Taos
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Taos clear sky chart from 2005-11-06 to 2024-03-23.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	4 6% 2 4 4 3 4 5% 6% 7% 55%	78897
	Night	4 7% 3 4 4 2 4 4 5% 7% 57%	81053
Transparency	Day	26% 6% 13% 22% 24% 10%	78613
	Night	25% 6% 12% 23% 24% 9%	80859
Seeing	Day	10% 19% 30% 26% 13% 2	14330
	Night	7% 11% 32% 33% 15% 2	24589

By Month

Percentage Cloud Cover SW (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	1 8% 5% 7% 4 3 2 3 5% 8% 53%	2637
	11th to 20th	Day	2 12% 7% 8% 4 1 2 2 4 6% 51%	2860
	21st to end	Day	3 10% 4 7% 6% 3 4 3 5% 6% 51%	3146
February	1st to 10th	Day	2 11% 4 5% 3 2 3 4 4 7% 56%	1748
	11th to 20th	Day	2 8% 3 6% 4 2 3 3 5% 8% 56%	1849
	21st to end	Day	3 11% 4 6% 4 2 3 3 5% 7% 52%	1570
March	1st to 10th	Day	3 9% 2 3 3 2 3 4 4 9% 57%	1943
	11th to 20th	Day	4 8% 3 5% 5% 3 4 4 6% 7% 52%	2090
	21st to end	Day	4 9% 4 5% 5% 3 3 4 4 6% 54%	2300
April	1st to 10th	Day	3 7% 1 4 3 3 4 4 4 6% 60%	2160
	11th to 20th	Day	4 8% 2 4 3 2 4 5% 5% 6% 57%	2131
	21st to end	Day	5% 7% 2 3 3 3 4 4 5% 8% 56%	2160
May	1st to 10th	Day	4 5% 2 2 4 3 5% 5% 5% 8% 57%	2160
	11th to 20th	Day	5% 5% 2 5% 4 3 5% 6% 7% 8% 50%	2303
	21st to end	Day	3 2 1 3 4 2 5% 4 5% 8% 62%	2724
June	1st to 10th	Day	2 2 1 3 3 2 5% 5% 7% 10% 60%	2520
	11th to 20th	Day	2 1 1 2 2 2 4 5% 7% 7% 67%	2520
	21st to end	Day	4 3 1 3 4 3 6% 6% 7% 8% 56%	2520
July	1st to 10th	Day	4 4 2 4 5% 4 7% 7% 8% 9% 45%	2520
	11th to 20th	Day	3 4 2 4 6% 4 8% 8% 9% 11% 41%	2433
	21st to end	Day	7% 5% 3 6% 7% 5% 9% 8% 10% 10% 31%	2545
August	1st to 10th	Day	6% 4 3 5% 6% 4 6% 7% 8% 10% 41%	2261
	11th to 20th	Day	5% 3 2 4 7% 5% 7% 6% 7% 8% 46%	2123
	21st to end	Day	6% 3 2 5% 5% 3 6% 6% 8% 9% 47%	2376
September	1st to 10th	Day	7% 4 2 5% 5% 4 5% 6% 6% 7% 49%	2160
	11th to 20th	Day	6% 4 2 4 4 2 4 5% 6% 7% 56%	2157
	21st to end	Day	4 2 1 3 3 3 4 4 5% 7% 64%	1978
October	1st to 10th	Day	7% 4 3 4 5% 2 5% 4 6% 6% 55%	1800
	11th to 20th	Day	4 3 1 2 3 2 2 3 3 4 75%	1800
	21st to end	Day	6% 4 1 2 3 1 3 3 3 4 69%	1980
November	1st to 10th	Day	2 4 1 2 2 2 2 3 4 9% 70%	1729
	11th to 20th	Day	3 4 1 2 3 2 3 3 4 7% 69%	1710
	21st to end	Day	2 8% 3 5% 3 2 2 3 4 6% 60%	1710
December	1st to 10th	Day	5% 6% 3 5% 2 1 2 3 4 7% 61%	1554
	11th to 20th	Day	3 9% 3 4 4 3 4 5% 5% 10% 51%	1926
	21st to end	Day	2 8% 4 4 4 2 3 3 4 6% 59%	2794
January	1st to 10th	Night	2 9% 6% 7% 5% 3 3 4 3 6% 52%	4348
	11th to 20th	Night	3 15% 7% 6% 5% 2 3 3 4 5% 46%	4110
	21st to end	Night	3 12% 4 6% 5% 2 3 3 4 7% 51%	4521
February	1st to 10th	Night	2 11% 4 6% 3 2 3 3 3 7% 57%	2432
	11th to 20th	Night	3 10% 3 6% 4 2 3 3 4 6% 55%	2218
	21st to end	Night	5% 12% 3 5% 3 2 2 3 3 6% 55%	1884
March	1st to 10th	Night	4 9% 2 4 4 1 3 3 3 6% 60%	2235
