Aurora Borealis in Calne
United Kingdom · 51.44°, -2.01° · geomagnetic 53.6° · needs Kp 7
Tonight's aurora forecast for Calne
1%
Peak chance of a visible display tonight, from the same model the Revon app runs. Calne needs Kp 7 to see anything at all, and tonight the forecast peaks at Kp 4.9. Short of the threshold, which is what most nights look like here.
Get the full 30-night forecast in Revon
Updated 2026-09-08 10:36 UTC
Local aurora guide for Calne
Calne is located at 53.6° geomagnetic latitude. Auroras are typically visible at this latitude during periods of high geomagnetic activity, specifically when the Kp index reaches 7.
On average, there are approximately 2.7 nights per year when conditions are suitable for aurora viewing in this region. These opportunities are spread across the period from April 2, 2016, to March 30, 2026.
The months of September, August, and November are historically the best for aurora viewing in Calne.
During June and July, the region experiences periods without full darkness, which can impact aurora visibility.
Calne has a Bortle scale rating of 7, indicating significant light pollution. Areas with darker skies, such as Bortle 4 conditions, are located approximately 106 km to the south.
Darker skies with a Bortle 5 rating can be found about 18 km west-north-west of Calne, near Wiltshire.
Notable terrain features that may affect viewing include Avon Grove Hill to the north, Windmill Hill to the east, Friday Island to the north, Erlestoke Park to the south, and Alice Park to the west.
Avon Grove Hill is a hill located 7.3 km north of Calne.
Windmill Hill, a hill situated 9.0 km east of Calne, offers potential vantage points.
Friday Island is an island located 23.8 km north of Calne. Erlestoke Park, a park, is situated 17.6 km south of Calne. Alice Park, another park, is located 23.6 km west of Calne.
Between April 2, 2016, and March 30, 2026, there have been an average of 2.7 nights per year suitable for aurora viewing in the Calne area.
Historical records show verified sightings, with 60 reports logged within a 300 km radius between January 1, 2015, and December 31, 2016.
Specific qualifying nights with high geomagnetic activity (Kp 7.0 or higher) occurred on March 20, 2026; January 20, 2026; January 19, 2026; November 12, 2025; and November 11, 2025.
Sources: Revon analysis of NOAA planetary Kp · Solar declination and hour-angle calculation · Falchi 2016 World Atlas of artificial night sky brightness · GeoNames (CC BY 4.0) · Aurorasaurus verified positive reports
Know when it is worth going outside
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