Richland Creek Recreation Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Richland Creek Recreation Area clear sky chart from 2005-11-06 to 2025-01-07.

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	11% 7% 3 6% 5% 4 4 3 5% 6% 44%	104510
	Night	11% 7% 3 6% 4 3 4 3 5% 6% 48%	104599
Transparency	Day	38% 5% 10% 24% 18% 5%	108156
	Night	35% 5% 10% 25% 20% 6%	109093
Seeing	Day	17% 14% 28% 24% 14% 4	15620
	Night	16% 15% 28% 26% 14% 2	25510

By Month

Percentage Cloud Cover SE (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% 10% 4 7% 4 3 3 3 4 5% 45%	2901
	11th to 20th	Day	10% 9% 3 6% 5% 3 3 3 4 5% 50%	2850
	21st to end	Day	21% 7% 3 4 3 2 3 3 4 5% 45%	3135
February	1st to 10th	Day	16% 10% 4 6% 5% 3 3 2 4 4 43%	1710
	11th to 20th	Day	12% 9% 3 8% 5% 4 4 3 5% 6% 41%	1739
	21st to end	Day	16% 12% 3 6% 5% 4 4 3 4 5% 38%	1641
March	1st to 10th	Day	17% 9% 3 8% 4 4 3 3 4 4 40%	3436
	11th to 20th	Day	12% 7% 2 5% 4 3 4 3 4 6% 48%	3480
	21st to end	Day	15% 10% 3 7% 5% 3 4 3 5% 5% 40%	3814
April	1st to 10th	Day	11% 8% 3 7% 5% 4 5% 4 5% 5% 43%	2258
	11th to 20th	Day	15% 8% 2 6% 4 5% 5% 3 5% 6% 40%	2254
	21st to end	Day	17% 8% 3 7% 5% 5% 4 4 5% 4 38%	2280
May	1st to 10th	Day	15% 9% 3 9% 6% 5% 5% 4 5% 5% 35%	3875
	11th to 20th	Day	13% 7% 3 7% 5% 5% 5% 4 6% 7% 38%	4082
	21st to end	Day	13% 8% 3 8% 6% 5% 5% 4 5% 7% 34%	4477
June	1st to 10th	Day	8% 6% 2 5% 5% 5% 6% 5% 7% 8% 41%	2641
	11th to 20th	Day	5% 5% 2 6% 6% 7% 6% 5% 7% 8% 43%	2660
	21st to end	Day	4 4 2 4 5% 5% 7% 5% 8% 10% 47%	2534
July	1st to 10th	Day	10% 5% 3 6% 5% 5% 6% 4 7% 10% 40%	4120
	11th to 20th	Day	5% 4 2 5% 4 4 5% 4 6% 9% 53%	4120
	21st to end	Day	9% 7% 3 9% 6% 6% 5% 5% 8% 9% 33%	4465
August	1st to 10th	Day	5% 3 2 4 4 4 4 3 5% 9% 57%	4104
	11th to 20th	Day	11% 6% 2 6% 4 4 5% 4 6% 9% 43%	3833
	21st to end	Day	5% 3 2 5% 4 5% 6% 4 7% 8% 52%	4180
September	1st to 10th	Day	11% 6% 2 6% 4 3 5% 3 4 7% 47%	2280
	11th to 20th	Day	13% 5% 2 6% 3 5% 5% 5% 5% 9% 43%	2243
	21st to end	Day	9% 5% 2 5% 4 4 4 3 6% 7% 51%	2000
October	1st to 10th	Day	7% 5% 2 6% 3 4 4 2 4 6% 56%	1900
	11th to 20th	Day	11% 6% 3 5% 3 2 3 2 3 4 57%	1900
	21st to end	Day	18% 7% 3 5% 3 4 2 3 4 3 50%	2090
November	1st to 10th	Day	12% 7% 3 4 4 3 3 2 4 5% 54%	1958
