The science behind Apiary Forecast

A normal weather forecast can tell you whether it will be warm, wet, windy or bright. What it usually cannot tell you is what that combination of conditions might mean for honey bees.

A day that feels pleasant to us might still be too cool, dull, windy or unsettled for useful foraging. Bees may be flying without bringing much home. Flowers can be open while offering little nectar. Conditions may allow brief activity while still being unsuitable for opening a hive.

Apiary Forecast bridges the gap between a weather forecast and a beekeeper’s judgement.

It combines local weather data with location, elevation, seasonal timing, recent rainfall, modelled soil conditions, local plant evidence and apiary context, then interprets that information through a beekeeping lens.

Members can go further by saving their own apiaries and colonies, bringing weather guidance together with colony records, inspections, feeding, stores, treatments, queens and practical priorities.

Local weather matters

Apiaries are affected by very local conditions.

A sheltered garden, coastal field, upland site and valley apiary can behave differently, even when they are only a few miles apart. Where shelter, elevation or coastal exposure changes quickly, the difference may be noticeable over an even shorter distance.

Apiary Forecast uses Open-Meteo weather data and works from the selected apiary or settlement location.

Members can save up to three private apiary locations, allowing guidance to be based more closely on where their bees are actually kept rather than relying only on a broad postcode area.

Elevation, coastal influence and apiary exposure are also taken into account. Higher or more exposed sites may be cooler, windier and later to develop than nearby sheltered ground.

The weather forecast supplies the environmental data. Apiary Forecast adds the beekeeping interpretation.

Different jobs need different forecasts

There is no single universal “good day for bees” score. And, as most beekeepers quickly discover, there is rarely one simple answer.

A day that supports flying is not automatically suitable for an inspection. Weather that allows bees to forage may not be warm or settled enough for opening a colony. Swarm movement and queen mating depend on different combinations of conditions again.

That is why Apiary Forecast uses separate tools for separate practical questions.

Swarm Outlook considers whether the weather may support swarm movement when a colony is already preparing to swarm.

Inspection Outlook considers whether conditions are suitable for opening or checking a colony and helps identify the more useful inspection windows during the day.

Forage Outlook considers pollen and nectar potential, whether bees are likely to be able to collect them, likely nectar support and possible pressure on colony stores.

Queen Mating Outlook helps members assess whether weather conditions are likely to support mating flights during queen development.

Apiary Trends gives members a longer view of how conditions around a saved apiary have been developing rather than looking only at today.

The same day can therefore produce very different answers depending on the job you are planning.

Hives Today brings it together

Weather is only part of a beekeeper’s decision.

For members who record their colonies, Hives Today combines current apiary conditions with practical colony information.

It can bring together inspection opportunities, colony priorities, future tasks and stores information so that you can see both what the weather is doing and which colonies may deserve attention.

It is designed as a practical starting point rather than another forecast page.

Apiary Forecast does not decide what must be done to a colony. It helps bring relevant information together so that you can decide what deserves a closer look.

Colony Management

Members can use Colony Management across up to three saved apiaries, with up to 30 active colonies in total.

Records can include inspections, feeding, treatments, queen information, colony changes and other important events.

Operations such as splits, artificial swarms, nuc expansion, uniting colonies and queen development can be recorded in the same system, helping preserve the history of how a colony developed rather than leaving that information scattered across notes.

Apiary Visit provides a more practical workflow when working through several colonies at the apiary, including support for preparing a visit for use when mobile signal is poor or unavailable.

The aim is not to replace a beekeeper’s own records or judgement. It is to connect those records more usefully with the environmental information Apiary Forecast already understands.

Forage Outlook looks beyond flowers

Flowers being present does not automatically mean forage is coming into the hive.

Some flowers are much more rewarding or attractive to bees than others. Research from the University of Sussex has shown that garden plants can vary enormously in the numbers of bees and other insects they attract.

Flowering also does not guarantee that nectar is being produced in useful quantities, or that bees can reach and collect it.

Forage Outlook therefore separates the problem into several different questions.

Pollen potential

Pollen potential estimates likely pollen support using local plant evidence, flowering timing and seasonal development.

Pollen may be present in the landscape while wind, rain, low temperatures or other conditions make it difficult for bees to collect.

Pollen collection outlook

Pollen collection outlook considers both the likely pollen opportunity and whether bees are likely to be able to reach and work those sources.

This helps distinguish pollen being present from pollen being practically available to the colony.

Nectar potential

Nectar potential considers the flowering sources expected to be available in the area and their likely ability to contribute useful nectar.

It is a view of the underlying forage opportunity rather than a claim about what bees will actually collect on a particular day.

Forecast nectar supply

Forecast nectar supply considers how strongly those expected forage sources may currently be supporting nectar.

It combines plant and seasonal evidence with factors such as recent rainfall and modelled soil conditions. This helps identify whether the surrounding forage is more likely to be offering dependable nectar support or whether that support may be reduced.

Nectar collection outlook

Nectar collection outlook considers both the available nectar support and whether bees are likely to be able to collect it under the forecast conditions.

Bees may be flying while achieving relatively little useful nectar intake. Conversely, a shorter favourable period may still allow worthwhile collection during an otherwise poor day.

Bee flying conditions

Bee flying conditions consider whether bees are likely to be able to leave the hive and work effectively.

