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The aim of this study was to determine associations between weather and playground surface conditions and time spent outdoors and in moderate-to-vigorous PA (MVPA) in preschool children aged 3–6 years. We included 1201 children (mean age 4.8 years, 51% boys) from 68 preschools in Norway who provided 12,030 days of observation during 2015–2016. Preschool MVPA was measured by accelerometry (ActiGraph GT3X+) for 10 consecutive weekdays. During this period, outdoor time and playground surface conditions were logged by staff and weather conditions were obtained from the Norwegian Meteorological Institute. Associations were determined using linear mixed models. Associations for MVPA depended on whether the analyses were adjusted for outdoor time or not. In unadjusted analyses, rainfall, wind, and wet, icy, and mixed playground conditions were negatively associated with MVPA, while temperature, snowfall, and dry playground conditions were positively associated with MVPA. In adjusted analyses, temperature and wet and mixed playground conditions were negatively associated with MVPA, while snowfall and dry and snowy playground conditions were positively associated with MVPA. Outdoor time and MVPA should be addressed simultaneously to inform interpretation of associations with weather characteristics and intervention development in early childhood education settings.

The role of weather conditions on time spent outdoors and in moderate-to-vigorous physical activity among Norwegian preschoolers