Sizes:

Average High and Low Temperatures Humidity Comfort Levels
By dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable
Average Monthly Rainfall Daily Chance of Precipitation to the Dollar
Medellín 4900'
has a tropical rainforest climate with no dry season. Typically 62°F - 78°F
Rarely <58°F | >81°F
Source
Armenia 4860'
climate is warm and overcast.
Typically 61°F - 79°F
Rarely <57°F | >83°F
Pereira 4630'
climate is warm and overcast.
Typically 61°F - 78°F
Rarely <58°F | >82°F
Cuenca 8400'
has a mild humid temperate climate with warm summers & no dry season.
Typically 44°F - 63°F
Rarely <40°F | >67°F
The Ecuador dollar is
pegged to the US dollar
Arequipa 7600'
has a cold desert climate.
Typically 48°F - 73°F
Rarely <44°F | >76°F
Jinotega 3000'
Typically 56°F - 84°F
Rarely <53°F | >88°F
Esteli 2770'
Typically 61°F - 88°F
Rarely <56°F | >91°F
Matagalpa 2300'
Typically 60°F - 87°F
Rarely <56°F | >91°F
Chiang Mai 1280'
The wet season is oppressive and overcast, the dry season is mostly clear, and it is hot year round.
Typically °59F - 97°F
Rarely <53°F | >102°F
Src

Chiang Rai 1020'
The wet season is oppressive and overcast, the dry season is mostly clear, and it is hot year round.
Typically °56F - 94°F
Rarely <50°F | >100°F
Src

Manta 0'
has a tropical climate with dry summers.
Typically 70°F - 83°F
Rarely <68°F | >86°F
The Ecuador dollar is
pegged to the US dollar
Leon 280'
Typically 72°F - 94°F
Rarely <68°F | >97°F
David -20'
has a tropical savannah climate with dry winters.
Typically 76°F - 93°F
Rarely <74°F | >95°F
The Panama dollar is
pegged to the US dollar
George Town 46'
is hot, oppressive, and overcast.
Typically °75F - 89°F
Rarely <72°F | >92°F
Src

Kuala Lumpur 217'
is hot, oppressive, and overcast.
Typically 73°F - 91°F
Rarely <70°F | >94°F
Src

The weather plots are from https://weatherspark.com/.
The currency plots are from http://www.xe.com/.
Cost of Living:

Source
Peru
The Rentista Visa is good for life and does not need to be renewed annually. There is only a small step each year that needs to be completed to basically prove that you are still in the country.
Expats with Rentista Visas do not need to pay the annual tax that is required from other foreigners. As well, they are exonerated from paying any Peruvian Income Tax on their pension money. And personal and domestic items can be imported into the country duty and tax free. Source
This is a permanent visa to reside in the country and holds no expiry date however you will not be able to work on it. You are also permitted to import any personal items (including furniture) into Peru without having to pay tax on them. Please note this does not include a car, if you wish to import your car to Peru you will be liable for the usual taxes and duties.
 
