Why Keep a Nature Journal?

A nature journal is not a diary of feelings, though feelings will creep in. It is a simple record of what is happening outside your window, in your garden, or along the same footpath you walk each week. The point is repetition: by noting the same things at the same spots through the year, you build a personal calendar of local events. After two or three years, that calendar becomes genuinely useful. You will know when the oak in the churchyard usually leafs out, when the first swallows arrive over the reservoir, and how many days of frost your valley really gets.

You do not need expensive kit. A sturdy notebook that fits a coat pocket, a pencil, and a waterproof jacket will do. A pencil is better than a pen in cold weather and will not smudge in the rain. If you like a little more structure, add a cheap thermometer and a note of wind direction from the weather forecast.

What to Record Each Week

Keep your entries short and consistent. Ten minutes is plenty. Aim for a handful of observations rather than a full survey.

• Weather: temperature, cloud cover, wind direction, rainfall, whether there was a frost overnight.
• Trees: bud burst, first full leaf, leaf colour, leaf fall. Note one or two named trees rather than every tree you see.
• Birds: first song of the year, first swallow or chiffchaff, flocks gathering, feeders busy or quiet.
• Other life: frogspawn, bumblebees, butterflies, fungi, the first wasp at the window.
• Sensory notes: the smell of wet earth, the sound of a woodpecker, the light at four o'clock.

Write the date and time at the top of every entry, and say where you were. "Bottom of the lane, 7.40am" is more useful than "out walking". If you can, note the same tree each time. A single oak followed faithfully for a year will teach you more than a whole woodland glanced at once.

Spring: Watching for the First Signs

Spring is the season that rewards attention most. Start with hazel and elder, which flower before their leaves appear. Note when catkins open and when they release pollen. Then watch for the first green haze on hawthorn and the burst of buds on horse chestnut, whose sticky buds are easy to see from a bus window.

Bird records matter here. Chiffchaffs usually arrive in southern England in March, sand martins shortly after, and swallows and house martins by mid-April. Write down the date and place of the first one you hear or see. Do not worry if you are not certain of the song at first; note what you heard and check it later. Over the years, your own arrival dates become a small, local record of spring's timing.

Summer: Growth, Song and Long Light

High summer can feel uneventful after the drama of spring, so change what you watch. Record leaf size and canopy shade, the first ripe elderberries, and the hum of insects on a warm evening. Note when the dawn chorus falls quiet, usually in late June or early July, and when swifts begin screaming in parties before they leave.

Keep an eye on water. If you pass a pond or stream, note its level and clarity, and when it last rained properly. These small observations add up to a picture of a summer that is dry or wet, early or late. Photograph nothing if you prefer not to; a written description of colour and texture will serve you better when you reread it in January.

Autumn: Colour, Fruit and Departure

Autumn gives you the clearest markers of the year. Begin with the turning of the first tree to change colour, often field maple or horse chestnut, and record the date. Then note when each tree is at its best and when it is bare. Oak and beech hold their leaves late; ash drops early. These differences are worth writing down.

Record fruit and nuts too: acorns, conkers, haws, sloes, and whether it is a heavy or lean year. This is called a mast year, and it affects everything from mice to jays. Birdwatchers should note the last swallow and the last swift, and the arrival of redwings and fieldfares from Scandinavia. A hard frost and the first flock of winter thrushes on the same weekend is a fine entry to reread.

Winter: Quiet Records and Looking Back

Winter is for shorter entries and for reading your own notes. Note hard frosts, snow lying, days when the ground never thaws, and the first catkins appearing on hazel before Christmas. Watch the birds on feeders: which species dominate, and when they change. Note the shape of bare trees, which is the best time to learn to identify them.

At the end of the year, spend one wet afternoon going through your journal. Mark the dates of ten or twelve events, from first chiffchaff to first frost, and copy them into a single page. That page is your calendar. Keep it, and next year you will have something to compare against. After a few years you will notice patterns, and perhaps changes, that no published guide could tell you about your own patch.