	11th to 20th	Night	4 9% 2 5% 3 2 4 2 4 6% 58%	2090
	21st to end	Night	5% 7% 3 4 3 2 3 3 4 6% 60%	2099
April	1st to 10th	Night	4 6% 1 3 4 2 3 3 5% 7% 62%	1800
	11th to 20th	Night	3 7% 2 4 4 3 4 3 5% 7% 57%	1777
	21st to end	Night	6% 7% 2 3 4 2 4 4 5% 5% 59%	1800
May	1st to 10th	Night	4 3 1 4 4 2 4 5% 4 6% 63%	1800
	11th to 20th	Night	6% 4 2 5% 4 2 4 4 5% 8% 54%	1587
	21st to end	Night	4 3 1 3 2 2 4 3 5% 7% 66%	1552
June	1st to 10th	Night	1 2 1 2 3 2 6% 6% 8% 9% 60%	1440
	11th to 20th	Night	2 2 1 3 3 2 4 4 6% 6% 68%	1440
	21st to end	Night	3 2 2 3 5% 3 5% 5% 7% 10% 55%	1440
July	1st to 10th	Night	3 4 2 5% 5% 4 7% 8% 7% 10% 46%	1440
	11th to 20th	Night	2 2 1 4 5% 3 7% 7% 9% 11% 50%	1522
	21st to end	Night	3 4 2 5% 7% 4 7% 8% 10% 13% 37%	1773
August	1st to 10th	Night	4 2 2 4 4 4 6% 9% 8% 12% 46%	1677
	11th to 20th	Night	4 4 1 5% 6% 4 7% 7% 8% 10% 43%	1778
	21st to end	Night	4 3 2 3 5% 3 5% 7% 8% 12% 48%	1980
September	1st to 10th	Night	6% 3 2 3 4 4 6% 6% 6% 9% 52%	1800
	11th to 20th	Night	4 2 1 2 3 2 4 4 5% 9% 62%	1801
	21st to end	Night	6% 3 1 3 3 2 3 3 5% 6% 67%	1980
October	1st to 10th	Night	6% 4 2 4 3 2 3 4 4 6% 62%	2159
	11th to 20th	Night	3 3 1 2 2 1 1 2 3 6% 76%	2160
	21st to end	Night	5% 5% 1 2 2 2 3 3 4 7% 67%	2376
November	1st to 10th	Night	3 3 1 2 2 1 2 2 4 6% 73%	2328
	11th to 20th	Night	3 4 1 2 2 1 2 2 5% 6% 73%	2470
	21st to end	Night	4 7% 3 3 3 1 3 3 5% 7% 61%	2470
December	1st to 10th	Night	4 9% 2 4 3 2 2 3 3 6% 61%	2622
	11th to 20th	Night	4 9% 3 5% 4 2 4 4 6% 9% 52%	3271
	21st to end	Night	3 10% 4 6% 5% 2 3 4 3 6% 55%	4873

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	27% 3 13% 31% 23% 3	2638
	11th to 20th	Day	30% 6% 17% 30% 15% 2	2860
	21st to end	Day	33% 6% 11% 25% 20% 4	3146
February	1st to 10th	Day	30% 4 14% 23% 22% 7%	1748
	11th to 20th	Day	28% 4 11% 25% 25% 7%	1859
	21st to end	Day	30% 4 8% 17% 29% 11%	1570
March	1st to 10th	Day	25% 5% 10% 21% 27% 11%	1943
	11th to 20th	Day	30% 4 12% 22% 26% 6%	2090
	21st to end	Day	31% 4 11% 23% 24% 7%	2300
April	1st to 10th	Day	23% 4 12% 23% 25% 13%	2160
	11th to 20th	Day	26% 6% 8% 21% 28% 11%	2134
	21st to end	Day	25% 5% 10% 24% 27% 9%	2160
May	1st to 10th	Day	23% 5% 12% 19% 29% 11%	2160
	11th to 20th	Day	29% 8% 15% 19% 23% 7%	2307
	21st to end	Day	20% 6% 11% 19% 26% 18%	2724
June	1st to 10th	Day	17% 7% 13% 22% 24% 17%	2520
	11th to 20th	Day	14% 5% 10% 17% 26% 29%	2520
	21st to end	Day	23% 6% 13% 20% 20% 17%	2520
July	1st to 10th	Day	32% 10% 15% 14% 15% 13%	2451
	11th to 20th	Day	30% 11% 19% 21% 11% 8%	2358
	21st to end	Day	42% 14% 23% 16% 5% 1	2404
August	1st to 10th	Day	35% 13% 19% 15% 11% 8%	2246
	11th to 20th	Day	32% 10% 16% 20% 15% 7%	2123
	21st to end	Day	29% 11% 16% 23% 17% 4	2376
September	1st to 10th	Day	31% 7% 15% 19% 19% 9%	2160
	11th to 20th	Day	25% 6% 10% 20% 25% 14%	2157
