ROBOsky.com Wild Flower Ridge Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the ROBOsky.com Wild Flower Ridge Observatory clear sky chart from 2005-11-06 to 2024-11-04.

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	14% 11% 4 9% 6% 5% 5% 4 6% 7% 30%	101993
	Night	14% 11% 4 9% 6% 5% 5% 4 5% 6% 32%	96991
Transparency	Day	50% 8% 12% 19% 10% 1	105596
	Night	48% 9% 12% 19% 10% 1	101479
Seeing	Day	20% 19% 31% 18% 8% 3	14858
	Night	19% 18% 32% 22% 8% 1	23805

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	14% 16% 7% 14% 7% 5% 4 3 4 5% 20%	2517
	11th to 20th	Day	10% 20% 9% 19% 10% 8% 5% 3 4 5% 8%	2786
	21st to end	Day	19% 21% 7% 13% 6% 5% 4 3 4 4 14%	3124
February	1st to 10th	Day	12% 17% 5% 14% 10% 6% 5% 4 4 5% 17%	1710
	11th to 20th	Day	11% 13% 7% 15% 9% 4 5% 4 6% 6% 20%	1663
	21st to end	Day	15% 17% 5% 11% 6% 4 5% 4 6% 5% 22%	1475
March	1st to 10th	Day	15% 15% 5% 10% 6% 5% 4 3 4 5% 27%	3424
	11th to 20th	Day	10% 16% 7% 12% 7% 5% 5% 3 5% 5% 27%	3480
	21st to end	Day	14% 12% 4 8% 5% 5% 4 3 5% 5% 34%	3815
April	1st to 10th	Day	15% 16% 5% 9% 6% 4 4 3 5% 6% 28%	2223
	11th to 20th	Day	17% 11% 4 7% 4 4 4 3 6% 5% 35%	2363
	21st to end	Day	20% 10% 4 8% 4 4 3 3 6% 6% 33%	2470
May	1st to 10th	Day	17% 9% 3 7% 4 4 4 4 5% 7% 35%	4108
	11th to 20th	Day	16% 10% 3 7% 5% 4 6% 4 6% 7% 31%	4329
	21st to end	Day	12% 5% 2 6% 5% 4 4 4 6% 8% 45%	4837
June	1st to 10th	Day	15% 6% 2 7% 5% 4 4 5% 7% 9% 35%	2660
	11th to 20th	Day	12% 6% 2 6% 5% 5% 5% 4 7% 9% 39%	2764
	21st to end	Day	14% 6% 2 6% 5% 5% 5% 4 6% 10% 38%	2850
July	1st to 10th	Day	11% 5% 2 7% 6% 6% 6% 5% 7% 9% 35%	4714
	11th to 20th	Day	10% 5% 2 6% 4 5% 6% 5% 7% 9% 41%	4426
	21st to end	Day	9% 6% 2 7% 5% 6% 6% 5% 7% 9% 39%	4466
August	1st to 10th	Day	15% 7% 3 7% 4 5% 5% 5% 7% 8% 35%	4104
	11th to 20th	Day	12% 7% 4 9% 6% 6% 6% 5% 7% 8% 32%	4044
	21st to end	Day	10% 7% 3 6% 5% 5% 6% 4 6% 9% 39%	4404
September	1st to 10th	Day	14% 7% 3 7% 5% 5% 5% 4 6% 7% 39%	2280
	11th to 20th	Day	12% 7% 2 6% 5% 5% 5% 3 5% 8% 42%	2136
	21st to end	Day	15% 7% 3 8% 7% 5% 5% 4 6% 7% 32%	2071
October	1st to 10th	Day	18% 10% 3 8% 4 6% 4 4 5% 6% 32%	1900
	11th to 20th	Day	18% 13% 4 10% 5% 4 4 3 5% 5% 27%	1900
	21st to end	Day	25% 17% 4 8% 5% 4 4 4 4 6% 20%	2090
November	1st to 10th	Day	11% 16% 4 10% 5% 5% 4 4 5% 8% 28%	1622
	11th to 20th	Day	11% 15% 5% 12% 6% 6% 6% 5% 5% 7% 22%	1520
	21st to end	Day	15% 18% 6% 11% 7% 5% 5% 4 5% 7% 16%	1520
December	1st to 10th	Day	13% 21% 8% 15% 8% 5% 5% 4 6% 5% 12%	1520
	11th to 20th	Day	16% 19% 6% 12% 6% 5% 5% 3 5% 6% 16%	1906
	21st to end	Day	23% 22% 8% 16% 6% 4 4 3 4 3 8%	2772
January	1st to 10th	Night	15% 15% 8% 15% 7% 5% 5% 4 4 5% 18%	4429
	11th to 20th	Night	12% 13% 8% 17% 12% 10% 6% 4 4 4 10%	4170
	21st to end	Night	18% 14% 7% 13% 8% 6% 5% 4 5% 6% 13%	4532
February	1st to 10th	Night	12% 15% 5% 13% 8% 5% 5% 4 6% 6% 21%	2470
	11th to 20th	Night	10% 13% 5% 13% 8% 8% 6% 4 6% 6% 23%	2403
	21st to end	Night	11% 13% 4 11% 7% 6% 5% 5% 5% 7% 26%	1975
March	1st to 10th	Night	14% 12% 6% 9% 5% 5% 4 4 6% 7% 28%	3415
	11th to 20th	Night	11% 11% 5% 9% 5% 4 4 3 5% 7% 35%	3479
	21st to end	Night	14% 9% 3 8% 5% 4 4 3 5% 6% 40%	3817
April	1st to 10th	Night	17% 14% 3 8% 5% 4 4 3 4 6% 31%	1956
	11th to 20th	Night	16% 10% 2 5% 5% 4 5% 4 5% 7% 37%	1782
	21st to end	Night	15% 11% 4 7% 5% 4 4 4 5% 6% 34%	1710
May	1st to 10th	Night	15% 9% 3 6% 4 4 5% 4 5% 6% 40%	2833
	11th to 20th	Night	16% 8% 2 6% 4 4 4 4 6% 8% 39%	2561
	21st to end	Night	9% 5% 2 6% 3 3 4 3 6% 8% 51%	2738
June	1st to 10th	Night	12% 6% 2 6% 4 5% 5% 4 5% 9% 41%	1520
	11th to 20th	Night	8% 5% 2 6% 5% 4 6% 4 7% 9% 43%	1409
	21st to end	Night	11% 6% 2 5% 4 4 4 4 5% 7% 48%	1330
July	1st to 10th	Night	5% 5% 2 6% 4 4 5% 4 5% 8% 51%	2236
	11th to 20th	Night	10% 4 1 4 5% 4 4 3 5% 7% 52%	2520
	21st to end	Night	6% 5% 2 5% 4 4 4 5% 6% 8% 51%	3083
August	1st to 10th	Night	11% 5% 2 6% 3 4 4 4 6% 7% 49%	2825
	11th to 20th	Night	12% 5% 2 5% 3 4 5% 3 5% 8% 48%	2785
	21st to end	Night	11% 6% 1 6% 4 4 5% 3 5% 7% 49%	3219
September	1st to 10th	Night	8% 5% 3 6% 4 4 4 4 7% 7% 49%	1900
	11th to 20th	Night	10% 4 2 5% 3 3 3 3 6% 6% 54%	2042
	21st to end	Night	15% 8% 3 7% 4 4 3 3 5% 7% 41%	2109
October	1st to 10th	Night	16% 8% 2 8% 5% 4 5% 3 5% 6% 38%	2280
	11th to 20th	Night	17% 11% 4 7% 5% 4 5% 3 5% 5% 34%	2280
	21st to end	Night	19% 12% 3 8% 6% 4 5% 4 6% 7% 25%	2508
November	1st to 10th	Night	14% 11% 3 7% 5% 5% 5% 5% 6% 6% 33%	2523
	11th to 20th	Night	14% 13% 4 10% 5% 5% 5% 4 6% 8% 26%	2660
	21st to end	Night	14% 16% 5% 10% 7% 4 5% 4 6% 6% 22%	2660
December	1st to 10th	Night	17% 16% 6% 11% 6% 7% 5% 5% 5% 6% 16%	2660
	11th to 20th	Night	13% 18% 6% 13% 8% 5% 5% 4 5% 5% 16%	3288
	21st to end	Night	24% 21% 7% 15% 6% 4 4 3 4 4 8%	4884

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	62% 10% 13% 11% 4	2518
	11th to 20th	Day	74% 10% 7% 6% 3	2786
	21st to end	Day	72% 8% 10% 7% 3	3124
February	1st to 10th	Day	68% 8% 8% 12% 3 1	1710
	11th to 20th	Day	61% 9% 11% 12% 5% 1	1672
	21st to end	Day	61% 8% 10% 13% 7% 1	1475
March	1st to 10th	Day	56% 9% 12% 15% 8%	3427
	11th to 20th	Day	55% 8% 10% 19% 7% 1	3480
	21st to end	Day	47% 9% 12% 18% 12% 2	3815
April	1st to 10th	Day	56% 7% 10% 17% 9% 1	2223
	11th to 20th	Day	49% 6% 10% 21% 14% 1	2363
	21st to end	Day	51% 7% 10% 18% 11% 2	2470
May	1st to 10th	Day	44% 9% 13% 20% 13% 1	4120
	11th to 20th	Day	46% 12% 14% 19% 8% 1	4333
	21st to end	Day	35% 9% 14% 21% 18% 3	4837
June	1st to 10th	Day	42% 9% 13% 20% 14% 1	2660
	11th to 20th	Day	37% 9% 13% 24% 16% 1	2764
	21st to end	Day	41% 8% 14% 23% 13% 1	2850
July	1st to 10th	Day	41% 8% 16% 19% 15% 1	4641
	11th to 20th	Day	35% 8% 13% 33% 11% 1	4351
	21st to end	Day	38% 9% 13% 22% 16% 1	4324
August	1st to 10th	Day	44% 8% 14% 23% 11% 1	4091
	11th to 20th	Day	45% 7% 17% 23% 8%	4083
	21st to end	Day	38% 9% 13% 30% 10% 1	4404
September	1st to 10th	Day	42% 9% 14% 23% 11% 2	2280
	11th to 20th	Day	39% 6% 14% 27% 13%	2136
	21st to end	Day	48% 9% 13% 22% 8%	2071
October	1st to 10th	Day	45% 8% 12% 24% 11% 1	3160
	11th to 20th	Day	45% 8% 13% 20% 14% 1	3140
	21st to end	Day	59% 7% 12% 16% 6%	3428
November	1st to 10th	Day	52% 9% 15% 16% 7%	1622
	11th to 20th	Day	58% 10% 13% 12% 7% 1	1520
	21st to end	Day	65% 9% 13% 10% 3	1520
December	1st to 10th	Day	72% 8% 11% 6% 2	1520
	11th to 20th	Day	67% 9% 12% 9% 3	1906
	21st to end	Day	80% 7% 6% 6% 1	2772
January	1st to 10th	Night	64% 11% 12% 11% 3	4429
	11th to 20th	Night	70% 13% 9% 6% 2	4170
	21st to end	Night	66% 12% 11% 7% 3 1	4532
February	1st to 10th	Night	59% 9% 11% 16% 4	2470
	11th to 20th	Night	59% 8% 12% 15% 6%	2405
	21st to end	Night	54% 10% 13% 14% 8% 1	1975
March	1st to 10th	Night	51% 9% 13% 19% 7% 1	3425
	11th to 20th	Night	42% 11% 15% 21% 9% 2	3480
	21st to end	Night	42% 7% 12% 23% 15% 1	3817
April	1st to 10th	Night	54% 6% 10% 17% 12% 1	1956
	11th to 20th	Night	45% 7% 11% 21% 15% 2	1782
	21st to end	Night	48% 7% 12% 16% 16% 2	1710
May	1st to 10th	Night	42% 8% 13% 17% 16% 4	2840
	11th to 20th	Night	40% 11% 15% 22% 10% 2	2562
	21st to end	Night	28% 10% 13% 24% 22% 2	2739
June	1st to 10th	Night	37% 8% 13% 23% 17% 2	1520
	11th to 20th	Night	33% 9% 14% 23% 19% 1	1409
	21st to end	Night	35% 9% 13% 27% 16% 1	1330
July	1st to 10th	Night	30% 7% 14% 25% 20% 3	2201
	11th to 20th	Night	30% 6% 12% 34% 17% 1	2472
	21st to end	Night	30% 9% 15% 29% 15% 2	2985
August	1st to 10th	Night	34% 6% 13% 29% 15% 2	2814
	11th to 20th	Night	34% 7% 16% 29% 13% 1	2812
	21st to end	Night	33% 7% 13% 32% 14% 1	3219
September	1st to 10th	Night	32% 8% 17% 28% 13% 1	1900
	11th to 20th	Night	28% 7% 14% 32% 19%	2042
	21st to end	Night	43% 7% 13% 26% 10% 1	2109
October	1st to 10th	Night	36% 7% 8% 26% 21% 1	3800
	11th to 20th	Night	44% 7% 11% 22% 14% 2	3779
	21st to end	Night	47% 8% 14% 23% 8%	4120
November	1st to 10th	Night	47% 8% 14% 20% 9% 1	2523
	11th to 20th	Night	52% 10% 14% 15% 7% 1	2660
	21st to end	Night	58% 12% 15% 12% 2 1	2660
December	1st to 10th	Night	64% 10% 14% 9% 2	2660
	11th to 20th	Night	64% 11% 12% 10% 3	3288
	21st to end	Night	77% 9% 7% 6% 1	4884

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% 27% 32% 14% 3 1	180
	11th to 20th	Day	22% 33% 30% 11% 4	257
	21st to end	Day	26% 28% 34% 10% 2	297
February	1st to 10th	Day	28% 35% 27% 9% 2	270
	11th to 20th	Day	27% 32% 36% 4 1	270
	21st to end	Day	36% 35% 24% 5%	225
March	1st to 10th	Day	23% 29% 31% 13% 3	452
	11th to 20th	Day	24% 25% 36% 11% 4	460
	21st to end	Day	29% 23% 30% 13% 4	506
April	1st to 10th	Day	25% 25% 34% 11% 5%	460
	11th to 20th	Day	33% 23% 24% 10% 7% 3	452
