Keeping a nature journal for seasonal sightings

Start with a notebook that fits a coat pocket

A nature journal works best when it is small, cheap and always with you. An A5 hardback with a ribbon marker and a waterproof cover will survive a winter pocket; a softback sketchbook with a plastic wallet is just as good. Take a pencil rather than a pen — it writes in drizzle, upside down, and with gloves on — and add a small torch for dusk entries. Keep it by the back door next to your boots and binoculars, so it comes out with the dog lead as naturally as your keys.

The trick is to write in the field, not from memory at the kitchen table. Memory tidies things up: it rounds a flock of 23 chaffinches down to "about twenty" and forgets whether the song came from a hedge or a treetop. Ten minutes scribbled on a bench beats an hour of good intentions.

The four essentials of every entry

Every record, however short, needs four things. Without them, a page of sightings becomes a list of names rather than a piece of evidence.

• Date and time — fully written: "Sat 14 March, 7.40–8.15am". Note the daylight: an entry at first light tells a different story from one at noon.
• Weather — temperature, wind direction and strength, and cloud cover. "SW 3, 8/8 cloud, 6°C, after overnight rain" takes fifteen seconds and explains a great deal. Add frost, mist, or a hard overnight frost that has iced the bird bath.
• Location — be precise enough to find the spot again next year. "Garden, south-facing feeder" or "canal towpath, 200m past the second lock" is far more useful than "local patch".
• Species and behaviour — what the bird or animal was doing, not just that it existed. Singing from the top of the hawthorn. Carrying nest material. Squabbling over suet. Hovering over the lawn.

Counting so the numbers mean something

Counts are what turn a journal into a record of change, but only if you count the same way each time. Pick a fixed route — a twenty-minute loop round the garden and the lane, say — and walk it in the same direction at roughly the same hour. Write down the number you actually see, not the number you expect.

A few habits keep your figures honest:

• Count birds seen and heard separately; a singing wren you never clap eyes on still counts.
• Record flock sizes as a range when the birds are moving: "c.40 redwing, in three loose groups".
• Skip the count entirely in heavy rain or a stiff gale, and say so. Comparable conditions matter more than a perfect record.
• Note absences. "No swifts over the village after 12 August" is genuine data, and often the most interesting line on the page.

Simple sketches and the details memory loses

Nobody needs to be an artist. A thirty-second line drawing — the angle of a tail, the shape of a beak, the way a dunnock shuffles along the hedge base — fixes a bird in your mind far better than a tick in a box. Annotate with arrows: "pale supercilium", "tail flicked constantly", "legs pinkish".

Sketches also capture things words miss. Draw the bud burst on the ash, the first blackthorn blossom, a sloe turning from green to blue-black, a fox track in the frost. Add a quick note of scale — "leaf roughly thumbnail-sized" — and next spring you will know exactly how far ahead or behind the season is running.

Firsts and lasts: reading your own year

Keep a single page at the back of the notebook for firsts and lasts. Each year, add dates as they come: first chiffchaff singing, first swift screaming over the rooftops, first redwing in the hawthorn, first frog spawn in the pond, first peacock butterfly on the buddleia, first bramble ripe enough to eat.

After two or three years you will have something quietly powerful: your own phenology, drawn from your own patch. You will see whether the swifts are arriving earlier, whether the siskins only turn up in the coldest snaps, whether the blackbirds switch to ivy berries the week the ground freezes. Compare a wet, mild January with a sharp, frosty one and the patterns in feeding behaviour jump off the page.

A routine that survives wet Tuesdays

Keep it short and repeatable. A five-minute entry daily — date, weather, three species, one behaviour — beats a heroic Sunday session every six weeks. Dictate notes into your phone when your hands are too cold to write, then transfer them the same evening while the detail is fresh.

Once a month, read back through the pages and write a short summary: what changed, what arrived, what left. Once a year, in December, settle down with a mug of tea, add up your counts, and mark the firsts and lasts onto a single sheet. That sheet is the whole point — a small, personal, hard-won picture of how your corner of the countryside is shifting, one wet walk at a time.