About DayWatcher

With today's high costs, the key to staying profitable is having the most efficient routes, and making the largest drops with the fewest number of deliveries possible. To maximize profits, you need the most accurate degree-day readings you can get. With DayWatcher from Johnson Degree Day, you can computerize degree-day logging to boost profit from fuel delivery. The DayWatcher makes iffy high/low degree-day calculations obsolete by watching degree days for you, so you can keep your eye on the real prize: more gallons per drop, for more money in the bank.

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What's Included

The DayWatcher Degree Day logging System comes
with everything you need to get started.

The DayWatcher Inside Unit
AC Adapter
Three AA Batteries
Radiation Shield with Electronics Module


Eliminates Daily Posting

Just install the sensor, and our meter will do the rest. The DayWatcher will record highly accurate temperature data and automatically compile daily, monthly and seasonal totals. It works around the clock every day, including weekends and holidays. No more calculations on Mondays and after holidays.

Increased Profits

Get the degree-day data you need to convert will-calls to automatic fills, eliminate run-outs and increase your profits. Learn how the DayWatcher can save you over $7,000 a year.

No More Guessing

The DayWatcher system makes inaccurate high/low degree-day calculations obsolete - a thing of the past. By using over 2,800 datapoints per day, you can be confident in the precision of your data.

Pays for Itself in Weeks

With the money you will save, you’ll pay off the cost of the DayWatcher in no time. A quick payback means you’ll be boosting profits from every fuel delivery in a matter of weeks.

High-Low Method vs. Our Method

The High-Low Method

The High-Low is an average of the daily high-low temperatures. Most web-based calculators use this method and has large amounts of error. Here is a math example to prove it:
(80.1° + 52°) / 2 = 66.05°
65° – 66.05° = -1.05
Heating Degree Days – 0.00

But is this really an accurate way to measure degree days?

Johnson Degree Day’s Method

Our method collects thousands of data points each day to graph the temperature and calculate the exact degree day in your area. The DayWatcher is a local weather station unlike the NWS which could be miles away in different weather patterns than your customers.

Using the same information as the example above, we have expanded the data to show the temperature hour-by-hour (as indicated by the blue line). The grey line indicates the baseline of 65° (as was also used in the High-Low method).

The shaded area is used to calculate the actual degree days. As you can see, it’s quite different than what the High-Low method calculated:

Heating Degree Days – 3.89

How the High-Low method costs you money

Even though the difference between the High-Low and Johnson Degree Day methods is only a few degree days in a 24-hour period, think about how that small error can build up over time.

A small difference can build to a very large one in a matter of a week, a month, a season and especially a year.
Without an accurate picture of what’s really happening, you could be throwing away thousands of dollars in a year. The potential savings from using the DayWatcher could pay for its cost in a matter of weeks.