Espanola
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Espanola clear sky chart from 2005-11-06 to 2026-03-03.

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	16% 10% 4 8% 5% 4 4 3 5% 6% 35%	130816
	Night	15% 12% 4 9% 5% 4 4 3 5% 6% 33%	130492
Transparency	Day	49% 6% 12% 21% 11% 2	134312
	Night	51% 6% 12% 20% 11% 1	135083
Seeing	Day	22% 16% 32% 20% 7% 2	16950
	Night	21% 13% 31% 26% 9% 1	26331

By Month

Percentage Cloud Cover NE (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	13% 18% 7% 11% 4 4 4 3 4 5% 26%	4094
	11th to 20th	Day	11% 17% 7% 17% 8% 5% 5% 3 4 4 19%	4559
	21st to end	Day	10% 17% 7% 15% 7% 5% 4 4 4 5% 22%	5437
February	1st to 10th	Day	10% 17% 6% 11% 7% 6% 5% 4 4 5% 26%	1890
	11th to 20th	Day	12% 16% 6% 11% 6% 5% 4 4 4 5% 28%	1843
	21st to end	Day	11% 17% 6% 14% 7% 5% 4 3 4 5% 25%	1688
March	1st to 10th	Day	18% 13% 3 8% 4 4 4 3 5% 5% 33%	4717
	11th to 20th	Day	15% 13% 4 10% 5% 4 5% 3 5% 7% 29%	4980
	21st to end	Day	16% 13% 7% 8% 4 3 4 3 4 5% 34%	5465
April	1st to 10th	Day	17% 15% 4 7% 5% 4 5% 3 4 6% 30%	2360
	11th to 20th	Day	20% 11% 3 6% 4 4 4 4 5% 6% 35%	2572
	21st to end	Day	22% 9% 3 7% 4 4 3 3 5% 6% 36%	2600
May	1st to 10th	Day	19% 7% 2 7% 5% 4 4 3 4 6% 39%	5888
	11th to 20th	Day	16% 8% 2 6% 4 4 4 4 5% 6% 42%	6198
	21st to end	Day	18% 8% 3 6% 4 4 4 3 5% 6% 39%	7239
June	1st to 10th	Day	15% 7% 3 7% 5% 4 5% 4 6% 7% 38%	3000
	11th to 20th	Day	13% 6% 2 6% 5% 4 5% 4 6% 8% 40%	3000
	21st to end	Day	17% 7% 3 7% 5% 5% 5% 4 6% 7% 35%	3000
July	1st to 10th	Day	16% 7% 3 7% 5% 5% 4 3 6% 9% 36%	6819
	11th to 20th	Day	12% 4 2 6% 4 4 4 3 5% 7% 49%	6820
	21st to end	Day	11% 5% 2 5% 4 4 4 4 6% 8% 49%	6752
August	1st to 10th	Day	11% 6% 2 7% 4 5% 6% 4 7% 8% 40%	4234
	11th to 20th	Day	17% 5% 2 5% 3 4 4 4 5% 8% 41%	4174
	21st to end	Day	13% 5% 2 5% 4 4 4 3 6% 7% 45%	4675
September	1st to 10th	Day	14% 7% 3 7% 5% 4 5% 4 6% 7% 39%	2384
	11th to 20th	Day	13% 5% 2 6% 4 4 5% 4 5% 7% 46%	2200
	21st to end	Day	20% 8% 3 6% 5% 4 4 3 4 6% 38%	2200
October	1st to 10th	Day	19% 8% 3 6% 4 4 4 3 5% 7% 38%	2045
	11th to 20th	Day	24% 9% 3 8% 5% 4 6% 3 5% 6% 26%	2000
	21st to end	Day	25% 13% 3 8% 4 4 3 3 6% 6% 25%	2045
November	1st to 10th	Day	19% 12% 3 8% 5% 5% 3 3 5% 7% 29%	1781
	11th to 20th	Day	16% 16% 4 9% 5% 5% 5% 3 4 5% 25%	1680