	21st to end	Day	18% 4 10% 24% 32% 12%	1978
October	1st to 10th	Day	27% 7% 9% 18% 25% 13%	1800
	11th to 20th	Day	15% 2 7% 17% 41% 18%	1800
	21st to end	Day	19% 3 8% 24% 36% 10%	1980
November	1st to 10th	Day	14% 4 11% 23% 35% 12%	1729
	11th to 20th	Day	16% 3 10% 31% 32% 8%	1710
	21st to end	Day	25% 3 9% 21% 31% 11%	1710
December	1st to 10th	Day	22% 7% 14% 26% 22% 8%	1554
	11th to 20th	Day	27% 7% 15% 19% 26% 6%	1924
	21st to end	Day	23% 4 12% 23% 30% 8%	2794
January	1st to 10th	Night	31% 5% 13% 25% 22% 4	4348
	11th to 20th	Night	38% 7% 12% 25% 16% 3	4110
	21st to end	Night	31% 7% 11% 28% 21% 3	4521
February	1st to 10th	Night	29% 3 14% 24% 23% 7%	2432
	11th to 20th	Night	30% 5% 11% 26% 23% 6%	2218
	21st to end	Night	30% 3 7% 19% 32% 9%	1884
March	1st to 10th	Night	25% 5% 9% 24% 28% 9%	2235
	11th to 20th	Night	28% 4 10% 25% 26% 7%	2090
	21st to end	Night	26% 4 11% 24% 30% 6%	2099
April	1st to 10th	Night	22% 4 11% 25% 27% 11%	1800
	11th to 20th	Night	25% 6% 10% 20% 26% 12%	1777
	21st to end	Night	25% 7% 11% 23% 26% 10%	1800
May	1st to 10th	Night	21% 6% 11% 20% 30% 12%	1800
	11th to 20th	Night	28% 9% 13% 18% 22% 10%	1588
	21st to end	Night	17% 7% 13% 20% 24% 19%	1552
June	1st to 10th	Night	17% 11% 15% 19% 21% 17%	1440
	11th to 20th	Night	14% 6% 8% 15% 26% 31%	1440
	21st to end	Night	22% 8% 15% 18% 21% 17%	1440
July	1st to 10th	Night	30% 13% 15% 16% 11% 15%	1400
	11th to 20th	Night	22% 14% 22% 21% 13% 8%	1474
	21st to end	Night	33% 16% 29% 16% 5%	1674
August	1st to 10th	Night	25% 18% 22% 15% 11% 9%	1668
	11th to 20th	Night	31% 13% 19% 19% 11% 6%	1778
	21st to end	Night	24% 12% 20% 23% 16% 5%	1980
September	1st to 10th	Night	27% 8% 16% 22% 18% 9%	1800
	11th to 20th	Night	19% 8% 15% 18% 26% 15%	1801
	21st to end	Night	19% 5% 10% 22% 32% 12%	1980
October	1st to 10th	Night	22% 7% 11% 20% 26% 14%	2159
	11th to 20th	Night	12% 3 7% 18% 41% 18%	2160
	21st to end	Night	19% 4 8% 25% 34% 10%	2376
November	1st to 10th	Night	13% 3 9% 25% 38% 12%	2328
	11th to 20th	Night	13% 3 10% 32% 33% 9%	2470
	21st to end	Night	24% 4 10% 21% 30% 11%	2470
December	1st to 10th	Night	25% 5% 10% 30% 25% 5%	2622
	11th to 20th	Night	29% 4 13% 23% 26% 5%	3272
	21st to end	Night	29% 4 12% 23% 27% 4	4873

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	12% 28% 29% 21% 10%	270
	11th to 20th	Day	17% 24% 30% 24% 5% 1	270
	21st to end	Day	6% 20% 40% 23% 10% 1	297
February	1st to 10th	Day	10% 31% 34% 19% 6%	270
	11th to 20th	Day	10% 39% 32% 16% 4	270
	21st to end	Day	22% 36% 27% 12% 2	225
March	1st to 10th	Day	15% 31% 30% 18% 5%	313
	11th to 20th	Day	17% 28% 32% 18% 4 1	460
	21st to end	Day	20% 39% 27% 12% 2	471
April	1st to 10th	Day	16% 33% 35% 12% 3 1	420
	11th to 20th	Day	19% 38% 30% 10% 2	412
	21st to end	Day	19% 35% 32% 12% 1	420
