The distribution of regional wind and temperature in the Toyama plains was clarified in this study. The four days that recorded the remarkable high temperature in 2004 were chosen. The numerical model was applied, and the regional distribution and the change were reproduced with 1km interval grid. The result was as follows. The different patterns of temperature distribution appeared by the different air currents that(1)detoured the Hida mountain range, (2)went through the Hietsu valley, (3)went over and down the Hietsu mountainous region, and (4)went over the Kaetsu border hills, respectively. That is, (1)the easterly wind, when typhoon was approaching, brought high temperature, but didn't exceed the Hida mountain range directly;(2) the southerly wind brought the regional strong wind and the high temperature where the Jinzu River flowedinto the Toyama plains;(3)when the southerly wind blew, the warm air accumulated inland was continually supplied and consequently Toyama city recorded a remarkable high temperature; (4)the southwesterly wind velocity was very high, and a remarkably warm area expanded to the Tonami plains from the Iouzen. The different wind directions by the change of synoptic scale atmosphere and the different scale-topographical featuresaccording to the change of the wind direction were due to these facts. That is, in Toyama Prefecture, the large-scale Hida mountain range influenced the east wind, the medium-scale Hietsu mountainous region influenced the south wind, and the small-scale Kaetsu border hills influenced the southwest wind. Moreover, on the seacoast of the northeastern part of Toyama Prefecture and along the coast of the Oyabe River in the northwestern part of Toyama Prefecture, the sea breeze blew in easily and the temperature rise was controlled.富山平野をはじめ日本海側の平野部には,春季を中心にして顕著な昇温現象が現れる。これはおよそ日本海を東進する低気圧に伴う,山越えの南風によって引き起こされるフェーン現象として,説明されることが多い。ただし,こうしたフェーン現象にしても,その出現は北陸の各地やまた富山平野内でも局地的な差異があり,春季と夏季でも異なるものである。 本論では,こうした暖候期の気候の局地的差異,とくに強風が富山平野に流入する際の,気候の局地的差異について,モデルによる再現実験を援用して,詳細に明らかにする。まず暖候期において,局地的な気候の季節による差異を再検討し,次に春季(5月)と夏季(8月)について,顕著な昇温が起きた事例を抽出する。次にこれらの事例にモデルをあてはめて再現実験を行い,昇温の出現過程の詳細を明らかにする。さらに,局地における気流と気温に関する研究事例と比較し,富山平野における局地気候の形成について,検討を加える。