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 2024-11-01.

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% 4 4 4 4 6% 8% 53%	101391
	Night	6% 6% 2 6% 4 4 4 4 6% 8% 51%	97779
Transparency	Day	28% 7% 14% 26% 19% 7%	101132
	Night	29% 8% 15% 26% 17% 5%	97628
Seeing	Day	10% 9% 31% 30% 16% 4	15804
	Night	9% 9% 38% 34% 9% 1	25754

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 8% 5% 4 4 4 6% 6% 52%	2538
	11th to 20th	Day	3 9% 4 8% 6% 4 5% 4 5% 8% 44%	2540
	21st to end	Day	3 6% 2 4 3 3 3 3 5% 6% 61%	2899
February	1st to 10th	Day	5% 11% 4 8% 6% 5% 5% 4 5% 7% 41%	1710
	11th to 20th	Day	4 9% 3 7% 5% 5% 5% 5% 5% 7% 45%	1834
	21st to end	Day	3 10% 3 6% 4 3 4 3 6% 7% 51%	1570
March	1st to 10th	Day	5% 9% 3 6% 3 3 4 3 6% 8% 51%	3130
	11th to 20th	Day	6% 6% 2 5% 3 3 3 3 5% 7% 57%	3266
	21st to end	Day	10% 9% 3 8% 5% 5% 5% 4 6% 7% 39%	4162
April	1st to 10th	Day	9% 9% 2 5% 3 4 4 3 6% 8% 46%	2280
	11th to 20th	Day	11% 8% 2 6% 4 5% 5% 4 6% 7% 41%	2251
	21st to end	Day	10% 8% 3 5% 4 4 4 4 6% 7% 44%	2363
May	1st to 10th	Day	14% 8% 3 6% 4 4 4 4 5% 7% 40%	4141
	11th to 20th	Day	10% 4 2 4 3 4 4 4 6% 9% 48%	4388
	21st to end	Day	10% 5% 2 6% 4 4 4 4 6% 8% 47%	4825
June	1st to 10th	Day	5% 3 1 4 4 4 5% 5% 7% 9% 53%	2660
	11th to 20th	Day	7% 4 2 5% 4 4 4 4 7% 9% 51%	2660
	21st to end	Day	5% 2 1 3 3 4 5% 4 5% 9% 58%	2660
July	1st to 10th	Day	5% 3 1 3 3 3 4 4 6% 8% 59%	4430
	11th to 20th	Day	3 2 1 3 3 4 5% 4 8% 9% 58%	4430
	21st to end	Day	3 2 1 3 3 4 5% 4 6% 9% 60%	4802
August	1st to 10th	Day	10% 3 1 4 4 3 4 4 6% 8% 53%	4386
	11th to 20th	Day	4 2 2 5% 3 4 5% 4 7% 8% 56%	3728
	21st to end	Day	4 3 1 4 3 3 3 3 6% 8% 61%	4180
September	1st to 10th	Day	5% 4 1 4 3 3 3 3 5% 6% 62%	2280
	11th to 20th	Day	7% 3 1 3 3 2 3 2 4 6% 65%	2207
	21st to end	Day	6% 4 2 4 2 2 2 2 4 7% 65%	2090
October	1st to 10th	Day	10% 5% 2 4 3 2 3 3 5% 6% 58%	1990
	11th to 20th	Day	7% 6% 1 4 3 3 3 3 4 6% 60%	1900
	21st to end	Day	7% 5% 2 4 2 2 3 3 5% 7% 59%	1891
November	1st to 10th	Day	3 5% 2 4 3 3 4 5% 6% 9% 56%	1673
	11th to 20th	Day	4 5% 2 5% 4 3 3 4 6% 8% 58%	1710
	21st to end	Day	4 6% 2 4 3 3 4 4 5% 6% 58%	1577
December	1st to 10th	Day	4 8% 2 6% 3 4 4 4 6% 7% 52%	1520
	11th to 20th	Day	4 5% 1 5% 4 3 3 3 6% 9% 57%	1926
	21st to end	Day	4 9% 4 8% 5% 4 4 3 4 6% 49%	2794
January	1st to 10th	Night	2 6% 3 9% 5% 4 4 3 6% 7% 51%	4417
	11th to 20th	Night	2 6% 3 8% 4 4 4 4 6% 9% 50%	4430
	21st to end	Night	2 4 2 5% 4 3 5% 4 5% 8% 58%	4798
February	1st to 10th	Night	4 10% 4 9% 5% 4 5% 4 6% 8% 41%	2470
	11th to 20th	Night	5% 8% 3 7% 5% 5% 5% 5% 6% 8% 43%	2231
	21st to end	Night	4 8% 3 7% 4 4 5% 4 5% 7% 49%	1884
March	1st to 10th	Night	4 11% 3 6% 3 4 4 3 4 6% 52%	3734
	11th to 20th	Night	5% 6% 3 6% 4 4 4 3 5% 7% 53%	3691
