a first side portion having a first side wall and a first-side upper surface;

a second side portion having a second side wall and a second-side upper surface;

a base configured for resting upon a substantially horizontal furniture-support surface, the base including a seating surface extending laterally between the first and second side portions and being configured to accommodate at least one seated person thereon;

a backrest extending upwardly above the seating surface and laterally between the first and second side portions;

a self-supporting, substantially rigid weather-protective primary panel having opposed panel inner and outer surfaces that coextend along a panel plane between a primary-panel rearward-lower edge, a primary-panel forward-upper edge opposite the rearward-lower edge, and laterally opposed primary-panel first and second edges that extend between the primary-panel rearward-lower and forward-upper edges, wherein

(a) the primary-panel rearward-lower edge is retained for linear displacement behind the backrest between a lowermost position and an uppermost position;

(b) when the primary-panel rearward-lower edge is disposed in the uppermost position, the weather-protective primary panel can be pivoted about a panel-pivot axis between vertical and horizontal orientations relative to the furniture-support surface, the vertical orientation being such that the primary-panel forward-upper edge is disposed above the primary-panel rearward-lower edge and the horizontal orientation being such that the primary-panel forward-upper edge is disposed forwardly of the primary-panel rearward-lower edge; and

(c) by virtue of the aforesaid linear displaceability and pivotability, the weather-protective primary panel can be linearly and pivotably displaced between (i) a storage position in which the weather-protective primary panel is vertically disposed behind the backrest such that the panel plane is substantially perpendicular to the furniture-support surface with the primary-panel rearward-lower edge in its lowermost position and (ii) a deployed position in which the weather-protective primary panel is horizontally disposed above the seating surface such that the panel plane is substantially parallel to the furniture support surface.