37 degree 6'
90 degrees north
The northernmost latitude on Earth is 90 degrees north, also known as the North Pole.
The maximum degree of latitude, north or south, are both 90 degrees.
The most northern latitude is 90 degrees north, at the north pole. The most southern latitude is 90 degrees south, at the south pole.
The Northernmost boundary of India is disputed and so an exact answer is not possible. However, the latitude at 22 degrees North would pass through the halfway point along the North-South axis.
37 degree 6 minutes north
The northernmost part of Texas is along the latitude 36.49°N - one city in that part is Booker, TX. The southernmost part of Texas is along 25.85°N where the Lower Rio Grande Vally National Wildlife Refuge is located.
The northernmost latitude on earth is 90 degreesnorth, at the north Pole.(The southernmost latitude on earth is 90 degreessouth, at the south Pole.)
The North Pole is at 90 degrees N latitude and is the northernmost place on earth.
India
The international boundaries are not stable in the extreme north, in the region of the Karakoram moutains. My mapping software is about 5 years old. It shows the northernmost point of India at 35.49° north latitude, but a small adjacent area disputed with China that would extend to 35.96° north latitude. (That's a difference of about 32 miles in the north/south direction.) A popular website shows much more of this region as disputed, among Pakistan, India, and China.
20 degrees north 77 degrees east