Below is a table that highlights a selection of dialectal features. Note that everything doesn't necessarily fit perfectly, as exceptions and enclaves may occur.
The table is partly based on Pettersson, Gertrud (1996) Svenska språket under sjuhundra år.
The English names are accompanied by a 'native' name in parentheses.
ei = øy
ei = au
Remain Remain Monophthong. in the south Remain in the north Monophthong. in the east Monophthong. Remain Monophthong. Monophthong. Monophthong. Monophthong. Monophthong. Remain p, t, k → b, d, g No No In the south No No No To the far southeast (Bohuslän) No No No Only along the west coast Yes, except in the east Yes Yes No Final -a Remains Remains -e to the far north and southeast Apocope in the south. In the north both -e and -e/-a. Level stress1 and apocope Level stress Level stress Level stress Level stress Remains, -e to the far east -e in the north and the east Remains -e Apocope -e Loss of plural -r No No In the north and southwest Yes Yes Yes, except to the far south No No No No Yes, except in Värmland Yes Yes Yes No Allophone of /r/ Front Front Back in the south, as well as along the southern west coast with younger people Front Front Front Front Front Front Front Back in the south, the Geatish rule2 in the largest part of the rest of the area Back Back Back Front Lenition of g, k, sk No Initially and medially Initially and medially Initially and medially Initially and medially Initially and medially Initially Medially and partially initially Initially and medially. Unlenited in central Nyland as well as Estland. Initially, medially in the north Initially Initially Initially in the south Initially in the far north and south No Loss of -n No No Yes Yes Yes Yes Yes Yes In nothern Österbotten as well as in Estonia Yes, except in Uppland and Åland Yes No No No Yes Loss of -t No Yes Yes Yes Yes Yes Yes Yes, except in Upper Siljan Yes Yes No, except in Öland and Värmland No No No Yes Thick l No No No No, except in the far south Yes, in the southwest not from rð Yes Yes Yes, in Upper Siljan not from rð Not in Nyland, in Estonia not from rð Yes Yes, except to the far south No No No No Postalveolars No No No Yes Yes Yes Yes Yes Yes, except in Nyland Yes Yes, except in the south No No No No Breaking in 1p.sing.nom3 No No No No In the east (Jämtland, Härjedalen) Yes Yes No Yes Yes Yes Yes Yes No Yes Pitch accent No No Yes Yes Yes Yes Yes Yes No, except in western Nyland and western Åboland Yes Yes Yes, except in Bornholm. Traces of pitch accent in the west, no pitch accent in the south, otherwise replaced with stød. Replaced with stød. Traces of pitch accent to the far southeast. Yes Dative Yes Yes In the north No Yes In the north In the north Yes No No No No No No No
Explanation of some terms: