Platte River Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Platte River Campground clear sky chart from 2005-11-06 to 2024-11-30.

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	14% 11% 4 9% 5% 4 4 3 5% 6% 34%	101506
	Night	15% 14% 5% 11% 6% 4 4 3 4 5% 28%	98132
Transparency	Day	50% 6% 11% 21% 11% 1	105038
	Night	57% 5% 11% 17% 9% 1	102728
Seeing	Day	19% 16% 32% 23% 8% 2	15971
	Night	22% 15% 29% 25% 9% 1	25927

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	12% 27% 15% 22% 8% 5% 2 1 2 1 5%	2527
	11th to 20th	Day	13% 20% 9% 26% 13% 9% 2 1 2 2 3	2530
	21st to end	Day	17% 24% 13% 15% 8% 5% 5% 2 2 2 7%	2783
February	1st to 10th	Day	10% 20% 7% 16% 17% 7% 3 2 3 3 13%	1628
	11th to 20th	Day	12% 16% 7% 16% 11% 8% 4 3 4 3 14%	1848
	21st to end	Day	13% 17% 6% 15% 11% 5% 4 3 4 5% 17%	1570
March	1st to 10th	Day	12% 15% 5% 9% 6% 4 4 3 5% 6% 32%	3120
	11th to 20th	Day	10% 11% 7% 15% 5% 4 4 3 5% 6% 30%	3342
	21st to end	Day	18% 13% 7% 15% 5% 4 4 4 3 4 24%	4027
April	1st to 10th	Day	17% 14% 4 8% 5% 4 4 3 6% 6% 30%	2280
	11th to 20th	Day	20% 12% 3 6% 4 4 3 3 4 6% 34%	2318
	21st to end	Day	15% 10% 4 7% 5% 4 5% 4 6% 7% 35%	2470
May	1st to 10th	Day	13% 8% 3 6% 4 4 4 3 5% 6% 43%	4082
	11th to 20th	Day	10% 7% 2 6% 4 4 4 3 5% 6% 49%	4293
	21st to end	Day	12% 5% 2 6% 5% 4 5% 4 6% 7% 43%	4824
June	1st to 10th	Day	12% 5% 2 6% 5% 4 4 3 6% 8% 44%	2660
	11th to 20th	Day	11% 5% 2 6% 4 4 4 4 6% 9% 45%	2660
	21st to end	Day	13% 6% 2 6% 3 4 4 4 6% 9% 43%	2660
July	1st to 10th	Day	17% 7% 2 5% 4 4 3 4 6% 7% 41%	4440
	11th to 20th	Day	8% 4 1 4 3 3 4 3 6% 9% 56%	4440
	21st to end	Day	8% 5% 2 5% 4 4 4 4 6% 9% 50%	4813
August	1st to 10th	Day	9% 6% 2 6% 5% 4 5% 4 7% 9% 43%	4302
	11th to 20th	Day	14% 5% 2 5% 3 3 3 3 5% 6% 51%	4044
	21st to end	Day	12% 7% 3 6% 4 4 4 4 4 6% 47%	4258
September	1st to 10th	Day	14% 6% 2 5% 4 4 4 3 5% 7% 44%	2280
	11th to 20th	Day	13% 5% 2 4 4 4 4 4 6% 8% 47%	2090
	21st to end	Day	16% 7% 2 7% 4 4 4 3 6% 7% 39%	2090
October	1st to 10th	Day	16% 9% 3 8% 4 4 3 3 6% 7% 37%	2090
	11th to 20th	Day	23% 17% 4 10% 5% 4 4 3 4 5% 21%	1791
	21st to end	Day	25% 16% 5% 9% 6% 4 5% 3 4 4 19%	1881
November	1st to 10th	Day	19% 18% 4 7% 4 4 4 3 4 6% 27%	1762
	11th to 20th	Day	15% 26% 6% 12% 6% 4 4 3 4 5% 15%	1800
	21st to end	Day	21% 25% 9% 13% 4 4 3 2 2 4 14%	1714
December	1st to 10th	Day	15% 29% 13% 16% 6% 3 3 2 3 2 9%	1436
	11th to 20th	Day	16% 25% 9% 16% 8% 4 4 3 3 4 7%	1870
	21st to end	Day	18% 23% 11% 15% 7% 5% 4 2 3 3 8%	2783
January	1st to 10th	Night	14% 28% 9% 21% 7% 4 2 1 2 2 10%	4428
	11th to 20th	Night	11% 19% 9% 22% 15% 10% 2 2 1 2 6%	4440
	21st to end	Night	15% 24% 12% 17% 9% 6% 4 2 3 2 7%	4884
February	1st to 10th	Night	10% 19% 8% 18% 13% 7% 4 3 3 3 12%	2550
	11th to 20th	Night	11% 16% 6% 19% 11% 6% 5% 2 3 4 16%	2218