	11th to 20th	Day	8% 8% 3 6% 4 3 4 2 5% 6% 51%	1930
	21st to end	Day	14% 9% 3 6% 5% 3 3 3 5% 4 47%	1670
December	1st to 10th	Day	10% 8% 3 6% 3 3 3 3 4 4 53%	2610
	11th to 20th	Day	10% 10% 4 8% 5% 3 3 3 3 5% 46%	3008
	21st to end	Day	14% 13% 4 7% 5% 4 5% 3 5% 5% 34%	4332
January	1st to 10th	Night	11% 8% 4 10% 6% 4 4 3 4 4 41%	4187
	11th to 20th	Night	11% 6% 2 6% 4 3 3 2 3 5% 53%	4120
	21st to end	Night	18% 11% 3 5% 3 3 3 2 3 4 44%	4532
February	1st to 10th	Night	15% 8% 4 7% 5% 4 3 3 6% 5% 40%	2470
	11th to 20th	Night	14% 7% 3 7% 4 3 4 3 5% 5% 44%	2327
	21st to end	Night	14% 9% 3 7% 4 3 3 3 4 5% 45%	1828
March	1st to 10th	Night	18% 11% 3 6% 4 4 3 3 4 5% 39%	3419
	11th to 20th	Night	13% 8% 3 5% 4 3 3 3 4 6% 48%	3480
	21st to end	Night	11% 9% 2 8% 5% 5% 4 3 4 7% 41%	3817
April	1st to 10th	Night	9% 7% 2 6% 4 4 4 3 5% 6% 48%	1920
	11th to 20th	Night	12% 8% 3 7% 4 3 3 3 5% 6% 47%	1875
	21st to end	Night	14% 8% 3 6% 3 3 4 3 6% 6% 42%	1900
May	1st to 10th	Night	14% 9% 3 7% 3 4 4 3 5% 6% 42%	3020
	11th to 20th	Night	13% 8% 2 7% 4 4 4 4 6% 7% 41%	2823
	21st to end	Night	14% 8% 3 7% 4 4 4 4 5% 7% 40%	3090
June	1st to 10th	Night	6% 4 2 5% 3 4 4 4 6% 10% 52%	1530
	11th to 20th	Night	5% 4 1 4 3 3 4 4 7% 10% 57%	1520
	21st to end	Night	3 3 2 4 3 3 3 3 6% 9% 60%	1637
July	1st to 10th	Night	7% 5% 2 6% 4 5% 4 4 5% 10% 48%	2850
	11th to 20th	Night	5% 2 1 3 3 3 3 2 4 9% 64%	2850
	21st to end	Night	7% 8% 3 7% 5% 4 5% 4 6% 8% 42%	3098
August	1st to 10th	Night	3 2 1 3 3 3 4 4 6% 9% 61%	2836
	11th to 20th	Night	4 4 2 5% 4 4 4 4 7% 9% 54%	2996
	21st to end	Night	4 3 1 5% 3 3 4 4 5% 9% 61%	3476
September	1st to 10th	Night	7% 5% 2 4 3 4 4 3 5% 7% 55%	1900
	11th to 20th	Night	11% 7% 2 5% 3 3 4 4 5% 6% 49%	1932
	21st to end	Night	7% 6% 1 5% 3 3 3 3 5% 6% 57%	2161
October	1st to 10th	Night	7% 4 1 4 3 3 3 3 5% 7% 60%	2280
	11th to 20th	Night	12% 5% 2 4 3 3 3 3 3 4 59%	2280
	21st to end	Night	17% 6% 2 5% 3 2 3 2 4 4 52%	2508
November	1st to 10th	Night	10% 7% 2 6% 3 3 3 3 4 5% 55%	2340
	11th to 20th	Night	10% 5% 2 5% 3 3 3 3 5% 6% 55%	2465
	21st to end	Night	12% 8% 3 5% 4 4 3 3 3 6% 50%	2725
December	1st to 10th	Night	10% 8% 3 6% 3 3 3 2 4 5% 52%	4580
	11th to 20th	Night	11% 10% 3 8% 4 4 4 2 3 4 46%	5199
	21st to end	Night	17% 12% 5% 7% 4 4 4 2 4 4 37%	6628

