Solar Panel Angle by Latitude: Calculate Tilt Value

Latitude Reference

What Is Solar Panel Angle by Latitude?

Solar panel angle by latitude is a tilt estimate that uses latitude as the baseline fixed angle. Latitude measures north-south position, and solar panel angle measures the panel's tilt from horizontal.

Latitude is measured in degrees north or south of the equator. Solar panel angle is measured in degrees from horizontal. The latitude method connects those 2 measurements.

The planning rule is:

Fixed tilt = latitude
Summer tilt = latitude - 15 degrees
Winter tilt = latitude + 15 degrees

This rule is educational. The final installation also uses roof pitch, orientation, shade, racking limits, local weather, and installer review.

Latitude Reference

What Is the Full Latitude Tilt Table?

The full latitude table gives a fixed, summer, and winter panel angle for each latitude from 0 to 70 degrees. The same tilt magnitude applies north and south; hemisphere changes the facing direction.

All angles are measured from horizontal.

Latitude	Fixed Tilt	Summer Tilt	Winter Tilt
0 deg	0 deg	0 deg	15 deg
1 deg	1 deg	0 deg	16 deg
2 deg	2 deg	0 deg	17 deg
3 deg	3 deg	0 deg	18 deg
4 deg	4 deg	0 deg	19 deg
5 deg	5 deg	0 deg	20 deg
6 deg	6 deg	0 deg	21 deg
7 deg	7 deg	0 deg	22 deg
8 deg	8 deg	0 deg	23 deg
9 deg	9 deg	0 deg	24 deg
10 deg	10 deg	0 deg	25 deg
11 deg	11 deg	0 deg	26 deg
12 deg	12 deg	0 deg	27 deg
13 deg	13 deg	0 deg	28 deg
14 deg	14 deg	0 deg	29 deg
15 deg	15 deg	0 deg	30 deg
16 deg	16 deg	1 deg	31 deg
17 deg	17 deg	2 deg	32 deg
18 deg	18 deg	3 deg	33 deg
19 deg	19 deg	4 deg	34 deg
20 deg	20 deg	5 deg	35 deg
21 deg	21 deg	6 deg	36 deg
22 deg	22 deg	7 deg	37 deg
23 deg	23 deg	8 deg	38 deg
24 deg	24 deg	9 deg	39 deg
25 deg	25 deg	10 deg	40 deg
26 deg	26 deg	11 deg	41 deg
27 deg	27 deg	12 deg	42 deg
28 deg	28 deg	13 deg	43 deg
29 deg	29 deg	14 deg	44 deg
30 deg	30 deg	15 deg	45 deg
31 deg	31 deg	16 deg	46 deg
32 deg	32 deg	17 deg	47 deg
33 deg	33 deg	18 deg	48 deg
34 deg	34 deg	19 deg	49 deg
35 deg	35 deg	20 deg	50 deg
36 deg	36 deg	21 deg	51 deg
37 deg	37 deg	22 deg	52 deg
38 deg	38 deg	23 deg	53 deg
39 deg	39 deg	24 deg	54 deg
40 deg	40 deg	25 deg	55 deg
41 deg	41 deg	26 deg	56 deg
42 deg	42 deg	27 deg	57 deg
43 deg	43 deg	28 deg	58 deg
44 deg	44 deg	29 deg	59 deg
45 deg	45 deg	30 deg	60 deg
46 deg	46 deg	31 deg	61 deg
47 deg	47 deg	32 deg	62 deg
48 deg	48 deg	33 deg	63 deg
49 deg	49 deg	34 deg	64 deg
50 deg	50 deg	35 deg	65 deg
51 deg	51 deg	36 deg	66 deg
52 deg	52 deg	37 deg	67 deg
53 deg	53 deg	38 deg	68 deg
54 deg	54 deg	39 deg	69 deg
55 deg	55 deg	40 deg	70 deg
56 deg	56 deg	41 deg	71 deg
57 deg	57 deg	42 deg	72 deg
58 deg	58 deg	43 deg	73 deg
59 deg	59 deg	44 deg	74 deg
60 deg	60 deg	45 deg	75 deg
61 deg	61 deg	46 deg	76 deg
62 deg	62 deg	47 deg	77 deg
63 deg	63 deg	48 deg	78 deg
64 deg	64 deg	49 deg	79 deg
65 deg	65 deg	50 deg	80 deg
66 deg	66 deg	51 deg	81 deg
67 deg	67 deg	52 deg	82 deg
68 deg	68 deg	53 deg	83 deg
69 deg	69 deg	54 deg	84 deg
70 deg	70 deg	55 deg	85 deg

The summer column does not go below 0 degrees because a negative tilt would face the wrong side of horizontal. A low-latitude site often uses a very flat summer setting.

Latitude Reference

What Latitude Range Chart Helps Users Scan Faster?