May	1st to 10th	Day	12% 33% 39% 13% 3	423
	11th to 20th	Day	11% 20% 34% 25% 9% 2	571
	21st to end	Day	8% 18% 35% 28% 10%	679
June	1st to 10th	Day	3 10% 34% 34% 17% 1	630
	11th to 20th	Day	4 13% 35% 29% 16% 3	630
	21st to end	Day	5% 10% 30% 29% 22% 3	630
July	1st to 10th	Day	7% 4 21% 36% 29% 5%	621
	11th to 20th	Day	5% 3 16% 40% 29% 8%	531
	21st to end	Day	7% 1 14% 37% 34% 7%	487
August	1st to 10th	Day	7% 4 22% 40% 23% 4	447
	11th to 20th	Day	5% 4 27% 39% 22% 4	437
	21st to end	Day	6% 3 23% 40% 23% 4	495
September	1st to 10th	Day	6% 6% 27% 36% 21% 4	450
	11th to 20th	Day	6% 7% 36% 33% 15% 3	447
	21st to end	Day	3 15% 26% 34% 17% 5%	270
October	1st to 10th	Day	6% 22% 26% 25% 16% 5%	270
	11th to 20th	Day	9% 19% 33% 26% 11% 4	270
	21st to end	Day	13% 19% 29% 27% 10% 2	297
November	1st to 10th	Day	11% 26% 29% 27% 7% 1	270
	11th to 20th	Day	6% 19% 36% 24% 14% 1	270
	21st to end	Day	10% 26% 33% 19% 10% 2	270
December	1st to 10th	Day	14% 22% 34% 19% 10% 2	270
	11th to 20th	Day	11% 22% 38% 23% 5% 1	270
	21st to end	Day	20% 26% 36% 15% 3 1	297
January	1st to 10th	Night	8% 15% 33% 32% 11% 1	907
	11th to 20th	Night	9% 13% 37% 30% 9% 2	760
	21st to end	Night	8% 11% 38% 30% 11% 1	836
February	1st to 10th	Night	9% 14% 42% 28% 6%	760
	11th to 20th	Night	9% 16% 45% 24% 5% 1	744
	21st to end	Night	13% 18% 47% 20% 1	628
March	1st to 10th	Night	10% 18% 41% 25% 6%	760
	11th to 20th	Night	10% 13% 32% 34% 10%	760
	21st to end	Night	10% 18% 41% 26% 5%	699
April	1st to 10th	Night	9% 23% 41% 24% 2	540
	11th to 20th	Night	9% 23% 35% 26% 6%	533
	21st to end	Night	9% 18% 42% 26% 5%	540
May	1st to 10th	Night	6% 12% 41% 32% 9%	540
	11th to 20th	Night	8% 11% 32% 34% 14% 1	531
	21st to end	Night	6% 10% 36% 39% 9%	584
June	1st to 10th	Night	2 5% 26% 47% 19%	540
	11th to 20th	Night	1 6% 35% 45% 13% 1	540
	21st to end	Night	2 4 24% 42% 26% 2	540
July	1st to 10th	Night	3 1 13% 46% 34% 3	525
	11th to 20th	Night	2 1 8% 37% 48% 5%	522
	21st to end	Night	4 1 6% 31% 50% 8%	591
August	1st to 10th	Night	3 1 9% 34% 46% 7%	537
	11th to 20th	Night	3 3 11% 44% 36% 3	534
	21st to end	Night	3 1 11% 43% 37% 4	594
September	1st to 10th	Night	6% 1 15% 45% 31% 2	540
	11th to 20th	Night	4 3 16% 49% 26% 2	540
	21st to end	Night	6% 5% 23% 46% 19% 1	540
October	1st to 10th	Night	6% 8% 29% 38% 17% 2	719
	11th to 20th	Night	5% 8% 37% 34% 14% 2	720
	21st to end	Night	7% 10% 33% 32% 15% 4	792
November	1st to 10th	Night	5% 11% 30% 39% 13% 2	848
	11th to 20th	Night	5% 14% 34% 34% 12% 1	950
	21st to end	Night	9% 13% 33% 31% 13% 1	950
December	1st to 10th	Night	11% 16% 37% 26% 9% 1	950
	11th to 20th	Night	12% 15% 35% 30% 8%	950
	21st to end	Night	10% 15% 42% 26% 6%	1045

Page generated at 2024-03-19 21:31:06. Version ac07

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