An atomic outdoor wall clock can keep time in sync with the WWVB radio signal and add a useful temperature or humidity reading to a patio, porch, or other space. The best choice depends on where you plan to hang it: weather protection, dial size, and battery needs vary across these three models. Here’s how they compare and what to consider before choosing.
| Clock | Size | Standout features | Best suited for |
|---|---|---|---|
| La Crosse Technology 404-89027-INT | 18 inches | Atomic time updates, temperature and humidity gauges, up to five years of battery life | A sheltered outdoor space or indoor area where a classic finish fits |
| FOUNTAIN DESIGNS 20-Inch Atomic Wall Clock | 20 inches | Atomic time, automatic daylight saving time adjustment, temperature and humidity gauges | A covered patio or a large indoor wall |
| Aurowit Atomic Outdoor Wall Clock | 18 inches | Sealed waterproof design, atomic time, temperature display | A location where water protection and a large dial matter |
Table of Contents
Our Picks: Best Atomic Outdoor Wall Clock reviews
La Crosse Technology 404-89027-INT: Best for Long Battery Life
This 18-inch analog clock combines atomic time updates with built-in temperature and humidity gauges. It syncs with the WWVB radio transmission from Fort Collins, Colorado, so it can update its time automatically. Its soft linen-textured frame and dark bronze metallic finish give it a more decorative look than a plain utility clock.
La Crosse describes the case as weather-resistant and suitable for indoor or outdoor placement. That makes it a practical option for a porch or other outdoor spot, though the product information does not give it a specific waterproof rating. If it will be exposed to heavy rain, compare that limitation with the more explicit water-protection claims of the other models.
One notable convenience is its stated battery life: a set of three AA batteries can keep it running for up to five years. That estimate may appeal if you want to avoid frequent battery changes. The clock’s combination of time, temperature, and humidity readings also suits a household space where you want more than just the time at a glance.
Pros:
- Automatically syncs with the WWVB radio signal
- Displays both temperature and humidity
- Three AA batteries are rated to last up to five years
- Weather-resistant design and a distinctive bronze-finish frame
Cons:
- No specific waterproof rating is provided
- Its 18-inch size is smaller than the 20-inch Fountain Designs model
Verdict: Choose the La Crosse if long stated battery life, both weather readings, and a traditional finish matter more to you than a specific waterproof rating or the largest dial.
FOUNTAIN DESIGNS 20-Inch Clock: Best for a Covered Patio
At 20 inches across, this oil-rubbed bronze clock is the largest option here. It receives the WWVB radio signal for automatic time synchronization and includes automatic daylight saving time adjustment. Those features make it a strong fit if you want a prominent clock without routine manual time changes.
The built-in thermometer and hygrometer show temperature and humidity. The manufacturer describes the clock as weatherproof and notes protection against UV and water exposure, but recommends hanging it under a covered area. That guidance makes a sheltered patio or porch a more suitable location than a wall fully exposed to the elements. Its farmhouse-style finish may also work well indoors in a kitchen, entryway, or living room.
The product information says the temperature and humidity gauges can be calibrated and advises allowing three hours for adjustments before use. That added setup step is worth keeping in mind if you want the readings to be as useful as possible. Battery type and estimated battery life are not specified in the supplied details, so check the product information before buying if those points are important to you.
Pros:
- Largest dial in this comparison at 20 inches
- Automatically syncs time and adjusts for daylight saving time
- Measures both temperature and humidity
- Designed for indoor use or an outdoor area under cover
Cons:
- The manufacturer recommends a covered outdoor location
- Battery type and expected battery life are not stated in the supplied details
Verdict: Pick the Fountain Designs clock if you want the largest dial, automatic daylight saving time adjustment, and weather readings for a covered patio or a spacious indoor wall.
Aurowit Atomic Outdoor Wall Clock: Best for a Sealed Design
The Aurowit is an 18-inch atomic analog clock with a sealed design and a screw-on waterproof cover. It receives the WWVB signal to update the time and can adjust automatically for daylight saving time. Its large dial and bold numerals are intended to make the time easier to read from a distance.
Unlike the other two clocks in this comparison, the Aurowit’s listed weather reading is temperature only; the supplied details do not mention a humidity gauge. It uses a traditional temperature-sensing method with copper coils, which can respond slowly as conditions change. The manufacturer also notes that readings may vary and that manual temperature adjustment is supported. If precise, rapidly updated temperature readings are a priority, that is an important trade-off.
The clock requires one AA battery, which is not included. Its stated sealed waterproof construction may make it worth considering for a location where water protection is a key concern. The product information does not provide an IP rating, so it is best to review the manufacturer’s guidance for your intended installation spot.
