Agate Fossil Beds National Monument
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Agate Fossil Beds National Monument clear sky chart from 2005-11-06 to 2026-08-30.

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	6% 5% 2 5% 3 4 4 4 6% 8% 54%	152885
	Night	6% 6% 2 6% 4 4 4 4 6% 7% 51%	146871
Transparency	Day	27% 6% 12% 26% 21% 7%	147723
	Night	30% 7% 13% 27% 18% 5%	143045
Seeing	Day	10% 10% 31% 30% 16% 4	18365
	Night	9% 9% 38% 34% 9% 1	28246

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	2 6% 3 9% 6% 4 4 4 6% 6% 51%	4720
	11th to 20th	Day	3 9% 4 8% 5% 4 5% 4 6% 8% 45%	4740
	21st to end	Day	2 5% 2 8% 4 4 4 3 6% 6% 55%	5405
February	1st to 10th	Day	4 10% 4 8% 6% 5% 5% 4 5% 8% 42%	1890
	11th to 20th	Day	4 9% 4 7% 5% 5% 5% 5% 5% 8% 44%	2034
	21st to end	Day	2 9% 3 6% 4 3 4 3 6% 7% 53%	1730
March	1st to 10th	Day	7% 9% 3 6% 3 3 3 3 5% 8% 51%	4600
	11th to 20th	Day	6% 6% 2 5% 3 3 3 3 5% 7% 58%	4781
	21st to end	Day	10% 8% 3 7% 4 4 4 4 6% 8% 42%	6098
April	1st to 10th	Day	9% 9% 2 5% 3 4 4 3 6% 8% 47%	2520
	11th to 20th	Day	11% 8% 2 6% 4 5% 5% 4 6% 7% 42%	2491
	21st to end	Day	11% 9% 3 5% 4 4 4 4 6% 7% 44%	2612
May	1st to 10th	Day	10% 6% 2 5% 4 4 4 4 5% 7% 49%	7689
	11th to 20th	Day	11% 4 2 4 4 4 4 4 6% 8% 50%	8191
	21st to end	Day	13% 4 2 5% 3 4 4 4 5% 8% 48%	9026
June	1st to 10th	Day	6% 4 1 4 4 4 5% 5% 7% 9% 52%	2940
	11th to 20th	Day	7% 4 2 5% 3 4 4 4 6% 9% 53%	2940
	21st to end	Day	6% 2 1 3 3 4 5% 4 5% 9% 57%	2940
July	1st to 10th	Day	4 2 1 4 3 4 4 4 6% 9% 59%	8249
	11th to 20th	Day	4 2 1 3 2 3 4 3 6% 7% 65%	8250
	21st to end	Day	7% 3 2 5% 3 4 5% 4 7% 10% 51%	8957
August	1st to 10th	Day	7% 3 1 3 4 3 4 4 7% 9% 55%	6332
	11th to 20th	Day	3 2 2 4 3 3 5% 4 6% 8% 61%	5488
	21st to end	Day	7% 4 2 6% 4 4 4 4 6% 8% 51%	6093
September	1st to 10th	Day	5% 4 1 4 3 3 3 3 4 6% 63%	2400
	11th to 20th	Day	7% 3 1 4 3 3 3 3 5% 6% 63%	2323
	21st to end	Day	6% 4 1 4 2 2 2 3 4 7% 65%	2200
October	1st to 10th	Day	6% 3 1 2 2 2 2 2 3 4 74%	3412
	11th to 20th	Day	8% 6% 1 4 3 3 3 3 4 7% 59%	3250
	21st to end	Day	8% 7% 2 4 3 2 3 3 5% 7% 56%	3200
November	1st to 10th	Day	4 5% 2 4 3 3 4 5% 5% 9% 56%	1853
	11th to 20th	Day	4 4 1 4 3 3 3 4 6% 8% 59%	1890
	21st to end	Day	4 6% 3 5% 4 3 4 4 6% 7% 56%	1743
December	1st to 10th	Day	2 5% 2 4 3 4 4 3 5% 6% 62%	2700
	11th to 20th	Day	3 4 1 4 3 3 3 4 6% 9% 59%	3106
	21st to end	Day	3 7% 3 8% 5% 4 5% 3 5% 7% 50%	4092
January	1st to 10th	Night	3 8% 4 9% 5% 4 4 3 5% 7% 48%	8201
	11th to 20th	Night	2 7% 3 7% 4 4 4 4 5% 8% 51%	8250
	21st to end	Night	2 5% 3 8% 5% 4 5% 3 4 6% 54%	8867
February	1st to 10th	Night	4 9% 4 8% 5% 5% 5% 4 6% 9% 41%	2730
	11th to 20th	Night	4 9% 4 8% 5% 5% 5% 4 6% 8% 42%	2471
	21st to end	Night	4 8% 3 7% 4 4 5% 4 5% 7% 51%	2076
March	1st to 10th	Night	6% 10% 3 6% 3 3 3 3 3 5% 55%	5494