	21st to end	Night	8% 8% 3 8% 5% 5% 5% 4 7% 8% 38%	3479
April	1st to 10th	Night	10% 8% 3 6% 3 3 3 4 5% 8% 48%	1900
	11th to 20th	Night	10% 7% 3 7% 4 4 4 4 6% 7% 45%	1877
	21st to end	Night	13% 8% 2 7% 5% 4 4 3 6% 6% 42%	1815
May	1st to 10th	Night	12% 8% 3 7% 4 4 4 4 5% 7% 41%	2825
	11th to 20th	Night	9% 4 2 4 3 3 3 4 6% 9% 53%	2517
	21st to end	Night	12% 5% 2 5% 4 4 5% 4 7% 8% 45%	2762
June	1st to 10th	Night	5% 4 2 5% 5% 4 4 4 8% 11% 49%	1520
	11th to 20th	Night	8% 3 1 4 4 3 3 5% 7% 10% 51%	1520
	21st to end	Night	4 3 1 3 3 4 4 4 8% 10% 55%	1520
July	1st to 10th	Night	6% 3 2 5% 5% 4 5% 4 6% 7% 54%	2540
	11th to 20th	Night	2 2 2 4 3 4 5% 5% 7% 11% 54%	2540
	21st to end	Night	3 2 2 5% 5% 5% 5% 4 6% 9% 54%	2761
August	1st to 10th	Night	10% 4 2 5% 4 5% 5% 5% 7% 9% 45%	2550
	11th to 20th	Night	4 3 2 6% 5% 6% 6% 4 7% 9% 49%	3108
	21st to end	Night	4 3 1 5% 4 4 5% 4 6% 8% 55%	3487
September	1st to 10th	Night	7% 4 2 4 3 3 3 3 5% 7% 61%	1900
	11th to 20th	Night	6% 3 2 4 3 3 3 3 5% 6% 63%	1972
	21st to end	Night	8% 5% 1 4 3 3 3 3 4 5% 62%	2090
October	1st to 10th	Night	11% 5% 2 4 3 2 3 3 5% 6% 57%	2188
	11th to 20th	Night	9% 4 1 5% 4 3 3 3 4 5% 59%	2280
	21st to end	Night	8% 5% 2 5% 3 3 3 3 5% 7% 55%	2688
November	1st to 10th	Night	6% 6% 2 4 3 3 4 3 5% 8% 55%	2412
	11th to 20th	Night	4 4 2 6% 4 4 5% 4 6% 9% 52%	2470
	21st to end	Night	4 7% 3 4 3 3 3 4 5% 9% 55%	2599
December	1st to 10th	Night	5% 7% 2 6% 4 3 4 3 6% 8% 53%	2660
	11th to 20th	Night	3 7% 2 5% 4 3 4 3 5% 9% 56%	3271
	21st to end	Night	6% 9% 3 7% 4 4 4 4 6% 8% 47%	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	28% 8% 15% 28% 20% 1	2539
	11th to 20th	Day	36% 8% 16% 24% 15% 2	2540
	21st to end	Day	23% 5% 20% 33% 12% 6%	2899
February	1st to 10th	Day	42% 7% 15% 21% 14% 2	1710
	11th to 20th	Day	37% 7% 13% 23% 15% 5%	1844
	21st to end	Day	32% 5% 16% 25% 17% 5%	1570
March	1st to 10th	Day	29% 6% 11% 27% 24% 4	3130
	11th to 20th	Day	26% 7% 18% 32% 15% 2	3266
	21st to end	Day	39% 10% 15% 27% 8% 1	4162
April	1st to 10th	Day	35% 8% 16% 25% 13% 4	2280
	11th to 20th	Day	39% 7% 14% 19% 17% 3	2254
	21st to end	Day	37% 7% 13% 27% 15% 1	2363
May	1st to 10th	Day	38% 9% 16% 22% 12% 3	4141
	11th to 20th	Day	29% 9% 15% 31% 14% 2	4392
	21st to end	Day	32% 9% 15% 29% 12% 3	4825
June	1st to 10th	Day	24% 10% 19% 29% 15% 4	2660
	11th to 20th	Day	27% 8% 14% 25% 20% 6%	2660
	21st to end	Day	21% 7% 11% 27% 25% 9%	2660
July	1st to 10th	Day	21% 5% 11% 21% 30% 12%	4361
	11th to 20th	Day	17% 6% 12% 28% 23% 14%	4355
	21st to end	Day	18% 7% 9% 21% 24% 20%	4651
August	1st to 10th	Day	27% 6% 14% 25% 21% 7%	4371
	11th to 20th	Day	24% 7% 12% 22% 24% 11%	3764
	21st to end	Day	21% 5% 10% 19% 26% 19%	4179
September	1st to 10th	Day	23% 5% 7% 22% 29% 15%	2280
	11th to 20th	Day	20% 3 9% 26% 28% 13%	2207