	21st to end	Day	20% 21% 5% 10% 6% 4 4 3 3 4 20%	1680
December	1st to 10th	Day	13% 21% 7% 10% 6% 4 4 4 6% 6% 20%	2553
	11th to 20th	Day	18% 17% 8% 11% 5% 3 3 3 3 5% 22%	2691
	21st to end	Day	28% 19% 6% 9% 4 3 3 2 3 3 19%	3553
January	1st to 10th	Night	12% 14% 7% 12% 6% 5% 5% 4 5% 6% 25%	8831
	11th to 20th	Night	12% 19% 7% 13% 5% 4 5% 3 5% 5% 22%	8338
	21st to end	Night	9% 15% 7% 14% 7% 6% 6% 4 5% 5% 22%	8759
February	1st to 10th	Night	12% 15% 5% 12% 6% 5% 5% 4 5% 6% 25%	2730
	11th to 20th	Night	11% 15% 5% 11% 7% 5% 5% 4 5% 6% 28%	2663
	21st to end	Night	11% 17% 5% 9% 6% 5% 5% 4 5% 6% 26%	2113
March	1st to 10th	Night	17% 11% 3 8% 4 4 4 3 5% 6% 35%	5168
	11th to 20th	Night	13% 10% 4 10% 5% 5% 5% 4 5% 7% 31%	4979
	21st to end	Night	18% 11% 7% 9% 4 4 4 2 4 5% 33%	5467
April	1st to 10th	Night	19% 10% 3 7% 5% 5% 4 3 5% 5% 34%	2056
	11th to 20th	Night	19% 9% 3 6% 4 3 4 3 5% 6% 38%	1777
	21st to end	Night	20% 9% 3 8% 5% 4 4 4 4 5% 34%	1800
May	1st to 10th	Night	17% 7% 3 7% 5% 5% 4 4 5% 6% 39%	4053
	11th to 20th	Night	12% 7% 3 6% 4 4 5% 3 5% 7% 43%	3679
	21st to end	Night	15% 10% 3 7% 4 4 4 3 5% 7% 37%	3634
June	1st to 10th	Night	12% 6% 2 8% 5% 5% 6% 5% 7% 8% 38%	1400
	11th to 20th	Night	11% 6% 3 5% 5% 4 5% 4 6% 9% 43%	1400
	21st to end	Night	14% 6% 3 7% 4 4 4 3 6% 8% 41%	1400
July	1st to 10th	Night	14% 7% 2 6% 4 4 4 3 5% 7% 43%	3160
	11th to 20th	Night	11% 4 2 4 4 3 4 3 5% 8% 52%	3160
	21st to end	Night	10% 5% 2 5% 4 4 4 3 5% 8% 51%	4107
August	1st to 10th	Night	10% 6% 2 6% 5% 5% 4 5% 7% 7% 44%	2915
	11th to 20th	Night	14% 5% 2 6% 4 3 4 3 6% 7% 46%	2875
	21st to end	Night	11% 4 2 5% 4 3 4 4 5% 7% 52%	3223
September	1st to 10th	Night	13% 7% 2 6% 4 4 4 3 6% 7% 45%	1993
	11th to 20th	Night	12% 4 2 4 4 3 4 3 4 8% 53%	2200
	21st to end	Night	17% 8% 3 6% 4 4 3 3 5% 6% 41%	2200
October	1st to 10th	Night	20% 7% 2 6% 4 4 4 3 4 7% 40%	2355
	11th to 20th	Night	24% 10% 3 7% 4 4 4 4 4 6% 31%	2400
	21st to end	Night	24% 11% 3 8% 5% 4 4 3 5% 5% 28%	2793
November	1st to 10th	Night	17% 13% 3 7% 5% 4 4 3 5% 7% 33%	2735
	11th to 20th	Night	18% 13% 4 9% 6% 5% 4 3 5% 6% 27%	2940
	21st to end	Night	20% 17% 5% 8% 5% 4 4 3 4 5% 24%	2940
December	1st to 10th	Night	15% 19% 5% 10% 5% 5% 5% 4 5% 5% 23%	4846
	11th to 20th	Night	16% 17% 5% 12% 5% 4 4 3 4 5% 26%	5736
	21st to end	Night	25% 22% 7% 10% 4 3 3 2 3 4 18%	7667

