February First Month in Energy Bull Run; Use These ETFs to Trade It

February is a month known for Groundhog- , Valentine's- and Presidents' Day. Aside from these holidaies, February also marks the start of some important seasonal trends pertaining to the energy sector. The second month of the year is the first in what is historically a strong four-month run for energy stocks. Including data from 2012, the average energy sector's gain in February is one percent with the group rising in 12 of the previous 20 Februarys,

. Bullishness in February gives way to average gains for the sector of about three percent in March and April. Through last year, 14 of the previous 20 Marchs and 15 of the past 20 Aprils saw the energy sector rise, according to EquityClock data. May gives investors an opportunity to take profits with an average gain of just 0.7 percent over the past 20 years. With those seasonal trends in mind, here are some of the energy ETFs investors will want to be have on their screens in the weeks ahead:

Somewhat quietly, the First Trust ISE-Revere Natural Gas Index Fund is off to a banner start in 2013. Even when accounting for Tuesday's 0.54 percent decline, FCG is higher by about 4.4 percent year-to-date. Notable is the fact that February also marks the start of favorable season trends for natural gas-related fare, though that serves as an important factor about FCG that often goes overlooked. That fact is that FCG

. Yes, the ETF has "natural gas" in its name. And yes, holdings such as Chesapeake Energy

and Range Resources

mean some level of correlation to natural gas prices. All that said, FCG is oilier than it appears at first glance. Some of the companies found in this ETF trying to bolster oil production over gas: think Chesapeake, Devon Energy

and some others, but those like EOG Resources

and Apache

are oil plays. Arguably, FCG's oil exposure is something the ETF is not always given credit for.

Since IEO was

, the ETF has jumped four percent. The fund's performance over the past month is even more impressive, showing an almost 11 percent gain. IEO is home to 61 stocks, but the rub is that the ETF is not too diverse as the top-10 holdings represent about 65 percent of the fund's total weight. The bad news with that scenario is that if some of IEO's top holdings lag in the coming months, the ETF will follow suit. On the other hand, if select IEO constituents keep their current trend of out-performance going, the ETF could make a run to $80 in the coming months. Occidental Petroleum

, which accounts for almost 14 percent of IEO's weight, has sharply outpaced rivals Exxon Mobil

and Chevron

this year. Up 9.7 percent year-to-date, Anadarko Petroleum

has been a leader among large-cap U.S. independent exploration and production companies. Likewise, Phillips 66

has a been a star among refiners. Anadarko and Phillips combine for almost 16 percent of IEO's weight.

First, the cautionary tale. Investors that do not like small, or thinly traded ETFs probably will not like IOIL. To each his own, but passing over IOIL has meant missing out on returns of over 15 percent over the past three months. There are couple of things to note about IOIL before jumping in. The ETF does live up to its name in that about half its weight is allocated to non-U.S. companies. That includes a roughly nine percent allocation to emerging markets. Also, the ETF features exposure -- albeit slight -- to various foreign currencies, including the Canadian dollar, Thai baht and Japanese yen. One point of allure: IOIL does a good job of spreading its weight between exploration and production firms, oil services names and refiners. IOIL's 39.2 weight to refiners will reward investors if that sub-sector of the energy space keeps soaring. For more on ETFs, click

.