	11th to 20th	Night	4 6% 2 5% 4 4 4 3 5% 7% 56%	5409
	21st to end	Night	10% 8% 3 8% 4 5% 6% 4 6% 8% 38%	5096
April	1st to 10th	Night	10% 7% 3 6% 4 3 4 4 5% 8% 48%	2100
	11th to 20th	Night	10% 7% 3 7% 4 4 4 4 6% 7% 46%	2077
	21st to end	Night	13% 9% 2 7% 4 4 4 3 6% 6% 42%	2006
May	1st to 10th	Night	10% 7% 2 7% 4 4 4 3 4 6% 49%	5242
	11th to 20th	Night	11% 5% 2 5% 3 3 4 3 6% 8% 50%	4701
	21st to end	Night	13% 6% 2 5% 4 4 5% 4 6% 8% 43%	5181
June	1st to 10th	Night	5% 4 2 5% 4 4 4 4 8% 11% 49%	1680
	11th to 20th	Night	7% 3 1 4 4 3 3 5% 7% 10% 52%	1680
	21st to end	Night	5% 4 1 4 3 4 4 4 8% 10% 54%	1680
July	1st to 10th	Night	5% 3 2 6% 5% 4 6% 5% 7% 8% 49%	4740
	11th to 20th	Night	5% 3 1 4 3 4 4 4 6% 8% 59%	4740
	21st to end	Night	5% 4 2 6% 6% 6% 6% 5% 8% 9% 44%	5152
August	1st to 10th	Night	9% 3 2 5% 4 4 5% 4 6% 9% 49%	3697
	11th to 20th	Night	3 3 2 5% 4 5% 5% 4 7% 9% 52%	4578
	21st to end	Night	7% 5% 2 7% 5% 5% 5% 4 6% 8% 46%	5083
September	1st to 10th	Night	7% 4 2 4 3 3 3 3 4 7% 61%	2000
	11th to 20th	Night	6% 3 2 4 3 3 3 3 5% 6% 61%	2076
	21st to end	Night	8% 5% 1 4 3 3 3 2 4 5% 62%	2200
October	1st to 10th	Night	6% 3 1 2 2 1 2 2 3 4 74%	3771
	11th to 20th	Night	8% 3 1 5% 3 3 3 3 4 6% 59%	3898
	21st to end	Night	7% 5% 2 4 3 3 4 4 6% 7% 56%	4568
November	1st to 10th	Night	6% 5% 2 4 3 3 4 3 5% 8% 55%	2665
	11th to 20th	Night	4 4 2 6% 4 4 5% 4 6% 9% 53%	2730
	21st to end	Night	4 7% 2 4 3 3 3 4 4 9% 55%	2873
December	1st to 10th	Night	3 4 2 5% 3 4 4 3 6% 7% 61%	4710
	11th to 20th	Night	2 7% 2 6% 4 4 5% 4 5% 8% 52%	5321
	21st to end	Night	5% 8% 3 7% 4 4 5% 4 6% 8% 45%	7128

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	31% 6% 14% 28% 19% 1	4723
	11th to 20th	Day	36% 7% 13% 25% 17% 3	4740
	21st to end	Day	28% 4 14% 28% 18% 6%	5405
February	1st to 10th	Day	40% 6% 15% 21% 15% 3	1890
	11th to 20th	Day	37% 7% 13% 23% 15% 5%	2044
	21st to end	Day	31% 5% 15% 26% 19% 5%	1730
March	1st to 10th	Day	32% 5% 8% 28% 24% 4	4600
	11th to 20th	Day	25% 6% 13% 28% 25% 3	4781
	21st to end	Day	36% 9% 15% 26% 13% 1	6098
April	1st to 10th	Day	34% 7% 16% 26% 13% 4	2520
	11th to 20th	Day	38% 7% 13% 19% 20% 4	2494
	21st to end	Day	37% 6% 13% 26% 15% 1	2612
May	1st to 10th	Day	31% 7% 14% 29% 16% 2	7689
	11th to 20th	Day	29% 8% 12% 26% 20% 5%	8195
	21st to end	Day	33% 8% 13% 27% 17% 2	9027
June	1st to 10th	Day	25% 9% 18% 29% 15% 4	2940
	11th to 20th	Day	27% 8% 13% 26% 20% 7%	2940
	21st to end	Day	22% 6% 11% 26% 25% 9%	2940
July	1st to 10th	Day	20% 6% 10% 25% 27% 12%	8181
	11th to 20th	Day	16% 5% 8% 28% 23% 19%	8175
	21st to end	Day	26% 7% 13% 19% 20% 15%	8759
August	1st to 10th	Day	26% 6% 13% 25% 22% 7%	4649
	11th to 20th	Day	24% 7% 12% 22% 24% 11%	4004
	21st to end	Day	22% 5% 10% 19% 25% 18%	4420
September	1st to 10th	Day	22% 5% 7% 23% 29% 14%	2400