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	61% 5% 9% 17% 6% 2	4095
	11th to 20th	Day	68% 5% 8% 10% 8% 1	4590
	21st to end	Day	64% 5% 6% 14% 11%	5437
February	1st to 10th	Day	60% 5% 11% 16% 7% 1	1890
	11th to 20th	Day	58% 5% 10% 15% 10% 1	1852
	21st to end	Day	61% 5% 8% 16% 8% 1	1688
March	1st to 10th	Day	53% 5% 11% 11% 15% 5%	4720
	11th to 20th	Day	54% 5% 13% 16% 10% 2	4980
	21st to end	Day	53% 5% 13% 16% 11% 3	5465
April	1st to 10th	Day	54% 5% 11% 17% 11% 1	2360
	11th to 20th	Day	49% 5% 9% 22% 13% 2	2572
	21st to end	Day	49% 5% 10% 18% 14% 3	2600
May	1st to 10th	Day	44% 6% 10% 22% 14% 4	5897
	11th to 20th	Day	41% 6% 12% 20% 18% 3	6202
	21st to end	Day	46% 5% 12% 17% 15% 5%	7239
June	1st to 10th	Day	44% 6% 12% 22% 14% 2	3000
	11th to 20th	Day	42% 6% 12% 22% 17% 1	3000
	21st to end	Day	47% 7% 13% 20% 12% 2	3000
July	1st to 10th	Day	43% 8% 16% 23% 10% 1	6746
	11th to 20th	Day	33% 6% 15% 36% 9% 1	6739
	21st to end	Day	32% 6% 15% 33% 14%	6557
August	1st to 10th	Day	38% 8% 15% 28% 10% 1	4221
	11th to 20th	Day	39% 7% 17% 26% 11%	4213
	21st to end	Day	36% 7% 15% 30% 11% 1	4674
September	1st to 10th	Day	43% 8% 14% 24% 10% 1	2384
	11th to 20th	Day	36% 7% 16% 29% 12%	2200
	21st to end	Day	48% 7% 13% 23% 8% 1	2200
October	1st to 10th	Day	38% 5% 12% 29% 15%	3331
	11th to 20th	Day	46% 7% 14% 24% 8%	3240
	21st to end	Day	59% 6% 14% 14% 7% 1	3282
November	1st to 10th	Day	55% 5% 13% 20% 6%	1781
	11th to 20th	Day	60% 7% 12% 14% 7%	1680
	21st to end	Day	68% 4 11% 12% 5%	1680
December	1st to 10th	Day	63% 8% 15% 10% 4 1	2553
	11th to 20th	Day	65% 5% 8% 14% 8% 1	2691
	21st to end	Day	71% 5% 6% 11% 7%	3553
January	1st to 10th	Night	57% 8% 11% 16% 7% 1	8831
	11th to 20th	Night	63% 6% 10% 12% 9%	8382
	21st to end	Night	61% 6% 9% 13% 10% 1	8759
February	1st to 10th	Night	58% 6% 10% 18% 7% 1	2730
	11th to 20th	Night	56% 5% 13% 17% 7% 1	2665
	21st to end	Night	57% 7% 11% 15% 9% 1	2113
March	1st to 10th	Night	49% 6% 11% 16% 14% 4	5178
	11th to 20th	Night	51% 6% 16% 17% 8% 1	4980
	21st to end	Night	54% 4 9% 17% 14% 3	5467
April	1st to 10th	Night	51% 5% 9% 20% 13% 1	2056
	11th to 20th	Night	47% 5% 7% 24% 16% 1	1777
	21st to end	Night	52% 5% 10% 17% 15% 3	1800
May	1st to 10th	Night	44% 7% 9% 21% 15% 4	4060
	11th to 20th	Night	40% 6% 10% 23% 18% 3	3680
	21st to end	Night	45% 7% 9% 22% 11% 5%	3635
June	1st to 10th	Night	41% 7% 12% 22% 15% 2	1400
	11th to 20th	Night	38% 7% 12% 23% 19% 2	1400
	21st to end	Night	40% 6% 15% 24% 13% 2	1400
July	1st to 10th	Night	38% 6% 14% 27% 13% 1	3125
	11th to 20th	Night	31% 6% 14% 37% 12% 1	3118
	21st to end	Night	30% 6% 15% 32% 17%	3988
August	1st to 10th	Night	36% 9% 15% 28% 12% 1	2904
	11th to 20th	Night	36% 7% 19% 26% 11% 1	2902
	21st to end	Night	31% 7% 15% 33% 13% 1	3223
September	1st to 10th	Night	38% 6% 16% 27% 10% 2	1993
	11th to 20th	Night	31% 6% 17% 36% 11%	2200
	21st to end	Night	44% 6% 15% 25% 10%	2200
October	1st to 10th	Night	38% 6% 12% 29% 16%	3849
	11th to 20th	Night	43% 6% 13% 30% 7%	3899
	21st to end	Night	51% 7% 18% 17% 6% 1	4506
November	1st to 10th	Night	50% 6% 14% 21% 8%	2735
	11th to 20th	Night	57% 6% 13% 16% 8%	2940
	21st to end	Night	62% 7% 11% 12% 7%	2940
December	1st to 10th	Night	62% 7% 13% 14% 4	4846
	11th to 20th	Night	61% 6% 9% 13% 11% 1	5735
	21st to end	Night	70% 5% 8% 11% 6%	7667

