Now these prābhava-vilāsa forms, four-handed, They are also divided into different names according to the different months. Just like your calendar month is called January, February, March, April, May, June, and in India the calendar months are named as Vaiśākha, Jyaiṣṭha, Āṣāḍha, Śrāvaṇa, Bhādra, Āśvina, similarly, according to the Vaiṣṇava smṛti, there are the spiritual... These names, calendar months, they are according to the situation of the sun. Similarly, in the spiritual world the twelve months are named according to the different features of the Lord.
Jyaistha
Srimad-Bhagavatam
SB Cantos 10.14 to 12 (Translations Only)
SB 12.11.35, Translation:
Mitra as the sun-god, Atri as the sage, Pauruṣeya as the Rākṣasa, Takṣaka as the Nāga, Menakā as the Apsarā, Hāhā as the Gandharva and Rathasvana as the Yakṣa rule the month of Śukra.
Sri Caitanya-caritamrta
CC Madhya-lila
CC Madhya 1.260, Translation:
Thereafter Sanātana Gosvāmī met the Lord again, and the Lord tested him in scorching heat during the month of Jyaiṣṭha.
CC Madhya 20.200, Translation:
“In the month of Jyaiṣṭha, the predominating Deity is Trivikrama. In Āṣāḍha the Deity is Vāmana, in Śrāvaṇa the Deity is Śrīdhara, and in Bhādra the Deity is Hṛṣīkeśa.
CC Antya-lila
CC Antya 20.109, Translation:
The Fourth Chapter also tells how Sanātana Gosvāmī was tested in the sunshine of Jyaiṣṭha (May-June) and was then empowered and sent back to Vṛndāvana.
CC Antya 20.157, Translation:
In Vṛndāvana in the year 1537 Śakābda Era (A.D 1615), in the month of Jyaiṣṭha (May-June), on Sunday, the fifth day of the waning moon, this Caitanya-caritāmṛta has been completed.