A pleasant early winter weekend before a rainy Monday and cold runup to Christmas in Houston

Well, we made it to Friday again. The weather looks quiet this weekend for the most part. Next week is another matter. The main headlines today:

  • A few showers this evening or overnight before a nice weekend.
  • Widespread rain on Monday.
  • Strong cold arrives Thursday or Friday, but just how cold it gets remains elusive. A freeze is likely for most of the area, with a hard freeze becoming possible on at least one night.
  • While we will continue to watch things closely, we do not believe the upcoming cold will rival what we saw in 2021 in terms of intensity, duration, or impacts.

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Today

Alright, on to weather, and it’s a fine, albeit cool morning across the area. Most of us will see sunshine this morning, but look for clouds to roll in as the day progresses. This is ahead of a cold front to reinforce the dry, cool air over the region. Yes, we could see a few showers pop up along the front late this afternoon as it passes through, but I suspect any rain would be brief, and many of us will see nothing at all. High temperatures will make it into the mid-60s. Winds will kick up a bit out of the north behind the front.

Weekend

Saturday will probably start off with some clouds. There could even be a few lingering showers south of Houston, along the coast and down toward Matagorda Bay. I can’t promise that we’ll turn sunny in the afternoon, but the data suggests we gradually will. So hopefully it will be a day of decreasing clouds. It will be cooler and breezier Saturday, with highs in the low-50s and a gusty north wind (especially over the bays and Gulf).

We’ll have what should be our coldest night of this current stretch so far on Saturday night into Sunday morning. Look for 30s in most spots, with low-30s in far outlying areas and notorious cold spots like Conroe.

Sunday morning lows will be our chilliest so far in this stretch, with a light freeze possible well north and west of Houston. (Pivotal Weather)

Sunday itself should be generally sunny and continued cool, though with less wind. High temperatures should reach into the mid or upper-50s. There could be an influx of clouds during the afternoon, especially south of I-10.

Monday

Monday continues to look like a wet day. Expect off and on rain, sometimes steady to heavy in spots. It will add up to an inch or so across most of the region.

Monday’s rain totals will be somewhat unevenly distributed, but expect close to an inch in most of the area, with some seeing a bit less and others a bit more. (Pivotal Weather)

There will be a bit of a spread in temperature on Monday. Warm air is going to try to surge off the Gulf, so coastal areas could poke up above 60 degrees. Inland areas should stay mainly in the 50s, which will feel very damp with the increasing humidity in addition to the actual rain.

Tuesday & Wednesday

The midweek period does not look too bad, so if you’re out getting last minute gifts, it should be fine, aside from all the other people doing the exact same thing. We may have a few lingering showers on Tuesday, along with plenty of clouds. Highs will be in the 50s to perhaps near 60 or so. Morning lows will be around 50 degrees or in the upper-40s.

For Wednesday, I would anticipate some sunshine and probably another pleasant winter’s day with highs in the upper-50s after a morning of 40s.

Late next week/Arctic outbreak

Alright, so we’ve all been talking about this cold coming. And potentially snow! We know that has folks a little uneasy.

Bottom line: We expect at least a couple nights of freezing temperatures late next week, with an increasing risk of at least one night of a hard freeze (< 25°) in Houston. While we will continue to watch this forecast very closely, we do not believe that the intensity, duration, or impacts of the cold will rival what we saw in 2021, which saw mid or low teens for lows. Snow odds are much lower, but not quite zero.

First, the temperatures. Given the many distractions this time of year, and given that you have had over a week’s notice that this a freeze was possible, it is probably a good idea to take a moment this weekend to prepare your home for a potential hard freeze. Not a February 2021 type event. But a couple nights in the 20s and maybe a night in the teens outside the city.

The Texas Tribune published an article with a bunch of winter weather tips last year. Our advice is to use this as a base and take care of as much of the low hanging fruit as you can right now. Irrigation systems, maybe some very sensitive plants, etc.