Wind can reduce flower-visiting rates and make bees more hesitant to take off. Rain, low temperatures and poor light can also shorten or restrict useful flying periods.

Nectar conditions

Nectar conditions consider whether temperature, light and moisture are broadly supportive of nectar availability, alongside the effects of rain and wind on practical collection.

Different plants respond differently, so this is not a claim that every flower behaves in exactly the same way. It is a practical interpretation of whether the day looks broadly supportive.

Stores pressure

Poor intake can happen for different reasons.

Forage may be present, but wind, rain or low temperatures may prevent bees reaching it. That can create temporary pressure on colony stores even while flowers remain available.

At other times, nectar support itself may be weak because of a seasonal gap, prolonged dryness or fading forage sources. That may indicate a more genuine shortage.

Stores Pressure looks at this environmental side of the problem. It helps indicate when weather and forage conditions may be causing colonies to use more carbohydrate than they can readily replace.

That might prompt a beekeeper to heft a hive, check stores during the next suitable inspection or consider whether feeding may be necessary.

It does not claim to know how much food is actually inside a colony.

Colony Stores Position

Members who use Colony Management can optionally go a step further with Colony Stores Tracking.

The beekeeper provides the important starting point by recording a direct Stores observation such as Low, Medium or High.

Apiary Forecast can then use that observation together with subsequent environmental Stores Pressure, nectar conditions and recorded carbohydrate feeding to provide a continuing Stores Position between inspections.

The distinction is important:

Stores Pressure asks whether current environmental conditions are likely to be putting pressure on stores.

Stores Position asks how an individual colony’s last recorded stores observation may reasonably have changed since it was checked.

Apiary Forecast will not invent a stores baseline from the weather alone. If there is no recent direct observation, it will say so rather than pretending to know what is inside the hive.

The estimate also becomes less certain as time passes and conditions change, so it remains a prompt for beekeeper attention rather than a substitute for checking the colony.

Plant evidence

Forage Outlook uses a curated set of bee-relevant forage groups, including trees, shrubs, hedgerow plants, wildflowers, wetland-edge plants, heath, moorland and late-season sources.

Plant Atlas 2020, produced by the Botanical Society of Britain and Ireland, provides the main plant-distribution evidence used by the forage model.

It is based on more than 30 million botanical records and helps Apiary Forecast identify which wild and semi-wild forage groups have recorded support in the wider area around a selected location.

Plant Atlas records plants found growing in the wild. It does not provide a complete picture of crops or plants deliberately grown in gardens.

That is why crops, orchards, pollinator strips and substantial garden or allotment sources are handled separately through Managed Forage. Members can declare significant managed sources so that they supplement the local Plant Atlas evidence.

Other recognised sources have helped inform forage groups, flowering context and supporting reference material. These include the Royal Horticultural Society, Plantlife, the Woodland Trust, the Bumblebee Conservation Trust, the UK Centre for Ecology & Hydrology and Forest Research.

This takes Forage Outlook well beyond a simple flower calendar. It asks whether forage is likely to be present, seasonally relevant, accessible and useful under current conditions.

Local seasonal timing

The forage season does not develop at the same rate across the UK.

Phenology is the study of seasonal events such as flowering, leafing and fruiting, and how their timing changes with weather, climate and location.

A plant may begin flowering earlier in a mild coastal area than at a colder inland or upland site. Timing can also vary from one year to another.

Apiary Forecast uses established phenology principles to adjust expectations for local development. These include ideas associated with Hopkins’ bioclimatic law, which links changes in seasonal timing with latitude, longitude and elevation.

Hopkins’ rule is not treated as a perfect law capable of predicting every plant in every landscape. It provides useful context alongside location, elevation, coastal influence, exposure and recent environmental conditions.

This allows the same forage group to be treated as earlier, later or differently developed depending on where the apiary is located.

Rain, soil and nectar

Plants may continue flowering even when their nectar production has fallen.

Forage Outlook considers recent rainfall, time since meaningful rain, modelled shallow-soil moisture and soil temperature.

Recent dryness may reduce likely nectar support. Modelled soil moisture helps indicate whether a rainfall deficit may be affecting plants beyond what a single day’s rainfall total can reveal.

Research shows that drought can reduce nectar quantity or sugar reward in some plant species, although the strength of the effect varies between plants and habitats.

Soil temperature is considered separately as an indicator of whether plant development is being helped or slowed.

Air temperature, feels-like temperature, light, rain and wind are then used when considering the day’s nectar conditions and practical bee access.

Together, these provide a practical estimate of whether nectar support and collection opportunities look strong, reduced or unreliable.

Evidence-led beekeeping guidance

Apiary Forecast draws on:

• weather and elevation data;
• honey-bee foraging research;
• phenology and seasonal-development research;
• nectar and plant-reward studies;
• soil, rainfall and temperature evidence;
• UK plant and habitat records;
• beekeeper-recorded colony information;
• practical beekeeping experience.

It does not simply report the weather. It interprets how several conditions may work together and, where members choose to record colonies, connects that environmental picture with what is already known about their own bees.

The detailed scoring weights, thresholds and decision rules form part of the proprietary Apiary Forecast model.

Apiary Forecast gives you a better-informed second opinion. The decisions still stay with you.

Make better-informed decisions with Apiary Forecast.