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	24% 17% 36% 16% 6%	220
	11th to 20th	Day	20% 19% 37% 19% 5% 1	308
	21st to end	Day	23% 15% 33% 22% 6% 1	363
February	1st to 10th	Day	25% 28% 30% 12% 5%	330
	11th to 20th	Day	23% 23% 40% 11% 3	330
	21st to end	Day	28% 28% 36% 7% 1	273
March	1st to 10th	Day	26% 22% 33% 15% 4	396
	11th to 20th	Day	23% 18% 36% 17% 5% 1	500
	21st to end	Day	29% 19% 31% 16% 4 1	550
April	1st to 10th	Day	25% 20% 28% 21% 6% 1	500
	11th to 20th	Day	32% 19% 24% 15% 9% 2	492
	21st to end	Day	33% 17% 27% 15% 6% 2	500
May	1st to 10th	Day	22% 17% 34% 19% 5% 3	503
	11th to 20th	Day	21% 17% 31% 19% 8% 3	527
	21st to end	Day	21% 14% 36% 21% 7% 1	694
June	1st to 10th	Day	16% 20% 38% 21% 4 1	730
	11th to 20th	Day	19% 15% 38% 21% 6% 1	730
	21st to end	Day	21% 17% 34% 19% 7% 2	730
July	1st to 10th	Day	12% 17% 36% 26% 7% 2	721
	11th to 20th	Day	12% 14% 36% 25% 9% 3	718
	21st to end	Day	12% 11% 39% 25% 10% 4	716
August	1st to 10th	Day	16% 10% 26% 30% 14% 4	526
	11th to 20th	Day	14% 7% 31% 27% 14% 8%	519
	21st to end	Day	15% 14% 28% 23% 14% 5%	583
September	1st to 10th	Day	18% 12% 28% 25% 12% 5%	530
	11th to 20th	Day	15% 10% 25% 30% 13% 8%	530
	21st to end	Day	27% 12% 23% 24% 11% 3	530
October	1st to 10th	Day	24% 14% 30% 20% 10% 2	530
	11th to 20th	Day	28% 17% 33% 17% 4 1	530
	21st to end	Day	32% 20% 31% 15% 1 1	428
November	1st to 10th	Day	29% 21% 32% 14% 4	291
	11th to 20th	Day	25% 21% 33% 18% 3	220
	21st to end	Day	30% 23% 29% 15% 3	220
December	1st to 10th	Day	23% 17% 34% 18% 8%	220
	11th to 20th	Day	32% 19% 34% 13% 2	220
	21st to end	Day	37% 18% 28% 13% 4	242
January	1st to 10th	Night	22% 15% 34% 23% 5%	1050
	11th to 20th	Night	26% 17% 27% 24% 6%	1050
	21st to end	Night	20% 11% 33% 26% 8%	1050
February	1st to 10th	Night	19% 17% 36% 23% 5%	840
	11th to 20th	Night	18% 18% 33% 25% 6%	823
	21st to end	Night	22% 16% 36% 21% 4	692
March	1st to 10th	Night	18% 17% 38% 22% 4	809
	11th to 20th	Night	19% 16% 37% 21% 7%	800
	21st to end	Night	21% 14% 34% 24% 6% 1	880
April	1st to 10th	Night	24% 14% 34% 24% 5%	741
	11th to 20th	Night	25% 13% 28% 23% 10% 1	593
	21st to end	Night	24% 15% 27% 26% 9%	600
May	1st to 10th	Night	15% 9% 35% 32% 8% 1	600
	11th to 20th	Night	15% 11% 34% 31% 9%	446
	21st to end	Night	15% 11% 34% 30% 11%	433
June	1st to 10th	Night	15% 8% 38% 33% 7%	400
	11th to 20th	Night	14% 9% 33% 37% 8%	400
	21st to end	Night	15% 9% 29% 35% 12%	400
July	1st to 10th	Night	10% 7% 32% 42% 9%	390
	11th to 20th	Night	11% 4 28% 43% 13%	388
	21st to end	Night	11% 5% 29% 38% 15% 1	647
August	1st to 10th	Night	12% 4 25% 38% 20% 1	597
	11th to 20th	Night	13% 5% 22% 34% 23% 3	594
	21st to end	Night	13% 6% 27% 31% 20% 2	660
September	1st to 10th	Night	17% 8% 28% 30% 16% 2	749
	11th to 20th	Night	14% 9% 25% 29% 20% 4	800
	21st to end	Night	21% 9% 25% 29% 15% 2	800
October	1st to 10th	Night	23% 9% 28% 28% 11% 1	800
	11th to 20th	Night	29% 13% 28% 21% 8% 1	800
	21st to end	Night	29% 14% 28% 24% 4 1	880
November	1st to 10th	Night	25% 15% 28% 25% 6%	820
	11th to 20th	Night	26% 16% 28% 24% 7%	840
	21st to end	Night	31% 15% 31% 19% 4	840
December	1st to 10th	Night	26% 16% 32% 19% 6%	914
	11th to 20th	Night	26% 17% 32% 20% 5% 1	1050
	21st to end	Night	32% 16% 28% 19% 5%	1155

Page generated at 2026-02-28 01:40:26. Version ac07

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