Weatherstation / Outdoor Sensor Housing

A naturally aspirated, louvred radiation shield for a small outdoor temperature/humidity sensor. It borrows the angled-louvre geometry of a Stevenson screen and adapts it to what an FDM printer can actually produce.

I designed this for my LIDL bought Auriol Weather-Station. A lot of other sensors will fit. I provide the .step files directly, so you can fit yours if necessary.

Five conical louvres slope down and outward, there is no straight-line path from outside the shield into the sensor column for any ray arriving from above the horizon.

The mounting plate itself acts as an additional shield, in my case for the southern facing side not covered by the post i mounted it on.

Sensor envelope: 26.9 × 43.1 mm. About 110mm height. The column is Ø72. I end-fitted mine with a bit of knead.

Note on limitations: this is not a WMO-compliant Stevenson screen. It has a single louvre row rather than double, a single roof, and a solid floor. Ground-reflected radiation arriving from below at shallow angles is not fully blocked. For relative humidity and dew-point work — deciding when to ventilate a room — that is irrelevant, because heating a parcel of air shifts temperature and RH in opposite directions and the dew point comes out right anyway.

Hardware

3 × M3 socket head cap screw, DIN 912, 12–16 mm — roof to body

3 × M3 square nut, DIN 562 (5.5 × 5.5 × 1.8) — captive in the body's top bosses

1 × M3 screw, 16–25 mm — dovetail anti-lift lock, self-tapping into the printed rail

2 × countersunk fastening screw, hole Ø5, depending on your need