In terms of specifics, what we’re able to say with some confidence is that “at least” a freeze is likely across the entire area on “at least” a couple nights, and a hard freeze (temps below 25°) is becoming increasingly likely on at least one night next week, probably Thursday night into Friday.

This map shows the probability of temperatures in the teens next Friday morning. For the City of Houston, it’s currently about 10 percent or less. (Weather Bell)

Whether this goes from a more typical once every few year event to something more problematic is still a question. While it’s unlikely that we will get into some more troublesome cold, it would be foolish of us to completely rule it out. The big thing I’m seeing right now is that daytime temperatures are expected to get well above freezing each day, something we did not see in 2021. We will continue to monitor this closely, but given the current low odds of temperatures in the teens and the expectation of above freezing daytimes, we do not believe this will rival 2021’s situation in terms of impacts.

As far as snow? Here is the European model’s interpretation of the chances we get an inch of snow next weekend. That’s about 10 percent. High for Houston, but not exactly anything I’d take Mattress Mack to Louisiana to bet on.

This map shows the European ensemble model’s chance of at least 1″ of snow through the 27th. It remains at 10 percent or less, high for Houston, but still unlikely. (Weather Bell)

That’s where we are right now. If we have any new insights to share, you’ll find a post from us this weekend. Meanwhile, enjoy the weekend!

No high humidity this year as Mother Nature celebrates the holiday season with Houston

Lows this morning have generally fallen in the 40s, which is fairly typical for December. We’re going to see more or less winter-like weather for at least the next 10 days, with the possibility of a light freeze for inland areas on Sunday morning, and colder weather still later next week. It’s really time for that winter coal, y’all!

Thursday

This will be a prototypical winter day in Houston, with highs in the low 60s, sunny skies, and light winds. Skies will be clear tonight, with lows dropping into the mid- to upper-40s in Houston with cooler conditions further inland.

Friday

As high pressure moves off to the east we’ll start to see the return of some atmospheric moisture, and as a result clouds will start to build in during the morning, or early afternoon hours at the latest. Look for highs in the mid-60s. There is a slight chance of some light rain as a reinforcing cool front moves into the area on Friday evening. Otherwise expect lows in the mid-40s.

Saturday

Skies will clear out on Saturday, likely during the morning hours, in the wake of the front. This will be a clear, cold day, with highs likely topping out in the mid-50s. Clear skies and decreasing winds will allow for optimal cooling conditions on Saturday night, and some outlying areas are likely to see a light freeze. At this time I believe the Houston metro area will remain just above freezing, however.

Low temperature forecast for Sunday morning. (Weather Bell)

Sunday

This will be another chilly day, with highs in the 50s most likely. Winds will revert to come from offshore pretty quickly, however, so we’ll start to see some clouds, and by Sunday evening skies should be mostly cloudy. Lows will drop into the mid-40s.

Monday

In response to increasing moisture levels and a low pressure system, we’ll see elevated rain chances on Monday. For most of the area I don’t think the rain will start until at least sunrise, and perhaps a bit later. Accumulations will probably be greater closer to the coast, where 1 to 2 inches is possible, with isolated higher totals. Skies will otherwise be cloudy, with highs likely topping out in the upper 50s.

NOAA rain accumulation forecast for Monday and Monday night. (Weather Bell)

Next week

We’re expecting conditions through the middle of next week to support high temperatures in the upper 50s to low 60s, with overnight temperatures generally in the 40s. The global forecast models are still strongly suggesting that a robust front will arrive with Arctic air around Wednesday or Thursday, causing temperatures to plummet a day or two before Christmas Day. Unfortunately, at this range, we don’t have the greatest of confidence in how cold things will get. The range of possibilities is this: lows might get as cold as the upper teens or they might only drop into the mid-30s. I’d lean toward a light freeze in Houston at this time, but my confidence is not particularly high. There also is a non-trivial chance of snow—at this point I’d give the metro area perhaps a 10 or 15 percent chance of a White Christmas.