	21st to end	Night	15% 18% 5% 16% 8% 4 3 3 5% 4 19%	1884
March	1st to 10th	Night	16% 11% 4 7% 4 4 3 3 5% 6% 36%	3733
	11th to 20th	Night	8% 14% 5% 11% 5% 4 4 3 5% 6% 34%	3618
	21st to end	Night	16% 11% 5% 15% 5% 4 4 4 5% 5% 26%	3635
April	1st to 10th	Night	18% 13% 4 7% 5% 4 4 3 5% 6% 29%	1900
	11th to 20th	Night	20% 12% 3 7% 4 4 4 3 5% 5% 34%	1811
	21st to end	Night	16% 11% 4 6% 4 5% 4 3 5% 7% 36%	1710
May	1st to 10th	Night	15% 8% 2 7% 4 4 4 3 5% 7% 39%	2813
	11th to 20th	Night	12% 8% 2 6% 5% 4 5% 4 5% 7% 41%	2606
	21st to end	Night	18% 6% 2 5% 4 3 4 4 6% 8% 41%	2743
June	1st to 10th	Night	14% 7% 2 6% 5% 4 5% 3 5% 7% 42%	1520
	11th to 20th	Night	12% 5% 3 7% 5% 4 3 4 7% 9% 41%	1520
	21st to end	Night	11% 6% 3 6% 4 3 4 4 7% 7% 45%	1520
July	1st to 10th	Night	14% 8% 2 6% 4 3 4 3 6% 8% 40%	2530
	11th to 20th	Night	6% 4 2 6% 4 4 4 4 5% 8% 54%	2530
	21st to end	Night	9% 5% 2 7% 5% 4 5% 4 6% 7% 47%	2750
August	1st to 10th	Night	11% 6% 3 8% 5% 4 5% 4 5% 8% 42%	2631
	11th to 20th	Night	13% 6% 2 5% 4 3 3 4 4 7% 50%	2785
	21st to end	Night	10% 7% 3 7% 5% 4 4 3 4 7% 47%	3396
September	1st to 10th	Night	13% 6% 2 6% 4 3 3 2 5% 7% 49%	1900
	11th to 20th	Night	14% 6% 2 6% 4 4 4 3 6% 5% 49%	2070
	21st to end	Night	17% 8% 2 8% 4 4 4 4 5% 7% 39%	2090
October	1st to 10th	Night	18% 9% 3 8% 4 4 3 3 4 6% 38%	2090
	11th to 20th	Night	24% 14% 4 10% 4 3 3 3 4 5% 25%	2385
	21st to end	Night	26% 15% 4 9% 5% 4 3 3 4 5% 22%	2717
November	1st to 10th	Night	17% 18% 4 8% 5% 4 4 3 4 6% 27%	2536
	11th to 20th	Night	16% 24% 6% 14% 5% 4 4 2 3 3 18%	2600
	21st to end	Night	17% 24% 8% 13% 4 4 3 3 4 4 14%	2679
December	1st to 10th	Night	16% 30% 11% 15% 6% 3 3 2 2 2 10%	2723
	11th to 20th	Night	14% 24% 10% 19% 8% 3 3 2 3 3 10%	3303
	21st to end	Night	22% 25% 10% 12% 5% 4 3 2 3 3 11%	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	90% 3 4 2 1	2528
	11th to 20th	Day	91% 3 2 3	2530
	21st to end	Day	86% 3 8% 3 1	2783
February	1st to 10th	Day	78% 4 7% 9% 1	1628
	11th to 20th	Day	73% 6% 9% 8% 3	1858
	21st to end	Day	68% 6% 10% 11% 4 1	1570
March	1st to 10th	Day	52% 7% 12% 20% 10% 1	3120
	11th to 20th	Day	53% 7% 13% 19% 7% 1	3342
	21st to end	Day	63% 7% 8% 16% 6% 1	4027
April	1st to 10th	Day	54% 6% 10% 19% 11%	2280
	11th to 20th	Day	50% 6% 9% 19% 15% 2	2318
	21st to end	Day	47% 6% 11% 18% 15% 2	2470
May	1st to 10th	Day	40% 6% 9% 25% 17% 2	4120
	11th to 20th	Day	36% 5% 11% 28% 18% 2	4297
	21st to end	Day	37% 7% 12% 23% 19% 2	4837
June	1st to 10th	Day	36% 7% 13% 27% 15% 2	2660
	11th to 20th	Day	35% 6% 14% 25% 18% 1	2660
	21st to end	Day	37% 6% 17% 25% 14% 1	2660
July	1st to 10th	Day	41% 6% 15% 25% 12% 2	4371
	11th to 20th	Day	25% 5% 16% 37% 14% 2	4365
	21st to end	Day	29% 7% 14% 28% 20% 1	4662
August	1st to 10th	Day	37% 6% 15% 29% 13% 1	4287