	21st to end	Day	20% 4 11% 28% 31% 6%	2090
October	1st to 10th	Day	28% 6% 10% 23% 27% 7%	1990
	11th to 20th	Day	24% 6% 10% 29% 23% 7%	1900
	21st to end	Day	25% 5% 14% 31% 19% 6%	1891
November	1st to 10th	Day	23% 7% 16% 26% 20% 7%	1673
	11th to 20th	Day	24% 5% 14% 31% 23% 4	1710
	21st to end	Day	25% 5% 16% 28% 22% 4	1577
December	1st to 10th	Day	29% 7% 19% 24% 18% 3	1520
	11th to 20th	Day	24% 6% 15% 37% 17% 1	1924
	21st to end	Day	36% 6% 11% 29% 16% 2	2794
January	1st to 10th	Night	30% 7% 12% 33% 16% 1	4417
	11th to 20th	Night	29% 8% 21% 23% 17% 3	4430
	21st to end	Night	23% 8% 20% 33% 14% 2	4798
February	1st to 10th	Night	39% 8% 15% 24% 13% 2	2470
	11th to 20th	Night	37% 8% 15% 22% 14% 4	2231
	21st to end	Night	33% 7% 12% 27% 16% 4	1884
March	1st to 10th	Night	31% 7% 11% 26% 20% 5%	3734
	11th to 20th	Night	29% 7% 18% 27% 18% 2	3691
	21st to end	Night	37% 14% 18% 23% 8% 1	3479
April	1st to 10th	Night	35% 7% 16% 22% 17% 4	1900
	11th to 20th	Night	35% 8% 14% 24% 15% 3	1877
	21st to end	Night	40% 7% 12% 26% 13% 1	1815
May	1st to 10th	Night	38% 9% 16% 21% 13% 2	2825
	11th to 20th	Night	24% 11% 19% 34% 9% 3	2518
	21st to end	Night	31% 13% 18% 26% 10% 2	2762
June	1st to 10th	Night	26% 11% 25% 24% 11% 3	1520
	11th to 20th	Night	27% 9% 18% 27% 15% 6%	1520
	21st to end	Night	20% 8% 16% 28% 21% 6%	1520
July	1st to 10th	Night	28% 7% 10% 25% 22% 8%	2500
	11th to 20th	Night	21% 8% 18% 26% 21% 8%	2492
	21st to end	Night	24% 8% 15% 23% 21% 10%	2674
August	1st to 10th	Night	33% 9% 15% 21% 18% 4	2542
	11th to 20th	Night	28% 10% 14% 21% 21% 6%	3138
	21st to end	Night	24% 7% 13% 20% 25% 11%	3487
September	1st to 10th	Night	24% 5% 9% 25% 27% 11%	1900
	11th to 20th	Night	20% 6% 12% 28% 24% 10%	1972
	21st to end	Night	25% 4 8% 28% 24% 10%	2090
October	1st to 10th	Night	28% 5% 13% 21% 25% 7%	2188
	11th to 20th	Night	28% 5% 10% 28% 20% 9%	2280
	21st to end	Night	28% 6% 14% 26% 19% 8%	2688
November	1st to 10th	Night	26% 6% 14% 26% 22% 6%	2412
	11th to 20th	Night	27% 6% 13% 29% 20% 5%	2470
	21st to end	Night	28% 4 13% 29% 21% 5%	2599
December	1st to 10th	Night	29% 6% 15% 28% 19% 4	2660
	11th to 20th	Night	26% 6% 16% 36% 15% 2	3272
	21st to end	Night	34% 7% 13% 30% 13% 3	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	8% 10% 37% 27% 16% 3	270
	11th to 20th	Day	11% 17% 35% 29% 9%	270
	21st to end	Day	9% 12% 47% 23% 6% 3	297
February	1st to 10th	Day	11% 15% 51% 17% 5% 1	270
	11th to 20th	Day	8% 17% 45% 23% 6%	270
	21st to end	Day	11% 18% 42% 25% 4	225
March	1st to 10th	Day	10% 14% 43% 24% 9% 1	270
	11th to 20th	Day	13% 11% 40% 26% 8% 2	327
	21st to end	Day	16% 14% 36% 23% 9% 1	506
April	1st to 10th	Day	17% 18% 34% 22% 9%	460
	11th to 20th	Day	18% 20% 35% 18% 7% 1	452
	21st to end	Day	16% 15% 28% 28% 11% 2	543
