Insect remains from Early Weichselian interstadial deposits in northernmost Sweden were studied. A total of 93 taxa were identified in samples from 17 sites. Beetle remains dominate the assemblages. The habitat preferences of the insects indicate that an open arctic tundra prevailed during the two different interstadials, Perapohjola and Thendo. This environment included aquatic, moist, and xeric habitats. Aquatic/hygrophilous taxa were more abundant in kettle hole sites than in other types of sites, which may suggest that these had more open water and fens were more frequent in their vincinity. Contemporary mean seasonal temperatures were reconstructed using the MCR method. Summer temperatures at least 5 degrees C lower than at present were estimated for both the interstadials. The winters of the younger interstadial, Tarendo, were slightly colder than the older interstadial, with mean January temperatures at least 10 degrees C lower than at present.