Weather information along roads is needed to reduce the traffic accidents caused by adverse weather and road conditions. Although automatic weather systems (AWS) provide wide-range coverage of weather conditions, collection devices cannot be installed on every road because of the high cost. Thus, we propose a method that extracts weather information using CCTV video data. This method is composed of three processing steps: generating conditional weather patterns using CCTV video data, calculating the similarity, and generating the weather information.