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<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>SunScope FAQ - Frequently Asked Questions</title>
<meta name="description" content="Everything you want to know about SunScope - UTCI explained, how hot cars get in the sun, sunburn times, air quality, UV safety, pollen counts, home cooling, farming, and how to read the forecast table." />
<meta name="description" content="Everything you want to know about SunScope - UTCI explained, how hot cars get in the sun, sunburn times, air quality, UV safety, pollen counts, home cooling, organic growing, and how to read the forecast table." />
<meta name="robots" content="index, follow" />
<link rel="canonical" href="https://sunscope.net/faq.html" />
<meta property="og:title" content="SunScope FAQ - Frequently Asked Questions" />
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{"@type":"Question","name":"What is the difference between PM2.5 and PM10?","acceptedAnswer":{"@type":"Answer","text":"PM stands for particulate matter. PM10 covers particles up to 10 micrometres including dust, pollen, and mould spores. PM2.5 covers finer particles up to 2.5 micrometres from vehicle exhausts and wood burning. PM2.5 is more dangerous because particles penetrate deep into the lungs and enter the bloodstream. Both are included in the AQI shown in SunScope."}},
{"@type":"Question","name":"What does the pollen count mean for hay fever sufferers?","acceptedAnswer":{"@type":"Answer","text":"SunScope shows pollen in grains per cubic metre. Below 10 is Low - most people notice nothing. 10-30 is Moderate - mild symptoms for sensitive sufferers. 30-80 is High - most hay fever sufferers will have symptoms. Above 80 is Very High - symptoms likely even with antihistamines. Select your specific pollen type: grass, birch, alder, mugwort, olive, ragweed, or total. In the UK grass peaks June-August; birch and alder peak in spring. Pollen is often lower after rain and in the evenings."}},
{"@type":"Question","name":"What does visibility mean in the forecast?","acceptedAnswer":{"@type":"Answer","text":"Visibility is horizontal visibility in kilometres. Below 1 km is dense fog, dangerous for driving. 1-4 km is fog or thick mist. 4-10 km is hazy but manageable. Above 10 km is good visibility. Visibility drops in fog, heavy rain, snow, dust, and high-pollution events. It is sourced from the Copernicus CAMS forecast via Open-Meteo."}},
{"@type":"Question","name":"What does dew point mean and why does it matter?","acceptedAnswer":{"@type":"Answer","text":"The dew point is the temperature at which air becomes saturated and water starts to condense. When air temperature falls to the dew point, fog forms and surfaces become wet with dew or frost. For farmers this matters for spray timing - spraying near the dew point risks poor chemical performance. For caravanners a high dew point means wet awnings and condensation in the morning. A dew point above 18 degrees feels oppressively humid even if air temperature is not extreme."}},
{"@type":"Question","name":"What does dew point mean and why does it matter?","acceptedAnswer":{"@type":"Answer","text":"The dew point is the temperature at which air becomes saturated and water starts to condense. When air temperature falls to the dew point, fog forms and surfaces become wet with dew or frost. For organic growers this matters for spray timing - applying foliar feeds or treatments near the dew point risks poor uptake. For caravanners a high dew point means wet awnings and condensation in the morning. A dew point above 18 degrees feels oppressively humid even if air temperature is not extreme."}},
{"@type":"Question","name":"What is the difference between a ground frost and an air frost?","acceptedAnswer":{"@type":"Answer","text":"An air frost is when the official air temperature 1.2 metres above the ground falls below 0 degrees. A ground frost is when the temperature at the surface falls below 0 degrees - which can happen even when air temperature is 2 or 3 degrees, because the ground radiates heat upward on clear still nights and chills faster than the air. Ground frosts damage tender plants, ice windscreens, and make paths slippery. SunScope flags frost events in the weather event banners above the table."}},
{"@type":"Question","name":"When is it safe to spray crops or apply pesticides?","acceptedAnswer":{"@type":"Answer","text":"Safe spraying needs wind below 3 metres per second to prevent drift, low temperatures to minimise evaporation, no rain forecast for several hours, and temperature comfortably above the dew point. SunScope Farming profile shows wind speed and direction, air temperature, relative humidity, dew point, and precipitation all in one view."}},
{"@type":"Question","name":"When is it safe to spray crops or apply foliar feeds?","acceptedAnswer":{"@type":"Answer","text":"Safe spraying of organic foliar feeds, compost teas, or permitted copper and sulphur treatments needs wind below 3 metres per second to prevent drift onto neighbouring land, watercourses, or buffer zones, cooler temperatures to reduce evaporation and leaf scorch, no rain forecast for several hours so the product is not washed off, and a temperature comfortably above the dew point. Spraying in the evening also protects foraging bees and beneficial insects. SunScope Farming profile shows wind speed and direction, air temperature, relative humidity, dew point, and precipitation all in one view."}},
{"@type":"Question","name":"What soil temperature do seeds need to germinate?","acceptedAnswer":{"@type":"Answer","text":"Most vegetable seeds need soil above 7-10 degrees. Warm-season crops like courgettes and beans need 12-15 degrees or more. Cool-season crops like lettuce can germinate at 4-5 degrees. Sowing too early into cold soil leads to seeds rotting. SunScope shows surface soil temperature and 6 cm depth temperature - the root zone where germination happens. The 6 cm figure lags the surface by several hours and reflects what seeds are actually experiencing."}},
{"@type":"Question","name":"How can I tell if the ground is too wet for a motorhome or caravan?","acceptedAnswer":{"@type":"Answer","text":"SunScope soil moisture shows volumetric water content in cubic metres per cubic metre. Above 0.4 is saturated and a heavy vehicle will likely sink. 0.3-0.4 is borderline. Below 0.3 is usually firm enough. Below 0.2 is dry and solid. The Vehicle profile includes soil moisture by default for motorhome and caravan users checking pitch suitability before arrival."}},
