If you are deciding whether to get examined this week, it helps to bring more than a memory of your worst day. A short weather log gives you something concrete to show the person examining you. It is not a test, and it cannot tell you what is causing your symptoms. It is a way to get your own observations onto paper while they are still clear.
What to note each day
Use one line per day. Write the date, whether you had a headache or any other symptom, and how long it lasted if you know. Then add what the weather was doing. Note whether it was raining, hot, humid, windy, cold, or changing quickly from one hour to the next. A plain phrase such as 'humid by noon' or 'storm after dinner' is enough. If you can check a forecast or a local weather record, write the high and low temperatures, but you do not need exact numbers to begin.
Also note what else was happening. Did you sleep less than usual? Skip a meal? Spend the afternoon outdoors? Did you travel or work a longer shift? Keep these notes brief. The goal is to see whether a pattern appears over time, not to settle on any one explanation before you have enough days recorded.
Why the day matters more than the hour
Weather changes often unfold over a day or two, and a headache may begin hours after the change you noticed. For that reason, a log organized by the day is easier to keep than one organized by the hour. If you can, write three short phrases for each day: the morning, the afternoon, and the evening. If a change happened overnight, add a note that says so, since a sudden shift while you slept is easy to forget by breakfast.
Keep the entries in the same order each day so they are easy to scan. A consistent format matters more than detail. Someone reading the log later should be able to find the date, the symptoms, and the weather in the same place every time.
Keeping the log useful
Write by hand in a notebook or type into a note on a device you already carry. Aim for two to four weeks if you can. A shorter log still helps, and you can start one today even if your visit is only a few days away. Bring the log with you, along with a list of any medicines or supplements you take, the doses, and when you last took each one. Medication use is easy to leave out when you are tired or stressed, and it matters to the person examining you.
If you miss a day, leave the line blank rather than guessing. Honest gaps are more useful than entries that have been filled in later to look neat. Mark the gap, then pick up the log the next morning.
What the log can and cannot show
A log may show that your headaches tend to come on humid days, or that they do not follow the weather at all. Either answer is useful information for a visit. It cannot tell you why a headache happened, and it cannot rule out other causes. Only an examination can do that. If a headache feels different from your usual pattern, or comes with weakness, confusion, trouble speaking, vision loss, or a sudden severe onset, do not wait to write it down. Seek help right away.
Bringing it to the visit
Read your log aloud the way you would tell it to a friend, starting with the most recent week. Point to any day that stands out, and say what you were doing and eating that day. If you are unsure about a date or a time, say so plainly. Uncertainty is normal, and the person examining you would rather hear it than receive a tidy story that is not quite accurate.
Keep the original log, and make a copy for your own records before you hand anything over. Your notes belong to you. If you want to continue the log after your visit, keep the same format so that new entries line up with the old ones, and add a line when anything changes in your treatment or routine.