The Clouded Yellow, Colias croceus

An immigrant species, plentiful in some years, scarce in others. In August 2013 they were thinly scattered over a wide area.

Weather notes:
2011. July - early August very wet.
2012. April - mid July very wet. August to mid September dry.
2013. Winter wet, March and early April, very cold. The rest of the spring was mostly cold. July mostly very warm, Aug warm.
2014. Winter very wet, mild. Spring was early, colder in mid April. Summer to early August, warm without a drought.
2015. Winter normal, March, April - May mostly cold. Sallow flowers opened on March 28 - 29th. Summer, fairly normal.
2016. Winter normal. Sallow flowers opened on April 2 - 3rd. Spring mostly cool and breezy. For a few weeks in late spring there was heavy rainfall and saturated soil and vegetation. Late summer with hot, dry periods.
2017. Winter mildish, hardly any frost. Sallow flowers opened on March 14 - 15th. Warm spells in March. April mostly dry and chilly. First Creeping Thistle flowers open on June 13th, followed by about 7 days of heat wave. Early July was very warm, excellent for counting butterflies. Late summer, autumn normal.
2018. Winter normal with a few days of settled snow. Sallow flowers open on March 26th. March, April mostly cold and wet, May warm. June 11, Bramble flowers opening to greet first Large Skippers. Mid June to early August, very hot and dry. Autumn mostly dry.
2019. Winter normal. Hardly any frost. Sallow flowers seen on March 10th. Spring mostly cool apart from Easter heatwave. May 31, Bramble flowers starting to open. June 1, Buckthorn in full bloom. Dryish summer with some heatwaves.
2020. Mildish winter. Sallow flowers open March 10th. Spring mostly cool. Several warm days in early April and through May. May 28 Bramble flowers opening. Record dry May. June nectar sources mostly Buttercups in the unmown paths, and Brambles.
2021.Winter normal. Very wet, early spring then cold. Sallow flowers opened on March 23rd. Summer with a few hot spells and moderate rain.
2022. Winter, normal. Sallow flowers open on March 18th. Bramble flowers open May 28. Summer, mostly very dry with long hot spells.
2023. Winter normal, some frost. Feb very dry, March very wet. Sallow flowers open on March 21st. Cold wet spring followed by hottest May on record, warm June and wet July. Autumn, mild and wet.
2024. Winter mild and wet. Feb very wet. Sallow flowers open on March 13th.

Personal sightings:

4 August 2013. Canvey Wick. Essex and Cambs. group field trip. 4 Clouded Yellows were seen, mostly moving short distances and settling very briefly.
26 August 2013. RSPB Reserve, Otmore, Oxfordshire. 1 Clouded Yellow.
27 August 2013. Twywell Hills and Dales, Northants. 1 Clouded Yellow.
8 June, 27 Aug and 28 Sept 2014. Roseland House paddock. 1 Clouded Yellow each time.
5 Aug 2014. Belchamp Walter, Essex. Bridleway from Crow's Farm. 1 Clouded Yellow.
7 Aug 2014. Stambourne, Essex. Footpath near the Birdbrook Road. 1 Clouded Yellow.