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	42% 4 6% 24% 21% 3	2902
	11th to 20th	Day	38% 4 8% 23% 22% 5%	2850
	21st to end	Day	42% 3 8% 19% 21% 8%	3135
February	1st to 10th	Day	46% 4 9% 21% 17% 4	1710
	11th to 20th	Day	45% 4 7% 20% 19% 5%	1748
	21st to end	Day	48% 4 7% 16% 16% 9%	1641
March	1st to 10th	Day	48% 3 7% 15% 16% 11%	3436
	11th to 20th	Day	37% 4 10% 24% 20% 5%	3480
	21st to end	Day	46% 5% 9% 21% 18% 1	3814
April	1st to 10th	Day	42% 6% 9% 19% 21% 3	2258
	11th to 20th	Day	45% 5% 9% 20% 16% 5%	2254
	21st to end	Day	47% 6% 8% 22% 15% 2	2280
May	1st to 10th	Day	50% 6% 9% 19% 14% 1	3910
	11th to 20th	Day	41% 9% 13% 24% 13% 1	4086
	21st to end	Day	48% 7% 11% 19% 13% 1	4489
June	1st to 10th	Day	37% 9% 14% 26% 13% 1	2641
	11th to 20th	Day	34% 8% 15% 26% 15% 2	2660
	21st to end	Day	28% 9% 15% 28% 16% 4	2534
July	1st to 10th	Day	36% 7% 17% 27% 11% 2	4056
	11th to 20th	Day	26% 6% 11% 34% 21% 2	4051
	21st to end	Day	44% 7% 17% 25% 7%	4325
August	1st to 10th	Day	24% 6% 17% 31% 18% 5%	4090
	11th to 20th	Day	38% 6% 16% 28% 12% 1	3871
	21st to end	Day	28% 7% 15% 34% 14% 3	4179
September	1st to 10th	Day	37% 6% 10% 22% 17% 8%	2280
	11th to 20th	Day	37% 6% 11% 20% 21% 4	2243
	21st to end	Day	32% 5% 9% 23% 26% 5%	2000
October	1st to 10th	Day	18% 3 5% 16% 37% 22%	3160
	11th to 20th	Day	20% 3 3 22% 36% 16%	3140
	21st to end	Day	32% 4 7% 30% 22% 5%	3428
November	1st to 10th	Day	34% 3 8% 25% 22% 9%	1958
	11th to 20th	Day	34% 3 7% 22% 23% 11%	1930
	21st to end	Day	41% 4 7% 20% 24% 5%	1670
December	1st to 10th	Day	35% 3 7% 28% 23% 3	2610
	11th to 20th	Day	41% 3 6% 23% 25% 3	3005
	21st to end	Day	49% 5% 9% 19% 14% 3	4332
January	1st to 10th	Night	44% 5% 6% 19% 24% 3	4187
	11th to 20th	Night	35% 4 9% 25% 21% 6%	4120
	21st to end	Night	45% 4 7% 20% 20% 4	4532
February	1st to 10th	Night	45% 4 8% 21% 17% 4	2470
	11th to 20th	Night	41% 4 9% 22% 19% 5%	2328
	21st to end	Night	42% 4 7% 20% 19% 8%	1828
March	1st to 10th	Night	48% 4 7% 14% 16% 10%	3419
	11th to 20th	Night	37% 5% 8% 27% 19% 4	3480
	21st to end	Night	41% 7% 10% 25% 16% 1	3817
April	1st to 10th	Night	36% 5% 10% 22% 20% 6%	1920
	11th to 20th	Night	37% 4 8% 24% 20% 6%	1875
	21st to end	Night	40% 6% 11% 26% 15% 2	1900
May	1st to 10th	Night	42% 6% 14% 22% 13% 2	3050
	11th to 20th	Night	39% 8% 16% 24% 11% 2	2824
	21st to end	Night	41% 8% 13% 25% 12% 2	3099
June	1st to 10th	Night	26% 7% 15% 32% 17% 2	1530
	11th to 20th	Night	21% 6% 14% 37% 19% 3	1520
	21st to end	Night	21% 6% 17% 29% 21% 6%	1637
July	1st to 10th	Night	31% 7% 20% 23% 17% 2	2805
	11th to 20th	Night	20% 5% 12% 38% 23% 2	2796
	21st to end	Night	38% 7% 17% 29% 10%	2999
August	1st to 10th	Night	18% 6% 19% 35% 21% 1	2826
	11th to 20th	Night	26% 6% 22% 30% 15% 1	3024
	21st to end	Night	22% 5% 15% 36% 19% 3	3476
September	1st to 10th	Night	27% 6% 10% 30% 18% 8%	1900
	11th to 20th	Night	33% 7% 10% 21% 25% 4	1932
	21st to end	Night	27% 6% 10% 23% 30% 6%	2161
October	1st to 10th	Night	14% 3 7% 15% 33% 28%	3800
	11th to 20th	Night	18% 3 4 17% 37% 21%	3779
	21st to end	Night	29% 3 6% 27% 24% 10%	4120
November	1st to 10th	Night	32% 4 8% 24% 25% 8%	2340
	11th to 20th	Night	30% 4 7% 24% 26% 9%	2465
	21st to end	Night	37% 4 8% 21% 25% 5%	2725
December	1st to 10th	Night	35% 2 8% 33% 18% 3	4580
	11th to 20th	Night	42% 3 5% 20% 22% 7%	5201
	21st to end	Night	50% 5% 7% 23% 12% 4	6628