	11th to 20th	Day	22% 3 9% 26% 27% 13%	2323
	21st to end	Day	20% 4 10% 28% 31% 7%	2200
October	1st to 10th	Day	17% 4 8% 17% 33% 21%	3412
	11th to 20th	Day	26% 5% 11% 30% 23% 6%	3250
	21st to end	Day	28% 4 11% 32% 20% 5%	3200
November	1st to 10th	Day	24% 6% 16% 27% 21% 7%	1853
	11th to 20th	Day	23% 5% 14% 30% 24% 4	1890
	21st to end	Day	26% 5% 15% 29% 22% 4	1743
December	1st to 10th	Day	22% 5% 16% 33% 21% 3	2700
	11th to 20th	Day	22% 5% 15% 37% 19% 2	3104
	21st to end	Day	33% 6% 10% 34% 16% 2	4092
January	1st to 10th	Night	35% 6% 11% 31% 14% 3	8202
	11th to 20th	Night	29% 6% 16% 26% 17% 5%	8250
	21st to end	Night	30% 5% 13% 29% 18% 4	8867
February	1st to 10th	Night	38% 8% 14% 24% 14% 2	2730
	11th to 20th	Night	38% 8% 14% 22% 14% 4	2471
	21st to end	Night	31% 7% 12% 28% 18% 4	2076
March	1st to 10th	Night	32% 5% 7% 25% 23% 7%	5494
	11th to 20th	Night	26% 5% 14% 23% 30% 2	5409
	21st to end	Night	39% 11% 18% 20% 12% 1	5096
April	1st to 10th	Night	35% 7% 16% 22% 17% 3	2100
	11th to 20th	Night	35% 8% 13% 24% 17% 4	2077
	21st to end	Night	41% 7% 13% 25% 14% 1	2006
May	1st to 10th	Night	35% 7% 13% 28% 16% 1	5243
	11th to 20th	Night	30% 8% 15% 30% 12% 5%	4702
	21st to end	Night	36% 10% 16% 28% 10% 1	5182
June	1st to 10th	Night	26% 11% 24% 24% 11% 3	1680
	11th to 20th	Night	26% 9% 18% 26% 16% 6%	1680
	21st to end	Night	23% 8% 16% 27% 20% 6%	1680
July	1st to 10th	Night	28% 7% 12% 25% 21% 6%	4700
	11th to 20th	Night	22% 6% 13% 27% 18% 14%	4692
	21st to end	Night	33% 9% 16% 19% 17% 6%	5038
August	1st to 10th	Night	32% 9% 15% 22% 18% 4	2704
	11th to 20th	Night	28% 9% 14% 22% 20% 6%	3338
	21st to end	Night	25% 7% 14% 20% 24% 10%	3687
September	1st to 10th	Night	23% 5% 9% 26% 27% 10%	2000
	11th to 20th	Night	22% 6% 12% 27% 24% 9%	2076
	21st to end	Night	25% 4 8% 28% 24% 10%	2200
October	1st to 10th	Night	17% 3 8% 18% 31% 23%	3771
	11th to 20th	Night	26% 5% 11% 31% 21% 6%	3898
	21st to end	Night	27% 5% 11% 30% 20% 8%	4568
November	1st to 10th	Night	26% 6% 13% 27% 22% 6%	2665
	11th to 20th	Night	26% 5% 13% 29% 21% 5%	2730
	21st to end	Night	28% 4 13% 30% 21% 5%	2873
December	1st to 10th	Night	22% 5% 16% 33% 21% 3	4710
	11th to 20th	Night	29% 5% 14% 37% 13% 2	5322
	21st to end	Night	35% 7% 11% 32% 13% 2	7128

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	8% 13% 38% 25% 14% 2	330
	11th to 20th	Day	12% 17% 38% 25% 7%	330
	21st to end	Day	9% 13% 47% 23% 5% 2	363
February	1st to 10th	Day	9% 16% 50% 18% 5% 1	330
	11th to 20th	Day	8% 16% 45% 25% 7%	330
	21st to end	Day	11% 19% 41% 25% 4	273
March	1st to 10th	Day	11% 16% 40% 22% 10% 1	330
	11th to 20th	Day	12% 15% 40% 23% 7% 2	393
	21st to end	Day	15% 16% 37% 22% 9% 1	594
April	1st to 10th	Day	15% 19% 35% 22% 9%	540
	11th to 20th	Day	17% 22% 34% 18% 8% 1	532
	21st to end	Day	17% 15% 29% 27% 11% 2	632