The front finally made it, and the second half of December looks to be rather cold

The much-anticipated cool front finally rolled into Houston during the overnight hours. If you live along the coast, hold on, as the drier air is almost there. We’re also seeing some showers this morning as the front passes. They’re now primarily along the Interstate 69/Highway 59 corridor or further south, and they should continue to move down toward the coast. The bulk of this activity will be offshore by around 10 am. And so ends the warmest 10-day period December I can remember living through in Houston.

We’re still wrestling with several questions with the forecast. One of them is how cold it will get this weekend, as I think there’s a chance some far inland areas could see their first freeze of the season on Sunday morning. We’re also tracking the potential for a couple of inches of rainfall on Monday, and of course, just how cold it is going to get in Houston just ahead of the Christmas holiday. I think a light freeze, at least, is in the cards for most of the area. Will it get colder than that? Possibly. Will it snow? I’m still ballparking about a 10 percent chance for that, but ’tis the season.

Map of 24-hour temperature change as of 6:15 am CT Wednesday. If you’re near the coast, change is on the way. (Weather Bell)

Wednesday

As showers work their way down to the coast, we’re going to see clearing skies moving into the Houston area. I expect most of us will be seeing sunshine by early this afternoon, allowing high temperatures to remain in the low- to mid-60s. Winds will be out of the northwest at 10 to 15 mph, or so. But temperatures will fall off pretty quickly this evening, as winds die down. With clear skies I think most of Houston will drop into the low- to mid-40s.

Thursday and Friday

As I’ve been writing for awhile, these two days should be splendid examples of wintertime weather in Houston. Look for mostly sunny skies and highs in the low 60s. Overnight lows drop into the low- to mid-40s. Some clouds will start to return Friday afternoon or evening as moisture starts pooling inland from the Gulf of Mexico.

Saturday and Sunday

We’re going to see a chilly weekend, with highs on both days likely in the mid- to upper-50s. Saturday looks to be partly cloudy, but we should see some clearing by Saturday night and on Sunday. Conditions are supportive of temperatures bottoming out on Sunday morning, when I could see much of the Houston metro area dropping into the upper 30s, with colder conditions further inland. Both weekend days will see a slight chance of rainfall, but at this point I’m leaning toward high pressure winning out, and keeping most shower activity offshore.

Monday

Well, kids, I’m sorry. The first official day of Winter Break looks fairly wet as high pressure scoots off and is replaced by ample moisture from the Gulf of Mexico. I think the area is likely to pick up 1 to 2 inches of rainfall, with higher isolated totals, as the atmosphere lifts in response to an upper-level low. The air will be a tad muggier, and I expect high temperatures to reach the low 60s.

The rest of Christmas week

So what happens after Monday’s deluge? Rain chances look to back off on Monday night and Tuesday, but maybe not fade away entirely. We’ll see. The next couple of days look to be of the variety where we see partly sunny skies, with highs in the 60s, and lows in the 40s. Pencil that in for now. At some point—Thursday, the 23rd of December, maybe?—we’re likely to start seeing an influx of much colder, Arctic air. Still to be determined is how much of this colder air is modified or shunted east, and how much dives all the way down to the Gulf Coast.

This European ensemble model shows some of the uncertainty just ahead of Christmas. Nearly all of the ensemble members bring significantly colder air into Houston around December 23, but the range of possibilities is from the upper teens to the low 40s. (Weather Bell)

We’re still talking about a forecast 8 to 10 days from now so, you know, it’s basically blindfolds and crayons at this point. But the vast majority of our model guidance suggests a light freeze for Houston, at least, with the possibility of some lows in the 20s. I don’t think extreme, power-sapping cold is in the cards, but it’s not something I’m ready to rule out. As always, the details of the forecast, including the chance of wintry precipitation, will come into clearer focus the closer we get.

But hey, you wanted it to feel like Christmas, right? Sometimes wishes do come true.