	11th to 20th	Day	34% 5% 14% 32% 14% 1	4083
	21st to end	Day	38% 6% 14% 29% 12% 1	4257
September	1st to 10th	Day	39% 6% 13% 26% 14% 1	2280
	11th to 20th	Day	35% 7% 17% 29% 11% 1	2090
	21st to end	Day	43% 6% 16% 26% 9%	2090
October	1st to 10th	Day	32% 4 9% 35% 19% 1	3480
	11th to 20th	Day	56% 5% 11% 19% 9%	2942
	21st to end	Day	61% 6% 14% 15% 4	3081
November	1st to 10th	Day	58% 6% 10% 17% 8%	1762
	11th to 20th	Day	71% 6% 10% 10% 4	1800
	21st to end	Day	76% 5% 10% 7% 2	1714
December	1st to 10th	Day	84% 4 5% 6% 1	1436
	11th to 20th	Day	81% 6% 8% 3 1	1867
	21st to end	Day	82% 5% 7% 5% 1	2783
January	1st to 10th	Night	83% 5% 6% 6% 1	4428
	11th to 20th	Night	87% 3 5% 4	4440
	21st to end	Night	84% 4 8% 3	4884
February	1st to 10th	Night	77% 4 7% 10% 2	2550
	11th to 20th	Night	71% 5% 8% 12% 3	2219
	21st to end	Night	66% 4 14% 12% 4	1884
March	1st to 10th	Night	48% 5% 17% 22% 8%	3733
	11th to 20th	Night	48% 7% 12% 24% 8% 1	3618
	21st to end	Night	58% 7% 10% 18% 7% 1	3635
April	1st to 10th	Night	55% 5% 9% 19% 10% 1	1900
	11th to 20th	Night	52% 5% 8% 20% 12% 3	1811
	21st to end	Night	48% 5% 11% 20% 13% 3	1710
May	1st to 10th	Night	43% 6% 13% 19% 16% 3	2840
	11th to 20th	Night	41% 6% 11% 26% 15% 1	2607
	21st to end	Night	41% 6% 14% 19% 15% 5%	2751
June	1st to 10th	Night	41% 5% 12% 27% 14% 2	1520
	11th to 20th	Night	38% 6% 12% 24% 18% 2	1520
	21st to end	Night	38% 7% 12% 27% 15% 2	1520
July	1st to 10th	Night	42% 4 13% 24% 12% 5%	2490
	11th to 20th	Night	27% 6% 15% 32% 18% 2	2482
	21st to end	Night	35% 6% 12% 24% 21% 2	2662
August	1st to 10th	Night	39% 7% 14% 25% 13% 1	2622
	11th to 20th	Night	34% 5% 15% 30% 16% 1	2812
	21st to end	Night	37% 6% 14% 22% 20% 1	3396
September	1st to 10th	Night	35% 5% 14% 24% 20% 1	1900
	11th to 20th	Night	37% 5% 15% 30% 13% 1	2070
	21st to end	Night	44% 5% 14% 25% 10% 1	2090
October	1st to 10th	Night	41% 4 8% 34% 12% 1	3480
	11th to 20th	Night	53% 4 9% 22% 11%	3960
	21st to end	Night	55% 4 14% 21% 5%	4467
November	1st to 10th	Night	58% 6% 11% 18% 7% 1	2536
	11th to 20th	Night	72% 4 10% 8% 5% 1	2600
	21st to end	Night	74% 5% 11% 8% 1	2679
December	1st to 10th	Night	82% 4 6% 7% 1	2723
	11th to 20th	Night	80% 5% 10% 4 2	3305
	21st to end	Night	80% 5% 10% 4 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	20% 25% 37% 12% 5% 1	270
	11th to 20th	Day	28% 22% 37% 11% 2	270
	21st to end	Day	25% 19% 39% 17% 1	297
February	1st to 10th	Day	22% 30% 32% 11% 3 1	270
	11th to 20th	Day	22% 33% 33% 11% 1	270
	21st to end	Day	25% 35% 34% 6%	225
March	1st to 10th	Day	24% 29% 36% 10% 1	270
	11th to 20th	Day	23% 20% 37% 14% 6% 1	374
	21st to end	Day	28% 21% 28% 18% 5% 1	506
April	1st to 10th	Day	27% 21% 33% 14% 4 1	460
	11th to 20th	Day	28% 19% 30% 14% 7% 2	452
	21st to end	Day	20% 21% 31% 20% 6% 2	460
May	1st to 10th	Day	21% 19% 36% 17% 6% 1	463