May	1st to 10th	Day	15% 12% 29% 28% 13% 3	753
	11th to 20th	Day	18% 9% 25% 29% 15% 5%	775
	21st to end	Day	16% 9% 30% 26% 16% 3	844
June	1st to 10th	Day	6% 6% 26% 33% 23% 6%	780
	11th to 20th	Day	8% 10% 34% 33% 13% 2	780
	21st to end	Day	8% 6% 28% 36% 20% 3	780
July	1st to 10th	Day	5% 4 21% 39% 26% 6%	771
	11th to 20th	Day	5% 4 22% 40% 25% 4	768
	21st to end	Day	6% 2 19% 40% 29% 4	849
August	1st to 10th	Day	6% 3 22% 41% 22% 6%	762
	11th to 20th	Day	5% 4 24% 34% 25% 8%	557
	21st to end	Day	5% 5% 24% 37% 23% 7%	620
September	1st to 10th	Day	6% 5% 25% 35% 22% 7%	530
	11th to 20th	Day	7% 8% 21% 34% 22% 9%	453
	21st to end	Day	8% 8% 28% 30% 17% 9%	330
October	1st to 10th	Day	11% 9% 27% 26% 18% 9%	330
	11th to 20th	Day	12% 13% 35% 21% 14% 5%	330
	21st to end	Day	10% 12% 39% 25% 11% 4	363
November	1st to 10th	Day	8% 12% 41% 24% 12% 3	330
	11th to 20th	Day	8% 11% 42% 25% 13% 1	330
	21st to end	Day	9% 9% 40% 29% 10% 2	330
December	1st to 10th	Day	8% 12% 48% 22% 7% 2	330
	11th to 20th	Day	12% 12% 46% 24% 6%	330
	21st to end	Day	12% 17% 43% 21% 6% 2	363
January	1st to 10th	Night	6% 14% 41% 29% 9% 1	1050
	11th to 20th	Night	7% 16% 43% 26% 7%	1050
	21st to end	Night	6% 12% 47% 30% 5%	1100
February	1st to 10th	Night	8% 13% 50% 24% 4	840
	11th to 20th	Night	10% 11% 44% 31% 5%	824
	21st to end	Night	8% 10% 51% 26% 5%	692
March	1st to 10th	Night	10% 11% 41% 31% 6%	840
	11th to 20th	Night	9% 8% 43% 33% 6% 1	840
	21st to end	Night	12% 12% 40% 31% 5%	695
April	1st to 10th	Night	14% 14% 39% 29% 5%	630
	11th to 20th	Night	13% 14% 42% 27% 4	623
	21st to end	Night	16% 13% 28% 33% 9%	630
May	1st to 10th	Night	16% 8% 33% 30% 12% 1	630
	11th to 20th	Night	16% 6% 33% 33% 11% 1	621
	21st to end	Night	15% 8% 37% 30% 9%	683
June	1st to 10th	Night	7% 5% 35% 37% 14% 1	630
	11th to 20th	Night	9% 6% 41% 38% 5% 1	630
	21st to end	Night	6% 6% 37% 40% 10% 1	630
July	1st to 10th	Night	7% 2 26% 49% 14% 1	615
	11th to 20th	Night	5% 3 29% 50% 13%	612
	21st to end	Night	5% 2 27% 49% 17%	690
August	1st to 10th	Night	6% 3 28% 50% 13%	627
	11th to 20th	Night	5% 2 28% 51% 14%	624
	21st to end	Night	4 3 30% 48% 15%	687
September	1st to 10th	Night	9% 5% 23% 46% 17% 1	600
	11th to 20th	Night	7% 5% 32% 40% 16% 2	600
	21st to end	Night	11% 5% 32% 42% 10%	600
October	1st to 10th	Night	13% 7% 30% 35% 13% 2	703
	11th to 20th	Night	11% 9% 33% 38% 10%	800
	21st to end	Night	9% 10% 38% 33% 9% 1	1070
November	1st to 10th	Night	9% 8% 40% 34% 8% 1	1025
	11th to 20th	Night	7% 12% 44% 31% 6% 1	1050
	21st to end	Night	7% 11% 42% 32% 8%	1050
December	1st to 10th	Night	7% 11% 50% 27% 5%	1050
	11th to 20th	Night	8% 11% 46% 32% 4	1050
	21st to end	Night	9% 15% 44% 27% 5%	1155

Page generated at 2026-08-27 02:07:13. Version ac07

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