Temperatures are going to plummet before Christmas. The question is how low they will go

The month of December has started off ridiculously warm. Through Monday the region has recorded an average temperature of 69 degrees, which is 12 degrees above normal. However, after one more day the greater Houston region will see a shift toward more winter-like weather. It is not going to get spectacularly cold, rather temperatures will just slip back toward our typical December pattern of highs generally in the 60s, with lows in the 40s. The real question is what comes after that. Looking at the big picture, we can see that the coldest air mass on the planet, at present, lies over the Siberia region of Russia, where surface temperatures in some locations are in the -55 to -75 degree Fahrenheit range.

Surface temperatures, in Celsius, as of Noon CT on Tuesday. We’ve highlighted a mass of cold air over Siberia. (Weather Bell)

The pattern over the next week suggests that this very cold air will be drawn into Canada. After that, it’s a matter of where this air mass goes. A preponderance of modeling brings it down into the Central United States. And then? Well the question is whether the air continues diving into the deep South, toward the Gulf of Mexico, or is shunted more eastward. At this point we are talking about weather 8 to 10 days from now, so uncertainty in this is high. However, there is clearly the potential for very cold air to move into Texas, whereby we could see lows in the teens over the Christmas holiday in Houston. Low temperatures might also be 40 degrees. This far out it is difficult to forecast with any real confidence. But it is going to get cold during the last week of this year. Perhaps even very cold to the point where we need to worry about pipes, pets, plants, and power. We should have more confidence in this forecast in a couple of days.

Tuesday

In contrast to what is coming later this month, Tuesday will be absolutely balmy. Low temperatures this morning have only fallen to around 70 degrees in Houston. We’re going to see spotty showers this morning, with perhaps some thunderstorms developing this afternoon or early evening ahead of a cold front. While we cannot rule out some severe storms, at this time I expect most of this weather to remain northeast of the Houston metro area. Look for highs today to push near 80 degrees, with high humidity. Winds will be gusty, out of the south, at up to 20 mph before the front. Drier air should move in with the front this evening, perhaps reaching the metro area around 6 to 9 pm, and the coast by around midnight.
Tuesday will probably be the last really warm day of 2022. (Weather Bell)

Wednesday

Lows on Wednesday morning may briefly dip into the 50s, but with clearing skies we should see highs climb into the low 60s. As moderate northerly winds back off on Wednesday night we’ll see low temperatures drop efficiently, down into the mid-40s in Houston, with colder conditions for outlying areas.

Thursday and Friday

These will be a pair of winter-like days, with sunny skies and highs in the vicinity of the low 60s. Overnight lows will be in the 40s. This period represents our best chance of guaranteed sunshine for awhile, so soak it up.

Saturday and Sunday

An additional shot of cooler air arrives on Friday night, and this will lead to chilly conditions this weekend with highs in the 50s, or possibly 60 degrees by Sunday. Both days will be partly sunny, but also have a decent chance of rain. The challenging part of the forecast is that we’re pretty confident there will be some showers offshore, but we’re not certain whether and how far this rainfall will migrate inland. So if you live south of Interstate 10, call it a 30 or 40 percent chance of light rain each day, with lesser chances further inland.

Monday

An onshore flow looks set to resume on Sunday, and this will probably set the stage for a wetter Monday ahead of the region’s next cold front. How wet? I would not be surprised to see 1 to 2 inches of rainfall on a warmer day when highs climb into the 60s, because there will be plenty of atmospheric moisture to work with.

Winter is coming to the Lower 48 states. Well, most of them. (Pivotal Weather)

Tuesday and beyond

We’ve got a cold front penciled in for Tuesday of next week, which may drop lows into the 30s for a few days. After that the most plausible scenario is a shot of even colder Arctic air, as discussed at the outset of this post. It becomes really difficult to parse details beyond this, but the overall pattern does support the influx of much colder air just prior to, and on Christmas Day. I think the atmosphere probably will be too dry to squeeze out any snowfall, but at this point I would not entirely rule out a white Christmas in Houston. I just would not put the chances at much higher than 10 percent.

Even though the holidays are coming, rest assured that Matt, Maria, and I will be covering this all for you as much as needed.