{"@type":"Question","name":"Does SunScope show air quality and pollen forecasts?","acceptedAnswer":{"@type":"Answer","text":"Yes. Three air environment columns sit after Cloud cover in the table: Visibility (horizontal visibility in km), AQI (European Air Quality Index combining PM2.5, PM10, ozone, nitrogen dioxide, and sulphur dioxide), and Pollen (grains per cubic metre with a type picker for grass, birch, alder, mugwort, olive, ragweed, or total). All three are sourced from Copernicus CAMS via Open-Meteo. Toggle them using the column buttons above the table."}},
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<details class="faq-block">
<summary class="faq-q">What does dew point mean and why does it matter?</summary>
<p class="faq-a">The dew point is the temperature at which air becomes saturated with moisture and water starts to condense. When the outdoor air temperature falls to the dew point, fog forms and surfaces become wet with dew or frost.<br><br>For farmers this is critical - spraying crops when the temperature is near the dew point risks poor pesticide performance and possible leaf scorch. For caravanners a high dew point overnight means wet awnings and condensation in the morning. A dew point above 18 degrees feels oppressively humid even if the air temperature is not extreme, because sweat cannot evaporate efficiently.</p>
<p class="faq-a">The dew point is the temperature at which air becomes saturated with moisture and water starts to condense. When the outdoor air temperature falls to the dew point, fog forms and surfaces become wet with dew or frost.<br><br>For organic growers this is critical - applying foliar feeds or organic sprays when the temperature is near the dew point risks poor uptake and possible leaf scorch. For caravanners a high dew point overnight means wet awnings and condensation in the morning. A dew point above 18 degrees feels oppressively humid even if the air temperature is not extreme, because sweat cannot evaporate efficiently.</p>
</details>
<details class="faq-block">
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</details>
<details class="faq-block">
<summary class="faq-q">When is it safe to spray crops or apply pesticides?</summary>
<p class="faq-a">Safe spraying requires low wind speeds - typically below 3 metres per second - to prevent drift onto neighbouring land or water. Low temperatures minimise evaporation and chemical breakdown. You want no rain forecast for several hours to let the product settle and absorb. And the temperature should be comfortably above the dew point to avoid condensation interfering with coverage.<br><br>SunScope Farming profile shows wind speed and direction, air temperature, relative humidity, dew point, and precipitation all in one view - so you have every variable you need without switching between multiple apps.</p>
<summary class="faq-q">When is it safe to spray crops or apply foliar feeds?</summary>
<p class="faq-a">Whether you are applying an organic foliar feed, a compost tea, or a permitted copper or sulphur treatment, safe spraying requires low wind speeds - typically below 3 metres per second - to prevent drift onto neighbouring land, watercourses, or buffer zones, which matters for maintaining organic certification. Cooler temperatures reduce evaporation and the risk of leaf scorch, and spraying in the evening protects foraging bees and other beneficial insects. You want no rain forecast for several hours so the product is not washed off before it can work, and the temperature comfortably above the dew point to avoid condensation interfering with coverage.<br><br>SunScope Farming profile shows wind speed and direction, air temperature, relative humidity, dew point, and precipitation all in one view - so you have every variable you need without switching between multiple apps.</p>
</details>
<details class="faq-block">
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<details class="faq-block">
<summary class="faq-q">How accurate is SunScope?</summary>
<p class="faq-a">SunScope uses Open-Meteo forecast data sourced from ECMWF and national meteorological services - the same underlying models used by professional forecasters. The UTCI calculation follows the peer-reviewed Brode 2012 polynomial exactly.<br><br>The derived columns - vehicle temperature, indoor temperature, concrete surface - are physics-based estimates rather than measured values, and will vary based on local factors like building construction, shading, surface colour, and vegetation. Treat them as well-informed estimates rather than precise measurements. They are consistently closer to reality than ignoring these effects entirely.</p>
<p class="faq-a">SunScope uses Open-Meteo forecast data sourced from ECMWF and national meteorological services - the same underlying models used by professional forecasters. The UTCI calculation follows the peer-reviewed Bröde 2012 polynomial exactly.<br><br>The derived columns - vehicle temperature, indoor temperature, concrete surface - are physics-based estimates rather than measured values, and will vary based on local factors like building construction, shading, surface colour, and vegetation. Treat them as well-informed estimates rather than precise measurements. They are consistently closer to reality than ignoring these effects entirely.</p>
</details>
<details class="faq-block">
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<details class="faq-block">
<summary class="faq-q">What data sources does SunScope use?</summary>
<p class="faq-a">Forecast data comes from <a href="https://open-meteo.com/" target="_blank" rel="noopener noreferrer">Open-Meteo</a>, which aggregates ECMWF, GFS, and national meteorological service models. The UTCI calculation follows the <a href="https://utci.org/" target="_blank" rel="noopener noreferrer">Brode et al. 2012</a> polynomial. Air quality, visibility, and pollen data are sourced from the Open-Meteo Air Quality API, which draws on the Copernicus CAMS forecast. Geolocation search uses the Open-Meteo geocoding API.</p>
<p class="faq-a">Forecast data comes from <a href="https://open-meteo.com/" target="_blank" rel="noopener noreferrer">Open-Meteo</a>, which aggregates ECMWF, GFS, and national meteorological service models. The UTCI calculation follows the <a href="https://utci.org/" target="_blank" rel="noopener noreferrer">Bröde et al. 2012</a> polynomial. Air quality, visibility, and pollen data are sourced from the Open-Meteo Air Quality API, which draws on the Copernicus CAMS forecast. Geolocation search uses the Open-Meteo geocoding API.</p>
</details>
<details class="faq-block">