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	27% 26% 32% 12% 2	288
	11th to 20th	Day	30% 31% 27% 10% 1	270
	21st to end	Day	27% 27% 34% 8% 3	297
February	1st to 10th	Day	32% 28% 29% 9% 2	270
	11th to 20th	Day	30% 34% 26% 9% 1	270
	21st to end	Day	41% 27% 26% 4 2	225
March	1st to 10th	Day	26% 26% 32% 14% 2	270
	11th to 20th	Day	36% 21% 33% 9% 1	270
	21st to end	Day	28% 34% 28% 8% 2	297
April	1st to 10th	Day	24% 27% 31% 12% 5%	438
	11th to 20th	Day	24% 25% 33% 12% 5% 1	452
	21st to end	Day	25% 20% 34% 15% 5% 1	460
May	1st to 10th	Day	22% 19% 37% 16% 6%	521
	11th to 20th	Day	16% 17% 33% 22% 10% 1	675
	21st to end	Day	12% 14% 37% 23% 12% 3	734
June	1st to 10th	Day	10% 7% 27% 32% 19% 5%	680
	11th to 20th	Day	6% 5% 30% 36% 20% 3	680
	21st to end	Day	4 6% 34% 34% 18% 4	680
July	1st to 10th	Day	9% 4 22% 32% 27% 7%	671
	11th to 20th	Day	4 3 24% 34% 25% 9%	668
	21st to end	Day	8% 3 15% 35% 28% 10%	739
August	1st to 10th	Day	10% 2 17% 39% 26% 5%	676
	11th to 20th	Day	15% 2 16% 35% 25% 6%	547
	21st to end	Day	9% 2 11% 35% 32% 12%	539
September	1st to 10th	Day	13% 5% 17% 30% 29% 7%	490
	11th to 20th	Day	12% 5% 19% 33% 23% 9%	453
	21st to end	Day	12% 9% 30% 29% 19% 1	300
October	1st to 10th	Day	7% 13% 32% 34% 12% 1	300
	11th to 20th	Day	14% 16% 44% 19% 6% 1	300
	21st to end	Day	31% 16% 33% 15% 4 1	330
November	1st to 10th	Day	21% 15% 41% 17% 5% 1	300
	11th to 20th	Day	19% 22% 41% 12% 4 2	300
	21st to end	Day	27% 22% 31% 15% 4	300
December	1st to 10th	Day	23% 29% 29% 13% 4 2	300
	11th to 20th	Day	26% 30% 29% 11% 3	300
	21st to end	Day	28% 27% 33% 10% 2	330
January	1st to 10th	Night	21% 24% 34% 18% 3 1	981
	11th to 20th	Night	21% 28% 30% 16% 3	950
	21st to end	Night	19% 24% 34% 19% 3	1045
February	1st to 10th	Night	23% 24% 33% 18% 2	950
	11th to 20th	Night	22% 28% 35% 13% 2	853
	21st to end	Night	25% 27% 30% 17% 1	572
March	1st to 10th	Night	22% 20% 32% 23% 3	570
	11th to 20th	Night	25% 18% 32% 22% 3	570
	21st to end	Night	21% 22% 33% 18% 6%	627
April	1st to 10th	Night	17% 25% 31% 24% 4	570
	11th to 20th	Night	18% 21% 29% 25% 7%	563
	21st to end	Night	17% 19% 36% 19% 7% 1	570
May	1st to 10th	Night	12% 16% 38% 27% 7%	570
	11th to 20th	Night	17% 11% 28% 27% 16% 1	561
	21st to end	Night	10% 10% 28% 29% 19% 4	617
June	1st to 10th	Night	9% 5% 20% 34% 29% 3	570
	11th to 20th	Night	5% 4 26% 38% 24% 3	570
	21st to end	Night	4 4 22% 40% 27% 4	570
July	1st to 10th	Night	5% 3 16% 34% 34% 8%	555
	11th to 20th	Night	5% 2 16% 34% 36% 7%	552
	21st to end	Night	6% 2 12% 38% 35% 6%	624
August	1st to 10th	Night	6% 1 14% 38% 36% 6%	567
	11th to 20th	Night	9% 2 16% 37% 31% 6%	564
	21st to end	Night	7% 1 12% 38% 33% 7%	627
September	1st to 10th	Night	10% 2 13% 35% 36% 4	570
	11th to 20th	Night	15% 2 14% 36% 26% 7%	570
	21st to end	Night	11% 5% 21% 30% 29% 3	641
October	1st to 10th	Night	8% 7% 25% 30% 26% 3	760
	11th to 20th	Night	16% 14% 30% 30% 10%	760
	21st to end	Night	22% 16% 31% 23% 8% 1	836
November	1st to 10th	Night	13% 17% 34% 24% 11%	780
	11th to 20th	Night	16% 16% 33% 27% 7%	800
	21st to end	Night	19% 23% 30% 20% 7%	925
December	1st to 10th	Night	22% 18% 35% 20% 5%	1000
	11th to 20th	Night	20% 21% 31% 23% 5%	1000
	21st to end	Night	22% 23% 30% 20% 3	1100

Page generated at 2025-01-04 02:24:02. Version ac07

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