Pros:
- Sealed design with a screw-on waterproof cover
- Automatically updates time from the WWVB signal and adjusts for daylight saving time
- Large 18-inch dial with bold numerals
- Uses one AA battery
Cons:
- Temperature response can be slow, and readings may vary
- One AA battery is required but not included
Verdict: Consider the Aurowit if a sealed water-resistant design and a clear, large dial are your priorities, and you can accept a temperature reading that may respond slowly or need adjustment.
How to Choose an Atomic Outdoor Wall Clock
Match the Weather Protection to the Location
Outdoor clocks do not all offer the same level of protection. The La Crosse is described as weather-resistant, the Fountain Designs model is recommended for a covered outdoor area, and the Aurowit has a sealed waterproof design with a screw-on cover. Think about whether your clock will sit under a roof or face direct rain and water exposure, then compare that with the manufacturer’s placement guidance. Do not assume that every outdoor-rated clock is suited to every outdoor location.
Choose a Dial Size You Can Read from Your Usual Spot
The Fountain Designs clock measures 20 inches across, while the La Crosse and Aurowit models measure 18 inches. A larger dial can be useful on a broad wall or when you want to check the time from farther away, but it also takes up more visual space. Measure the wall and consider how far away you will usually stand before choosing.
Decide Which Weather Readings You Need
All three clocks offer a temperature reading. The La Crosse and Fountain Designs models also include humidity gauges, while the Aurowit product details list temperature only. If humidity is useful for your patio, greenhouse, or indoor space, focus on a model that includes that gauge. The Aurowit’s temperature sensor may respond slowly, and its readings may vary, according to the product information.
Check Time and Daylight Saving Features
Each model uses the WWVB radio signal to update its time. The Fountain Designs and Aurowit descriptions also specify automatic daylight saving time adjustment. The La Crosse product details describe automatic time updates but do not specifically state that it adjusts for daylight saving time. If that feature is a must-have, confirm it in the product information before you buy.
Compare Battery Requirements
Battery details can affect both setup and upkeep. The La Crosse uses three AA batteries and has a stated battery life of up to five years. The Aurowit requires one AA battery, which is not included. Battery type and expected battery life are not provided in the supplied details for the Fountain Designs model, so check the listing or product manual if you want to plan ahead.
Consider Setup and Calibration
Radio-controlled clocks need to receive the WWVB signal to synchronize. Choose a location that lets you follow the manufacturer’s setup guidance, and allow time for the clock to make its adjustments. The Fountain Designs instructions call for three hours for gauge adjustments; the Aurowit supports manual temperature adjustment. If you rely on the weather readings, calibration guidance is worth reviewing before hanging the clock.
Frequently Asked Questions
What does “atomic” mean on an outdoor wall clock?
These clocks use a receiver to synchronize with the WWVB radio signal. The supplied product details say the La Crosse, Fountain Designs, and Aurowit models receive that signal to update their time.
Do all three clocks adjust automatically for daylight saving time?
The Fountain Designs and Aurowit descriptions specifically say they adjust automatically for daylight saving time. The La Crosse details describe automatic time updates but do not specifically mention daylight saving time adjustment.
Which clock has the largest dial?
The Fountain Designs clock has a 20-inch dial. The La Crosse and Aurowit models are both 18 inches.
Which models show humidity?
The La Crosse and Fountain Designs clocks include humidity gauges as well as temperature readings. The Aurowit product details list a temperature reading but do not mention a humidity gauge.
Can these clocks be left in direct rain?
The placement guidance differs. La Crosse describes its clock as weather-resistant, Fountain Designs recommends a covered area, and Aurowit describes a sealed waterproof design. Check each manufacturer’s guidance for your specific location, especially if the clock will face direct exposure.
Do the clocks include batteries?
The La Crosse description calls for three AA batteries but does not specify whether they are included. The Aurowit requires one AA battery and says it is not included. Battery details are not provided for the Fountain Designs model in the supplied product information.
Which clock is best if I want low battery upkeep?
The La Crosse has the clearest battery-life information: three AA batteries are stated to last up to five years. Battery life is not specified for the other two models, so compare their current product information if that is a deciding factor.
Final Recommendation
For a balance of automatic time updates, temperature and humidity readings, and a stated battery life of up to five years, the La Crosse Technology 404-89027-INT is the most practical all-around choice for many sheltered outdoor spaces. Choose the Fountain Designs model if you want a larger dial and automatic daylight saving time adjustment, or the Aurowit if its sealed design is your top priority. Before you buy, match the clock’s weather guidance and battery details to the exact place you plan to hang it.