	11th to 20th	Day	15% 13% 38% 25% 7% 2	608
	21st to end	Day	14% 11% 34% 28% 10% 2	734
June	1st to 10th	Day	14% 14% 35% 26% 9% 2	680
	11th to 20th	Day	14% 12% 37% 27% 8% 2	680
	21st to end	Day	18% 10% 31% 30% 10% 2	680
July	1st to 10th	Day	10% 8% 31% 35% 12% 4	671
	11th to 20th	Day	9% 10% 31% 33% 14% 3	668
	21st to end	Day	8% 6% 35% 35% 13% 4	739
August	1st to 10th	Day	10% 7% 28% 33% 17% 5%	607
	11th to 20th	Day	13% 8% 23% 33% 15% 8%	479
	21st to end	Day	17% 10% 28% 28% 16% 3	539
September	1st to 10th	Day	20% 10% 27% 26% 12% 5%	490
	11th to 20th	Day	11% 8% 27% 33% 18% 3	490
	21st to end	Day	17% 14% 24% 29% 13% 4	490
October	1st to 10th	Day	19% 18% 30% 21% 11% 1	490
	11th to 20th	Day	32% 18% 32% 15% 2	336
	21st to end	Day	37% 21% 30% 10% 2	330
November	1st to 10th	Day	31% 20% 28% 18% 3	300
	11th to 20th	Day	29% 25% 36% 8% 2	300
	21st to end	Day	29% 28% 30% 11% 2	299
December	1st to 10th	Day	31% 30% 25% 12% 3	230
	11th to 20th	Day	25% 32% 32% 7% 3	247
	21st to end	Day	30% 32% 28% 9% 1 1	297
January	1st to 10th	Night	23% 23% 33% 17% 4	950
	11th to 20th	Night	26% 23% 31% 16% 4	950
	21st to end	Night	23% 17% 33% 22% 5% 1	1045
February	1st to 10th	Night	20% 22% 32% 20% 5% 1	879
	11th to 20th	Night	21% 23% 31% 21% 4	743
	21st to end	Night	26% 22% 31% 18% 3	628
March	1st to 10th	Night	19% 16% 34% 23% 5% 1	760
	11th to 20th	Night	18% 19% 35% 22% 5% 1	760
	21st to end	Night	22% 14% 32% 24% 6% 1	731
April	1st to 10th	Night	23% 16% 32% 23% 5% 1	570
	11th to 20th	Night	25% 14% 30% 23% 7% 1	563
	21st to end	Night	21% 10% 32% 26% 9% 1	570
May	1st to 10th	Night	20% 9% 30% 32% 8% 1	570
	11th to 20th	Night	18% 9% 35% 29% 9% 1	561
	21st to end	Night	14% 9% 26% 35% 16% 1	617
June	1st to 10th	Night	15% 6% 29% 35% 13% 1	570
	11th to 20th	Night	14% 8% 25% 38% 13% 2	570
	21st to end	Night	13% 4 28% 38% 16% 1	570
July	1st to 10th	Night	11% 4 22% 39% 21% 2	555
	11th to 20th	Night	10% 4 25% 34% 25% 2	552
	21st to end	Night	10% 4 25% 36% 23% 2	624
August	1st to 10th	Night	11% 3 20% 38% 26% 1	567
	11th to 20th	Night	10% 7% 20% 34% 26% 4	564
	21st to end	Night	15% 5% 23% 38% 16% 2	627
September	1st to 10th	Night	15% 7% 25% 31% 19% 4	570
	11th to 20th	Night	15% 6% 24% 31% 20% 3	740
	21st to end	Night	21% 9% 22% 29% 17% 3	760
October	1st to 10th	Night	24% 12% 24% 26% 13% 1	760
	11th to 20th	Night	33% 14% 26% 21% 6%	760
	21st to end	Night	34% 16% 24% 20% 5% 1	836
November	1st to 10th	Night	31% 14% 32% 19% 3	780
	11th to 20th	Night	29% 23% 29% 17% 2	800
	21st to end	Night	30% 21% 30% 17% 3	880
December	1st to 10th	Night	30% 24% 29% 14% 3	950
	11th to 20th	Night	27% 24% 29% 15% 3 1	950
	21st to end	Night	30% 21% 32% 15% 1	1045

Page generated at 2024-11-27 17:30:49. Version ac07

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