	21st to end	Day	27% 23% 31% 13% 5% 2	460
May	1st to 10th	Day	22% 18% 33% 17% 8% 2	463
	11th to 20th	Day	21% 15% 34% 18% 9% 3	487
	21st to end	Day	14% 16% 31% 26% 9% 3	529
June	1st to 10th	Day	16% 17% 36% 23% 7% 2	490
	11th to 20th	Day	15% 15% 32% 27% 9% 2	594
	21st to end	Day	16% 15% 37% 22% 7% 2	680
July	1st to 10th	Day	12% 10% 33% 27% 14% 3	652
	11th to 20th	Day	13% 10% 33% 27% 11% 6%	484
	21st to end	Day	9% 11% 38% 25% 12% 5%	532
August	1st to 10th	Day	10% 11% 29% 29% 15% 6%	486
	11th to 20th	Day	8% 10% 31% 25% 18% 8%	479
	21st to end	Day	14% 12% 30% 24% 15% 5%	539
September	1st to 10th	Day	14% 12% 32% 23% 11% 7%	490
	11th to 20th	Day	10% 11% 25% 25% 18% 10%	490
	21st to end	Day	17% 16% 28% 21% 14% 4	490
October	1st to 10th	Day	23% 21% 24% 19% 10% 4	490
	11th to 20th	Day	23% 23% 33% 14% 5% 1	490
	21st to end	Day	34% 24% 27% 13% 2	539
November	1st to 10th	Day	26% 25% 30% 15% 3 1	247
	11th to 20th	Day	26% 26% 33% 9% 4 2	180
	21st to end	Day	24% 28% 38% 9% 1	180
December	1st to 10th	Day	31% 30% 31% 8% 1	180
	11th to 20th	Day	28% 31% 28% 12% 1 1	180
	21st to end	Day	30% 33% 29% 7% 2	198
January	1st to 10th	Night	21% 31% 31% 13% 3	760
	11th to 20th	Night	25% 24% 32% 17% 2	760
	21st to end	Night	17% 22% 36% 20% 5%	836
February	1st to 10th	Night	22% 29% 33% 15% 1	760
	11th to 20th	Night	22% 26% 36% 14% 3	743
	21st to end	Night	21% 28% 35% 14% 2	628
March	1st to 10th	Night	20% 25% 35% 17% 3	760
	11th to 20th	Night	22% 25% 32% 16% 4	760
	21st to end	Night	21% 20% 33% 19% 6%	836
April	1st to 10th	Night	25% 21% 34% 18% 2	760
	11th to 20th	Night	21% 19% 34% 18% 7% 1	658
	21st to end	Night	21% 16% 33% 22% 7%	570
May	1st to 10th	Night	18% 11% 31% 30% 9% 2	570
	11th to 20th	Night	18% 9% 35% 28% 9% 1	414
	21st to end	Night	11% 11% 33% 33% 13%	411
June	1st to 10th	Night	15% 8% 37% 30% 9% 1	380
	11th to 20th	Night	11% 11% 30% 36% 12%	380
	21st to end	Night	13% 8% 34% 31% 14%	380
July	1st to 10th	Night	5% 6% 30% 40% 18% 1	370
	11th to 20th	Night	9% 10% 29% 32% 19% 1	368
	21st to end	Night	8% 7% 31% 36% 17% 1	620
August	1st to 10th	Night	10% 4 27% 35% 22% 2	567
	11th to 20th	Night	7% 6% 24% 39% 21% 2	564
	21st to end	Night	14% 6% 30% 27% 21% 2	683
September	1st to 10th	Night	11% 10% 29% 29% 17% 5%	760
	11th to 20th	Night	12% 9% 26% 28% 21% 5%	760
	21st to end	Night	19% 11% 25% 27% 15% 3	760
October	1st to 10th	Night	18% 13% 34% 20% 13% 2	760
	11th to 20th	Night	25% 17% 32% 20% 6% 1	760
	21st to end	Night	25% 23% 29% 19% 3	836
November	1st to 10th	Night	21% 20% 30% 20% 7% 1	755
	11th to 20th	Night	20% 28% 28% 17% 5% 1	760
	21st to end	Night	23% 24% 33% 17% 3	760
December	1st to 10th	Night	28% 26% 31% 13% 2	760
	11th to 20th	Night	22% 29% 34% 13% 3	760
	21st to end	Night	29% 25% 31% 14% 2	836

Page generated at 2024-11-01 22:47:42. Version ac07

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