A latitude range chart groups the full table into 10-degree bands. The range chart helps users scan regions quickly before using ZIP code, city, address, or exact latitude in the calculator.

Latitude Range	Location Examples	Annual Tilt	Winter Tilt	Summer Tilt	Main Azimuth
0-10 deg	Singapore, Nairobi, Quito	5 deg	20 deg	0 deg	180 deg north side / 0 deg south side
10-20 deg	Mumbai, Bangkok, Caracas	15 deg	30 deg	5 deg	180 deg / 0 deg
20-30 deg	Cairo, Houston, New Delhi	25 deg	40 deg	10 deg	180 deg / 0 deg
30-40 deg	Los Angeles, Tokyo, Madrid	35 deg	50 deg	20 deg	180 deg / 0 deg
40-50 deg	New York, London, Paris	45 deg	60 deg	30 deg	180 deg / 0 deg
50-60 deg	Stockholm, Moscow, Calgary	55 deg	70 deg	40 deg	180 deg / 0 deg
60-70 deg	Anchorage, Oslo, Fairbanks	65 deg	80 deg	50 deg	180 deg / 0 deg

The range chart is a reference chart. The full 1-degree table gives the tighter lookup.

Latitude Reference

How Does Hemisphere Change Latitude-Based Angle?

Hemisphere changes panel direction, not the absolute tilt value. Northern Hemisphere panels generally face true south. Southern Hemisphere panels generally face true north. Latitude still gives the tilt magnitude from horizontal.

Solar angle has 2 linked dimensions:

Tilt describes vertical angle from horizontal.
Azimuth describes compass direction from true north.

Latitude supplies tilt. Hemisphere supplies the preferred direction. A 34 degree north site and a 34 degree south site can use the same fixed tilt magnitude, but they face opposite equator-facing directions.

Use the Solar Orientation Calculator after the latitude calculation because orientation completes the solar geometry pair.

Latitude Reference

When Is Latitude Not Enough?

Latitude is incomplete when roof pitch, roof direction, shade, mount access, snow, wind load, or local code controls the usable panel angle. Latitude gives the mathematical baseline, not the installation approval.

The most common limits are:

Roof pitch fixes tilt for flush-mounted panels.
Roof azimuth changes the direction of the array.
Shade blocks direct sunlight.
Snow regions use minimum tilt for shedding and cleaning.
Wind-load design limits steep racking.
Monthly adjustment requires safe access.

According to DOE home solar planning guidance, solar planning uses solar resource, orientation, tilt, efficiency, shade, roof condition, and installer assessment. Latitude is one input in that workflow.

Latitude Reference

How Does Latitude Connect to ZIP Code and Monthly Angle?

Latitude connects ZIP-code lookup and monthly tilt. ZIP code finds the location. Location returns latitude. Latitude sets the fixed angle. Monthly tilt modifies that angle across the year.

Use this internal path:

Solar Panel Angle by ZIP Code for postal-code lookup.
Solar Panel Angle by Latitude for the calculation baseline.
Solar Panel Angle by Month for 12-month adjustment.
Solar Panel Tilt Angle Chart for reference tables.

The homepage calculator combines all 4 layers.

Latitude Reference

FAQs

Can latitude be used as solar panel angle?

Latitude can be used as the fixed planning angle. The final angle still depends on roof pitch, orientation, shade, racking hardware, weather, and installer review.

Is latitude tilt measured from horizontal or vertical?

Latitude tilt is measured from horizontal. A 34 degree latitude estimate means the panel tilts 34 degrees above a flat surface.

Why does winter tilt add 15 degrees?

Winter tilt adds 15 degrees because winter sun travels lower across the sky. A steeper panel faces the lower winter sun path more directly.

Why does summer tilt subtract 15 degrees?

Summer tilt subtracts 15 degrees because summer sun travels higher across the sky. A flatter panel faces the higher summer sun path more directly.

What is the highest latitude covered in the table?

The table covers 0 to 70 degrees because most solar installations fall inside that range. Higher-latitude sites require deeper snow, low-sun, and seasonal daylight review.

Latitude Reference

Source Notes

C002: DOE home solar planning guidance describes solar resource, orientation, tilt, efficiency, shade, roof condition, and installer assessment.
C003: NOAA Solar Calculator uses location, latitude, longitude, date, and time for solar-position outputs.
C004: NREL Solar Position Algorithm describes solar zenith, azimuth, and incidence angle calculations.
C005: Site methodology uses latitude as the fixed tilt baseline and plus/minus 15 degree seasonal adjustments.

Reviewed by

Maya Hart

Solar PV Design Specialist. Reviewed for solar angle methodology, location-based tilt logic, roof-planning limits, and educational-use boundaries.

Solar Angle Methodology ReviewSolar Resource ModelingPV Tilt and Orientation Review

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