On this visa you do not need to renew your carne de extranjeria (residence permit) every year and do not need to pay foreign tax. Source
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Taxes  No breaks for expats. All residents must pay an income tax of 15% up to 50,000 soles (about $17,000) earned anywhere in the world and 30% for income over that amount. Source
All residents are taxed on income that they earn worldwide, while non-residents are taxed only on Peruvian earned income. For the purposes of taxation a resident is a Peruvian national or a foreign national that has spent more than 183 days a year in the country. Source
Malaysia
Benefits 
  • Foreign-source income is not taxable in Malaysia.
  • Can work part-time (20 hr/week).
  • Import personal / household items, tax exempted
  • Invest in local companies, share market & unit trusts
  • Interest gained from bank fixed deposit is tax exempted
  • Each participant is allowed to bring in a personal car. The vat (GST) tax exemption when buying a new car in Malaysia ended Apr 1, 2015.
  • Each participant is permitted to purchase residential houses at a minimum price above MYR 1,000,000 ($259,000) each such as Kuala Lumpur and Penang that are pre-approved by the Foreign Investment Committee of Malaysia. MYR 500,000 ($129,000)?
  • 10 years + renew for life
  • No minimum stay in Malaysia - come & go as you please
  • Tropical Temperature Year Round 75 - 90° F /
    Hill Resorts 54 - 68° F
  • Quality Low Living Cost - From $15-25/day ($300-750/mo)
  • One mo 2 BR Service Apartment from $700/mo
    Yr long 3 BR Condominium from $600/mo
  • Good Modern Infrastructure - Roads / Air Links / 1st Class Medical Facilities
Requirements 
  • Show that they have sufficient funds to maintain themselves for the duration of the 10-year visa. In practice, this means showing at least MYR150,000 
    ($38,000) in the bank
    and MYR10,000 
    ($2,550) monthly income.
    After a period of one year, the participant who fulfills the fixed deposit criteria can withdraw up to MYR50,000.00 ($13,000) for approved expenses relating to house purchase, education for children in Malaysia and medical purposes. However, a minimum balance of MYR100,000.00 
    ($25,500) maintained
    from the second year onwards and throughout stay in Malaysia under this program.
  • All applicants and their dependents (spouse and children) are required to submit a medical report from any private hospital in Malaysia.
  • Medical insurance 2252-4399RM/yr  ($580-1133).
Thailand
Skinny
The retirement visa lasts for a year and you can renew it without leaving the country. To qualify, you should have at least $26,000 in your bank account, or deposits + annual income > $26,000. You need to report to the immigration police every 90 days while staying in Thailand. You should also note that you need to apply for a re-entry permit if you want to leave Thailand and return before your retirement visa expires.
Best option is to apply for the Non Immigrant O-A visa before they make their way to Thailand. This visa is has multiple entry and is valid for 1 year. Each entry they would get 1 of Admitted to Stay, so they can get almost 2 years of stay out of this visa. For travelling during the second year they need a re-entry permit. Source
Nicaragua
Pros  The major benefits of the program come in the form of tax incentives. As a foreign retiree, you're entitled to:
  • Pay no taxes on any out-of-country earnings
  • Residency for five years, with the ability to renew
  • Bring into Nicaragua up to US$20,000 worth of household goods for your own home, duty free
  • Pay no sales tax on purchase of $50,000 worth of products used to build your business
  • Import one automobile (value $25,000 or less) for personal or general use and pay no import tax or protective tariff and sell it after five years, again exempt from consumer sales tax
  • Import an additional vehicle every five years under the same duty exemptions.
Source
Cons  A foreign retiree "cannot work in any industrial or commercial activity or hold a job paid in local currency". But the Nicaraguan consulate in the United States assures us that the law is open to liberal interpretation. If you want to open a small hotel or restaurant, for example, an enterprise that would benefit the community in some way, say by attracting tourists or creating jobs, then you'd merely have to present your plan to the Ministry of Economy and Industry and ask for an exception to the rule. Source
Fees  At the time of writing (April 2015?), the fees for the temporary residence card (valid for 1 year) are C$2,000 ($65) and for a permanent residence card (valid for 5 years) C$5,000 ($160).
You'll also have costs for the certification and translation of documents. And since the application process typically lasts several months, be prepared to purchase extensions for your tourist visa for C$500 per 30 days, the so-called "prorroga".
If you enlist the help of a lawyer, expect to pay anything between US$300 and US$800 per person for his or her services. Source
Other Costs  Once you are a Nicaraguan resident, you must get the government's permission to leave the country, the so-called "visa de salida." Depending on how often you want to travel, you have the choice between purchasing a one-time exit visa (C$200), or one that is valid for 3 months (C$400), 6 months (C$800) or one year (C$1600). Source
Colombia
Taxes  Personal income tax (impuesto de renta) rates in Colombia range from 10% to 35% depending upon the level of income that you are on. The first 1090 pesos of income is considered to be tax free. Expats with residency status will find that for the first five years of their stay in the country they will only be taxed monies they earn in the country though after the five year deadline has passed they will have to pay taxes on all income, regardless of its country of origin. So those retiring to Colombia will not have to pay tax on their pension from the country of origin for the first five years but once the deadline is passed will need to submit the details to the Colombian tax office. It is also advisable to check the situation in your home country, as you may be required to pay taxes there too if there is no agreement in place with Colombia to avoid double charges. Source
Other references: