Rose Valley Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Rose Valley Campground clear sky chart from 2005-11-06 to 2024-12-24.

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 3 1 2 2 2 2 2 4 5% 73%	105228
	Night	4 3 1 2 2 2 2 2 4 5% 73%	103651
Transparency	Day	15% 5% 6% 17% 28% 30%	104985
	Night	15% 4 5% 16% 28% 31%	103483
Seeing	Day	6% 11% 28% 36% 15% 4	15727
	Night	5% 4 19% 34% 30% 7%	25506

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	6% 2 1 4 2 2 2 2 4 6% 68%	2575
	11th to 20th	Day	8% 4 2 4 2 2 3 2 5% 9% 59%	2860
	21st to end	Day	11% 5% 1 4 3 3 4 4 5% 8% 52%	3238
February	1st to 10th	Day	10% 5% 2 3 3 2 2 3 4 4 61%	1900
	11th to 20th	Day	8% 4 1 3 3 2 3 3 5% 8% 60%	1850
	21st to end	Day	9% 5% 2 5% 3 3 3 2 5% 5% 58%	1570
March	1st to 10th	Day	11% 6% 2 6% 3 3 4 3 4 6% 52%	3138
	11th to 20th	Day	5% 3 2 4 3 3 3 2 5% 7% 64%	3387
	21st to end	Day	6% 6% 2 5% 3 4 5% 4 7% 8% 50%	4121
April	1st to 10th	Day	7% 4 1 3 3 3 2 2 5% 8% 62%	2280
	11th to 20th	Day	4 4 1 3 2 2 3 2 4 6% 68%	2249
	21st to end	Day	4 3 1 2 2 2 3 3 5% 6% 70%	2280
May	1st to 10th	Day	3 2 1 2 2 2 2 2 3 4 77%	3800
	11th to 20th	Day	1 1 1 1 2 2 4 6% 10% 71%	4057
	21st to end	Day	2 2 1 2 2 2 2 4 5% 8% 71%	4493
June	1st to 10th	Day	3 2 1 2 2 2 2 3 4 7% 73%	2660
	11th to 20th	Day	1 1 1 2 2 1 2 2 4 83%	2660
	21st to end	Day	1 1 1 1 1 2 1 2 3 86%	2660
July	1st to 10th	Day	1 1 1 1 1 1 2 2 91%	4420
	11th to 20th	Day	2 1 1 2 2 2 2 2 3 3 82%	4310
	21st to end	Day	1 1 1 1 1 2 1 2 3 87%	4313
August	1st to 10th	Day	1 1 1 1 1 2 1 2 3 86%	3783
	11th to 20th	Day	1 1 1 1 1 1 2 93%	3724
	21st to end	Day	1 1 1 1 1 1 1 2 91%	4180
September	1st to 10th	Day	1 1 1 1 1 2 2 2 5% 84%	2280
	11th to 20th	Day	1 1 1 1 1 1 2 3 5% 85%	2199
	21st to end	Day	1 1 1 1 1 2 2 1 2 3 85%	2090
October	1st to 10th	Day	2 1 1 1 1 1 2 3 4 82%	3415
	11th to 20th	Day	2 1 2 2 2 2 1 3 4 81%	3161
	21st to end	Day	3 2 1 3 2 2 3 2 3 5% 72%	3448
November	1st to 10th	Day	3 3 2 2 2 3 2 3 5% 75%	1791
	11th to 20th	Day	4 3 1 2 2 2 2 3 5% 6% 71%	1800
	21st to end	Day	4 3 2 5% 3 4 3 4 4 7% 61%	1800
December	1st to 10th	Day	6% 4 1 5% 3 3 3 3 4 7% 60%	1800
	11th to 20th	Day	17% 6% 2 4 3 3 4 3 6% 7% 46%	2118
	21st to end	Day	10% 6% 2 6% 4 4 4 4 5% 7% 48%	2818
January	1st to 10th	Night	7% 4 1 3 3 3 3 2 4 5% 66%	4369
	11th to 20th	Night	7% 4 2 4 3 3 4 3 5% 8% 58%	4110
	21st to end	Night	11% 5% 2 3 2 3 3 3 5% 7% 56%	4428
February	1st to 10th	Night	9% 5% 2 4 3 1 2 2 4 5% 62%	2280
	11th to 20th	Night	8% 3 1 3 2 3 2 3 4 5% 65%	2218
	21st to end	Night	9% 4 1 4 3 3 3 2 4 6% 61%	1884
March	1st to 10th	Night	8% 6% 2 4 3 3 4 4 5% 9% 53%	3736
	11th to 20th	Night	3 3 1 3 2 2 3 3 5% 7% 69%	3589
	21st to end	Night	9% 4 1 2 2 2 2 3 5% 7% 62%	3530
April	1st to 10th	Night	6% 3 2 3 2 2 3 2 5% 7% 65%	1900
	11th to 20th	Night	3 3 1 2 2 2 2 4 4 5% 73%	1879
	21st to end	Night	2 3 1 1 1 2 3 3 4 7% 73%	1900
May	1st to 10th	Night	1 2 1 2 2 1 2 2 3 3 82%	3180
	11th to 20th	Night	1 1 2 1 1 2 5% 4 6% 76%	2846
	21st to end	Night	1 1 1 2 1 1 2 4 4 5% 79%	3088
June	1st to 10th	Night	2 1 1 2 2 2 2 3 3 6% 78%	1520
	11th to 20th	Night	2 1 1 1 1 1 2 3 3 86%	1520
	21st to end	Night	1 1 1 1 1 2 3 90%	1520
July	1st to 10th	Night	1 1 1 1 1 1 1 2 92%	2540
	11th to 20th	Night	1 1 1 1 1 2 1 3 3 86%	2636
	21st to end	Night	1 1 1 1 1 1 1 2 2 89%	3252
August	1st to 10th	Night	1 2 2 1 1 1 1 2 3 87%	3166
	11th to 20th	Night	1 1 1 1 1 1 2 92%	3126
	21st to end	Night	1 1 1 1 1 1 2 93%	3498
September	1st to 10th	Night	2 1 1 1 1 1 1 1 2 89%	1900
	11th to 20th	Night	1 1 2 1 1 2 1 2 2 87%	1981
	21st to end	Night	1 1 1 1 1 1 1 2 3 2 86%	2090
October	1st to 10th	Night	1 1 1 1 1 1 1 2 3 87%	3549
	11th to 20th	Night	1 1 1 1 1 1 2 2 3 5% 81%	3777
	21st to end	Night	3 3 1 2 1 1 2 2 2 4 80%	4121
November	1st to 10th	Night	2 2 1 2 2 2 3 2 4 6% 74%	2506
	11th to 20th	Night	3 3 1 3 2 2 3 2 4 5% 73%	2600
	21st to end	Night	5% 4 1 3 3 3 3 3 4 6% 64%	2600
December	1st to 10th	Night	7% 4 1 4 3 2 3 3 5% 6% 63%	2600
	11th to 20th	Night	19% 6% 2 3 3 3 3 4 5% 7% 46%	3302
	21st to end	Night	11% 4 2 5% 4 5% 5% 4 6% 7% 49%	4910

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	18% 3 6% 27% 35% 12%	2575
	11th to 20th	Day	24% 6% 15% 21% 20% 14%	2860
	21st to end	Day	29% 6% 6% 23% 23% 13%	3238
February	1st to 10th	Day	26% 2 5% 16% 25% 26%	1900
	11th to 20th	Day	23% 3 7% 17% 30% 20%	1860
	21st to end	Day	28% 4 7% 18% 26% 16%	1570
March	1st to 10th	Day	31% 8% 9% 22% 17% 13%	3138
	11th to 20th	Day	18% 6% 14% 31% 17% 15%	3387
	21st to end	Day	27% 10% 13% 27% 18% 6%	4121
April	1st to 10th	Day	23% 6% 10% 24% 25% 12%	2280
	11th to 20th	Day	19% 5% 8% 25% 30% 12%	2252
	21st to end	Day	15% 7% 9% 24% 36% 10%	2280
May	1st to 10th	Day	13% 5% 7% 21% 36% 18%	3800
	11th to 20th	Day	9% 16% 7% 24% 34% 10%	4060
	21st to end	Day	9% 16% 5% 28% 35% 7%	4493
June	1st to 10th	Day	14% 8% 9% 20% 31% 17%	2660
	11th to 20th	Day	8% 6% 7% 13% 35% 31%	2660
	21st to end	Day	7% 3 4 8% 35% 44%	2660
July	1st to 10th	Day	4 2 3 5% 15% 73%	4351
	11th to 20th	Day	9% 3 3 10% 21% 54%	4235
	21st to end	Day	6% 2 4 17% 29% 42%	4177
August	1st to 10th	Day	7% 3 2 10% 37% 42%	3770
	11th to 20th	Day	3 2 1 8% 28% 58%	3760
	21st to end	Day	4 1 2 9% 27% 57%	4179
September	1st to 10th	Day	7% 3 5% 9% 29% 47%	2280
	11th to 20th	Day	5% 4 5% 12% 32% 42%	2199
	21st to end	Day	8% 3 3 12% 37% 37%	2090
October	1st to 10th	Day	8% 2 3 10% 20% 56%	3415
	11th to 20th	Day	11% 3 2 14% 38% 32%	3161
	21st to end	Day	16% 4 3 9% 31% 36%	3448
November	1st to 10th	Day	14% 2 4 17% 34% 29%	1791
	11th to 20th	Day	16% 2 7% 13% 28% 34%	1800
	21st to end	Day	22% 4 7% 14% 23% 30%	1800
December	1st to 10th	Day	25% 4 6% 14% 26% 25%	1800
	11th to 20th	Day	37% 6% 6% 16% 22% 14%	2117
	21st to end	Day	34% 6% 8% 22% 19% 11%	2818
January	1st to 10th	Night	22% 4 5% 15% 39% 16%	4369
	11th to 20th	Night	25% 7% 10% 24% 19% 15%	4110
	21st to end	Night	28% 6% 6% 17% 27% 16%	4428
February	1st to 10th	Night	25% 2 6% 16% 23% 28%	2280
	11th to 20th	Night	21% 3 6% 18% 28% 25%	2219
	21st to end	Night	26% 4 8% 17% 25% 20%	1884
March	1st to 10th	Night	25% 10% 7% 21% 25% 12%	3736
	11th to 20th	Night	14% 7% 10% 30% 21% 17%	3589
	21st to end	Night	23% 6% 10% 27% 26% 9%	3530
April	1st to 10th	Night	20% 6% 10% 25% 24% 15%	1900
	11th to 20th	Night	14% 6% 9% 22% 31% 18%	1879
	21st to end	Night	13% 7% 7% 23% 40% 11%	1900
May	1st to 10th	Night	10% 6% 5% 17% 37% 24%	3180
	11th to 20th	Night	8% 8% 5% 28% 32% 18%	2847
	21st to end	Night	6% 9% 6% 28% 43% 7%	3088
June	1st to 10th	Night	11% 5% 9% 23% 34% 18%	1520
	11th to 20th	Night	6% 4 5% 14% 34% 36%	1520
	21st to end	Night	4 2 3 11% 31% 50%	1520
July	1st to 10th	Night	4 1 2 5% 14% 75%	2500
	11th to 20th	Night	6% 2 3 10% 19% 61%	2588
	21st to end	Night	5% 2 3 14% 28% 48%	3150
August	1st to 10th	Night	6% 2 1 9% 36% 46%	3156
	11th to 20th	Night	3 1 1 5% 26% 62%	3156
	21st to end	Night	3 1 1 5% 30% 60%	3498
September	1st to 10th	Night	6% 3 3 6% 28% 54%	1900
	11th to 20th	Night	8% 2 2 9% 36% 44%	1981
	21st to end	Night	6% 2 3 10% 37% 42%	2090
October	1st to 10th	Night	7% 1 2 8% 19% 62%	3549
	11th to 20th	Night	7% 4 2 11% 34% 42%	3777
	21st to end	Night	11% 3 2 7% 29% 48%	4121
November	1st to 10th	Night	14% 3 3 14% 33% 32%	2506
	11th to 20th	Night	16% 2 7% 12% 26% 37%	2600
	21st to end	Night	21% 4 6% 16% 20% 33%	2600
December	1st to 10th	Night	23% 4 6% 14% 23% 31%	2600
	11th to 20th	Night	37% 5% 7% 13% 22% 17%	3302
	21st to end	Night	32% 8% 7% 20% 22% 11%	4910

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	16% 17% 33% 23% 9% 1	203
	11th to 20th	Day	15% 15% 32% 29% 8% 1	370
	21st to end	Day	12% 20% 38% 22% 7% 2	432
February	1st to 10th	Day	13% 17% 35% 25% 7% 3	460
	11th to 20th	Day	12% 20% 33% 26% 8% 1	455
	21st to end	Day	15% 19% 37% 23% 6% 1	382
March	1st to 10th	Day	17% 21% 35% 20% 7%	460
	11th to 20th	Day	14% 19% 34% 25% 7% 1	460
	21st to end	Day	12% 22% 35% 25% 5% 1	506
April	1st to 10th	Day	12% 15% 34% 27% 11% 2	460
	11th to 20th	Day	8% 20% 33% 29% 8% 2	452
	21st to end	Day	7% 13% 35% 28% 12% 5%	460
May	1st to 10th	Day	9% 14% 33% 31% 10% 3	463
	11th to 20th	Day	6% 13% 29% 35% 14% 3	488
	21st to end	Day	7% 12% 31% 32% 15% 4	529
June	1st to 10th	Day	3 8% 25% 38% 21% 6%	490
	11th to 20th	Day	1 5% 26% 42% 18% 6%	490
	21st to end	Day	1 4 24% 43% 20% 8%	490
July	1st to 10th	Day	1 14% 48% 28% 9%	486
	11th to 20th	Day	1 1 11% 44% 30% 14%	484
	21st to end	Day	1 1 13% 46% 28% 12%	531
August	1st to 10th	Day	1 1 17% 50% 21% 10%	487
	11th to 20th	Day	1 2 14% 47% 25% 10%	477
	21st to end	Day	1 1 17% 50% 23% 7%	539
September	1st to 10th	Day	1 2 24% 46% 20% 6%	490
	11th to 20th	Day	1 8% 28% 44% 16% 3	490
	21st to end	Day	1 7% 26% 44% 20% 3	490
October	1st to 10th	Day	3 8% 30% 42% 16% 1	490
	11th to 20th	Day	3 7% 36% 37% 15% 2	490
	21st to end	Day	5% 10% 30% 37% 15% 3	539
November	1st to 10th	Day	6% 9% 28% 38% 17% 2	327
	11th to 20th	Day	6% 13% 31% 31% 15% 2	300
	21st to end	Day	8% 15% 30% 32% 12% 3	300
December	1st to 10th	Day	6% 14% 32% 34% 13% 2	300
	11th to 20th	Day	9% 14% 29% 30% 14% 4	253
	21st to end	Day	13% 24% 27% 24% 9% 3	204
January	1st to 10th	Night	13% 6% 23% 36% 15% 7%	760
	11th to 20th	Night	7% 6% 28% 39% 17% 4	760
	21st to end	Night	12% 9% 30% 33% 13% 3	836
February	1st to 10th	Night	11% 9% 25% 32% 18% 5%	760
	11th to 20th	Night	9% 5% 26% 35% 18% 6%	744
	21st to end	Night	11% 8% 28% 36% 14% 3	628
March	1st to 10th	Night	10% 6% 28% 36% 18% 2	760
	11th to 20th	Night	7% 7% 23% 38% 21% 4	760
	21st to end	Night	8% 7% 25% 39% 18% 3	836
April	1st to 10th	Night	6% 5% 26% 38% 21% 4	760
	11th to 20th	Night	5% 6% 26% 37% 23% 3	751
	21st to end	Night	4 5% 26% 36% 23% 6%	760
May	1st to 10th	Night	4 4 25% 37% 27% 4	760
	11th to 20th	Night	2 5% 17% 36% 36% 4	573
	21st to end	Night	2 4 20% 38% 32% 4	608
June	1st to 10th	Night	2 1 12% 37% 43% 6%	380
	11th to 20th	Night	1 12% 36% 44% 7%	380
	21st to end	Night	1 8% 36% 47% 8%	380
July	1st to 10th	Night	1 1 2 28% 57% 11%	370
	11th to 20th	Night	1 1 3 16% 61% 17%	425
	21st to end	Night	2 3 20% 57% 18%	705
August	1st to 10th	Night	1 1 4 28% 56% 10%	756
	11th to 20th	Night	1 5% 20% 60% 14%	752
	21st to end	Night	2 3 23% 57% 15%	836
September	1st to 10th	Night	2 1 7% 29% 47% 14%	760
	11th to 20th	Night	1 2 9% 39% 39% 10%	760
	21st to end	Night	1 1 15% 35% 39% 9%	760
October	1st to 10th	Night	3 2 15% 44% 33% 4	760
	11th to 20th	Night	3 3 19% 41% 28% 7%	760
	21st to end	Night	4 5% 19% 34% 28% 9%	836
November	1st to 10th	Night	3 6% 21% 38% 24% 8%	780
	11th to 20th	Night	5% 5% 21% 39% 24% 7%	800
	21st to end	Night	7% 6% 28% 33% 22% 5%	800
December	1st to 10th	Night	9% 8% 23% 36% 21% 4	800
	11th to 20th	Night	12% 6% 27% 36% 15% 3	800
	21st to end	Night	11% 6% 28% 36% 14% 5%	850

Page generated at 2024-12-21 01:13:48. Version ac07

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