May	1st to 10th	Day	17% 12% 29% 27% 13% 2	653
	11th to 20th	Day	19% 7% 24% 29% 17% 5%	675
	21st to end	Day	16% 10% 29% 27% 16% 3	734
June	1st to 10th	Day	5% 5% 25% 34% 24% 6%	680
	11th to 20th	Day	9% 9% 34% 33% 13% 3	680
	21st to end	Day	7% 5% 27% 38% 21% 3	680
July	1st to 10th	Day	5% 4 20% 38% 26% 6%	671
	11th to 20th	Day	5% 4 24% 39% 25% 4	668
	21st to end	Day	6% 2 18% 40% 30% 4	739
August	1st to 10th	Day	7% 2 22% 40% 24% 6%	664
	11th to 20th	Day	5% 4 25% 34% 25% 7%	477
	21st to end	Day	5% 5% 23% 36% 24% 7%	539
September	1st to 10th	Day	6% 5% 24% 36% 22% 7%	490
	11th to 20th	Day	6% 8% 21% 33% 22% 9%	417
	21st to end	Day	8% 8% 28% 32% 15% 9%	300
October	1st to 10th	Day	11% 9% 25% 27% 18% 9%	300
	11th to 20th	Day	11% 12% 35% 22% 15% 5%	300
	21st to end	Day	10% 12% 38% 26% 10% 4	330
November	1st to 10th	Day	7% 11% 40% 25% 13% 4	270
	11th to 20th	Day	9% 11% 40% 26% 13% 1	270
	21st to end	Day	9% 9% 44% 28% 7% 3	270
December	1st to 10th	Day	9% 11% 49% 22% 7% 2	270
	11th to 20th	Day	11% 10% 47% 25% 7%	270
	21st to end	Day	12% 16% 41% 22% 6% 2	297
January	1st to 10th	Night	6% 14% 40% 29% 10% 1	950
	11th to 20th	Night	7% 15% 42% 28% 8% 1	950
	21st to end	Night	7% 12% 47% 29% 6%	996
February	1st to 10th	Night	8% 12% 49% 26% 4	760
	11th to 20th	Night	9% 11% 44% 30% 5% 1	744
	21st to end	Night	9% 11% 50% 25% 5%	628
March	1st to 10th	Night	10% 11% 42% 31% 6%	760
	11th to 20th	Night	8% 8% 42% 34% 7% 1	760
	21st to end	Night	12% 10% 40% 32% 5%	629
April	1st to 10th	Night	15% 14% 38% 29% 5%	570
	11th to 20th	Night	13% 15% 41% 27% 4	563
	21st to end	Night	15% 14% 28% 33% 10%	570
May	1st to 10th	Night	17% 8% 33% 28% 12% 1	570
	11th to 20th	Night	17% 5% 31% 34% 12% 1	561
	21st to end	Night	15% 7% 38% 30% 10%	617
June	1st to 10th	Night	7% 5% 34% 38% 15% 1	570
	11th to 20th	Night	9% 6% 40% 39% 5% 1	570
	21st to end	Night	4 6% 36% 43% 11% 1	570
July	1st to 10th	Night	7% 2 26% 48% 15% 1	555
	11th to 20th	Night	4 3 30% 49% 14%	552
	21st to end	Night	4 1 25% 50% 18%	624
August	1st to 10th	Night	6% 2 25% 52% 14%	567
	11th to 20th	Night	4 2 29% 52% 13%	564
	21st to end	Night	4 3 29% 48% 15%	627
September	1st to 10th	Night	9% 5% 23% 45% 18% 1	570
	11th to 20th	Night	6% 5% 32% 39% 16% 2	570
	21st to end	Night	12% 5% 32% 41% 10%	570
October	1st to 10th	Night	14% 7% 30% 33% 14% 2	668
	11th to 20th	Night	11% 8% 32% 38% 10%	760
	21st to end	Night	10% 10% 38% 33% 9% 1	1016
November	1st to 10th	Night	9% 7% 39% 36% 9% 1	928
	11th to 20th	Night	7% 12% 44% 30% 6% 1	950
	21st to end	Night	7% 11% 41% 32% 8%	950
December	1st to 10th	Night	8% 11% 50% 27% 5%	950
	11th to 20th	Night	8% 10% 45% 33% 5%	950
	21st to end	Night	10% 16% 43% 27% 5%	1045

Page generated at 2024-10-29 09:20:46. Version ac07

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