php http://inspectapedia.com/roof/Asphalt_Shingle_Temperatures.php http://www.hindawi.com/journals/amse/2012/406791/ http://www.hindawi.com/journals/amse/2012/406791/ http://www.owenscorning.com/NetworkShare/Asphalt/temp_and_viscosity.pdf http://www.hindawi.com/journals/amse/2012/406791/ http://www.fhwa.dot.gov/publications/research/infrastructure/pavements/ltpp/10035/008.cfm
bitumen temperature range